constant-expression-cxx11.cpp revision f59ff8c777379bd54137853a58c58b72fb869152
18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 -pedantic %s -Wno-comment 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3fb79edc9df1f20461e90e478363d207348213d35Dmitry Shmidtnamespace StaticAssertFoldTest { 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 58d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint x; 68d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(++x, "test"); // expected-error {{not an integral constant expression}} 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(false, "test"); // expected-error {{test}} 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 9c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt} 10c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt 118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// FIXME: support const T& parameters here. 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt//template<typename T> constexpr T id(const T &t) { return t; } 138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidttemplate<typename T> constexpr T id(T t) { return t; } // expected-note {{here}} 148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// FIXME: support templates here. 158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt//template<typename T> constexpr T min(const T &a, const T &b) { 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// return a < b ? a : b; 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt//} 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt//template<typename T> constexpr T max(const T &a, const T &b) { 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// return a < b ? b : a; 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt//} 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int min(const int &a, const int &b) { return a < b ? a : b; } 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int max(const int &a, const int &b) { return a < b ? b : a; } 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct MemberZero { 251f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int zero() { return 0; } 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace DerivedToVBaseCast { 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct U { int n; }; 31cf32e60fa7e0d33fe1551a6dba8dcbbec47ea50eDmitry Shmidt struct V : U { int n; }; 327832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidt struct A : virtual V { int n; }; 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct Aa { int n; }; 341f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct B : virtual A, Aa {}; 351f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct C : virtual A, Aa {}; 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct D : B, C {}; 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt D d; 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr B *p = &d; 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr C *q = &d; 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert((void*)p != (void*)q, ""); 42c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt static_assert((A*)p == (A*)q, ""); 431f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((Aa*)p != (Aa*)q, ""); 441f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 451f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr B &pp = d; 461f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr C &qq = d; 471f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((void*)&pp != (void*)&qq, ""); 481f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(A&)pp == &(A&)qq, ""); 491f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(Aa&)pp != &(Aa&)qq, ""); 501f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 511f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr V *v = p; 521f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr V *w = q; 531f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr V *x = (A*)p; 541f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(v == w, ""); 551f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(v == x, ""); 561f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 571f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((U*)&d == p, ""); 581f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((U*)&d == q, ""); 591f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((U*)&d == v, ""); 601f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((U*)&d == w, ""); 611f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((U*)&d == x, ""); 621f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 631f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct X {}; 641f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct Y1 : virtual X {}; 651f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct Y2 : X {}; 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct Z : Y1, Y2 {}; 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt Z z; 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert((X*)(Y1*)&z != (X*)(Y2*)&z, ""); 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace ConstCast { 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int n1 = 0; 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int n2 = const_cast<int&>(n1); 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int *n3 = const_cast<int*>(&n1); 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int n4 = *const_cast<int*>(&n1); 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr const int * const *n5 = const_cast<const int* const*>(&n3); 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int **n6 = const_cast<int**>(&n3); 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int n7 = **n5; 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int n8 = **n6; 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace TemplateArgumentConversion { 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt template<int n> struct IntParam {}; 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt using IntParam0 = IntParam<0>; 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt // FIXME: This should be accepted once we implement the new ICE rules. 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt using IntParam0 = IntParam<id(0)>; // expected-error {{not an integral constant expression}} 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt using IntParam0 = IntParam<MemberZero().zero>; // expected-error {{did you mean to call it with no arguments?}} expected-error {{not an integral constant expression}} 928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace CaseStatements { 958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt void f(int n) { 968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt switch (n) { 978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt // FIXME: Produce the 'add ()' fixit for this. 988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt case MemberZero().zero: // desired-error {{did you mean to call it with no arguments?}} expected-error {{not an integer constant expression}} expected-note {{non-literal type '<bound member function type>'}} 998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt // FIXME: This should be accepted once we implement the new ICE rules. 1008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt case id(1): // expected-error {{not an integer constant expression}} expected-note {{undefined function}} 1018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; 1028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtextern int &Recurse1; 1078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint &Recurse2 = Recurse1, &Recurse1 = Recurse2; 1088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int &Recurse3 = Recurse2; // expected-error {{must be initialized by a constant expression}} 1098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace MemberEnum { 1118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct WithMemberEnum { 1128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt enum E { A = 42 }; 1138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } wme; 1145460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidt 1155460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidt static_assert(wme.A == 42, ""); 1165460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidt} 1175460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidt 1185460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidtnamespace DefaultArguments { 1195460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidt 1205460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidtconst int z = int(); 1215460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidtconstexpr int Sum(int a = 0, const int &b = 0, const int *c = &z, char d = 0) { 1225460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidt return a + b + *c + d; 1235460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidt} 1245460547a121207cf7a99eac45e05fcdd83be3161Dmitry Shmidtconst int four = 4; 1251f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr int eight = 8; 1261f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr const int twentyseven = 27; 1271f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(Sum() == 0, ""); 1281f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(Sum(1) == 1, ""); 1291f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(Sum(1, four) == 5, ""); 1301f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(Sum(1, eight, &twentyseven) == 36, ""); 1311f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(Sum(1, 