constant-expression-cxx11.cpp revision 974c5f93d0ce4f0699a6f0a4402f6b367da495e3
1c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 -pedantic %s -Wno-comment 259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StaticAssertFoldTest { 459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint x; 69eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(++x, "test"); // expected-error {{not an integral constant expression}} 79eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(false, "test"); // expected-error {{test}} 859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 1059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 111d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithtypedef decltype(sizeof(char)) size_t; 121d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smith 131d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithtemplate<typename T> constexpr T id(const T &t) { return t; } 141d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithtemplate<typename T> constexpr T min(const T &a, const T &b) { 151d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smith return a < b ? a : b; 161d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smith} 171d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithtemplate<typename T> constexpr T max(const T &a, const T &b) { 181d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smith return a < b ? b : a; 191d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smith} 201d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithtemplate<typename T, size_t N> constexpr T *begin(T (&xs)[N]) { return xs; } 211d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithtemplate<typename T, size_t N> constexpr T *end(T (&xs)[N]) { return xs + N; } 2259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct MemberZero { 2459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int zero() { return 0; } 2559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 2659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DerivedToVBaseCast { 2859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct U { int n; }; 3059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct V : U { int n; }; 3159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct A : virtual V { int n; }; 3259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Aa { int n; }; 3359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct B : virtual A, Aa {}; 3459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct C : virtual A, Aa {}; 3559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct D : B, C {}; 3659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith D d; 3859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B *p = &d; 3959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C *q = &d; 409eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((void*)p != (void*)q, ""); 419eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((A*)p == (A*)q, ""); 429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((Aa*)p != (Aa*)q, ""); 4359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 4459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B &pp = d; 4559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C &qq = d; 469eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((void*)&pp != (void*)&qq, ""); 479eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(A&)pp == &(A&)qq, ""); 489eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(Aa&)pp != &(Aa&)qq, ""); 4959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *v = p; 5159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *w = q; 5259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *x = (A*)p; 539eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(v == w, ""); 549eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(v == x, ""); 5559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 569eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == p, ""); 579eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == q, ""); 589eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == v, ""); 599eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == w, ""); 609eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == x, ""); 6159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 6259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct X {}; 6359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Y1 : virtual X {}; 6459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Y2 : X {}; 6559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Z : Y1, Y2 {}; 6659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Z z; 679eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((X*)(Y1*)&z != (X*)(Y2*)&z, ""); 6859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 6959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 7059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 71f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithnamespace ConstCast { 72f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 73f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n1 = 0; 74f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n2 = const_cast<int&>(n1); 75f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int *n3 = const_cast<int*>(&n1); 76f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n4 = *const_cast<int*>(&n1); 77f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr const int * const *n5 = const_cast<const int* const*>(&n3); 78f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int **n6 = const_cast<int**>(&n3); 79f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n7 = **n5; 80f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n8 = **n6; 81f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 82f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith} 83f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 8459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace TemplateArgumentConversion { 8559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith template<int n> struct IntParam {}; 8659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 8759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith using IntParam0 = IntParam<0>; 881d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smith using IntParam0 = IntParam<id(0)>; 8959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith using IntParam0 = IntParam<MemberZero().zero>; // expected-error {{did you mean to call it with no arguments?}} expected-error {{not an integral constant expression}} 9059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 9159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 9259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace CaseStatements { 9359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void f(int n) { 9459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (n) { 9559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: Produce the 'add ()' fixit for this. 96c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 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>'}} 971d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smith case id(1): 9859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return; 9959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 10059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 10159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 10259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 10359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern int &Recurse1; 104099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithint &Recurse2 = Recurse1; // expected-note 2{{declared here}} expected-note {{initializer of 'Recurse1' is not a constant expression}} 105099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithint &Recurse1 = Recurse2; // expected-note {{declared here}} expected-note {{initializer of 'Recurse2' is not a constant expression}} 106099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconstexpr int &Recurse3 = Recurse2; // expected-error {{must be initialized by a constant expression}} expected-note {{initializer of 'Recurse2' is not a constant expression}} 107099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 108099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithextern const int RecurseA; 109099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconst int RecurseB = RecurseA; // expected-note {{declared here}} 110099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconst int RecurseA = 10; 111099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconstexpr int RecurseC = RecurseB; // expected-error {{must be initialized by a constant expression}} expected-note {{initializer of 'RecurseB' is not a constant expression}} 11259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 11359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace MemberEnum { 11459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct WithMemberEnum { 11559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith enum E { A = 42 }; 11659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } wme; 11759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1189eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(wme.A == 42, ""); 11959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 12059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 12159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DefaultArguments { 12259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 12359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconst int z = int(); 12459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int Sum(int a = 0, const int &b = 0, const int *c = &z, char d = 0) { 12559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a + b + *c + d; 