constant-expression-cxx11.cpp revision 16581335fc32abcbc6ab14eda7af38cf759664b7
1b0ddf227b25388ad836e560c00f0aec84026b0e5Alexey Samsonov// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 -pedantic %s -Wno-comment 21e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 31e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace StaticAssertFoldTest { 41e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 51e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyint x; 61e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(++x, "test"); // expected-error {{not an integral constant expression}} 71e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(false, "test"); // expected-error {{test}} 81e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 91e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanytypedef decltype(sizeof(char)) size_t; 121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanytemplate<typename T> constexpr T id(const T &t) { return t; } 141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanytemplate<typename T> constexpr T min(const T &a, const T &b) { 15938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov return a < b ? a : b; 161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 17938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanovtemplate<typename T> constexpr T max(const T &a, const T &b) { 181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return a < b ? b : a; 19938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov} 201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanytemplate<typename T, size_t N> constexpr T *begin(T (&xs)[N]) { return xs; } 21938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanovtemplate<typename T, size_t N> constexpr T *end(T (&xs)[N]) { return xs + N; } 221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 23938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanovstruct MemberZero { 241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int zero() { return 0; } 25938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov}; 261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace DerivedToVBaseCast { 281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 29938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov struct U { int n; }; 301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct V : U { int n; }; 31938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov struct A : virtual V { int n; }; 321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct Aa { int n; }; 33938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov struct B : virtual A, Aa {}; 341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct C : virtual A, Aa {}; 35938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov struct D : B, C {}; 361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 37938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov D d; 381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr B *p = &d; 39938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov constexpr C *q = &d; 401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((void*)p != (void*)q, ""); 421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((A*)p == (A*)q, ""); 431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((Aa*)p != (Aa*)q, ""); 44938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov 45938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov constexpr B &pp = d; 46938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov constexpr C &qq = d; 471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((void*)&pp != (void*)&qq, ""); 481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(&(A&)pp == &(A&)qq, ""); 492dcf44991a8ec1ca7c8051eb27c5ff158530bdc3Timur Iskhodzhanov static_assert(&(Aa&)pp != &(Aa&)qq, ""); 50938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov 511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr V *v = p; 521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr V *w = q; 531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr V *x = (A*)p; 541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(v == w, ""); 551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(v == x, ""); 561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((U*)&d == p, ""); 581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((U*)&d == q, ""); 591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((U*)&d == v, ""); 6013ebae606b526399771e9cca1d6a9d24458ad0f1Kostya Serebryany static_assert((U*)&d == w, ""); 6113ebae606b526399771e9cca1d6a9d24458ad0f1Kostya Serebryany static_assert((U*)&d == x, ""); 6213ebae606b526399771e9cca1d6a9d24458ad0f1Kostya Serebryany 63badab16503e025326a46a45da8faa6fd20e5fc3dKostya Serebryany struct X {}; 64badab16503e025326a46a45da8faa6fd20e5fc3dKostya Serebryany struct Y1 : virtual X {}; 6513ebae606b526399771e9cca1d6a9d24458ad0f1Kostya Serebryany struct Y2 : X {}; 6613ebae606b526399771e9cca1d6a9d24458ad0f1Kostya Serebryany struct Z : Y1, Y2 {}; 6713ebae606b526399771e9cca1d6a9d24458ad0f1Kostya Serebryany Z z; 6813ebae606b526399771e9cca1d6a9d24458ad0f1Kostya Serebryany static_assert((X*)(Y1*)&z != (X*)(Y2*)&z, ""); 691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace ConstCast { 721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 731e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int n1 = 0; 741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int n2 = const_cast<int&>(n1); 751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int *n3 = const_cast<int*>(&n1); 761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int n4 = *const_cast<int*>(&n1); 771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr const int * const *n5 = const_cast<const int* const*>(&n3); 781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int **n6 = const_cast<int**>(&n3); 791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int n7 = **n5; 801e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int n8 = **n6; 811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace TemplateArgumentConversion { 851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany template<int n> struct IntParam {}; 861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany using IntParam0 = IntParam<0>; 881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany using IntParam0 = IntParam<id(0)>; 891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany using IntParam0 = IntParam<MemberZero().zero>; // expected-error {{did you mean to call it with no arguments?}} 901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace CaseStatements { 93e0e9eea99d7a81a15c4bb15ff2e5ebd92b50817bEvgeniy Stepanov void f(int n) { 941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany switch (n) { 951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany case MemberZero().zero: // expected-error {{did you mean to call it with no arguments?}} expected-note {{previous}} 961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany case id(0): // expected-error {{duplicate case value '0'}} 971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return; 987274eafceb832e1088f30b71652992787ba8c456Evgeniy Stepanov } 991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 1004dd8ba8238b1b698953628affe6e5b2edf3b3e3fAlexey Samsonov} 1011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 10276e842845c927e92c2c21c41ac51e364fa17528cAlexey Samsonovextern int &Recurse1; 1031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyint &Recurse2 = Recurse1; // expected-note {{declared here}} 1041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyint &Recurse1 = Recurse2; 1051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int &Recurse3 = Recurse2; // expected-error {{must be initialized by a constant expression}} expected-note {{initializer of 'Recurse2' is not a constant expression}} 1061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern const int RecurseA; 1081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int RecurseB = RecurseA; // expected-note {{declared here}} 1091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int RecurseA = 10; 1101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int RecurseC = RecurseB; // expected-error {{must be initialized by a constant expression}} expected-note {{initializer of 'RecurseB' is not a constant expression}} 1111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace MemberEnum { 1131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct WithMemberEnum { 1141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany enum E { A = 42 }; 1151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } wme; 11676e842845c927e92c2c21c41ac51e364fa17528cAlexey Samsonov 1171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(wme.A == 42, ""); 1181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace DefaultArguments { 1211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int z = int(); 12376e842845c927e92c2c21c41ac51e364fa17528cAlexey Samsonovconstexpr int Sum(int a = 0, const int &b = 0, const int *c = &z, char d = 0) { 1241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return a + b + *c + d; 1251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst int four = 4; 1271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int eight = 8; 12876e842845c927e92c2c21c41ac51e364fa17528cAlexey Samsonovconstexpr const int twentyseven = 27; 1291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(Sum() == 0, ""); 1301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(Sum(1) == 1, ""); 1311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(Sum(1, four) == 5, ""); 1321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(Sum(1, eight, &twentyseven) == 36, ""); 1331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(Sum(1, 2, &four, eight) == 15, ""); 1341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace Ellipsis { 1381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Note, values passed through an ellipsis can't actually be used. 1401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int F(int a, ...) { return a; } 1411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(F(0) == 0, ""); 1421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(F(1, 0) == 1, ""); 1431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(F(2, "test") == 2, ""); 1442697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryanystatic_assert(F(3, &F) == 3, ""); 1452697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryanyint k = 0; // expected-note {{here}} 1461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(F(4, k) == 3, ""); // expected-error {{constant expression}} expected-note {{read of non-const variable 'k'}} 1471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace Recursion { 1511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int fib(int n) { return n > 1 ? fib(n-1) + fib(n-2) : n; } 1521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(fib(11) == 89, ""); 1531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int gcd_inner(int a, int b) { 1551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return b == 0 ? a : gcd_inner(b, a % b); 1561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 1571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int gcd(int a, int b) { 1581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return gcd_inner(max(a, b), min(a, b)); 1592697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany } 1602697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany 1611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(gcd(1749237, 5628959) == 7, ""); 1621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace FunctionCast { 165ca9b5dd9922fb7f6e0ca06dbba7db7398b8997f1Kostya Serebryany // When folding, we allow functions to be cast to different types. Such 1661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // cast functions cannot be called, even if they're constexpr. 