2, &four, eight) == 15, ""); 1321f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 1331f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt} 1341f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 1351f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtnamespace Ellipsis { 1361f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 1371f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt// Note, values passed through an ellipsis can't actually be used. 1381f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr int F(int a, ...) { return a; } 1391f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(F(0) == 0, ""); 1401f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(F(1, 0) == 1, ""); 1411f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(F(2, "test") == 2, ""); 1421f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(F(3, &F) == 3, ""); 1431f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtint k = 0; 1441f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(F(4, k) == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 1451f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 1461f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt} 1471f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 1481f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtnamespace Recursion { 1491f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int fib(int n) { return n > 1 ? fib(n-1) + fib(n-2) : n; } 1501f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(fib(11) == 89, ""); 1511f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 1521f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int gcd_inner(int a, int b) { 1531f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return b == 0 ? a : gcd_inner(b, a % b); 1541f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 1551f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int gcd(int a, int b) { 15668d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt return gcd_inner(max(a, b), min(a, b)); 15768d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt } 15868d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt 15968d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt static_assert(gcd(1749237, 5628959) == 7, ""); 16068d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt} 16168d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt 16268d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtnamespace FunctionCast { 16368d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt // When folding, we allow functions to be cast to different types. Such 16468d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt // cast functions cannot be called, even if they're constexpr. 16568d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt constexpr int f() { return 1; } 16668d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt typedef double (*DoubleFn)(); 16768d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt typedef int (*IntFn)(); 16868d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt int a[(int)DoubleFn(f)()]; // expected-error {{variable length array}} expected-warning{{extension}} 16968d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt int b[(int)IntFn(f)()]; // ok 17068d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt} 17168d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt 17268d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtnamespace StaticMemberFunction { 17368d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt struct S { 17468d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt static constexpr int k = 42; 17568d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt static constexpr int f(int n) { return n * k + 2; } 17668d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt } s; 17768d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt 17868d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt constexpr int n = s.f(19); 17968d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt static_assert(S::f(19) == 800, ""); 18068d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt static_assert(s.f(19) == 800, ""); 1818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(n == 800, ""); 1828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int (*sf1)(int) = &S::f; 1848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int (*sf2)(int) = &s.f; 1858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr const int *sk = &s.k; 1868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace ParameterScopes { 1898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const int k = 42; 1918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr const int &ObscureTheTruth(const int &a) { return a; } 1928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr const int &MaybeReturnJunk(bool b, const int a) { 1938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return ObscureTheTruth(b ? a : k); 1948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(MaybeReturnJunk(false, 0) == 42, ""); // ok 1968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int a = MaybeReturnJunk(true, 0); // expected-error {{constant expression}} 1971f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 19834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr const int MaybeReturnNonstaticRef(bool b, const int a) { 19934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt // If ObscureTheTruth returns a reference to 'a', the result is not a 2001f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt // constant expression even though 'a' is still in scope. 2011f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return ObscureTheTruth(b ? a : k); 2021f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 2031f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(MaybeReturnNonstaticRef(false, 0) == 42, ""); // ok 2041f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int b = MaybeReturnNonstaticRef(true, 0); // expected-error {{constant expression}} 2051f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 2061f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int InternalReturnJunk(int n) { 2071f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt // FIXME: We should reject this: it never produces a constant expression. 2081f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return MaybeReturnJunk(true, n); 2091f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 2101f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int n3 = InternalReturnJunk(0); // expected-error {{must be initialized by a constant expression}} 2111f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 2121f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int LToR(int &n) { return n; } 2131f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int GrabCallersArgument(bool which, int a, int b) { 2141f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return LToR(which ? b : a); 2151f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 2161f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(GrabCallersArgument(false, 1, 2) == 1, ""); 2171f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(GrabCallersArgument(true, 4, 8) == 8, ""); 2188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 2201f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 2211f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtnamespace Pointers { 2228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int f(int n, const int *a, const int *b, const int *c) { 2248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return n == 0 ? 0 : *a + f(n-1, b, c, a); 2258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 22634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 2278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const int x = 1, y = 10, z = 100; 2288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(f(23, &x, &y, &z) == 788, ""); 2298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int g(int n, int a, int b, int c) { 2318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return f(n, &a, &b, &c); 23204949598a23f501be6eec21697465fd46a28840aDmitry Shmidt } 23334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt static_assert(g(23, x, y, z) == 788, ""); 234cce06667447b5aec83452adb0c15100ada531095Dmitry Shmidt 2351f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt} 2361f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 2371f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtnamespace FunctionPointers { 2381f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 2397832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidt constexpr int Double(int n) { return 2 * n; } 240b7b4d0ec07161a6d76c40ba7ef1306e82fbb7e15Dmitry Shmidt constexpr int Triple(int n) { return 3 * n; } 2411f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int Twice(int (*F)(int), int n) { return F(F(n)); } 242a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt constexpr int Quadruple(int n) { return Twice(Double, n); } 2431f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr auto Select(int n) -> int (*)(int) { 2441f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0; 2451f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 2461f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int Apply(int (*F)(int), int n) { return F(n); } 2471f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 2488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, ""); 2498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int Invalid = Apply(Select(0), 0); // expected-error {{must be initialized