12659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 12759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconst int four = 4; 12859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int eight = 8; 12959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int twentyseven = 27; 1309eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum() == 0, ""); 1319eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum(1) == 1, ""); 1329eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum(1, four) == 5, ""); 1339eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum(1, eight, &twentyseven) == 36, ""); 1349eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum(1, 2, &four, eight) == 15, ""); 13559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 13659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 13759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 13859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Ellipsis { 13959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 14059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// Note, values passed through an ellipsis can't actually be used. 14159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int F(int a, ...) { return a; } 1429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(F(0) == 0, ""); 1439eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(F(1, 0) == 1, ""); 1449eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(F(2, "test") == 2, ""); 1459eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(F(3, &F) == 3, ""); 1467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithint k = 0; // expected-note {{here}} 1477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstatic_assert(F(4, k) == 3, ""); // expected-error {{constant expression}} expected-note {{read of non-const variable 'k'}} 14859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 14959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 15059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 15159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Recursion { 15259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int fib(int n) { return n > 1 ? fib(n-1) + fib(n-2) : n; } 1539eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(fib(11) == 89, ""); 15459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 15559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int gcd_inner(int a, int b) { 15659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return b == 0 ? a : gcd_inner(b, a % b); 15759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 15859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int gcd(int a, int b) { 15959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return gcd_inner(max(a, b), min(a, b)); 16059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 16159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1629eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(gcd(1749237, 5628959) == 7, ""); 16359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 16459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 16559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace FunctionCast { 16659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // When folding, we allow functions to be cast to different types. Such 16759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // cast functions cannot be called, even if they're constexpr. 16859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int f() { return 1; } 16959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith typedef double (*DoubleFn)(); 17059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith typedef int (*IntFn)(); 171c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int a[(int)DoubleFn(f)()]; // expected-error {{variable length array}} expected-warning{{extension}} 17259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int b[(int)IntFn(f)()]; // ok 17359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 17459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 17559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StaticMemberFunction { 17659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct S { 17759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static constexpr int k = 42; 17859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static constexpr int f(int n) { return n * k + 2; } 17959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } s; 18059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 18159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int n = s.f(19); 1829eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(S::f(19) == 800, ""); 1839eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(s.f(19) == 800, ""); 1849eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(n == 800, ""); 1851bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 1861bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr int (*sf1)(int) = &S::f; 1871bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr int (*sf2)(int) = &s.f; 1881bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr const int *sk = &s.k; 18959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 19059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 19159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace ParameterScopes { 19259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 19359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int k = 42; 194099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr const int &ObscureTheTruth(const int &a) { return a; } // expected-note 3{{reference to 'a' cannot be returned from a constexpr function}} 195099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr const int &MaybeReturnJunk(bool b, const int a) { // expected-note 2{{declared here}} 196099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ObscureTheTruth(b ? a : k); // expected-note 2{{in call to 'ObscureTheTruth(a)'}} 19759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 1989eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(MaybeReturnJunk(false, 0) == 42, ""); // ok 199099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr int a = MaybeReturnJunk(true, 0); // expected-error {{constant expression}} expected-note {{in call to 'MaybeReturnJunk(1, 0)'}} 20059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 201099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr const int MaybeReturnNonstaticRef(bool b, const int a) { // expected-note {{here}} 20259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // If ObscureTheTruth returns a reference to 'a', the result is not a 20359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // constant expression even though 'a' is still in scope. 204099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ObscureTheTruth(b ? a : k); // expected-note {{in call to 'ObscureTheTruth(a)'}} 20559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2069eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(MaybeReturnNonstaticRef(false, 0) == 42, ""); // ok 207099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr int b = MaybeReturnNonstaticRef(true, 0); // expected-error {{constant expression}} expected-note {{in call to 'MaybeReturnNonstaticRef(1, 0)'}} 20859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 20959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int InternalReturnJunk(int n) { 21059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: We should reject this: it never produces a constant expression. 211099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return MaybeReturnJunk(true, n); // expected-note {{in call to 'MaybeReturnJunk(1, 0)'}} 21259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 213099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr int n3 = InternalReturnJunk(0); // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'InternalReturnJunk(0)'}} 21459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 21559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int LToR(int &n) { return n; } 21659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int GrabCallersArgument(bool which, int a, int b) { 21759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return LToR(which ? b : a); 21859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2199eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(GrabCallersArgument(false, 1, 2) == 1, ""); 2209eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(GrabCallersArgument(true, 4, 8) == 8, ""); 22159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 22359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Pointers { 22559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int f(int n, const int *a, const int *b, const int *c) { 22759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return n == 0 ? 