1671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int f() { return 1; } 1681e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany typedef double (*DoubleFn)(); 1691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany typedef int (*IntFn)(); 1701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int a[(int)DoubleFn(f)()]; // expected-error {{variable length array}} expected-warning{{C99 feature}} 1711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int b[(int)IntFn(f)()]; // ok 1721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 173366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany 1747f4df1a0e1e1b2ace94d4d78b03c222887dbb00cKostya Serebryanynamespace StaticMemberFunction { 175366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany struct S { 176f931da85ce8668751628ded926ecad013c5d6f1aKostya Serebryany static constexpr int k = 42; 177f931da85ce8668751628ded926ecad013c5d6f1aKostya Serebryany static constexpr int f(int n) { return n * k + 2; } 178366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany } s; 179366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany 180366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany constexpr int n = s.f(19); 181366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany static_assert(S::f(19) == 800, ""); 182366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany static_assert(s.f(19) == 800, ""); 183366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany static_assert(n == 800, ""); 184366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany 185366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany constexpr int (*sf1)(int) = &S::f; 186366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany constexpr int (*sf2)(int) = &s.f; 187366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany constexpr const int *sk = &s.k; 188366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany} 189366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany 190366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryanynamespace ParameterScopes { 191366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany 192366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany const int k = 42; 193366984e3aa286f7b4fb45f5c9e703f2768c407edKostya Serebryany constexpr const int &ObscureTheTruth(const int &a) { return a; } 1941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr const int &MaybeReturnJunk(bool b, const int a) { // expected-note 2{{declared here}} 1951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return ObscureTheTruth(b ? a : k); 1961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 1971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(MaybeReturnJunk(false, 0) == 42, ""); // ok 1981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int a = MaybeReturnJunk(true, 0); // expected-error {{constant expression}} expected-note {{read of variable whose lifetime has ended}} 1991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr const int MaybeReturnNonstaticRef(bool b, const int a) { 2011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return ObscureTheTruth(b ? a : k); 2021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 2031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(MaybeReturnNonstaticRef(false, 0) == 42, ""); // ok 2041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int b = MaybeReturnNonstaticRef(true, 0); // ok 2051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int InternalReturnJunk(int n) { 2071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return MaybeReturnJunk(true, n); // expected-note {{read of variable whose lifetime has ended}} 2081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 2091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int n3 = InternalReturnJunk(0); // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'InternalReturnJunk(0)'}} 2101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int LToR(int &n) { return n; } 2121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int GrabCallersArgument(bool which, int a, int b) { 2131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return LToR(which ? b : a); 2141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 2151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(GrabCallersArgument(false, 1, 2) == 1, ""); 21676e842845c927e92c2c21c41ac51e364fa17528cAlexey Samsonov static_assert(GrabCallersArgument(true, 4, 8) == 8, ""); 2171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 2191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace Pointers { 2211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int f(int n, const int *a, const int *b, const int *c) { 2231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return n == 0 ? 0 : *a + f(n-1, b, c, a); 2241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 2251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany const int x = 1, y = 10, z = 100; 2271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(f(23, &x, &y, &z) == 788, ""); 2281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int g(int n, int a, int b, int c) { 2301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return f(n, &a, &b, &c); 2315af39e50366f1aacbebc284f572f08ad1ad07357Kostya Serebryany } 2321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(g(23, x, y, z) == 788, ""); 2331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 2351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace FunctionPointers { 2371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int Double(int n) { return 2 * n; } 2391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int Triple(int n) { return 3 * n; } 2401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int Twice(int (*F)(int), int n) { return F(F(n)); } 24158b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko constexpr int Quadruple(int n) { return Twice(Double, n); } 24258b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko constexpr auto Select(int n) -> int (*)(int) { 243ca9b5dd9922fb7f6e0ca06dbba7db7398b8997f1Kostya Serebryany return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0; 24458b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko } 24558b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko constexpr int Apply(int (*F)(int), int n) { return F(n); } // expected-note {{subexpression}} 2461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, ""); 24858b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko 24958b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko constexpr int Invalid = Apply(Select(0), 0); // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'Apply(0, 0)'}} 25058b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko 25158b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko} 25258b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko 25358b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkonamespace PointerComparison { 25458b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko 25558b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoint x, y; 256b0ddf227b25388ad836e560c00f0aec84026b0e5Alexey Samsonovstatic_assert(&x == &y, "false"); // expected-error {{false}} 25758b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(&x != &y, ""); 25858b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoconstexpr bool g1 = &x == &y; 25958b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoconstexpr bool g2 = &x != &y; 26058b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoconstexpr bool g3 = &x <= &y; // expected-error {{must be initialized by a constant expression}} 26158b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoconstexpr bool g4 = &x >= &y; // expected-error {{must be initialized by a constant expression}} 26258b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoconstexpr bool g5 = &x < &y; // expected-error {{must be initialized by a constant expression}} 26358b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoconstexpr bool g6 = &x > &y; // expected-error {{must be initialized by a constant expression}} 26458b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko 26558b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostruct S { int x, y; } s; 26658b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(&s.x == &s.y, "false"); // expected-error {{false}} 26758b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(&s.x != &s.y, ""); 26858b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(&s.x <= &s.y, ""); 26958b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(&s.x >= &s.y, "false"); // expected-error {{false}} 27058b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(&s.x < &s.y, ""); 27158b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(&s.x > &s.y, "false"); // expected-error {{false}} 27258b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenko 27358b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(0 == &y, "false"); // expected-error {{false}} 27458b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkostatic_assert(0 != &y, ""); 27558b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoconstexpr bool n3 = 0 <= &y; // expected-error {{must be initialized by a constant expression}} 27658b017bb286a8f4413a9348d2c87c52de38cff6dAlexander Potapenkoconstexpr bool n4 = 0 >= &y; // expected-error {{must be initialized by a constant expression}} 277b0ddf227b25388ad836e560c00f0aec84026b0e5Alexey Samsonovconstexpr bool n5 = 0 < &y; // expected-error {{must be initialized by a constant expression}} 2781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool n6 = 0 > &y; // expected-error {{must be initialized by a constant expression}} 2791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2801e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(&x == 0, "false"); // expected-error {{false}} 2811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(&x != 0, ""); 2821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool n9 = &x <= 0; // expected-error {{must be initialized by a constant expression}} 2831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool n10 = &x >= 0; // expected-error {{must be initialized by a constant expression}} 2841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool n11 = &x < 0; // expected-error {{must be initialized by a constant expression}} 2851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool n12 = &x > 0; // expected-error {{must be initialized by a constant expression}} 2861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 28700545a3625aaa765eef2da9b3e197a0e00e94550Evgeniy Stepanovstatic_assert(&x == &x, ""); 28800545a3625aaa765eef2da9b3e197a0e00e94550Evgeniy Stepanovstatic_assert(&x != &x, "false"); // expected-error {{false}} 2891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(&x <= &x, ""); 2901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(&x >= &x, ""); 2911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(&x < &x, "false"); // expected-error {{false}} 2921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(&x > &x, "false"); // expected-error {{false}} 2931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 294d39a34ee33aae73fdde065f784bdc19f67b91ae2Kostya Serebryanyconstexpr S* sptr = &s; 295d39a34ee33aae73fdde065f784bdc19f67b91ae2Kostya Serebryanyconstexpr bool dyncast = sptr == dynamic_cast<S*>(sptr); // expected-error {{constant expression}} expected-note {{dynamic_cast}} 2961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 2971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct U {}; 2981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct Str { 299c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany int a : dynamic_cast<S*>(sptr) == dynamic_cast<S*>(sptr); // \ 300c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-warning {{not an integral constant expression}} \ 301c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-note {{dynamic_cast is not allowed in a constant expression}} 302c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany int b : reinterpret_cast<S*>(sptr) == reinterpret_cast<S*>(sptr); // \ 303c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-warning {{not an integral constant expression}} \ 304c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-note {{reinterpret_cast is not allowed in a constant expression}} 305c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany int c : (S*)(long)(sptr) == (S*)(long)(sptr); // \ 306c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-warning {{not an integral constant expression}} \ 307c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 308c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany int d : (S*)(42) == (S*)(42); // \ 309c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-warning {{not an integral constant expression}} \ 310c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 311c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany int e : (Str*)(sptr) == (Str*)(sptr); // \ 312c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-warning {{not an integral constant expression}} \ 313c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 314c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany int f : &(U&)(*sptr) == &(U&)(*sptr); // \ 315c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-warning {{not an integral constant expression}} \ 316c311105fd64219bb96b6467c3707ebda355be87bKostya Serebryany expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 3171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int g : (S*)(void*)(sptr) == sptr; // \ 3181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany expected-warning {{not an integral constant expression}} \ 3191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany expected-note {{cast from 'void *' is not allowed in a constant expression}} 3201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 3211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern char externalvar[]; 3231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool constaddress = (void *)externalvar == (void *)0x4000UL; // expected-error {{must be initialized by a constant expression}} 3241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}} expected-warning {{unspecified}} 3251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(0 != "foo", ""); 3261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3272697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany} 3282697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany 3291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace MaterializeTemporary { 3301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3312697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryanyconstexpr int f(const int &r) { return r; } 3321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int n = f(1); 3331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3342697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryanyconstexpr bool same(const int &a, const int &b) { return &a == &b; } 3351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool sameTemporary(const int &n) { return same(n, n); } 3361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(n, ""); 3381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(!same(4, 4), ""); 3391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(same(n, n), ""); 3401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(sameTemporary(9), ""); 3411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 3431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 34448ddbef1d051875b2d0b204e8d78300b58d80a85Evgeniy Stepanovconstexpr int strcmp_ce(const char *p, const char *q) { 3451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1); 3461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 347a3ab1a7da70a5ef111257ba8887920c1fdcd7be5Alexey Samsonov 348a3ab1a7da70a5ef111257ba8887920c1fdcd7be5Alexey Samsonovnamespace StringLiteral { 349a3ab1a7da70a5ef111257ba8887920c1fdcd7be5Alexey Samsonov 350a3ab1a7da70a5ef111257ba8887920c1fdcd7be5Alexey Samsonovtemplate<typename Char> 351a3ab1a7da70a5ef111257ba8887920c1fdcd7be5Alexey Samsonovconstexpr int MangleChars(const Char *p) { 352a3ab1a7da70a5ef111257ba8887920c1fdcd7be5Alexey Samsonov return *p + 3 * (*p ? MangleChars(p+1) : 0); 353a3ab1a7da70a5ef111257ba8887920c1fdcd7be5Alexey Samsonov} 3541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(MangleChars("constexpr!") == 1768383, ""); 356d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovstatic_assert(MangleChars(u8"constexpr!") == 1768383, ""); 357d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovstatic_assert(MangleChars(L"constexpr!") == 1768383, ""); 358d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovstatic_assert(MangleChars(u"constexpr!") == 1768383, ""); 359a180078ee0120c049f9fb495f930053f80f105aaAlexey Samsonovstatic_assert(MangleChars(U"constexpr!") == 1768383, ""); 360d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonov 361d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovconstexpr char c0 = "nought index"[0]; 362d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovconstexpr char c1 = "nice index"[10]; 363d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovconstexpr char c2 = "nasty index"[12]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is past the end}} expected-note {{read of dereferenced one-past-the-end pointer}} 364a180078ee0120c049f9fb495f930053f80f105aaAlexey Samsonovconstexpr char c3 = "negative index"[-1]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is before the beginning}} expected-note {{cannot refer to element -1 of array of 15 elements}} 365d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovconstexpr char c4 = ((char*)(int*)"no reinterpret_casts allowed")[14]; // expected-error {{must be initialized by a constant expression}} expected-note {{cast which performs the conversions of a reinterpret_cast}} 366d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonov 367a180078ee0120c049f9fb495f930053f80f105aaAlexey Samsonovconstexpr const char *p = "test" + 2; 368d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovstatic_assert(*p == 's', ""); 369a180078ee0120c049f9fb495f930053f80f105aaAlexey Samsonov 370a180078ee0120c049f9fb495f930053f80f105aaAlexey Samsonovconstexpr const char *max_iter(const char *a, const char *b) { 371a180078ee0120c049f9fb495f930053f80f105aaAlexey Samsonov return *a < *b ? b : a; 372d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonov} 373d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonovconstexpr const char *max_element(const char *a, const char *b) { 374d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonov return (a+1 >= b) ? a : max_iter(a, max_element(a+1, b)); 375d91699339fd7e022aef0eaa8f401af0f8942068bAlexey Samsonov} 3764fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov 3774fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonovconstexpr char str[] = "the quick brown fox jumped over the lazy dog"; 378ca9b5dd9922fb7f6e0ca06dbba7db7398b8997f1Kostya Serebryanyconstexpr const char *max = max_element(begin(str), end(str)); 3794fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonovstatic_assert(*max == 'z', ""); 3804fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonovstatic_assert(max == str + 38, ""); 3814fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov 3824fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonovstatic_assert(strcmp_ce("hello world", "hello world") == 0, ""); 3834fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonovstatic_assert(strcmp_ce("hello world", "hello clang") > 0, ""); 38476e842845c927e92c2c21c41ac51e364fa17528cAlexey Samsonovstatic_assert(strcmp_ce("constexpr", "test") < 0, ""); 3854fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonovstatic_assert(strcmp_ce("", " ") < 0, ""); 3864fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov 3874fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonovstruct S { 3884fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov int n : "foo"[4]; // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer is not allowed in a constant expression}} 3894fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov}; 3904fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov 3914fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonovstruct T { 3924fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov char c[6]; 3934fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov constexpr T() : c{"foo"} {} 3944fd95f141f78906570c15a8a3b4cf0a7b50a201dAlexey Samsonov}; 3951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr T t; 3961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 3971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(t.c[0] == 'f', ""); 3981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(t.c[1] == 'o', ""); 3991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(t.c[2] == 'o', ""); 4001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(t.c[3] == 0, ""); 4011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(t.c[4] == 0, ""); 4021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(t.c[5] == 0, ""); 4037dd282c0c7d3ca32ee94092289bd802e16fe9867Alexey Samsonovstatic_assert(t.c[6] == 0, ""); // expected-error {{constant expression}} expected-note {{one-past-the-end}} 4047dd282c0c7d3ca32ee94092289bd802e16fe9867Alexey Samsonov 4057dd282c0c7d3ca32ee94092289bd802e16fe9867Alexey Samsonovstruct U { 4067dd282c0c7d3ca32ee94092289bd802e16fe9867Alexey Samsonov wchar_t chars[6]; 4071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int n; 4081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} constexpr u = { { L"test" }, 0 }; 4091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(u.chars[2] == L's', ""); 4101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct V { 4121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany char c[4]; 4131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr V() : c("hi!") {} 4141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 4151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(V().c[1] == "i"[0], ""); 4161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 41927f4932a8a0845303b33d69ddce096c445002e60Kostya Serebryanynamespace Array { 420ca9b5dd9922fb7f6e0ca06dbba7db7398b8997f1Kostya Serebryany 42127f4932a8a0845303b33d69ddce096c445002e60Kostya Serebryanytemplate<typename Iter> 42227f4932a8a0845303b33d69ddce096c445002e60Kostya Serebryanyconstexpr auto Sum(Iter begin, Iter end) -> decltype(+*begin) { 42327f4932a8a0845303b33d69ddce096c445002e60Kostya Serebryany return begin == end ? 0 : *begin + Sum(begin+1, end); 4241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int xs[] = { 1, 2, 3, 4, 5 }; 427938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanovconstexpr int ys[] = { 5, 4, 3, 2, 1 }; 4281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int sum_xs = Sum(begin(xs), end(xs)); 4291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(sum_xs == 15, ""); 4301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int ZipFoldR(int (*F)(int x, int y, int c), int n, 4321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany const int *xs, const int *ys, int c) { 4331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return n ? F( 4341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany *xs, // expected-note {{read of dereferenced one-past-the-end pointer}} 4351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany *ys, 4361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany ZipFoldR(F, n-1, xs+1, ys+1, c)) // \ 4371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany expected-note {{in call to 'ZipFoldR(&SubMul, 2, &xs[4], &ys[4], 1)'}} \ 4381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany expected-note {{in call to 'ZipFoldR(&SubMul, 1, &xs[5], &ys[5], 1)'}} 4391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany : c; 4401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int MulAdd(int x, int y, int c) { return x * y + c; } 4421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int InnerProduct = ZipFoldR(MulAdd, 5, xs, ys, 0); 4431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(InnerProduct == 35, ""); 4441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int SubMul(int x, int y, int c) { return (x - y) * c; } 4461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int DiffProd = ZipFoldR(SubMul, 2, xs+3, ys+3, 1); 4471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(DiffProd == 8, ""); 4481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(ZipFoldR(SubMul, 3, xs+3, ys+3, 1), ""); // \ 4491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany expected-error {{constant expression}} \ 4501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany expected-note {{in call to 'ZipFoldR(&SubMul, 3, &xs[3], &ys[3], 1)'}} 4511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr const int *p = xs + 3; 4531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int xs4 = p[1]; // ok 4541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int xs5 = p[2]; // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 4551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int xs6 = p[3]; // expected-error {{constant expression}} expected-note {{cannot refer to element 6}} 4561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int xs0 = p[-3]; // ok 4571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int xs_1 = p[-4]; // expected-error {{constant expression}} expected-note {{cannot refer to element -1}} 4581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int zs[2][2][2][2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 4601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(zs[0][0][0][0] == 1, ""); 4611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(zs[1][1][1][1] == 16, ""); 4621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 4631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert((&zs[0][0][0][2])[-1] == 2, ""); 4641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(**(**(zs + 1) + 1) == 11, ""); 4651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, ""); // expected-error {{constant expression}} expected-note {{cannot refer to element -1 of array of 2 elements in a constant expression}} 4661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][2] - 2) == 11, ""); 4671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int err_zs_1_2_0_0 = zs[1][2][0][0]; // expected-error {{constant expression}} expected-note {{cannot access array element of pointer past the end}} 46850f3daa00d3da0a80c8798a3e977705e96ec106fKostya Serebryany 46950f3daa00d3da0a80c8798a3e977705e96ec106fKostya Serebryanyconstexpr int fail(const int &p) { 47050f3daa00d3da0a80c8798a3e977705e96ec106fKostya Serebryany return (&p)[64]; // expected-note {{cannot refer to element 64 of array of 2 elements}} 471938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov} 4721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(fail(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][2] - 2)) == 11, ""); // \ 4731e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyexpected-error {{static_assert expression is not an integral constant expression}} \ 4741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyexpected-note {{in call to 'fail(zs[1][0][1][0])'}} 4751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int arr[40] = { 1, 2, 3, [8] = 4 }; // expected-warning {{C99 feature}} 4771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int SumNonzero(const int *p) { 4781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return *p + (*p ? SumNonzero(p+1) : 0); 4791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4801e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int CountZero(const int *p, const int *q) { 481938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov return p == q ? 