by a constant expression}} 2518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 2531f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 2548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace PointerComparison { 2558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint x, y; 2578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&x == &y, "false"); // expected-error {{false}} 2588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&x != &y, ""); 2591f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr bool g1 = &x == &y; 2608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool g2 = &x != &y; 2618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool g3 = &x <= &y; // expected-error {{must be initialized by a constant expression}} 262444d567b27731d8572ef37697dd12fd1c37c2f24Dmitry Shmidtconstexpr bool g4 = &x >= &y; // expected-error {{must be initialized by a constant expression}} 263444d567b27731d8572ef37697dd12fd1c37c2f24Dmitry Shmidtconstexpr bool g5 = &x < &y; // expected-error {{must be initialized by a constant expression}} 2648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool g6 = &x > &y; // expected-error {{must be initialized by a constant expression}} 2658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct S { int x, y; } s; 2678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&s.x == &s.y, "false"); // expected-error {{false}} 2688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&s.x != &s.y, ""); 2695605286c30e1701491bd3af974ae423727750eddDmitry Shmidtstatic_assert(&s.x <= &s.y, ""); 2705605286c30e1701491bd3af974ae423727750eddDmitry Shmidtstatic_assert(&s.x >= &s.y, "false"); // expected-error {{false}} 2715605286c30e1701491bd3af974ae423727750eddDmitry Shmidtstatic_assert(&s.x < &s.y, ""); 2725605286c30e1701491bd3af974ae423727750eddDmitry Shmidtstatic_assert(&s.x > &s.y, "false"); // expected-error {{false}} 2735605286c30e1701491bd3af974ae423727750eddDmitry Shmidt 2748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(0 == &y, "false"); // expected-error {{false}} 2758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(0 != &y, ""); 2768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool n3 = 0 <= &y; // expected-error {{must be initialized by a constant expression}} 2778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool n4 = 0 >= &y; // expected-error {{must be initialized by a constant expression}} 2788bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidtconstexpr bool n5 = 0 < &y; // expected-error {{must be initialized by a constant expression}} 2798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool n6 = 0 > &y; // expected-error {{must be initialized by a constant expression}} 2808bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidt 2818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&x == 0, "false"); // expected-error {{false}} 2828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&x != 0, ""); 2838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool n9 = &x <= 0; // expected-error {{must be initialized by a constant expression}} 2841f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr bool n10 = &x >= 0; // expected-error {{must be initialized by a constant expression}} 2851f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr bool n11 = &x < 0; // expected-error {{must be initialized by a constant expression}} 2868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool n12 = &x > 0; // expected-error {{must be initialized by a constant expression}} 2878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&x == &x, ""); 2898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&x != &x, "false"); // expected-error {{false}} 2901f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(&x <= &x, ""); 2918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&x >= &x, ""); 2921f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(&x < &x, "false"); // expected-error {{false}} 2938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&x > &x, "false"); // expected-error {{false}} 2941f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 2951f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr S* sptr = &s; 2961f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt// FIXME: This is not a constant expression; check we reject this and move this 2971f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt// test elsewhere. 2981f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr bool dyncast = sptr == dynamic_cast<S*>(sptr); 2991f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 3001f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstruct Str { 301d5e4923d04122f81300fa68fb07d64ede28fd44dDmitry Shmidt // FIXME: In C++ mode, we should say 'integral' not 'integer' 3027dba0e5708da7276a43a44cf479aa743564e15b9Dmitry Shmidt int a : dynamic_cast<S*>(sptr) == dynamic_cast<S*>(sptr); // \ 30334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt expected-warning {{not integer constant expression}} \ 304e0e48dc666fb14a7bb60264ca87463ba7bc1fe0bDmitry Shmidt expected-note {{dynamic_cast is not allowed in a constant expression}} 305e0e48dc666fb14a7bb60264ca87463ba7bc1fe0bDmitry Shmidt int b : reinterpret_cast<S*>(sptr) == reinterpret_cast<S*>(sptr); // \ 306e0e48dc666fb14a7bb60264ca87463ba7bc1fe0bDmitry Shmidt expected-warning {{not integer constant expression}} \ 3077d5c8f257a74ac0d12828962a492e8b84ef83923Dmitry Shmidt expected-note {{reinterpret_cast is not allowed in a constant expression}} 3089866086a955d00e237cc8df3722e7dff75c02532Dmitry Shmidt int c : (S*)(long)(sptr) == (S*)(long)(sptr); // \ 309d11f019d62a42a8fc4c4d1f2ec17cf35b0763153Dmitry Shmidt expected-warning {{not integer constant expression}} \ 3102271d3fdd5982d0e5e81cf9999a861bba933eacbDmitry Shmidt expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 3118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int d : (S*)(42) == (S*)(42); // \ 3128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected-warning {{not integer constant expression}} \ 3138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 3148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int e : (Str*)(sptr) == (Str*)(sptr); // \ 3158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected-warning {{not integer constant expression}} \ 3168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 3178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int f : &(Str&)(*sptr) == &(Str&)(*sptr); // \ 3188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected-warning {{not integer constant expression}} \ 3198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 320cce06667447b5aec83452adb0c15100ada531095Dmitry Shmidt int g : (S*)(void*)(sptr) == sptr; // \ 3218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected-warning {{not integer constant expression}} \ 3221f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt expected-note {{cast from 'void *' is not allowed in a constant expression}} 3231f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt}; 3248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtextern char externalvar[]; 3268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// FIXME: This is not a constant expression; check we reject this and move this 3278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// test elsewhere. 3288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool constaddress = (void *)externalvar == (void *)0x4000UL; // expected-error {{must be initialized by a constant expression}} 3298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}} expected-warning {{unspecified}} 3301f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(0 != "foo", ""); 3311f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 3321f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt} 3331f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 3341f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtnamespace MaterializeTemporary { 3351f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 3361f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr int f(const int &r) { return r; } 3371f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr int n = f(1); 3381f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 3391f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr bool same(const int &a, const int &b) { return &a == &b; } 3401f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr bool sameTemporary(const int &n) { return same(n, n); } 3411f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 3421f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(n, ""); 3438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(!same(4, 4), ""); 3448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(same(n, n), ""); 3458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(sameTemporary(9), ""); 3464b9d52f502481b258fec743c03a5e957e5605afcDmitry Shmidt 3478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 3488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3491f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr int strcmp_ce(const char *p, const char *q) { 3501f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1); 3518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 352e0e48dc666fb14a7bb60264ca87463ba7bc1fe0bDmitry Shmidt 353e0e48dc666fb14a7bb60264ca87463ba7bc1fe0bDmitry Shmidtnamespace StringLiteral { 3548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// FIXME: Refactor this once we support constexpr templates. 