0 : *a + f(n-1, b, c, a); 22859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 22959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int x = 1, y = 10, z = 100; 2319eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(f(23, &x, &y, &z) == 788, ""); 23259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int g(int n, int a, int b, int c) { 23459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return f(n, &a, &b, &c); 23559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2369eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(g(23, x, y, z) == 788, ""); 23759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 23959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 24059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace FunctionPointers { 24159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 24259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Double(int n) { return 2 * n; } 24359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Triple(int n) { return 3 * n; } 24459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Twice(int (*F)(int), int n) { return F(F(n)); } 24559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Quadruple(int n) { return Twice(Double, n); } 24659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr auto Select(int n) -> int (*)(int) { 24759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0; 24859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 249099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr int Apply(int (*F)(int), int n) { return F(n); } // expected-note {{subexpression}} 25059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2519eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, ""); 25259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 253099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr int Invalid = Apply(Select(0), 0); // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'Apply(0, 0)'}} 25459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 25659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace PointerComparison { 25859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint x, y; 2609eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x == &y, "false"); // expected-error {{false}} 2619eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x != &y, ""); 26259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g1 = &x == &y; 26359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g2 = &x != &y; 26459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g3 = &x <= &y; // expected-error {{must be initialized by a constant expression}} 26559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g4 = &x >= &y; // expected-error {{must be initialized by a constant expression}} 26659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g5 = &x < &y; // expected-error {{must be initialized by a constant expression}} 26759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g6 = &x > &y; // expected-error {{must be initialized by a constant expression}} 26859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 26959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct S { int x, y; } s; 2709eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x == &s.y, "false"); // expected-error {{false}} 2719eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x != &s.y, ""); 2729eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x <= &s.y, ""); 2739eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x >= &s.y, "false"); // expected-error {{false}} 2749eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x < &s.y, ""); 2759eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x > &s.y, "false"); // expected-error {{false}} 2769eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith 2779eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(0 == &y, "false"); // expected-error {{false}} 2789eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(0 != &y, ""); 27959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n3 = 0 <= &y; // expected-error {{must be initialized by a constant expression}} 28059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n4 = 0 >= &y; // expected-error {{must be initialized by a constant expression}} 28159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n5 = 0 < &y; // expected-error {{must be initialized by a constant expression}} 28259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n6 = 0 > &y; // expected-error {{must be initialized by a constant expression}} 28359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2849eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x == 0, "false"); // expected-error {{false}} 2859eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x != 0, ""); 28659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n9 = &x <= 0; // expected-error {{must be initialized by a constant expression}} 28759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n10 = &x >= 0; // expected-error {{must be initialized by a constant expression}} 28859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n11 = &x < 0; // expected-error {{must be initialized by a constant expression}} 28959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n12 = &x > 0; // expected-error {{must be initialized by a constant expression}} 29059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2919eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x == &x, ""); 2929eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x != &x, "false"); // expected-error {{false}} 2939eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x <= &x, ""); 2949eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x >= &x, ""); 2959eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x < &x, "false"); // expected-error {{false}} 2969eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x > &x, "false"); // expected-error {{false}} 29759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 29859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr S* sptr = &s; 299099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconstexpr bool dyncast = sptr == dynamic_cast<S*>(sptr); // expected-error {{constant expression}} expected-note {{dynamic_cast}} 30059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 301c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smithstruct Str { 302c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // FIXME: In C++ mode, we should say 'integral' not 'integer' 303c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int a : dynamic_cast<S*>(sptr) == dynamic_cast<S*>(sptr); // \ 304c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 3054cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith expected-note {{dynamic_cast is not allowed in a constant expression}} 306c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int b : reinterpret_cast<S*>(sptr) == reinterpret_cast<S*>(sptr); // \ 307c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 3084cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith expected-note {{reinterpret_cast is not allowed in a constant expression}} 309c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int c : (S*)(long)(sptr) == (S*)(long)(sptr); // \ 310c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 31160f24e781484250d3602261477d16321db7a157bRichard Smith expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 312c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int d : (S*)(42) == (S*)(42); // \ 313c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 31460f24e781484250d3602261477d16321db7a157bRichard Smith expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 315c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int e : (Str*)(sptr) == (Str*)(sptr); // \ 316c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 31760f24e781484250d3602261477d16321db7a157bRichard Smith expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 318c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int f : &(Str&)(*sptr) == &(Str&)(*sptr); // \ 319c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 32060f24e781484250d3602261477d16321db7a157bRichard Smith expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 321c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int g : (S*)(void*)(sptr) == sptr; // \ 322c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 3234cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith expected-note {{cast from 'void *' is not allowed in a constant expression}} 324c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith}; 325c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 32659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern char externalvar[]; 3279eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithconstexpr bool constaddress = (void *)externalvar == (void *)0x4000UL; // expected-error {{must be initialized by a constant expression}} 32859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}} expected-warning {{unspecified}} 3299eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(0 != "foo", ""); 33059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 33259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace MaterializeTemporary { 33459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int f(const int &r) { return r; } 33659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int n = f(1); 33759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool same(const int &a, const int &b) { return &a == &b; } 33959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool sameTemporary(const int &n) { return same(n, n); } 34059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3419eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(n, ""); 3429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(!same(4, 4), ""); 3439eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(same(n, n), ""); 3449eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(sameTemporary(9), ""); 34559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 34659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 34759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 34859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int strcmp_ce(const char *p, const char *q) { 34959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1); 35059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 35159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 35259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StringLiteral { 35359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3541d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithtemplate<typename Char> 3551d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithconstexpr int MangleChars(const Char *p) { 35659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + 3 * (*p ? MangleChars(p+1) : 0); 35759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 35859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3599eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(MangleChars("constexpr!") == 1768383, ""); 3609eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(MangleChars(u"constexpr!") == 1768383, ""); 3619eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(MangleChars(U"constexpr!") == 1768383, ""); 36259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 36359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c0 = "nought index"[0]; 36459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c1 = "nice index"[10]; 3657098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithconstexpr 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}} 3667098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith// FIXME: block the pointer arithmetic with undefined behavior here 3677098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithconstexpr char c3 = "negative index"[-1]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is before the beginning}} expected-note {{read of dereferenced one-past-the-end pointer}} 36859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c4 = ((char*)(int*)"no reinterpret_casts allowed")[14]; // expected-error {{must be initialized by a constant expression}} 36959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 37059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *p = "test" + 2; 3719eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(*p == 's', ""); 37259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 37359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max_iter(const char *a, const char *b) { 37459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *a < *b ? b : a; 37559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 37659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max_element(const char *a, const char *b) { 37759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return (a+1 >= b) ? a : max_iter(a, max_element(a+1, b)); 37859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 37959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 38059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char str[] = "the quick brown fox jumped over the lazy dog"; 38159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max = max_element(begin(str), end(str)); 3829eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(*max == 'z', ""); 3839eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(max == str + 38, ""); 38459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3859eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce("hello world", "hello world") == 0, ""); 3869eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce("hello world", "hello clang") > 0, ""); 3879eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce("constexpr", "test") < 0, ""); 3889eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce("", " ") < 0, ""); 38959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstruct S { 3917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 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}} 3927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith}; 3937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 394974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithstruct T { 395974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith char c[6]; 396974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith constexpr T() : c{"foo"} {} 397974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith}; 398974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithconstexpr T t; 399974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 400974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithstatic_assert(t.c[0] == 'f', ""); 401974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithstatic_assert(t.c[1] == 'o', ""); 402974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithstatic_assert(t.c[2] == 'o', ""); 403974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithstatic_assert(t.c[3] == 0, ""); 404974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithstatic_assert(t.c[4] == 0, ""); 405974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithstatic_assert(t.c[5] == 0, ""); 406974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smithstatic_assert(t.c[6] == 0, ""); // expected-error {{constant expression}} expected-note {{one-past-the-end}} 407974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 40859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 40959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 41059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Array { 41159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 4121d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithtemplate<typename Iter> 4131d238ea926bbdd04356ce475934fcd4cac654c4bRichard Smithconstexpr auto Sum(Iter begin, Iter end) -> decltype(+*begin) { 41459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return begin == end ? 0 : *begin + Sum(begin+1, end); 41559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 41659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 41759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs[] = { 1, 2, 3, 4, 5 }; 41859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int ys[] = { 5, 4, 3, 2, 1 }; 41959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int sum_xs = Sum(begin(xs), end(xs)); 4209eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(sum_xs == 15, ""); 42159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 42259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int ZipFoldR(int (*F)(int x, int y, int c), int n, 42359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int *xs, const int *ys, int c) { 424daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smith return n ? F( 4257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith *xs, // expected-note {{read of dereferenced one-past-the-end pointer}} 42608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith *ys, 42708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ZipFoldR(F, n-1, xs+1, ys+1, c)) // \ 42808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith expected-note {{in call to 'ZipFoldR(&SubMul, 2, &xs[4], &ys[4], 1)'}} \ 42908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith expected-note {{in call to 'ZipFoldR(&SubMul, 1, &xs[5], &ys[5], 1)'}} 43008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : c; 43159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 43259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MulAdd(int x, int y, int c) { return x * y + c; } 43359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int InnerProduct = ZipFoldR(MulAdd, 5, xs, ys, 0); 4349eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(InnerProduct == 35, ""); 43559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 43659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int SubMul(int x, int y, int c) { return (x - y) * c; } 43759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int DiffProd = ZipFoldR(SubMul, 2, xs+3, ys+3, 1); 4389eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(DiffProd == 8, ""); 43908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic_assert(ZipFoldR(SubMul, 3, xs+3, ys+3, 1), ""); // \ 44008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith expected-error {{constant expression}} \ 44108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith expected-note {{in call to 'ZipFoldR(&SubMul, 3, &xs[3], &ys[3], 1)'}} 44259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 44359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int *p = xs + 3; 44459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs4 = p[1]; // ok 4457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithconstexpr int xs5 = p[2]; // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 44659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs0 = p[-3]; // ok 4477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith// FIXME: check pointer arithmetic here 4487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithconstexpr int xs_1 = p[-4]; // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 44959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 45059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int zs[2][2][2][2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 4519eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(zs[0][0][0][0] == 1, ""); 4529eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(zs[1][1][1][1] == 16, ""); 4537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstatic_assert(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 4549eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((&zs[0][0][0][2])[-1] == 2, ""); 4559eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(**(**(zs + 1) + 1) == 11, ""); 4569eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, ""); 45759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 45808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithconstexpr int fail(const int &p) { 4597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return (&p)[64]; // expected-note {{read of dereferenced one-past-the-end pointer}} 46008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 46108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic_assert(fail(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1)) == 11, ""); // \ 46208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithexpected-error {{static_assert expression is not an integral constant expression}} \ 46308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithexpected-note {{in call to 'fail(zs[1][0][1][0])'}} 46408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 465c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smithconstexpr int arr[40] = { 1, 2, 3, [8] = 4 }; // expected-warning {{extension}} 46659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int SumNonzero(const int *p) { 46759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + (*p ? SumNonzero(p+1) : 0); 46859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 46959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int CountZero(const int *p, const int *q) { 47059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return p == q ? 