0 : (*p == 0) + CountZero(p+1, q); 4821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(SumNonzero(arr) == 6, ""); 4841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(CountZero(arr, arr + 40) == 36, ""); 485938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov 4861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct ArrayElem { 4871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr ArrayElem() : n(0) {} 4881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int n; 489938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov constexpr int f() { return n; } 4901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 4911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct ArrayRVal { 4921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr ArrayRVal() {} 4931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany ArrayElem elems[10]; 4941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 4951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(ArrayRVal().elems[3].f() == 0, ""); 4961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace DependentValues { 5001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct I { int n; typedef I V[10]; }; 5021e172b4bdec57329bf904f063a29f99cddf2d85fKostya SerebryanyI::V x, y; 5031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanytemplate<bool B> struct S { 5041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int k; 5051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany void f() { 50650f3daa00d3da0a80c8798a3e977705e96ec106fKostya Serebryany I::V &cells = B ? x : y; 5071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany I &i = cells[k]; 508938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov switch (i.n) {} 5091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 5101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 5111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace Class { 5151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct A { constexpr A(int a, int b) : k(a + b) {} int k; }; 5171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int fn(const A &a) { return a.k; } 5181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(fn(A(4,5)) == 9, ""); 519d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany 520d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryanystruct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}} 521d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryanystruct C { 522d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany constexpr C(C *this_) : m(42), n(this_->m) {} // ok 523d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany int m, n; 524d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany}; 525d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryanystruct D { 526d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany C c; 527d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany constexpr D() : c(&c) {} 528d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany}; 529d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryanystatic_assert(D().c.n == 42, ""); 530938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov 5311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct E { 5321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr E() : p(&p) {} 5331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany void *p; 5341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 5351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr const E &e1 = E(); // expected-error {{constant expression}} expected-note {{reference to temporary is not a constant expression}} expected-note {{temporary created here}} 5361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// This is a constant expression if we elide the copy constructor call, and 5371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// is not a constant expression if we don't! But we do, so it is. 5381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr E e2 = E(); 5391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(e2.p == &e2.p, ""); 5401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr E e3; 541938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanovstatic_assert(e3.p == &e3.p, ""); 5421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern const class F f; 5441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct F { 5451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr F() : p(&f.p) {} 5461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany const void *p; 5471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 5481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr F f; 5491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct G { 5511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct T { 5521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr T(T *p) : u1(), u2(p) {} 553938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov union U1 { 5541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr U1() {} 5551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int a, b = 42; 5561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } u1; 5571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany union U2 { 5581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr U2(T *p) : c(p->u1.b) {} 5591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int c, d; 5601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } u2; 5611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } t; 5621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr G() : t(&t) {} 5631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} constexpr g; 5641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(g.t.u1.a == 42, ""); // expected-error {{constant expression}} expected-note {{read of member 'a' of union with active member 'b'}} 5661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(g.t.u1.b == 42, ""); 5671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(g.t.u2.c == 42, ""); 5681e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(g.t.u2.d == 42, ""); // expected-error {{constant expression}} expected-note {{read of member 'd' of union with active member 'c'}} 5691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5700bdc46c7ee03e8c4e4da7c5ac43edac237aa53e2Kostya Serebryanystruct S { 5710bdc46c7ee03e8c4e4da7c5ac43edac237aa53e2Kostya Serebryany int a, b; 5720bdc46c7ee03e8c4e4da7c5ac43edac237aa53e2Kostya Serebryany const S *p; 5730bdc46c7ee03e8c4e4da7c5ac43edac237aa53e2Kostya Serebryany double d; 574c3a5c173f228cbb15e332e6bbc17c76ebd55d7a8Kostya Serebryany const char *q; 575d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany 576c3a5c173f228cbb15e332e6bbc17c76ebd55d7a8Kostya Serebryany constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {} 577d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany}; 578d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany 579d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya SerebryanyS global(43, &global); 580d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryany 581d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryanystatic_assert(S(15, &global).b == 15, ""); 582b989143d0be56496e8d5fcf75969af35a058792aKostya Serebryany 583d3ca78fdb296d2a51fc224da673ebfff508acf44Kostya Serebryanyconstexpr bool CheckS(const S &s) { 5841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l'; 5851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(CheckS(S(27, &global)), ""); 5871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct Arr { 5891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany char arr[3]; 5901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Arr() : arr{'x', 'y', 'z'} {} 5911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 5921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int hash(Arr &&a) { 5931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000; 5941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int k = hash(Arr()); 5961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(k == 0x007a7978, ""); 5971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct AggregateInit { 6001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany const char &c; 6011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int n; 6021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany double d; 603938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov int arr[5]; 6041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany void *p; 6051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 6061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr AggregateInit agg1 = { "hello"[0] }; 6081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(strcmp_ce(&agg1.c, "hello") == 0, ""); 6101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(agg1.n == 0, ""); 6111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(agg1.d == 0.0, ""); 6121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}} expected-note {{cannot refer to element -1}} 6131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(agg1.arr[0] == 0, ""); 6141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(agg1.arr[4] == 0, ""); 6151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(agg1.arr[5] == 0, ""); // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end}} 6161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(agg1.p == nullptr, ""); 6175af39e50366f1aacbebc284f572f08ad1ad07357Kostya Serebryany 6181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace SimpleDerivedClass { 6191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct B { 6211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr B(int n) : a(n) {} 6221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int a; 6231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 6241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct D : B { 6251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr D(int n) : B(n) {} 6261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 6271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr D d(3); 6281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(d.a == 3, ""); 6291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 6311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct Bottom { constexpr Bottom() {} }; 6331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct Base : Bottom { 6341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {} 6351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int a; 6361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany const char *b; 6371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 6381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct Base2 : Bottom { 6391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base2(const int &r) : r(r) {} 6401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int q = 123; 6411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany const int &r; 6421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 6431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct Derived : Base, Base2 { 6442697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany constexpr Derived() : Base(76), Base2(a) {} 6452697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany int c = r + b[1]; 6462697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany}; 6472697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany 6481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool operator==(const Base &a, const Base &b) { 6491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return a.a == b.a && strcmp_ce(a.b, b.b) == 0; 650f6607d097833cd53460735c1a5a2fd52b97613ebTimur Iskhodzhanov} 6511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Base base; 6531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Base base2(76); 6541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Derived derived; 6551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(derived.a == 76, ""); 6561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(derived.b[2] == 's', ""); 6571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(derived.c == 76 + 'e', ""); 6581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(derived.q == 123, ""); 659ca9b5dd9922fb7f6e0ca06dbba7db7398b8997f1Kostya Serebryanystatic_assert(derived.r == 76, ""); 660acd5c617b219e0f059620c2a3928d2cc821d4534Kostya Serebryanystatic_assert(&derived.r == &derived.a, ""); 6611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(!