3568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int MangleChars(const char *p) { 3578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return *p + 3 * (*p ? MangleChars(p+1) : 0); 3588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 3591f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr int MangleChars(const char16_t *p) { 3608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return *p + 3 * (*p ? MangleChars(p+1) : 0); 3611f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt} 3621f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr int MangleChars(const char32_t *p) { 363c2ebb4b85d69b65f552fee71ac68f44e8d87b39eDmitry Shmidt return *p + 3 * (*p ? MangleChars(p+1) : 0); 364c2ebb4b85d69b65f552fee71ac68f44e8d87b39eDmitry Shmidt} 365c2ebb4b85d69b65f552fee71ac68f44e8d87b39eDmitry Shmidt 3664b9d52f502481b258fec743c03a5e957e5605afcDmitry Shmidtstatic_assert(MangleChars("constexpr!") == 1768383, ""); 3674b9d52f502481b258fec743c03a5e957e5605afcDmitry Shmidtstatic_assert(MangleChars(u"constexpr!") == 1768383, ""); 3681f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(MangleChars(U"constexpr!") == 1768383, ""); 3691f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 3701f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr char c0 = "nought index"[0]; 3711f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr char c1 = "nice index"[10]; 372292b0c3a742226c295f8db76eaef9e90c90e7513Dmitry Shmidtconstexpr char c2 = "nasty index"[12]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is past the end}} 373292b0c3a742226c295f8db76eaef9e90c90e7513Dmitry Shmidtconstexpr char c3 = "negative index"[-1]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is before the beginning}} 3741f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr char c4 = ((char*)(int*)"no reinterpret_casts allowed")[14]; // expected-error {{must be initialized by a constant expression}} 3751f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 376b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtconstexpr const char *p = "test" + 2; 377b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtstatic_assert(*p == 's', ""); 378b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidt 379b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtconstexpr const char *max_iter(const char *a, const char *b) { 380b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidt return *a < *b ? b : a; 381b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidt} 382b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtconstexpr const char *max_element(const char *a, const char *b) { 383b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidt return (a+1 >= b) ? a : max_iter(a, max_element(a+1, b)); 384b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidt} 385b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidt 386b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtconstexpr const char *begin(const char (&arr)[45]) { return arr; } 387b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtconstexpr const char *end(const char (&arr)[45]) { return arr + 45; } 388b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidt 389b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtconstexpr char str[] = "the quick brown fox jumped over the lazy dog"; 390b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtconstexpr const char *max = max_element(begin(str), end(str)); 391b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidtstatic_assert(*max == 'z', ""); 3926e933c1e09094a8972ef1e782c57f8b3c55c91d0Dmitry Shmidtstatic_assert(max == str + 38, ""); 3931f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 3946e933c1e09094a8972ef1e782c57f8b3c55c91d0Dmitry Shmidtstatic_assert(strcmp_ce("hello world", "hello world") == 0, ""); 3956e933c1e09094a8972ef1e782c57f8b3c55c91d0Dmitry Shmidtstatic_assert(strcmp_ce("hello world", "hello clang") > 0, ""); 396292b0c3a742226c295f8db76eaef9e90c90e7513Dmitry Shmidtstatic_assert(strcmp_ce("constexpr", "test") < 0, ""); 397292b0c3a742226c295f8db76eaef9e90c90e7513Dmitry Shmidtstatic_assert(strcmp_ce("", " ") < 0, ""); 398b58836ed5520bf4b769f76ef7dcb802af8c900b8Dmitry Shmidt 399292b0c3a742226c295f8db76eaef9e90c90e7513Dmitry Shmidt} 4008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace Array { 4028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt// FIXME: Use templates for these once we support constexpr templates. 4044b9d52f502481b258fec743c03a5e957e5605afcDmitry Shmidtconstexpr int Sum(const int *begin, const int *end) { 4058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return begin == end ? 0 : *begin + Sum(begin+1, end); 4068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 407738a26e9e2087b0d43eba3534535632b27b49947Dmitry Shmidtconstexpr const int *begin(const int (&xs)[5]) { return xs; } 4087832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidtconstexpr const int *end(const int (&xs)[5]) { return xs + 5; } 4097832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidt 4108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int xs[] = { 1, 2, 3, 4, 5 }; 4118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int ys[] = { 5, 4, 3, 2, 1 }; 4128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int sum_xs = Sum(begin(xs), end(xs)); 4138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(sum_xs == 15, ""); 4141f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 4151f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr int ZipFoldR(int (*F)(int x, int y, int c), int n, 4161f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt const int *xs, const int *ys, int c) { 417b7b4d0ec07161a6d76c40ba7ef1306e82fbb7e15Dmitry Shmidt return n ? F( 418b7b4d0ec07161a6d76c40ba7ef1306e82fbb7e15Dmitry Shmidt *xs, // expected-note {{subexpression not valid}} 4191f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt *ys, 42034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt ZipFoldR(F, n-1, xs+1, ys+1, c)) // \ 42134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt expected-note {{in call to 'ZipFoldR(&SubMul, 2, &xs[4], &ys[4], 1)'}} \ 42234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt expected-note {{in call to 'ZipFoldR(&SubMul, 1, &xs[5], &ys[5], 1)'}} 42334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt : c; 42434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 42534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int MulAdd(int x, int y, int c) { return x * y + c; } 42634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int InnerProduct = ZipFoldR(MulAdd, 5, xs, ys, 0); 42734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(InnerProduct == 35, ""); 42834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 42934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int SubMul(int x, int y, int c) { return (x - y) * c; } 43034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int DiffProd = ZipFoldR(SubMul, 2, xs+3, ys+3, 1); 43134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(DiffProd == 8, ""); 43234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(ZipFoldR(SubMul, 3, xs+3, ys+3, 1), ""); // \ 43334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt expected-error {{constant expression}} \ 43434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt expected-note {{in call to 'ZipFoldR(&SubMul, 3, &xs[3], &ys[3], 1)'}} 43534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 43634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr const int *p = xs + 3; 43734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int xs4 = p[1]; // ok 43834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int xs5 = p[2]; // expected-error {{constant expression}} 43934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int xs0 = p[-3]; // ok 44034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int xs_1 = p[-4]; // expected-error {{constant expression}} 44134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 44234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int zs[2][2][2][2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 44334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(zs[0][0][0][0] == 1, ""); 44434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(zs[1][1][1][1] == 16, ""); 44534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 44634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert((&zs[0][0][0][2])[-1] == 2, ""); 44734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(**(**(zs + 1) + 1) == 11, ""); 44834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, ""); 44934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 45034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int fail(const int &p) { 45134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt return (&p)[64]; // expected-note {{subexpression}} 45234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 45334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(fail(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1)) == 11, ""); // \ 45434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtexpected-error {{static_assert expression is not an integral constant expression}} \ 45534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtexpected-note {{in call to 'fail(zs[1][0][1][0])'}} 45634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 45734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int arr[40] = { 1, 2, 3, [8] = 4 }; // expected-warning {{extension}} 45834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int SumNonzero(const int *p) { 45934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt return *p + (*p ? SumNonzero(p+1) : 0); 46034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 46134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int CountZero(const int *p, const int *q) { 46234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt return p == q ? 