0 : (*p == 0) + CountZero(p+1, q); 47159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 4729eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(SumNonzero(arr) == 6, ""); 4739eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(CountZero(arr, arr + 40) == 36, ""); 47459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 475e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct ArrayElem { 476e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr ArrayElem() : n(0) {} 477e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int n; 478e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int f() { return n; } 479e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 480e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct ArrayRVal { 481e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr ArrayRVal() {} 482e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayElem elems[10]; 483e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 4849eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(ArrayRVal().elems[3].f() == 0, ""); 485e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 48659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 48759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 48859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DependentValues { 48959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 49059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct I { int n; typedef I V[10]; }; 49159efe266b804330f4c1f3a1b0ff783e67dd90378Richard SmithI::V x, y; 49259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithtemplate<bool B> struct S { 49359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int k; 49459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void f() { 49559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith I::V &cells = B ? x : y; 49659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith I &i = cells[k]; 49759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (i.n) {} 49859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 49959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 50059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 50159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 50259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 50359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Class { 50459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 50559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct A { constexpr A(int a, int b) : k(a + b) {} int k; }; 50659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int fn(const A &a) { return a.k; } 5079eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(fn(A(4,5)) == 9, ""); 50859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 50959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}} 51059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct C { 51159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C(C *this_) : m(42), n(this_->m) {} // ok 51259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int m, n; 51359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 51459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct D { 51559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith C c; 51659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr D() : c(&c) {} 51759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 5189eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(D().c.n == 42, ""); 51959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 520099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithstruct E { // expected-note {{here}} 521099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith constexpr E() : p(&p) {} // expected-note {{pointer to temporary cannot be used to initialize a member in a constant expression}} 52259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void *p; 52359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 524099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconstexpr const E &e1 = E(); // expected-error {{constant expression}} expected-note {{in call to 'E()'}} expected-note {{temporary created here}} 52559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// This is a constant expression if we elide the copy constructor call, and 52659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// is not a constant expression if we don't! But we do, so it is. 52759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: The move constructor is not currently implicitly defined as constexpr. 528099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconstexpr E e2 = E(); // unexpected-error {{constant expression}} unexpected-note {{here}} unexpected-note {{non-constexpr constructor 'E' cannot be used in a constant expression}} 529099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithstatic_assert(e2.p == &e2.p, ""); // unexpected-error {{constant expression}} unexpected-note {{initializer of 'e2' is not a constant expression}} 530099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconstexpr E e3; 5319eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(e3.p == &e3.p, ""); 53259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 53359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern const class F f; 53459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct F { 53559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr F() : p(&f.p) {} 53659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const void *p; 53759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 538099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithconstexpr F f; 53959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 54059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct G { 54159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct T { 54259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr T(T *p) : u1(), u2(p) {} 54359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith union U1 { 54459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr U1() {} 54559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a, b = 42; 54659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } u1; 54759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith union U2 { 54859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr U2(T *p) : c(p->u1.b) {} 54959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int c, d; 55059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } u2; 55159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } t; 55259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr G() : t(&t) {} 55359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} constexpr g; 55459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstatic_assert(g.t.u1.a == 42, ""); // expected-error {{constant expression}} expected-note {{read of member 'a' of union with active member 'b'}} 5569eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(g.t.u1.b == 42, ""); 5579eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(g.t.u2.c == 42, ""); 5587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstatic_assert(g.t.u2.d == 42, ""); // expected-error {{constant expression}} expected-note {{read of member 'd' of union with active member 'c'}} 55959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 56059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct S { 56159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a, b; 56259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const S *p; 56359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith double d; 56459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char *q; 56559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 56659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {} 56759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 56859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 56959efe266b804330f4c1f3a1b0ff783e67dd90378Richard SmithS global(43, &global); 57059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5719eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(S(15, &global).b == 15, ""); 57259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 57359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool CheckS(const S &s) { 57459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l'; 57559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 5769eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(CheckS(S(27, &global)), ""); 57759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 57859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct Arr { 57959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith char arr[3]; 58059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Arr() : arr{'x', 'y', 'z'} {} 58159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 58259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int hash(Arr &&a) { 58359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000; 58459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 58559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int k = hash(Arr()); 5869eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(k == 0x007a7978, ""); 58759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 