(derived == base), ""); 6631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(derived == base2, ""); 6641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Bottom &bot1 = (Base&)derived; 6661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Bottom &bot2 = (Base2&)derived; 6671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(&bot1 != &bot2, ""); 6686cbfae439b81221d2250ffe0331958f130259755Kostya Serebryany 6691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Bottom *pb1 = (Base*)&derived; 6701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Bottom *pb2 = (Base2*)&derived; 6711b057b20db71ec6cc2bac460c8b2848f0889d47dKostya Serebryanystatic_assert(&pb1 != &pb2, ""); 6721b057b20db71ec6cc2bac460c8b2848f0889d47dKostya Serebryanystatic_assert(pb1 == &bot1, ""); 673ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenkostatic_assert(pb2 == &bot2, ""); 6741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Base2 &fail = (Base2&)bot1; // expected-error {{constant expression}} expected-note {{cannot cast object of dynamic type 'const Class::Derived' to type 'Class::Base2'}} 6761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Base &fail2 = (Base&)*pb2; // expected-error {{constant expression}} expected-note {{cannot cast object of dynamic type 'const Class::Derived' to type 'Class::Base'}} 6776cbfae439b81221d2250ffe0331958f130259755Kostya Serebryanyconstexpr Base2 &ok2 = (Base2&)bot2; 678ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenkostatic_assert(&ok2 == &derived, ""); 679ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenko 680ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenkoconstexpr Base2 *pfail = (Base2*)pb1; // expected-error {{constant expression}} expected-note {{cannot cast object of dynamic type 'const Class::Derived' to type 'Class::Base2'}} 6816cbfae439b81221d2250ffe0331958f130259755Kostya Serebryanyconstexpr Base *pfail2 = (Base*)&bot2; // expected-error {{constant expression}} expected-note {{cannot cast object of dynamic type 'const Class::Derived' to type 'Class::Base'}} 682ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenkoconstexpr Base2 *pok2 = (Base2*)pb2; 683ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenkostatic_assert(pok2 == &derived, ""); 684ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenkostatic_assert(&ok2 == pok2, ""); 6856cbfae439b81221d2250ffe0331958f130259755Kostya Serebryanystatic_assert((Base2*)(Derived*)(Base*)pb1 == pok2, ""); 6861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert((Derived*)(Base*)pb1 == (Derived*)pok2, ""); 6871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6880b770b48e4ae053a7d0610e1c682405afba58fdaKostya Serebryanyconstexpr Base *nullB = 42 - 6 * 7; 689ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenkostatic_assert((Bottom*)nullB == 0, ""); 6901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert((Derived*)nullB == 0, ""); 6911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert((void*)(Bottom*)nullB == (void*)(Derived*)nullB, ""); 6921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 6936cbfae439b81221d2250ffe0331958f130259755Kostya Serebryanynamespace ConversionOperators { 694ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenko 695ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenkostruct T { 696ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenko constexpr T(int n) : k(5*n - 3) {} 6976cbfae439b81221d2250ffe0331958f130259755Kostya Serebryany constexpr operator int() { return k; } 698ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenko int k; 699ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenko}; 700ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenko 7016cbfae439b81221d2250ffe0331958f130259755Kostya Serebryanystruct S { 702ada9ba14325df9e206f454c50bd1b55ea9ecdbb9Alexander Potapenko constexpr S(int n) : k(2*n + 1) {} 703ada9ba14325df9e206f454c50bd1b55ea9ecdbb9Alexander Potapenko constexpr operator int() { return k; } 704ada9ba14325df9e206f454c50bd1b55ea9ecdbb9Alexander Potapenko constexpr operator T() { return T(k); } 705ada9ba14325df9e206f454c50bd1b55ea9ecdbb9Alexander Potapenko int k; 706ada9ba14325df9e206f454c50bd1b55ea9ecdbb9Alexander Potapenko}; 707ada9ba14325df9e206f454c50bd1b55ea9ecdbb9Alexander Potapenko 7086cbfae439b81221d2250ffe0331958f130259755Kostya Serebryanyconstexpr bool check(T a, T b) { return a == b.k; } 70944997c354c7cdb5257d9a41c837b12a6133f2d6bKostya Serebryany 71044997c354c7cdb5257d9a41c837b12a6133f2d6bKostya Serebryanystatic_assert(S(5) == 11, ""); 71144997c354c7cdb5257d9a41c837b12a6133f2d6bKostya Serebryanystatic_assert(check(S(5), 11), ""); 71244997c354c7cdb5257d9a41c837b12a6133f2d6bKostya Serebryany 7136cbfae439b81221d2250ffe0331958f130259755Kostya Serebryany} 7146cbfae439b81221d2250ffe0331958f130259755Kostya Serebryany 71544997c354c7cdb5257d9a41c837b12a6133f2d6bKostya Serebryany} 71644997c354c7cdb5257d9a41c837b12a6133f2d6bKostya Serebryany 71744997c354c7cdb5257d9a41c837b12a6133f2d6bKostya Serebryanynamespace Temporaries { 718ca2849c2819b5c7a8771a1e8bc449cf8f5ef6527Alexey Samsonov 719c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryanystruct S { 720c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany constexpr S() {} 721c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany constexpr int f(); 722c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany}; 723c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryanystruct T : S { 724c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany constexpr T(int n) : S(), n(n) {} 725c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany int n; 726c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany}; 727c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryanyconstexpr int S::f() { 728c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany // 'this' must be the postfix-expression in a class member access expression, 729c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany // so we can't just use 7308530e2b953f0b34ecd267a6aba5f155d5c08c5c8Kostya Serebryany // return static_cast<T*>(this)->n; 731c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany return this->*(int(S::*))&T::n; 7328530e2b953f0b34ecd267a6aba5f155d5c08c5c8Kostya Serebryany} 7338530e2b953f0b34ecd267a6aba5f155d5c08c5c8Kostya Serebryany// The T temporary is implicitly cast to an S subobject, but we can recover the 7348530e2b953f0b34ecd267a6aba5f155d5c08c5c8Kostya Serebryany// T full-object via a base-to-derived cast, or a derived-to-base-casted member 735c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany// pointer. 7368530e2b953f0b34ecd267a6aba5f155d5c08c5c8Kostya Serebryanystatic_assert(T(3).f() == 3, ""); 7378530e2b953f0b34ecd267a6aba5f155d5c08c5c8Kostya Serebryany 7388530e2b953f0b34ecd267a6aba5f155d5c08c5c8Kostya Serebryanyconstexpr int f(const S &s) { 739c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany return static_cast<const T&>(s).n; 740c20b321d49f0eff60f1394d56e623d8ca94f24d7Kostya Serebryany} 741ca2849c2819b5c7a8771a1e8bc449cf8f5ef6527Alexey Samsonovconstexpr int n = f(T(5)); 7428530e2b953f0b34ecd267a6aba5f155d5c08c5c8Kostya Serebryanystatic_assert(f(T(5)) == 5, ""); 7431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr bool b(int n) { return &n; } 7451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(b(0), ""); 7461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 748ef8dfd8dffbf4385baf24e5aaea6c2cc7c6c936aAlexander Potapenko 7491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace Union { 7501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyunion U { 7521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int a; 7531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int b; 7541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 755938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov 7561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } }; // expected-warning 4{{C99 feature}} 7571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(u[0].a == 0, ""); 7581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(u[0].b, ""); // expected-error {{constant expression}} expected-note {{read of member 'b' of union with active member 'a'}} 7591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(u[1].b == 1, ""); 7601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 7611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}} expected-note {{cannot refer to element 2 of non-array object}} 7621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert((&(u[1]) + 1 + 1)->b == 3, ""); 7631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr U v = {}; 7651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(v.a == 0, ""); 7661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyunion Empty {}; 7681e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr Empty e = {}; 7691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Make sure we handle trivial copy constructors for unions. 7711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr U x = {42}; 7721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr U y = x; 7731e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(y.a == 42, ""); 7741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(y.b == 42, ""); // expected-error {{constant expression}} expected-note {{'b' of union with active member 'a'}} 7751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 7771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace MemberPointer { 7791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct A { 7801e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr A(int n) : n(n) {} 7811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int n; 7821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int f() { return n + 3; } 7831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 7841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr A a(7); 7851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(A(5).*&A::n == 5, ""); 7861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((&a)->*&A::n == 7, ""); 7871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((A(8).*&A::f)() == 11, ""); 7881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(((&a)->*&A::f)() == 10, ""); 7891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 7905a15541fc2bbe46a5ce0cd802b5c1055f2ffb14eKostya Serebryany struct B : A { 7911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr B(int n, int m) : A(n), m(m) {} 7921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int m; 7931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int g() { return n + m + 1; } 7941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 7951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr B b(9, 13); 7961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(B(4, 11).*&A::n == 4, ""); 7971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(B(4, 11).*&B::m == 11, ""); 7981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(B(4, 11).*(int(A::*))&B::m == 11, ""); 7991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((&b)->*&A::n == 9, ""); 8001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((&b)->*&B::m == 13, ""); 8011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((&b)->*(int(A::*))&B::m == 13, ""); 8021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((B(4, 11).