0 : (*p == 0) + CountZero(p+1, q); 46334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 46434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(SumNonzero(arr) == 6, ""); 46534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(CountZero(arr, arr + 40) == 36, ""); 46634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 46734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct ArrayElem { 46834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr ArrayElem() : n(0) {} 46934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt int n; 47034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int f() { return n; } 47134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt}; 47234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct ArrayRVal { 47334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr ArrayRVal() {} 47434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt ArrayElem elems[10]; 47534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt}; 47634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(ArrayRVal().elems[3].f() == 0, ""); 47734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 47834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 47934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 48034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtnamespace DependentValues { 48134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 48234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct I { int n; typedef I V[10]; }; 48334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry ShmidtI::V x, y; 48434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidttemplate<bool B> struct S { 48534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt int k; 48634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt void f() { 48734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt I::V &cells = B ? x : y; 48834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt I &i = cells[k]; 48934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt switch (i.n) {} 49034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt } 49134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt}; 49234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 49334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 49434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 49534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtnamespace Class { 49634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 49734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct A { constexpr A(int a, int b) : k(a + b) {} int k; }; 49834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int fn(const A &a) { return a.k; } 49934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(fn(A(4,5)) == 9, ""); 50034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 50134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}} 50234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct C { 50334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr C(C *this_) : m(42), n(this_->m) {} // ok 50434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt int m, n; 50534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt}; 50634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct D { 50734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt C c; 50834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr D() : c(&c) {} 50934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt}; 51034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(D().c.n == 42, ""); 51134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 51234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct E { 51334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr E() : p(&p) {} 51434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt void *p; 51534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt}; 51634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr const E &e1 = E(); // expected-error {{constant expression}} 51734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt// This is a constant expression if we elide the copy constructor call, and 51834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt// is not a constant expression if we don't! But we do, so it is. 51934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt// FIXME: The move constructor is not currently implicitly defined as constexpr. 52034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt// We notice this when evaluating an expression which uses it, but not when 52134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt// checking its initializer. 52234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr E e2 = E(); // unexpected-error {{constant expression}} 52334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(e2.p == &e2.p, ""); // unexpected-error {{constant expression}} unexpected-note {{subexpression}} 524fb79edc9df1f20461e90e478363d207348213d35Dmitry Shmidt// FIXME: We don't pass through the fact that 'this' is ::e3 when checking the 525fb79edc9df1f20461e90e478363d207348213d35Dmitry Shmidt// initializer of this declaration. 526fb79edc9df1f20461e90e478363d207348213d35Dmitry Shmidtconstexpr E e3; // unexpected-error {{constant expression}} 527fb79edc9df1f20461e90e478363d207348213d35Dmitry Shmidtstatic_assert(e3.p == &e3.p, ""); 528fb79edc9df1f20461e90e478363d207348213d35Dmitry Shmidt 52934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtextern const class F f; 53034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstruct F { 53134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr F() : p(&f.p) {} 53234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt const void *p; 53334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt}; 53434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr F f = F(); 53534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 53604f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidtstruct G { 53704f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt struct T { 53804f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt constexpr T(T *p) : u1(), u2(p) {} 53904f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt union U1 { 54004f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt constexpr U1() {} 54104f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt int a, b = 42; 54204f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt } u1; 54304f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt union U2 { 54404f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt constexpr U2(T *p) : c(p->u1.b) {} 54504f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt int c, d; 54604f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt } u2; 54704f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt } t; 54804f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt constexpr G() : t(&t) {} 54904f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt} constexpr g; 55004f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt 55104f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidtstatic_assert(g.t.u1.a == 42, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 55204f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidtstatic_assert(g.t.u1.b == 42, ""); 55304f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidtstatic_assert(g.t.u2.c == 42, ""); 55404f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidtstatic_assert(g.t.u2.d == 42, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 55504f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidt 55604f534e89ed127da4077485376f24debc50d80d5Dmitry Shmidtstruct S { 5571f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt int a, b; 5581f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt const S *p; 5597832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidt double d; 5607832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidt const char *q; 5611f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 5621f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {} 5631f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt}; 5641f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 5651f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry ShmidtS global(43, &global); 5667832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidt 5677832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidtstatic_assert(S(15, &global).b == 15, ""); 5681f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 5691f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr bool CheckS(const S &s) { 5701f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l'; 57134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 5721f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(CheckS(S(27, &global)), ""); 5737832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidt 5747832adbbd72a1b784b7fb74a71a5d4085b0cb0d3Dmitry Shmidtstruct Arr { 5751f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt char arr[3]; 5768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr Arr() : arr{'x', 'y', 'z'} {} 5778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 5788bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidtconstexpr int hash(Arr &&a) { 5798bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidt return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000; 