58859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 58959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct AggregateInit { 59059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char &c; 59159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int n; 59259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith double d; 59359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int arr[5]; 59459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void *p; 59559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 59659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 59759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr AggregateInit agg1 = { "hello"[0] }; 59859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5999eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce(&agg1.c, "hello") == 0, ""); 6009eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.n == 0, ""); 6019eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.d == 0.0, ""); 6027098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith// FIXME: check pointer arithmetic here. 6037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstatic_assert(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end}} 6049eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.arr[0] == 0, ""); 6059eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.arr[4] == 0, ""); 6067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstatic_assert(agg1.arr[5] == 0, ""); // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end}} 6079eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.p == nullptr, ""); 60859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 60959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace SimpleDerivedClass { 61059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 61159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct B { 61259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B(int n) : a(n) {} 61359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 61459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 61559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct D : B { 61659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr D(int n) : B(n) {} 61759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 61859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr D d(3); 6199eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(d.a == 3, ""); 62059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 62159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 62259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 623e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct Bottom { constexpr Bottom() {} }; 624e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct Base : Bottom { 62559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {} 62659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 62759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char *b; 62859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 629e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct Base2 : Bottom { 63059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Base2(const int &r) : r(r) {} 63159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int q = 123; 632099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const int &r; 63359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 63459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct Derived : Base, Base2 { 63559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Derived() : Base(76), Base2(a) {} 63659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int c = r + b[1]; 63759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 63859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 63959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool operator==(const Base &a, const Base &b) { 64059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a.a == b.a && strcmp_ce(a.b, b.b) == 0; 64159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 64259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 64359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Base base; 64459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Base base2(76); 64559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Derived derived; 6469eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.a == 76, ""); 6479eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.b[2] == 's', ""); 6489eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.c == 76 + 'e', ""); 6499eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.q == 123, ""); 6509eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.r == 76, ""); 651099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithstatic_assert(&derived.r == &derived.a, ""); 65259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 6539eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(!(derived == base), ""); 6549eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived == base2, ""); 65559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Bottom &bot1 = (Base&)derived; 657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Bottom &bot2 = (Base2&)derived; 6589eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&bot1 != &bot2, ""); 659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Bottom *pb1 = (Base*)&derived; 661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Bottom *pb2 = (Base2*)&derived; 6629eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(pb1 != pb2, ""); 6639eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(pb1 == &bot1, ""); 6649eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(pb2 == &bot2, ""); 665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base2 &fail = (Base2&)bot1; // expected-error {{constant expression}} 667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base &fail2 = (Base&)*pb2; // expected-error {{constant expression}} 668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base2 &ok2 = (Base2&)bot2; 6699eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&ok2 == &derived, ""); 670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base2 *pfail = (Base2*)pb1; // expected-error {{constant expression}} 672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base *pfail2 = (Base*)&bot2; // expected-error {{constant expression}} 673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base2 *pok2 = (Base2*)pb2; 6749eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(pok2 == &derived, ""); 6759eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&ok2 == pok2, ""); 6769eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((Base2*)(Derived*)(Base*)pb1 == pok2, ""); 6779eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((Derived*)(Base*)pb1 == (Derived*)pok2, ""); 678e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 679e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base *nullB = 42 - 6 * 7; 6809eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((Bottom*)nullB == 0, ""); 6819eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((Derived*)nullB == 0, ""); 6829eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((void*)(Bottom*)nullB == (void*)(Derived*)nullB, ""); 683e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 684e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 685e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 686e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace Temporaries { 687e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 688e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct S { 689e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr S() {} 690e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int f(); 691e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 692e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct T : S { 693e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T(int n) : S(), n(n) {} 694e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int n; 695e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 696e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr int S::f() { 697e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // 'this' must be the postfix-expression in a class member access expression, 698e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // so we can't just use 699e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // return static_cast<T*>(this)->n; 700e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return this->*(int(S::*))&T::n; 701e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 702e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// The T temporary is implicitly cast to an S subobject, but we can recover the 703e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// T full-object via a base-to-derived cast, or a derived-to-base-casted member 704e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// pointer. 7059eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(T(3).f() == 3, ""); 706e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 707e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr int f(const S &s) { 708e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return static_cast<const T&>(s).n; 709e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 710e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr int n = f(T(5)); 7119eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(f(T(5)) == 5, ""); 712e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 71359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 71459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 71559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Union { 71659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 71759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithunion U { 71859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 71959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int b; 72059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 72159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 722c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smithconstexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } }; // expected-warning 4{{extension}} 7239eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(u[0].a == 0, ""); 7247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstatic_assert(u[0].b, ""); // expected-error {{constant expression}} expected-note {{read of member 'b' of union with active member 'a'}} 7259eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(u[1].b == 1, ""); 7267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstatic_assert((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 727daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 7289eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((&(u[1]) + 1 + 1)->b == 3, ""); 72959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 73059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 73159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace MemberPointer { 733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct A { 734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr A(int n) : n(n) {} 735e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int n; 736e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int f() { return n + 3; } 737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr A a(7); 7399eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(A(5).*&A::n == 5, ""); 7409eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((&a)->*&A::n == 7, ""); 7419eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((A(8).*&A::f)() == 11, ""); 7429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(((&a)->*&A::f)() == 10, ""); 743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct B : A { 745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr B(int n, int m) : A(n), m(m) {} 746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int m; 747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int g() { return n + m + 1; } 748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr B b(9, 13); 7509eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(B(4, 11).*&A::n == 4, ""); 7519eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(B(4, 11).*&B::m == 11, ""); 7529eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(B(4, 11).*(int(A::*))&B::m == 11, ""); 7539eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((&b)->*&A::n == 9, ""); 7549eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((&b)->*&B::m == 13, ""); 7559eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((&b)->*(int(A::*))&B::m == 13, ""); 7569eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((B(4, 11).*&A::f)() == 7, ""); 7579eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((B(4, 11).*&B::g)() == 16, ""); 7589eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((B(4, 11).*(int(A::*)()const)&B::g)() == 16, ""); 7599eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(((&b)->*&A::f)() == 12, ""); 7609eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(((&b)->*&B::g)() == 23, ""); 7619eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(((&b)->*(int(A::*)()const)&B::g)() == 23, ""); 762e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 763e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct S { 764e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr S(int m, int n, int (S::*pf)() const, int S::*pn) : 765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith m(m), n(n), pf(pf), pn(pn) {} 766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr S() : m(), n(), pf(&S::f), pn(&S::n) {} 767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int f() { return this->*pn; } 769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith virtual int g() const; 770e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 771e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int m, n; 772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int (S::*pf)() const; 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int S::*pn; 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int S::*pm = &S::m; 777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int S::*pn = &S::n; 778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int (S::*pf)() const = &S::f; 779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int (S::*pg)() const = &S::g; 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr S s(2, 5, &S::f, &S::m); 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 7839eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((s.*&S::f)() == 2, ""); 7849eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((s.*s.pf)() == 2, ""); 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith template<int n> struct T : T<n-1> {}; 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith template<> struct T<0> { int n; }; 788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith template<> struct T<30> : T<29> { int m; }; 789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith T<17> t17; 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith T<30> t30; 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int (T<10>::*deepn) = &T<0>::n; 7949eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(t17.*deepn) == &t17.n, ""); 795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int (T<15>::*deepm) = (int(T<10>::*))&T<30>::m; 797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int *pbad = &(t17.*deepm); // expected-error {{constant expression}} 7989eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(t30.*deepm) == &t30.m, ""); 799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<5> *p17_5 = &t17; 801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<13> *p17_13 = (T<13>*)p17_5; 802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<23> *p17_23 = (T<23>*)p17_13; // expected-error {{constant expression}} 8039eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p17_5->*(int(T<3>::*))deepn) == &t17.n, ""); 8049eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p17_13->*deepn) == &t17.n, ""); 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int *pbad2 = &(p17_13->*(int(T<9>::*))deepm); // expected-error {{constant expression}} 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<5> *p30_5 = &t30; 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<23> *p30_23 = (T<23>*)p30_5; 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<13> *p30_13 = p30_23; 8109eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_5->*(int(T<3>::*))deepn) == &t30.n, ""); 8119eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_13->*deepn) == &t30.n, ""); 8129eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_23->*deepn) == &t30.n, ""); 8139eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_5->*(int(T<2>::*))deepm) == &t30.m, ""); 8149eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(((T<17>*)p30_13)->*deepm) == &t30.m, ""); 8159eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_23->*deepm) == &t30.m, ""); 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace ArrayBaseDerived { 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct Base { 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base() {} 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int n = 0; 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct Derived : Base { 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived() {} 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr const int *f() { return &n; } 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived a[10]; 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd3 = const_cast<Derived*>(&a[3]); 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *pb3 = const_cast<Derived*>(&a[3]); 8329eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(pb3 == pd3, ""); 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // pb3 does not point to an array element. 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *pb4 = pb3 + 1; // ok, one-past-the-end pointer. 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int pb4n = pb4->n; // expected-error {{constant expression}} 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *err_pb5 = pb3 + 2; // FIXME: reject this. 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int err_pb5n = err_pb5->n; // expected-error {{constant expression}} 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *err_pb2 = pb3 - 1; // FIXME: reject this. 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int err_pb2n = err_pb2->n; // expected-error {{constant expression}} 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *pb3a = pb4 - 1; 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // pb4 does not point to a Derived. 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *err_pd4 = (Derived*)pb4; // expected-error {{constant expression}} 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd3a = (Derived*)pb3a; 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int pd3n = pd3a->n; 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // pd3a still points to the Derived array. 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd6 = pd3a + 3; 8509eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(pd6 == &a[6], ""); 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd9 = pd6 + 3; 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd10 = pd6 + 4; 853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int pd9n = pd9->n; // ok 8547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith constexpr int err_pd10n = pd10->n; // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int pd0n = pd10[-10].n; 8567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: check pointer arithmetic here. 8577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith constexpr int err_pdminus1n = pd10[-11].n; // expected-error {{constant expression}} expected-note {{read of dereferenced one-past-the-end pointer}} 858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *pb9 = pd9; 860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr const int *(Base::*pfb)() const = 861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith static_cast<const int *(Base::*)() const>(&Derived::f); 8629eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((pb9->*pfb)() == &a[9].n, ""); 863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 86559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Complex { 86659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 86759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithclass complex { 86859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int re, im; 86959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithpublic: 87059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex(int re = 0, int im = 0) : re(re), im(im) {} 87159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex(const complex &o) : re(o.re), im(o.im) {} 87259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex operator-() const { return complex(-re, -im); } 87359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator+(const complex &l, const complex &r) { 87459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex(l.re + r.re, l.im + r.im); 87559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 87659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator-(const complex &l, const complex &r) { 87759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return l + -r; 87859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 87959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator*(const complex &l, const complex &r) { 88059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex(l.re * r.re - l.im * r.im, l.re * r.im + l.im * r.re); 88159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 88259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr bool operator==(const complex &l, const complex &r) { 88359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return l.re == r.re && l.im == r.im; 88459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 88559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr bool operator!=(const complex &r) const { 88659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return re != r.re || im != r.im; 88759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 88859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int real() const { return re; } 88959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int imag() const { return im; } 89059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 89159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 89259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex i = complex(0, 1); 89359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex k = (3 + 4*i) * (6 - 4*i); 8949eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1,0).real() == 1, ""); 8959eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1,0).imag() == 0, ""); 8969eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(((complex)1).imag() == 0, ""); 8979eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(k.real() == 34, ""); 8989eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(k.imag() == 12, ""); 8999eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(k - 34 == 12*i, ""); 9009eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((complex)1 == complex(1), ""); 9019eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((complex)1 != complex(0, 1), ""); 9029eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1) == complex(1), ""); 9039eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1) != complex(0, 1), ""); 90459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex makeComplex(int re, int im) { return complex(re, im); } 9059eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(makeComplex(1,0) == complex(1), ""); 9069eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(makeComplex(1,0) != complex(0, 1), ""); 90759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 90859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithclass complex_wrap : public complex { 90959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithpublic: 91059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex_wrap(int re, int im = 0) : complex(re, im) {} 91159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex_wrap(const complex_wrap &o) : complex(o) {} 91259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 91359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 9149eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((complex_wrap)1 == complex(1), ""); 9159eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((complex)1 != complex_wrap(0, 1), ""); 9169eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1) == complex_wrap(1), ""); 9179eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex_wrap(1) != complex(0, 1), ""); 91859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex_wrap makeComplexWrap(int re, int im) { 91959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex_wrap(re, im); 92059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 9219eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(makeComplexWrap(1,0) == complex(1), ""); 9229eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(makeComplexWrap(1,0) != complex(0, 1), ""); 92359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 92459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 925f59ff8c777379bd54137853a58c58b72fb869152Eli Friedman 926f59ff8c777379bd54137853a58c58b72fb869152Eli Friedmannamespace PR11595 { 927f59ff8c777379bd54137853a58c58b72fb869152Eli Friedman struct A { constexpr bool operator==(int x) { return true; } }; 928af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith struct B { B(); A& x; }; 929af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith static_assert(B().x == 3, ""); // expected-error {{constant expression}} expected-note {{non-literal type 'PR11595::B' cannot be used in a constant expression}} 930af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith 931af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith constexpr bool f(int k) { 932af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith return B().x == k; // expected-note {{non-literal type 'PR11595::B' cannot be used in a constant expression}} 933af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith } 934af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith constexpr int n = f(1); // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'f(1)'}} 935f59ff8c777379bd54137853a58c58b72fb869152Eli Friedman} 936bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith 937bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smithnamespace ExprWithCleanups { 938bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith struct A { A(); ~A(); int get(); }; 939bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith constexpr int get(bool FromA) { return FromA ? A().get() : 1; } 940bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith constexpr int n = get(false); 941bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith} 9427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 9437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithnamespace Volatile { 9447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 9457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithvolatile constexpr int n1 = 0; // expected-note {{here}} 9467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithvolatile const int n2 = 0; // expected-note {{here}} 9477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithint n3 = 37; // expected-note {{declared here}} 9487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 9497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithconstexpr int m1 = n1; // expected-error {{constant expression}} expected-note {{read of volatile object 'n1'}} 9507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithconstexpr int m2 = n2; // expected-error {{constant expression}} expected-note {{read of volatile object 'n2'}} 9517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 9527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstruct T { int n; }; 9537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithconst T t = { 42 }; // expected-note {{declared here}} 9547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 9557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithconstexpr int f(volatile int &&r) { 9567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return r; // expected-note {{read of volatile temporary is not allowed in a constant expression}} 9577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith} 9587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smithstruct S { 9597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith int k : f(0); // expected-error {{constant expression}} expected-note {{temporary created here}} expected-note {{in call to 'f(0)'}} 9607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith int l : n3; // expected-error {{constant expression}} expected-note {{read of non-const variable}} 9617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith int m : t.n; // expected-error {{constant expression}} expected-note {{read of non-constexpr variable}} 9627098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith}; 9637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 9647098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith} 965