*&A::f)() == 7, ""); 803b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert((B(4, 11).*&B::g)() == 16, ""); 804b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert((B(4, 11).*(int(A::*)()const)&B::g)() == 16, ""); 805b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(((&b)->*&A::f)() == 12, ""); 806b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(((&b)->*&B::g)() == 23, ""); 807b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(((&b)->*(int(A::*)()const)&B::g)() == 23, ""); 808716e2f25123bf9b20fbc6b582803a3929b78b96dKostya Serebryany 809716e2f25123bf9b20fbc6b582803a3929b78b96dKostya Serebryany struct S { 810716e2f25123bf9b20fbc6b582803a3929b78b96dKostya Serebryany constexpr S(int m, int n, int (S::*pf)() const, int S::*pn) : 8111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany m(m), n(n), pf(pf), pn(pn) {} 812b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany constexpr S() : m(), n(), pf(&S::f), pn(&S::n) {} 8131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int f() { return this->*pn; } 8151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany virtual int g() const; 8161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int m, n; 8181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int (S::*pf)() const; 819b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany int S::*pn; 8201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 8211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int S::*pm = &S::m; 8231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int S::*pn = &S::n; 8241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int (S::*pf)() const = &S::f; 8251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int (S::*pg)() const = &S::g; 826b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany 8271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr S s(2, 5, &S::f, &S::m); 8281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((s.*&S::f)() == 2, ""); 8301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((s.*s.pf)() == 2, ""); 8311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(pf == &S::f, ""); 8331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(pf == s.*&S::pf, ""); 8341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(pm == &S::m, ""); 8352697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany static_assert(pm != pn, ""); 8362697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany static_assert(s.pn != pn, ""); 8372697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany static_assert(s.pn == pm, ""); 8382697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany static_assert(pg != nullptr, ""); 8392697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany static_assert(pf != nullptr, ""); 8402697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany static_assert((int S::*)nullptr == nullptr, ""); 8411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(pg == pg, ""); // expected-error {{constant expression}} expected-note {{comparison of pointer to virtual member function 'g' has unspecified value}} 8421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(pf != pg, ""); // expected-error {{constant expression}} expected-note {{comparison of pointer to virtual member function 'g' has unspecified value}} 8431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany template<int n> struct T : T<n-1> {}; 8451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany template<> struct T<0> { int n; }; 8461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany template<> struct T<30> : T<29> { int m; }; 8471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany T<17> t17; 8491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany T<30> t30; 8501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 851b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany constexpr int (T<10>::*deepn) = &T<0>::n; 852b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(&(t17.*deepn) == &t17.n, ""); 853b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(deepn == &T<2>::n, ""); 854b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany 855716e2f25123bf9b20fbc6b582803a3929b78b96dKostya Serebryany constexpr int (T<15>::*deepm) = (int(T<10>::*))&T<30>::m; 856716e2f25123bf9b20fbc6b582803a3929b78b96dKostya Serebryany constexpr int *pbad = &(t17.*deepm); // expected-error {{constant expression}} 857a390ece58317a25ef26866cef6753df4b06a3e65Kostya Serebryany static_assert(&(t30.*deepm) == &t30.m, ""); 858a390ece58317a25ef26866cef6753df4b06a3e65Kostya Serebryany static_assert(deepm == &T<50>::m, ""); 859a390ece58317a25ef26866cef6753df4b06a3e65Kostya Serebryany static_assert(deepm != deepn, ""); 860b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany 861b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany constexpr T<5> *p17_5 = &t17; 862b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany constexpr T<13> *p17_13 = (T<13>*)p17_5; 863716e2f25123bf9b20fbc6b582803a3929b78b96dKostya Serebryany constexpr T<23> *p17_23 = (T<23>*)p17_13; // expected-error {{constant expression}} expected-note {{cannot cast object of dynamic type 'T<17>' to type 'T<23>'}} 864b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(&(p17_5->*(int(T<3>::*))deepn) == &t17.n, ""); 865b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(&(p17_13->*deepn) == &t17.n, ""); 866b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany constexpr int *pbad2 = &(p17_13->*(int(T<9>::*))deepm); // expected-error {{constant expression}} 867b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany 868b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany constexpr T<5> *p30_5 = &t30; 869b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany constexpr T<23> *p30_23 = (T<23>*)p30_5; 870b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany constexpr T<13> *p30_13 = p30_23; 871b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(&(p30_5->*(int(T<3>::*))deepn) == &t30.n, ""); 872b8a59a0e030d0aacf4df1fe8f7fb4e6f82bab654Kostya Serebryany static_assert(&(p30_13->*deepn) == &t30.n, ""); 873716e2f25123bf9b20fbc6b582803a3929b78b96dKostya Serebryany static_assert(&(p30_23->*deepn) == &t30.n, ""); 874716e2f25123bf9b20fbc6b582803a3929b78b96dKostya Serebryany static_assert(&(p30_5->*(int(T<2>::*))deepm) == &t30.m, ""); 8751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(&(((T<17>*)p30_13)->*deepm) == &t30.m, ""); 8761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(&(p30_23->*deepm) == &t30.m, ""); 8775af39e50366f1aacbebc284f572f08ad1ad07357Kostya Serebryany 8781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct Base { int n; }; 8791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany template<int N> struct Mid : Base {}; 8801e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct Derived : Mid<0>, Mid<1> {}; 8811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(&Mid<0>::n == &Mid<1>::n, ""); 882ca9b5dd9922fb7f6e0ca06dbba7db7398b8997f1Kostya Serebryany static_assert((int Derived::*)(int Mid<0>::*)&Mid<0>::n != 8831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany (int Derived::*)(int Mid<1>::*)&Mid<1>::n, ""); 8841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(&Mid<0>::n == (int Mid<0>::*)&Base::n, ""); 8851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 8861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 887938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanovnamespace ArrayBaseDerived { 8881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct Base { 8901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base() {} 8911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int n = 0; 8921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 8931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct Derived : Base { 8941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Derived() {} 8951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr const int *f() { return &n; } 8961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 8971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 8981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Derived a[10]; 8991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Derived *pd3 = const_cast<Derived*>(&a[3]); 9001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base *pb3 = const_cast<Derived*>(&a[3]); 9011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(pb3 == pd3, ""); 9021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // pb3 does not point to an array element. 9041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base *pb4 = pb3 + 1; // ok, one-past-the-end pointer. 9051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int pb4n = pb4->n; // expected-error {{constant expression}} expected-note {{cannot access field of pointer past the end}} 9061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base *err_pb5 = pb3 + 2; // expected-error {{constant expression}} expected-note {{cannot refer to element 2}} expected-note {{here}} 9071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int err_pb5n = err_pb5->n; // expected-error {{constant expression}} expected-note {{initializer of 'err_pb5' is not a constant expression}} 9081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base *err_pb2 = pb3 - 1; // expected-error {{constant expression}} expected-note {{cannot refer to element -1}} expected-note {{here}} 9091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int err_pb2n = err_pb2->n; // expected-error {{constant expression}} expected-note {{initializer of 'err_pb2'}} 9101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base *pb3a = pb4 - 1; 9111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // pb4 does not point to a Derived. 9131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Derived *err_pd4 = (Derived*)pb4; // expected-error {{constant expression}} expected-note {{cannot access derived class of pointer past the end}} 9141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Derived *pd3a = (Derived*)pb3a; 9151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int pd3n = pd3a->n; 9161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // pd3a still points to the Derived array. 9181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Derived *pd6 = pd3a + 3; 9191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(pd6 == &a[6], ""); 9201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Derived *pd9 = pd6 + 3; 9211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Derived *pd10 = pd6 + 4; 9221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int pd9n = pd9->n; // ok 9231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int err_pd10n = pd10->n; // expected-error {{constant expression}} expected-note {{cannot access base class of pointer past the end}} 9241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int pd0n = pd10[-10].n; 9251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int err_pdminus1n = pd10[-11].n; // expected-error {{constant expression}} expected-note {{cannot refer to element -1 of}} 9261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr Base *pb9 = pd9; 9281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr const int *(Base::*pfb)() const = 9291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_cast<const int *(Base::*)() const>(&Derived::f); 9301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert((pb9->*pfb)() == &a[9].n, ""); 9311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 9321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace Complex { 9341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyclass complex { 9361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int re, im; 9371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanypublic: 9381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr complex(int re = 0, int im = 0) : re(re), im(im) {} 9391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr complex(const complex &o) : re(o.re), im(o.im) {} 9401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr complex operator-() const { return complex(-re, -im); } 9411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany friend constexpr complex operator+(const complex &l, const complex &r) { 9421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return complex(l.re + r.re, l.im + r.im); 9431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 9441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany friend constexpr complex operator-(const complex &l, const complex &r) { 9451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return l + -r; 9461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 9471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany friend constexpr complex operator*(const complex &l, const complex &r) { 9481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return complex(l.re * r.re - l.im * r.im, l.re * r.im + l.im * r.re); 9491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 9501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany friend constexpr bool operator==(const complex &l, const complex &r) { 9511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return l.re == r.re && l.im == r.im; 9521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 9531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr bool operator!=(const complex &r) const { 9541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return re != r.re || im != r.im; 9551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 9561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int real() const { return re; } 9571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int imag() const { return im; } 9581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany}; 9591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr complex i = complex(0, 1); 9611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr complex k = (3 + 4*i) * (6 - 4*i); 9621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(complex(1,0).real() == 1, ""); 963c37ca572876a585b6a910f14a85cc7ba7fc22f20Kostya Serebryanystatic_assert(complex(1,0).imag() == 0, ""); 964c37ca572876a585b6a910f14a85cc7ba7fc22f20Kostya Serebryanystatic_assert(((complex)1).imag() == 0, ""); 965c37ca572876a585b6a910f14a85cc7ba7fc22f20Kostya Serebryanystatic_assert(k.real() == 34, ""); 966c37ca572876a585b6a910f14a85cc7ba7fc22f20Kostya Serebryanystatic_assert(k.imag() == 12, ""); 9675a15541fc2bbe46a5ce0cd802b5c1055f2ffb14eKostya Serebryanystatic_assert(k - 34 == 12*i, ""); 968c37ca572876a585b6a910f14a85cc7ba7fc22f20Kostya Serebryanystatic_assert((complex)1 == complex(1), ""); 969c37ca572876a585b6a910f14a85cc7ba7fc22f20Kostya Serebryanystatic_assert((complex)1 != complex(0, 1), ""); 9701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(complex(1) == complex(1), ""); 9711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(complex(1) != complex(0, 1), ""); 9721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr complex makeComplex(int re, int im) { return complex(re, im); } 9731e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(makeComplex(1,0) == complex(1), ""); 9741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(makeComplex(1,0) != complex(0, 1), ""); 975918b18a849cea679bff31a4e0dfb3745302c240aKostya Serebryany 9761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyclass complex_wrap : public complex { 9771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanypublic: 978918b18a849cea679bff31a4e0dfb3745302c240aKostya Serebryany constexpr complex_wrap(int re, int im = 0) : complex(re, im) {} 979918b18a849cea679bff31a4e0dfb3745302c240aKostya Serebryany constexpr complex_wrap(const complex_wrap &o) : complex(o) {} 980918b18a849cea679bff31a4e0dfb3745302c240aKostya Serebryany}; 981918b18a849cea679bff31a4e0dfb3745302c240aKostya Serebryany 982ca9b5dd9922fb7f6e0ca06dbba7db7398b8997f1Kostya Serebryanystatic_assert((complex_wrap)1 == complex(1), ""); 983918b18a849cea679bff31a4e0dfb3745302c240aKostya Serebryanystatic_assert((complex)1 != complex_wrap(0, 1), ""); 9841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(complex(1) == complex_wrap(1), ""); 985918b18a849cea679bff31a4e0dfb3745302c240aKostya Serebryanystatic_assert(complex_wrap(1) != complex(0, 1), ""); 9861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr complex_wrap makeComplexWrap(int re, int im) { 9871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return complex_wrap(re, im); 988938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov} 9891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(makeComplexWrap(1,0) == complex(1), ""); 9901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystatic_assert(makeComplexWrap(1,0) != complex(0, 1), ""); 9911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 9931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace PR11595 { 9951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct A { constexpr bool operator==(int x) { return true; } }; 9961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct B { B(); A& x; }; 9971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(B().x == 3, ""); // expected-error {{constant expression}} expected-note {{non-literal type 'PR11595::B' cannot be used in a constant expression}} 9981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 9991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr bool f(int k) { // expected-error {{constexpr function never produces a constant expression}} 10001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return B().x == k; // expected-note {{non-literal type 'PR11595::B' cannot be used in a constant expression}} 10011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 10021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 10031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 10041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace ExprWithCleanups { 10051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct A { A(); ~A(); int get(); }; 10061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int get(bool FromA) { return FromA ? A().get() : 1; } 10071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int n = get(false); 10081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 10091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 10101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace Volatile { 10111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 10121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvolatile constexpr int n1 = 0; // expected-note {{here}} 10131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvolatile const int n2 = 0; // expected-note {{here}} 10141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyint n3 = 37; // expected-note {{declared here}} 10151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 10161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int m1 = n1; // expected-error {{constant expression}} expected-note {{read of volatile-qualified type 'const volatile int'}} 10171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int m2 = n2; // expected-error {{constant expression}} expected-note {{read of volatile-qualified type 'const volatile int'}} 10181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int m1b = const_cast<const int&>(n1); // expected-error {{constant expression}} expected-note {{read of volatile object 'n1'}} 10191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int m2b = const_cast<const int&>(n2); // expected-error {{constant expression}} expected-note {{read of volatile object 'n2'}} 10202697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany 10211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanystruct T { int n; }; 10221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconst T t = { 42 }; // expected-note {{declared here}} 10232697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany 10241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int f(volatile int &&r) { 10251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return r; // expected-note {{read of volatile-qualified type 'volatile int'}} 10261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1027f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryanyconstexpr int g(volatile int &&r) { 1028f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryany return const_cast<int&>(r); // expected-note {{read of volatile temporary is not allowed in a constant expression}} 10297b7b55e99166511ce1e66bf6b79c46ae4aa60d17Evgeniy Stepanov} 1030f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryanystruct S { 1031f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryany int j : f(0); // expected-error {{constant expression}} expected-note {{in call to 'f(0)'}} 1032f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryany int k : g(0); // expected-error {{constant expression}} expected-note {{temporary created here}} expected-note {{in call to 'g(0)'}} 1033f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryany int l : n3; // expected-error {{constant expression}} expected-note {{read of non-const variable}} 1034f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryany int m : t.n; // expected-error {{constant expression}} expected-note {{read of non-constexpr variable}} 10352697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany}; 10362697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany 1037f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryany} 1038f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryany 1039f58f998066db0231e521169d2f50af439ceecb49Kostya Serebryanynamespace ExternConstexpr { 10401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany extern constexpr int n = 0; 1041938106753364d96cedc11cbdc35a15030fb44d0cTimur Iskhodzhanov extern constexpr int m; // expected-error {{constexpr variable declaration must be a definition}} 10421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany void f() { 10431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany extern constexpr int i; // expected-error {{constexpr variable declaration must be a definition}} 10441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int j = 0; 10451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int k; // expected-error {{default initialization of an object of const type}} 10461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 10471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 10481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 10491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace ComplexConstexpr { 10501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr _Complex float test1 = {}; 10511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr _Complex float test2 = {1}; 10521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr _Complex double test3 = {1,2}; 10531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr _Complex int test4 = {4}; 10541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr _Complex int test5 = 4; 10551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr _Complex int test6 = {5,6}; 10561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany typedef _Complex float fcomplex; 10571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr fcomplex test7 = fcomplex(); 10581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 10591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr const double &t2r = __real test3; 10601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr const double &t2i = __imag test3; 10611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(&t2r + 1 == &t2i, ""); 10621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(t2r == 1.0, ""); 10631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(t2i == 2.0, ""); 10641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr const double *t2p = &t2r; 1065c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany static_assert(t2p[-1] == 0.0, ""); // expected-error {{constant expr}} expected-note {{cannot refer to element -1 of array of 2 elements}} 1066c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany static_assert(t2p[0] == 1.0, ""); 1067c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany static_assert(t2p[1] == 2.0, ""); 1068c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany static_assert(t2p[2] == 0.0, ""); // expected-error {{constant expr}} expected-note {{one-past-the-end pointer}} 1069c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany static_assert(t2p[3] == 0.0, ""); // expected-error {{constant expr}} expected-note {{cannot refer to element 3 of array of 2 elements}} 1070c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany constexpr _Complex float *p = 0; 1071c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany constexpr float pr = __real *p; // expected-error {{constant expr}} expected-note {{cannot access real component of null}} 1072c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany constexpr float pi = __imag *p; // expected-error {{constant expr}} expected-note {{cannot access imaginary component of null}} 1073c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany constexpr const _Complex double *q = &test3 + 1; 1074c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany constexpr double qr = __real *q; // expected-error {{constant expr}} expected-note {{cannot access real component of pointer past the end}} 1075c655cfa8dc0fdf5b521e565f6cbdbf7981fba1b2Kostya Serebryany constexpr double qi = __imag *q; // expected-error {{constant expr}} expected-note {{cannot access imaginary component of pointer past the end}} 10761cffef3e39cad4eb33606afbebac78d6637361acAlexey Samsonov 10773be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany static_assert(__real test6 == 5, ""); 10783be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany static_assert(__imag test6 == 6, ""); 10793be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany static_assert(&__imag test6 == &__real test6 + 1, ""); 10803be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany} 10813be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany 10823be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryanynamespace InstantiateCaseStmt { 10833be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany template<int x> constexpr int f() { return x; } 10843be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany template<int x> int g(int c) { switch(c) { case f<x>(): return 1; } return 0; } 10853be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany int gg(int c) { return g<4>(c); } 10863be19f4fa3519e358fd41a5feda82c39a22ef107Kostya Serebryany} 108729e09223b9d4f53f1be528d6a572b66034c26611Alexey Samsonov 10888db82e151f4dc3de33530adce370a3d86be54cf9Alexander Potapenkonamespace ConvertedConstantExpr { 10898db82e151f4dc3de33530adce370a3d86be54cf9Alexander Potapenko extern int &m; 10908db82e151f4dc3de33530adce370a3d86be54cf9Alexander Potapenko extern int &n; 1091fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany 1092fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany constexpr int k = 4; 1093fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany int &m = const_cast<int&>(k); 1094fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany 10958f0e311767b783db4a15139dddfe7a924fa3724eAlexey Samsonov // If we have nothing more interesting to say, ensure we don't produce a 1096fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany // useless note and instead just point to the non-constant subexpression. 1097fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany enum class E { 1098fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany em = m, 1099fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany en = n, // expected-error {{not a constant expression}} 1100fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany eo = (m + 1101fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany n // expected-error {{not a constant expression}} 1102fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany ), 1103fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany eq = reinterpret_cast<int>((int*)0) // expected-error {{not a constant expression}} expected-note {{reinterpret_cast}} 1104fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany }; 1105fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany} 1106fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany 1107fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryanynamespace IndirectField { 1108fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany struct S { 110929e09223b9d4f53f1be528d6a572b66034c26611Alexey Samsonov struct { // expected-warning {{GNU extension}} 1110fe6d91684bcda766593800f6307233f1a33d31f6Kostya Serebryany union { 11111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct { // expected-warning {{GNU extension}} 11121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int a; 11131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int b; 11141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 11151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int c; 11161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 11171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int d; 11181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 11191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany union { 11201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int e; 11211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int f; 11221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 11231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr S(int a, int b, int d, int e) : a(a), b(b), d(d), e(e) {} 11241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr S(int c, int d, int f) : c(c), d(d), f(f) {} 11251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany }; 11261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr S s1(1, 2, 3, 4); 11281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr S s2(5, 6, 7); 11292697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany 11302697687059e64a4f1319dc23a0a3ca59982d53f6Kostya Serebryany // FIXME: The diagnostics here do a very poor job of explaining which unnamed 11311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // member is active and which is requested. 11321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s1.a == 1, ""); 11331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s1.b == 2, ""); 11341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s1.c == 0, ""); // expected-error {{constant expression}} expected-note {{union with active member}} 11351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s1.d == 3, ""); 11361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s1.e == 4, ""); 11371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s1.f == 0, ""); // expected-error {{constant expression}} expected-note {{union with active member}} 11381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s2.a == 0, ""); // expected-error {{constant expression}} expected-note {{union with active member}} 11401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s2.b == 0, ""); // expected-error {{constant expression}} expected-note {{union with active member}} 11411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s2.c == 5, ""); 11421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s2.d == 6, ""); 11431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s2.e == 0, ""); // expected-error {{constant expression}} expected-note {{union with active member}} 11441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(s2.f == 7, ""); 11451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 11461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// DR1405: don't allow reading mutable members in constant expressions. 11485af39e50366f1aacbebc284f572f08ad1ad07357Kostya Serebryanynamespace MutableMembers { 11491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct MM { 11501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany mutable int n; // expected-note 3{{declared here}} 11511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } constexpr mm = { 4 }; 11521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int mmn = mm.n; // expected-error {{constant expression}} expected-note {{read of mutable member 'n' is not allowed in a constant expression}} 11531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int x = (mm.n = 1, 3); 11541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int mmn2 = mm.n; // expected-error {{constant expression}} expected-note {{read of mutable member 'n' is not allowed in a constant expression}} 11551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // Here's one reason why allowing this would be a disaster... 11571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany template<int n> struct Id { int k = n; }; 11581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int f() { 11591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr MM m = { 0 }; 11601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany ++m.n; 11611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return Id<m.n>().k; // expected-error {{not a constant expression}} expected-note {{read of mutable member 'n' is not allowed in a constant expression}} 11621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 11631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct A { int n; }; 11651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct B { mutable A a; }; // expected-note {{here}} 11661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany struct C { B b; }; 11671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr C c[3] = {}; 11681e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int k = c[1].b.a.n; // expected-error {{constant expression}} expected-note {{mutable}} 11691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 11701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace Fold { 11721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11731e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // This macro forces its argument to be constant-folded, even if it's not 11741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // otherwise a constant expression. 11751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany #define fold(x) (__builtin_constant_p(x) ? (x) : (x)) 11761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int n = (int)(char*)123; // expected-error {{constant expression}} expected-note {{reinterpret_cast}} 11781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany constexpr int m = fold((int)(char*)123); // ok 11791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany static_assert(m == 123, ""); 11800aa04b3f432bc55e7c116d5280685ee3f243be8eKostya Serebryany 11811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany #undef fold 11821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 11831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 11844eaa17848ed02cae465f10aa5fe095e42dbf0d61Kostya Serebryany 11850796393f2088e3b75c4110934451160eeb037fabKostya Serebryanynamespace DR1454 { 11864eaa17848ed02cae465f10aa5fe095e42dbf0d61Kostya Serebryany 11874eaa17848ed02cae465f10aa5fe095e42dbf0d61Kostya Serebryanyconstexpr const int &f(const int &n) { return n; } 11884eaa17848ed02cae465f10aa5fe095e42dbf0d61Kostya Serebryanyconstexpr int k1 = f(0); // ok 11894eaa17848ed02cae465f10aa5fe095e42dbf0d61Kostya Serebryany 1190ca9b5dd9922fb7f6e0ca06dbba7db7398b8997f1Kostya Serebryanystruct Wrap { 11914eaa17848ed02cae465f10aa5fe095e42dbf0d61Kostya Serebryany const int &value; 11924eaa17848ed02cae465f10aa5fe095e42dbf0d61Kostya Serebryany}; 11934eaa17848ed02cae465f10aa5fe095e42dbf0d61Kostya Serebryanyconstexpr const Wrap &g(const Wrap &w) { return w; } 11941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyconstexpr int k2 = g({0}).value; // ok 11955b6eab9dc5572a66e3af54ab087255ffa4dd5185Evgeniy Stepanov 11965b6eab9dc5572a66e3af54ab087255ffa4dd5185Evgeniy Stepanovconstexpr const int &i = 0; // expected-error {{constant expression}} expected-note {{temporary}} expected-note 2{{here}} 11975b6eab9dc5572a66e3af54ab087255ffa4dd5185Evgeniy Stepanovconstexpr const int j = i; // expected-error {{constant expression}} expected-note {{initializer of 'i' is not a constant expression}} 11985b6eab9dc5572a66e3af54ab087255ffa4dd5185Evgeniy Stepanov 11995b6eab9dc5572a66e3af54ab087255ffa4dd5185Evgeniy Stepanov} 12009b90e95d4dc59c6d97ed73b2470f5e21e7b346d5Kostya Serebryany 12015b6eab9dc5572a66e3af54ab087255ffa4dd5185Evgeniy Stepanovnamespace RecursiveOpaqueExpr { 12029b90e95d4dc59c6d97ed73b2470f5e21e7b346d5Kostya Serebryany template<typename Iter> 120376e842845c927e92c2c21c41ac51e364fa17528cAlexey Samsonov constexpr auto LastNonzero(Iter p, Iter q) -> decltype(+*p) { 1204 return p != q ? (LastNonzero(p+1, q) ?: *p) : 0; // expected-warning {{GNU}} 1205 } 1206 1207 constexpr int arr1[] = { 1, 0, 0, 3, 0, 2, 0, 4, 0, 0 }; 1208 static_assert(LastNonzero(begin(arr1), end(arr1)) == 4, ""); 1209 1210 constexpr int arr2[] = { 1, 0, 0, 3, 0, 2, 0, 4, 0, 5 }; 1211 static_assert(LastNonzero(begin(arr2), end(arr2)) == 5, ""); 1212} 1213 1214namespace VLASizeof { 1215 1216 void f(int k) { 1217 int arr[k]; // expected-warning {{C99}} 1218 constexpr int n = 1 + 1219 sizeof(arr) // expected-error {{constant expression}} 1220 * 3; 1221 } 1222} 1223 1224namespace CompoundLiteral { 1225 // FIXME: 1226 // We don't model the semantics of this correctly: the compound literal is 1227 // represented as a prvalue in the AST, but actually behaves like an lvalue. 1228 // We treat the compound literal as a temporary and refuse to produce a 1229 // pointer to it. This is OK: we're not required to treat this as a constant 1230 // in C++, and in C we model compound literals as lvalues. 1231 constexpr int *p = (int*)(int[1]){0}; // expected-warning {{C99}} expected-error {{constant expression}} expected-note 2{{temporary}} 1232} 1233