5808bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidt} 5818bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidtconstexpr int k = hash(Arr()); 5828bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidtstatic_assert(k == 0x007a7978, ""); 5838bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidt 5848bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidt 5858bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidtstruct AggregateInit { 5868bae4138a0356709720a96f3e50b4d734e532c12Dmitry Shmidt const char &c; 58787fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinen int n; 58887fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinen double d; 58987fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinen int arr[5]; 59087fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinen void *p; 5916dc03bd757d3befd2c03a543a402338db03914d6Dmitry Shmidt}; 5921f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 59387fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinenconstexpr AggregateInit agg1 = { "hello"[0] }; 59487fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinen 59587fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinenstatic_assert(strcmp_ce(&agg1.c, "hello") == 0, ""); 59687fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinenstatic_assert(agg1.n == 0, ""); 59787fd279308af3f806848c8f2ab65ef18c6ac4c30Jouni Malinenstatic_assert(agg1.d == 0.0, ""); 5988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 5998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(agg1.arr[0] == 0, ""); 6008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(agg1.arr[4] == 0, ""); 6018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(agg1.arr[5] == 0, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 6028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(agg1.p == nullptr, ""); 6038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace SimpleDerivedClass { 6058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct B { 6078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr B(int n) : a(n) {} 6088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int a; 6098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 6108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct D : B { 6118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr D(int n) : B(n) {} 6128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 6138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr D d(3); 6148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(d.a == 3, ""); 6158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 6178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct Bottom { constexpr Bottom() {} }; 6198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct Base : Bottom { 6208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {} 6218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int a; 6228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const char *b; 6238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 6248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct Base2 : Bottom { 6258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr Base2(const int &r) : r(r) {} 6268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int q = 123; 6278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt // FIXME: When we track the global for which we are computing the initializer, 6281f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt // use a reference here. 6298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt //const int &r; 6308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int r; 6318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 6328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct Derived : Base, Base2 { 6338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr Derived() : Base(76), Base2(a) {} 6348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int c = r + b[1]; 6358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 6361f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 6378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr bool operator==(const Base &a, const Base &b) { 6388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return a.a == b.a && strcmp_ce(a.b, b.b) == 0; 6398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 6408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr Base base; 6428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr Base base2(76); 6438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr Derived derived; 6448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(derived.a == 76, ""); 6458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(derived.b[2] == 's', ""); 6468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(derived.c == 76 + 'e', ""); 6478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(derived.q == 123, ""); 6488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(derived.r == 76, ""); 6498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&derived.r == &derived.a, ""); // expected-error {{}} 6508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(!(derived == base), ""); 6528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(derived == base2, ""); 6538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 65468d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtconstexpr Bottom &bot1 = (Base&)derived; 65568d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtconstexpr Bottom &bot2 = (Base2&)derived; 656717574375e969e8272c6d1a26137286eac158abbDmitry Shmidtstatic_assert(&bot1 != &bot2, ""); 65768d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt 65868d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtconstexpr Bottom *pb1 = (Base*)&derived; 65968d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtconstexpr Bottom *pb2 = (Base2*)&derived; 66068d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtstatic_assert(pb1 != pb2, ""); 66168d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtstatic_assert(pb1 == &bot1, ""); 6628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(pb2 == &bot2, ""); 6638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr Base2 &fail = (Base2&)bot1; // expected-error {{constant expression}} 6658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr Base &fail2 = (Base&)*pb2; // expected-error {{constant expression}} 6668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr Base2 &ok2 = (Base2&)bot2; 6678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(&ok2 == &derived, ""); 6688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6691f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr Base2 *pfail = (Base2*)pb1; // expected-error {{constant expression}} 6701f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr Base *pfail2 = (Base*)&bot2; // expected-error {{constant expression}} 6711f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr Base2 *pok2 = (Base2*)pb2; 6721f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(pok2 == &derived, ""); 6731f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(&ok2 == pok2, ""); 6741f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert((Base2*)(Derived*)(Base*)pb1 == pok2, ""); 6751f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert((Derived*)(Base*)pb1 == (Derived*)pok2, ""); 6761f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 6771f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr Base *nullB = 42 - 6 * 7; 67804949598a23f501be6eec21697465fd46a28840aDmitry Shmidtstatic_assert((Bottom*)nullB == 0, ""); 679641185ebd73d9607756c87b22f6c520ab1846325Dmitry Shmidtstatic_assert((Derived*)nullB == 0, ""); 6808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert((void*)(Bottom*)nullB == (void*)(Derived*)nullB, ""); 6818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 6838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 6841f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtnamespace Temporaries { 6851f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 6868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct S { 6878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr S() {} 6888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int f(); 6898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 6908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct T : S { 6918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr T(int n) : S(), n(n) {} 6928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int n; 6938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 6948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int S::f() { 69534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt // 'this' must be the postfix-expression in a class member access expression, 69634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt // so we can't just use 69734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt // return static_cast<T*>(this)->n; 69834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt return this->*(int(S::*))&T::n; 69934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 70034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt// The T temporary is implicitly cast to an S subobject, but we can recover the 70134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt// T full-object via a base-to-derived cast, or a derived-to-base-casted member 70234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt// pointer. 70334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtstatic_assert(T(3).f() == 3, ""); 70434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 70534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtconstexpr int f(const S &s) { 70634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt return static_cast<const T&>(s).n; 70734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 7088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr int n = f(T(5)); 7098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(f(T(5)) == 5, ""); 7108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 7118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 7128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 7138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace Union { 7148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 7158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtunion U { 7168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int a; 7178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int b; 7188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 7198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 7208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtconstexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } }; // expected-warning 4{{extension}} 7218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(u[0].a == 0, ""); 7228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(u[0].b, ""); // expected-error {{constant expression}} 7238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(u[1].b == 1, ""); 7248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 7258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 7268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic_assert((&(u[1]) + 1 + 1)->b == 3, ""); 7278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 7288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 7298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 7308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtnamespace MemberPointer { 7318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct A { 7328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr A(int n) : n(n) {} 7338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int n; 7348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int f() { return n + 3; } 7358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt }; 7368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr A a(7); 7378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(A(5).*&A::n == 5, ""); 7388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert((&a)->*&A::n == 7, ""); 7391f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((A(8).*&A::f)() == 11, ""); 7408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(((&a)->*&A::f)() == 10, ""); 7418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 7428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct B : A { 7438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr B(int n, int m) : A(n), m(m) {} 7448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int m; 7458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr int g() { return n + m + 1; } 7468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt }; 7478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr B b(9, 13); 7488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(B(4, 11).*&A::n == 4, ""); 7491f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(B(4, 11).*&B::m == 11, ""); 7508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(B(4, 11).*(int(A::*))&B::m == 11, ""); 7518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert((&b)->*&A::n == 9, ""); 7528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert((&b)->*&B::m == 13, ""); 7531f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((&b)->*(int(A::*))&B::m == 13, ""); 7548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert((B(4, 11).*&A::f)() == 7, ""); 7558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert((B(4, 11).*&B::g)() == 16, ""); 7568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert((B(4, 11).*(int(A::*)()const)&B::g)() == 16, ""); 7578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(((&b)->*&A::f)() == 12, ""); 7588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(((&b)->*&B::g)() == 23, ""); 7598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt static_assert(((&b)->*(int(A::*)()const)&B::g)() == 23, ""); 7608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 7618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct S { 7628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt constexpr S(int m, int n, int (S::*pf)() const, int S::*pn) : 7638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt m(m), n(n), pf(pf), pn(pn) {} 7641f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr S() : m(), n(), pf(&S::f), pn(&S::n) {} 7651f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 7661f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int f() { return this->*pn; } 7671f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt virtual int g() const; 7681f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 7691f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt int m, n; 7701f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt int (S::*pf)() const; 7711f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt int S::*pn; 7721f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt }; 7731f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 77434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int S::*pm = &S::m; 77534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int S::*pn = &S::n; 7761f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int (S::*pf)() const = &S::f; 7771f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int (S::*pg)() const = &S::g; 7781f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 7791f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr S s(2, 5, &S::f, &S::m); 7801f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 7811f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((s.*&S::f)() == 2, ""); 7821f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert((s.*s.pf)() == 2, ""); 7831f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 7841f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt template<int n> struct T : T<n-1> {}; 7851f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt template<> struct T<0> { int n; }; 7861f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt template<> struct T<30> : T<29> { int m; }; 7871f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 7881f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt T<17> t17; 7891f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt T<30> t30; 7901f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 79134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int (T<10>::*deepn) = &T<0>::n; 79234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt static_assert(&(t17.*deepn) == &t17.n, ""); 79334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 79434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int (T<15>::*deepm) = (int(T<10>::*))&T<30>::m; 79534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int *pbad = &(t17.*deepm); // expected-error {{constant expression}} 79634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt static_assert(&(t30.*deepm) == &t30.m, ""); 79734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 7981f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr T<5> *p17_5 = &t17; 7991f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr T<13> *p17_13 = (T<13>*)p17_5; 8001f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr T<23> *p17_23 = (T<23>*)p17_13; // expected-error {{constant expression}} 8011f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(p17_5->*(int(T<3>::*))deepn) == &t17.n, ""); 8021f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(p17_13->*deepn) == &t17.n, ""); 8031f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int *pbad2 = &(p17_13->*(int(T<9>::*))deepm); // expected-error {{constant expression}} 8041f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 8051f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr T<5> *p30_5 = &t30; 8061f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr T<23> *p30_23 = (T<23>*)p30_5; 80734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr T<13> *p30_13 = p30_23; 8081f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(p30_5->*(int(T<3>::*))deepn) == &t30.n, ""); 8091f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(p30_13->*deepn) == &t30.n, ""); 8101f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(p30_23->*deepn) == &t30.n, ""); 8111f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(p30_5->*(int(T<2>::*))deepm) == &t30.m, ""); 81234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt static_assert(&(((T<17>*)p30_13)->*deepm) == &t30.m, ""); 8131f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(&(p30_23->*deepm) == &t30.m, ""); 8141f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt} 8151f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 81634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtnamespace ArrayBaseDerived { 81734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 8181f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct Base { 8191f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr Base() {} 8201f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt int n = 0; 8211f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt }; 8221f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct Derived : Base { 8231f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr Derived() {} 8241f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr const int *f() { return &n; } 8251f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt }; 8261f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 8271f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr Derived a[10]; 82834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Derived *pd3 = const_cast<Derived*>(&a[3]); 82934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Base *pb3 = const_cast<Derived*>(&a[3]); 83034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt static_assert(pb3 == pd3, ""); 83134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 83234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt // pb3 does not point to an array element. 83334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Base *pb4 = pb3 + 1; // ok, one-past-the-end pointer. 83434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int pb4n = pb4->n; // expected-error {{constant expression}} 83534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Base *err_pb5 = pb3 + 2; // FIXME: reject this. 83634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int err_pb5n = err_pb5->n; // expected-error {{constant expression}} 83734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Base *err_pb2 = pb3 - 1; // FIXME: reject this. 83834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int err_pb2n = err_pb2->n; // expected-error {{constant expression}} 83934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Base *pb3a = pb4 - 1; 84034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 84134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt // pb4 does not point to a Derived. 84234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Derived *err_pd4 = (Derived*)pb4; // expected-error {{constant expression}} 84334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Derived *pd3a = (Derived*)pb3a; 84434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int pd3n = pd3a->n; 84534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 84634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt // pd3a still points to the Derived array. 84734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Derived *pd6 = pd3a + 3; 84834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt static_assert(pd6 == &a[6], ""); 84934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Derived *pd9 = pd6 + 3; 85034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Derived *pd10 = pd6 + 4; 85134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int pd9n = pd9->n; // ok 85234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int err_pd10n = pd10->n; // expected-error {{constant expression}} 85334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int pd0n = pd10[-10].n; 85434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr int err_pdminus1n = pd10[-11].n; // expected-error {{constant expression}} 85534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 85634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr Base *pb9 = pd9; 85734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr const int *(Base::*pfb)() const = 85834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt static_cast<const int *(Base::*)() const>(&Derived::f); 85934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt static_assert((pb9->*pfb)() == &a[9].n, ""); 86034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt} 86134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 86234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtnamespace Complex { 86334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt 86434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtclass complex { 86534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt int re, im; 86634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidtpublic: 86734af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr complex(int re = 0, int im = 0) : re(re), im(im) {} 86834af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr complex(const complex &o) : re(o.re), im(o.im) {} 86934af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt constexpr complex operator-() const { return complex(-re, -im); } 87034af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt friend constexpr complex operator+(const complex &l, const complex &r) { 87134af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt return complex(l.re + r.re, l.im + r.im); 87234af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt } 87334af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt friend constexpr complex operator-(const complex &l, const complex &r) { 87434af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt return l + -r; 87534af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt } 87634af306c42b7ccf956508e7cd23f0ba90606e360Dmitry Shmidt friend constexpr complex operator*(const complex &l, const complex &r) { 8771f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return complex(l.re * r.re - l.im * r.im, l.re * r.im + l.im * r.re); 8781f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 8791f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt friend constexpr bool operator==(const complex &l, const complex &r) { 8801f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return l.re == r.re && l.im == r.im; 8811f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 8821f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr bool operator!=(const complex &r) const { 8831f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return re != r.re || im != r.im; 8841f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 8851f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int real() const { return re; } 8861f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr int imag() const { return im; } 8871f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt}; 8881f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 8891f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr complex i = complex(0, 1); 8901f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr complex k = (3 + 4*i) * (6 - 4*i); 8911f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(complex(1,0).real() == 1, ""); 8921f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(complex(1,0).imag() == 0, ""); 8931f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(((complex)1).imag() == 0, ""); 8941f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(k.real() == 34, ""); 8951f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(k.imag() == 12, ""); 8961f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(k - 34 == 12*i, ""); 8971f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert((complex)1 == complex(1), ""); 8981f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert((complex)1 != complex(0, 1), ""); 8991f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(complex(1) == complex(1), ""); 9001f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(complex(1) != complex(0, 1), ""); 9011f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtconstexpr complex makeComplex(int re, int im) { return complex(re, im); } 9021f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(makeComplex(1,0) == complex(1), ""); 9031f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(makeComplex(1,0) != complex(0, 1), ""); 9041f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 9051f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtclass complex_wrap : public complex { 9061f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtpublic: 9071f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr complex_wrap(int re, int im = 0) : complex(re, im) {} 9081f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt constexpr complex_wrap(const complex_wrap &o) : complex(o) {} 90968d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt}; 9101f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 911c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidtstatic_assert((complex_wrap)1 == complex(1), ""); 9121f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert((complex)1 != complex_wrap(0, 1), ""); 91368d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtstatic_assert(complex(1) == complex_wrap(1), ""); 914717574375e969e8272c6d1a26137286eac158abbDmitry Shmidtstatic_assert(complex_wrap(1) != complex(0, 1), ""); 91568d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidtconstexpr complex_wrap makeComplexWrap(int re, int im) { 91668d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt return complex_wrap(re, im); 91768d0e3ed07847339aedfac8e02f50db68c702e52Dmitry Shmidt} 9181f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(makeComplexWrap(1,0) == complex(1), ""); 9191f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtstatic_assert(makeComplexWrap(1,0) != complex(0, 1), ""); 9201f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 9211f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt} 9221f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 9231f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidtnamespace PR11595 { 9241f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct A { constexpr bool operator==(int x) { return true; } }; 9251f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct B { B(); ~B(); A& x; }; 9261f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt static_assert(B().x == 3, ""); // expected-error {{constant expression}} 9271f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt} 9281f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt