constant-expression-cxx11.cpp revision 1bf9a9e6a5bdc0de7939908855dcddf46b661800
159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 %s 259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// This version of static_assert just requires a foldable value as the 459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// expression, not an ICE. 559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: Once we implement the C++11 ICE rules, most uses of this here should 659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// be converted to static_assert. 759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith#define static_assert_fold(expr, str) \ 859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert(__builtin_constant_p(expr), "not an integral constant expression"); \ 959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert(__builtin_constant_p(expr) ? expr : true, str) 1059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StaticAssertFoldTest { 1259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint x; 1459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(++x, "test"); // expected-error {{not an integral constant expression}} 1559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(false, "test"); // expected-error {{test}} 1659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 1859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: support const T& parameters here. 2059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//template<typename T> constexpr T id(const T &t) { return t; } 2159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithtemplate<typename T> constexpr T id(T t) { return t; } 2259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: support templates here. 2359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//template<typename T> constexpr T min(const T &a, const T &b) { 2459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// return a < b ? a : b; 2559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//} 2659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//template<typename T> constexpr T max(const T &a, const T &b) { 2759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// return a < b ? b : a; 2859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//} 2959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int min(const int &a, const int &b) { return a < b ? a : b; } 3059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int max(const int &a, const int &b) { return a < b ? b : a; } 3159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct MemberZero { 3359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int zero() { return 0; } 3459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 3559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DerivedToVBaseCast { 3759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct U { int n; }; 3959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct V : U { int n; }; 4059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct A : virtual V { int n; }; 4159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Aa { int n; }; 4259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct B : virtual A, Aa {}; 4359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct C : virtual A, Aa {}; 4459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct D : B, C {}; 4559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 4659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith D d; 4759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B *p = &d; 4859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C *q = &d; 4959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((void*)p != (void*)q, ""); 5059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((A*)p == (A*)q, ""); 5159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((Aa*)p != (Aa*)q, ""); 5259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B &pp = d; 5459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C &qq = d; 5559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((void*)&pp != (void*)&qq, ""); 5659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(&(A&)pp == &(A&)qq, ""); 5759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(&(Aa&)pp != &(Aa&)qq, ""); 5859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *v = p; 6059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *w = q; 6159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *x = (A*)p; 6259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(v == w, ""); 6359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(v == x, ""); 6459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 6559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((U*)&d == p, ""); 6659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((U*)&d == q, ""); 6759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((U*)&d == v, ""); 6859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((U*)&d == w, ""); 6959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((U*)&d == x, ""); 7059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 7159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct X {}; 7259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Y1 : virtual X {}; 7359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Y2 : X {}; 7459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Z : Y1, Y2 {}; 7559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Z z; 7659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold((X*)(Y1*)&z != (X*)(Y2*)&z, ""); 7759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 7859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 7959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 80f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithnamespace ConstCast { 81f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 82f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n1 = 0; 83f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n2 = const_cast<int&>(n1); 84f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int *n3 = const_cast<int*>(&n1); 85f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n4 = *const_cast<int*>(&n1); 86f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr const int * const *n5 = const_cast<const int* const*>(&n3); 87f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int **n6 = const_cast<int**>(&n3); 88f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n7 = **n5; 89f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n8 = **n6; 90f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 91f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith} 92f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 9359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace TemplateArgumentConversion { 9459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith template<int n> struct IntParam {}; 9559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 9659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith using IntParam0 = IntParam<0>; 9759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: This should be accepted once we do constexpr function invocation. 9859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith using IntParam0 = IntParam<id(0)>; // expected-error {{not an integral constant expression}} 9959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith using IntParam0 = IntParam<MemberZero().zero>; // expected-error {{did you mean to call it with no arguments?}} expected-error {{not an integral constant expression}} 10059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 10159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 10259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace CaseStatements { 10359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void f(int n) { 10459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (n) { 10559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: Produce the 'add ()' fixit for this. 10659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case MemberZero().zero: // desired-error {{did you mean to call it with no arguments?}} expected-error {{not an integer constant expression}} 10759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: This should be accepted once we do constexpr function invocation. 10859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case id(1): // expected-error {{not an integer constant expression}} 10959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return; 11059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 11159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 11259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 11359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 11459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern int &Recurse1; 11559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint &Recurse2 = Recurse1, &Recurse1 = Recurse2; 11659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int &Recurse3 = Recurse2; // expected-error {{must be initialized by a constant expression}} 11759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 11859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace MemberEnum { 11959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct WithMemberEnum { 12059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith enum E { A = 42 }; 12159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } wme; 12259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 12359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(wme.A == 42, ""); 12459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 12559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 12659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DefaultArguments { 12759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 12859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconst int z = int(); 12959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int Sum(int a = 0, const int &b = 0, const int *c = &z, char d = 0) { 13059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a + b + *c + d; 13159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 13259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconst int four = 4; 13359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int eight = 8; 13459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int twentyseven = 27; 13559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(Sum() == 0, ""); 13659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(Sum(1) == 1, ""); 13759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(Sum(1, four) == 5, ""); 13859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(Sum(1, eight, &twentyseven) == 36, ""); 13959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(Sum(1, 2, &four, eight) == 15, ""); 14059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 14159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 14259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 14359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Ellipsis { 14459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 14559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// Note, values passed through an ellipsis can't actually be used. 14659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int F(int a, ...) { return a; } 14759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(F(0) == 0, ""); 14859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(F(1, 0) == 1, ""); 14959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(F(2, "test") == 2, ""); 15059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(F(3, &F) == 3, ""); 15159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint k = 0; 15259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(F(4, k) == 3, ""); // expected-error {{constant expression}} 15359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 15459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 15559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 15659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Recursion { 15759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int fib(int n) { return n > 1 ? fib(n-1) + fib(n-2) : n; } 15859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(fib(11) == 89, ""); 15959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 16059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int gcd_inner(int a, int b) { 16159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return b == 0 ? a : gcd_inner(b, a % b); 16259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 16359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int gcd(int a, int b) { 16459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return gcd_inner(max(a, b), min(a, b)); 16559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 16659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 16759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(gcd(1749237, 5628959) == 7, ""); 16859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 16959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 17059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace FunctionCast { 17159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // When folding, we allow functions to be cast to different types. Such 17259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // cast functions cannot be called, even if they're constexpr. 17359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int f() { return 1; } 17459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith typedef double (*DoubleFn)(); 17559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith typedef int (*IntFn)(); 17659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a[(int)DoubleFn(f)()]; // expected-error {{variable length array}} 17759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int b[(int)IntFn(f)()]; // ok 17859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 17959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 18059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StaticMemberFunction { 18159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct S { 18259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static constexpr int k = 42; 18359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static constexpr int f(int n) { return n * k + 2; } 18459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } s; 18559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 18659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int n = s.f(19); 18759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(S::f(19) == 800, ""); 18859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(s.f(19) == 800, ""); 18959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(n == 800, ""); 1901bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 1911bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr int (*sf1)(int) = &S::f; 1921bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr int (*sf2)(int) = &s.f; 1931bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr const int *sk = &s.k; 19459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 19559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 19659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace ParameterScopes { 19759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 19859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int k = 42; 19959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr const int &ObscureTheTruth(const int &a) { return a; } 20059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr const int &MaybeReturnJunk(bool b, const int a) { 20159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ObscureTheTruth(b ? a : k); 20259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 20359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(MaybeReturnJunk(false, 0) == 42, ""); // ok 20459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int a = MaybeReturnJunk(true, 0); // expected-error {{constant expression}} 20559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 20659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr const int MaybeReturnNonstaticRef(bool b, const int a) { 20759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // If ObscureTheTruth returns a reference to 'a', the result is not a 20859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // constant expression even though 'a' is still in scope. 20959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ObscureTheTruth(b ? a : k); 21059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 21159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(MaybeReturnNonstaticRef(false, 0) == 42, ""); // ok 21259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int b = MaybeReturnNonstaticRef(true, 0); // expected-error {{constant expression}} 21359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 21459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int InternalReturnJunk(int n) { 21559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: We should reject this: it never produces a constant expression. 21659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return MaybeReturnJunk(true, n); 21759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 21859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int n3 = InternalReturnJunk(0); // expected-error {{must be initialized by a constant expression}} 21959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int LToR(int &n) { return n; } 22159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int GrabCallersArgument(bool which, int a, int b) { 22259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return LToR(which ? b : a); 22359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 22459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(GrabCallersArgument(false, 1, 2) == 1, ""); 22559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(GrabCallersArgument(true, 4, 8) == 8, ""); 22659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 22859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Pointers { 23059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int f(int n, const int *a, const int *b, const int *c) { 23259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return n == 0 ? 0 : *a + f(n-1, b, c, a); 23359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 23459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int x = 1, y = 10, z = 100; 23659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(f(23, &x, &y, &z) == 788, ""); 23759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int g(int n, int a, int b, int c) { 23959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return f(n, &a, &b, &c); 24059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 24159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(g(23, x, y, z) == 788, ""); 24259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 24359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 24459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 24559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace FunctionPointers { 24659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 24759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Double(int n) { return 2 * n; } 24859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Triple(int n) { return 3 * n; } 24959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Twice(int (*F)(int), int n) { return F(F(n)); } 25059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Quadruple(int n) { return Twice(Double, n); } 25159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr auto Select(int n) -> int (*)(int) { 25259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0; 25359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 25459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Apply(int (*F)(int), int n) { return F(n); } 25559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static_assert_fold(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, ""); 25759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Invalid = Apply(Select(0), 0); // expected-error {{must be initialized by a constant expression}} 25959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 26059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 26159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 26259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace PointerComparison { 26359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 26459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint x, y; 26559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x == &y, "false"); // expected-error {{false}} 26659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x != &y, ""); 26759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g1 = &x == &y; 26859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g2 = &x != &y; 26959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g3 = &x <= &y; // expected-error {{must be initialized by a constant expression}} 27059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g4 = &x >= &y; // expected-error {{must be initialized by a constant expression}} 27159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g5 = &x < &y; // expected-error {{must be initialized by a constant expression}} 27259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g6 = &x > &y; // expected-error {{must be initialized by a constant expression}} 27359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 27459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct S { int x, y; } s; 27559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&s.x == &s.y, "false"); // expected-error {{false}} 27659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&s.x != &s.y, ""); 27759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&s.x <= &s.y, ""); 27859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&s.x >= &s.y, "false"); // expected-error {{false}} 27959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&s.x < &s.y, ""); 28059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&s.x > &s.y, "false"); // expected-error {{false}} 28159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 28259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(0 == &y, "false"); // expected-error {{false}} 28359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(0 != &y, ""); 28459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n3 = 0 <= &y; // expected-error {{must be initialized by a constant expression}} 28559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n4 = 0 >= &y; // expected-error {{must be initialized by a constant expression}} 28659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n5 = 0 < &y; // expected-error {{must be initialized by a constant expression}} 28759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n6 = 0 > &y; // expected-error {{must be initialized by a constant expression}} 28859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 28959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x == 0, "false"); // expected-error {{false}} 29059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x != 0, ""); 29159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n9 = &x <= 0; // expected-error {{must be initialized by a constant expression}} 29259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n10 = &x >= 0; // expected-error {{must be initialized by a constant expression}} 29359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n11 = &x < 0; // expected-error {{must be initialized by a constant expression}} 29459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n12 = &x > 0; // expected-error {{must be initialized by a constant expression}} 29559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 29659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x == &x, ""); 29759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x != &x, "false"); // expected-error {{false}} 29859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x <= &x, ""); 29959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x >= &x, ""); 30059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x < &x, "false"); // expected-error {{false}} 30159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&x > &x, "false"); // expected-error {{false}} 30259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 30359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr S* sptr = &s; 30459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: This is not a constant expression; check we reject this and move this 30559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// test elsewhere. 30659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool dyncast = sptr == dynamic_cast<S*>(sptr); 30759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 30859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern char externalvar[]; 30959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: This is not a constant expression; check we reject this and move this 31059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// test elsewhere. 31159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool constaddress = (void *)externalvar == (void *)0x4000UL; // expected-error {{must be initialized by a constant expression}} 31259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}} expected-warning {{unspecified}} 31359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(0 != "foo", ""); 31459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 31559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 31659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 31759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace MaterializeTemporary { 31859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 31959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int f(const int &r) { return r; } 32059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int n = f(1); 32159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 32259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool same(const int &a, const int &b) { return &a == &b; } 32359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool sameTemporary(const int &n) { return same(n, n); } 32459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 32559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(n, ""); 32659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(!same(4, 4), ""); 32759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(same(n, n), ""); 32859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(sameTemporary(9), ""); 32959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 33159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int strcmp_ce(const char *p, const char *q) { 33359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1); 33459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 33559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StringLiteral { 33759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: Refactor this once we support constexpr templates. 33959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MangleChars(const char *p) { 34059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + 3 * (*p ? MangleChars(p+1) : 0); 34159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 34259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MangleChars(const char16_t *p) { 34359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + 3 * (*p ? MangleChars(p+1) : 0); 34459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 34559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MangleChars(const char32_t *p) { 34659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + 3 * (*p ? MangleChars(p+1) : 0); 34759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 34859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 34959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(MangleChars("constexpr!") == 1768383, ""); 35059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(MangleChars(u"constexpr!") == 1768383, ""); 35159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(MangleChars(U"constexpr!") == 1768383, ""); 35259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 35359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c0 = "nought index"[0]; 35459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c1 = "nice index"[10]; 35559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c2 = "nasty index"[12]; // expected-error {{must be initialized by a constant expression}} expected-warning {{indexes past the end}} 35659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c3 = "negative index"[-1]; // expected-error {{must be initialized by a constant expression}} expected-warning {{indexes before the beginning}} 35759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c4 = ((char*)(int*)"no reinterpret_casts allowed")[14]; // expected-error {{must be initialized by a constant expression}} 35859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 35959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *p = "test" + 2; 36059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(*p == 's', ""); 36159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 36259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max_iter(const char *a, const char *b) { 36359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *a < *b ? b : a; 36459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 36559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max_element(const char *a, const char *b) { 36659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return (a+1 >= b) ? a : max_iter(a, max_element(a+1, b)); 36759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 36859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 36959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *begin(const char (&arr)[45]) { return arr; } 37059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *end(const char (&arr)[45]) { return arr + 45; } 37159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 37259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char str[] = "the quick brown fox jumped over the lazy dog"; 37359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max = max_element(begin(str), end(str)); 37459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(*max == 'z', ""); 37559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(max == str + 38, ""); 37659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 37759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(strcmp_ce("hello world", "hello world") == 0, ""); 37859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(strcmp_ce("hello world", "hello clang") > 0, ""); 37959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(strcmp_ce("constexpr", "test") < 0, ""); 38059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(strcmp_ce("", " ") < 0, ""); 38159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 38259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 38359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 38459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Array { 38559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 38659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: Use templates for these once we support constexpr templates. 38759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int Sum(const int *begin, const int *end) { 38859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return begin == end ? 0 : *begin + Sum(begin+1, end); 38959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 39059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int *begin(const int (&xs)[5]) { return xs; } 39159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int *end(const int (&xs)[5]) { return xs + 5; } 39259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 39359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs[] = { 1, 2, 3, 4, 5 }; 39459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int ys[] = { 5, 4, 3, 2, 1 }; 39559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int sum_xs = Sum(begin(xs), end(xs)); 39659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(sum_xs == 15, ""); 39759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 39859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int ZipFoldR(int (*F)(int x, int y, int c), int n, 39959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int *xs, const int *ys, int c) { 40059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return n ? F(*xs, *ys, ZipFoldR(F, n-1, xs+1, ys+1, c)) : c; 40159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 40259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MulAdd(int x, int y, int c) { return x * y + c; } 40359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int InnerProduct = ZipFoldR(MulAdd, 5, xs, ys, 0); 40459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(InnerProduct == 35, ""); 40559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 40659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int SubMul(int x, int y, int c) { return (x - y) * c; } 40759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int DiffProd = ZipFoldR(SubMul, 2, xs+3, ys+3, 1); 40859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(DiffProd == 8, ""); 40959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(ZipFoldR(SubMul, 3, xs+3, ys+3, 1), ""); // expected-error {{constant expression}} 41059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 41159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int *p = xs + 3; 41259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs4 = p[1]; // ok 41359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs5 = p[2]; // expected-error {{constant expression}} 41459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs0 = p[-3]; // ok 41559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs_1 = p[-4]; // expected-error {{constant expression}} 41659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 41759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int zs[2][2][2][2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 41859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(zs[0][0][0][0] == 1, ""); 41959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(zs[1][1][1][1] == 16, ""); 42059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}} 42159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold((&zs[0][0][0][2])[-1] == 2, ""); 42259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(**(**(zs + 1) + 1) == 11, ""); 42359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, ""); 42459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 42559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int arr[40] = { 1, 2, 3, [8] = 4 }; 42659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int SumNonzero(const int *p) { 42759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + (*p ? SumNonzero(p+1) : 0); 42859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 42959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int CountZero(const int *p, const int *q) { 43059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return p == q ? 0 : (*p == 0) + CountZero(p+1, q); 43159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 43259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(SumNonzero(arr) == 6, ""); 43359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(CountZero(arr, arr + 40) == 36, ""); 43459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 43559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 43659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 43759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DependentValues { 43859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 43959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct I { int n; typedef I V[10]; }; 44059efe266b804330f4c1f3a1b0ff783e67dd90378Richard SmithI::V x, y; 44159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithtemplate<bool B> struct S { 44259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int k; 44359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void f() { 44459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith I::V &cells = B ? x : y; 44559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith I &i = cells[k]; 44659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (i.n) {} 44759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 44859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 44959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 45059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 45159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 45259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Class { 45359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 45459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct A { constexpr A(int a, int b) : k(a + b) {} int k; }; 45559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int fn(const A &a) { return a.k; } 45659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(fn(A(4,5)) == 9, ""); 45759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 45859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}} 45959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct C { 46059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C(C *this_) : m(42), n(this_->m) {} // ok 46159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int m, n; 46259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 46359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct D { 46459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith C c; 46559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr D() : c(&c) {} 46659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 46759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(D().c.n == 42, ""); 46859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 46959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct E { 47059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr E() : p(&p) {} 47159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void *p; 47259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 47359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const E &e1 = E(); // expected-error {{constant expression}} 47459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// This is a constant expression if we elide the copy constructor call, and 47559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// is not a constant expression if we don't! But we do, so it is. 47659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: The move constructor is not currently implicitly defined as constexpr. 47759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// We notice this when evaluating an expression which uses it, but not when 47859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// checking its initializer. 47959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr E e2 = E(); // unexpected-error {{constant expression}} 48059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(e2.p == &e2.p, ""); // unexpected-error {{constant expression}} 48159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: We don't pass through the fact that 'this' is ::e3 when checking the 48259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// initializer of this declaration. 48359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr E e3; // unexpected-error {{constant expression}} 48459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(e3.p == &e3.p, ""); 48559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 48659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern const class F f; 48759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct F { 48859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr F() : p(&f.p) {} 48959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const void *p; 49059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 49159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr F f = F(); 49259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 49359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct G { 49459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct T { 49559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr T(T *p) : u1(), u2(p) {} 49659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith union U1 { 49759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr U1() {} 49859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a, b = 42; 49959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } u1; 50059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith union U2 { 50159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr U2(T *p) : c(p->u1.b) {} 50259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int c, d; 50359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } u2; 50459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } t; 50559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr G() : t(&t) {} 50659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} constexpr g; 50759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 50859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(g.t.u1.a == 42, ""); // expected-error {{constant expression}} 50959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(g.t.u1.b == 42, ""); 51059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(g.t.u2.c == 42, ""); 51159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(g.t.u2.d == 42, ""); // expected-error {{constant expression}} 51259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 51359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct S { 51459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a, b; 51559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const S *p; 51659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith double d; 51759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char *q; 51859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 51959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {} 52059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 52159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 52259efe266b804330f4c1f3a1b0ff783e67dd90378Richard SmithS global(43, &global); 52359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 52459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(S(15, &global).b == 15, ""); 52559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 52659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool CheckS(const S &s) { 52759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l'; 52859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 52959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(CheckS(S(27, &global)), ""); 53059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 53159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct Arr { 53259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith char arr[3]; 53359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Arr() : arr{'x', 'y', 'z'} {} 53459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 53559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int hash(Arr &&a) { 53659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000; 53759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 53859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int k = hash(Arr()); 53959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(k == 0x007a7978, ""); 54059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 54159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 54259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct AggregateInit { 54359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char &c; 54459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int n; 54559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith double d; 54659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int arr[5]; 54759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void *p; 54859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 54959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 55059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr AggregateInit agg1 = { "hello"[0] }; 55159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 55259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(strcmp_ce(&agg1.c, "hello") == 0, ""); 55359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(agg1.n == 0, ""); 55459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(agg1.d == 0.0, ""); 55559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}} 55659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(agg1.arr[0] == 0, ""); 55759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(agg1.arr[4] == 0, ""); 55859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(agg1.arr[5] == 0, ""); // expected-error {{constant expression}} 55959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(agg1.p == nullptr, ""); 56059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 56159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace SimpleDerivedClass { 56259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 56359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct B { 56459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B(int n) : a(n) {} 56559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 56659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 56759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct D : B { 56859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr D(int n) : B(n) {} 56959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 57059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr D d(3); 57159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(d.a == 3, ""); 57259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 57359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 57459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 57559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct Base { 57659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {} 57759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 57859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char *b; 57959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 58059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct Base2 { 58159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Base2(const int &r) : r(r) {} 58259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int q = 123; 58359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: When we track the global for which we are computing the initializer, 58459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // use a reference here. 58559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith //const int &r; 58659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int r; 58759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 58859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct Derived : Base, Base2 { 58959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Derived() : Base(76), Base2(a) {} 59059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int c = r + b[1]; 59159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 59259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 59359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool operator==(const Base &a, const Base &b) { 59459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a.a == b.a && strcmp_ce(a.b, b.b) == 0; 59559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 59659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 59759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Base base; 59859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Base base2(76); 59959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Derived derived; 60059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(derived.a == 76, ""); 60159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(derived.b[2] == 's', ""); 60259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(derived.c == 76 + 'e', ""); 60359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(derived.q == 123, ""); 60459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(derived.r == 76, ""); 60559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(&derived.r == &derived.a, ""); // expected-error {{}} 60659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 60759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(!(derived == base), ""); 60859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(derived == base2, ""); 60959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 61059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 61159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 61259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Union { 61359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 61459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithunion U { 61559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 61659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int b; 61759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 61859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 61959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } }; 62059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(u[0].a == 0, ""); 62159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(u[0].b, ""); // expected-error {{constant expression}} 62259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(u[1].b == 1, ""); 62359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}} 62459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}} 62559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold((&(u[1]) + 1 + 1)->b == 3, ""); 62659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 62759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 62859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 62959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Complex { 63059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 63159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithclass complex { 63259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int re, im; 63359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithpublic: 63459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex(int re = 0, int im = 0) : re(re), im(im) {} 63559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex(const complex &o) : re(o.re), im(o.im) {} 63659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex operator-() const { return complex(-re, -im); } 63759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator+(const complex &l, const complex &r) { 63859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex(l.re + r.re, l.im + r.im); 63959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 64059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator-(const complex &l, const complex &r) { 64159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return l + -r; 64259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 64359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator*(const complex &l, const complex &r) { 64459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex(l.re * r.re - l.im * r.im, l.re * r.im + l.im * r.re); 64559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 64659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr bool operator==(const complex &l, const complex &r) { 64759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return l.re == r.re && l.im == r.im; 64859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 64959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr bool operator!=(const complex &r) const { 65059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return re != r.re || im != r.im; 65159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 65259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int real() const { return re; } 65359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int imag() const { return im; } 65459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 65559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 65659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex i = complex(0, 1); 65759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex k = (3 + 4*i) * (6 - 4*i); 65859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(complex(1,0).real() == 1, ""); 65959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(complex(1,0).imag() == 0, ""); 66059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(((complex)1).imag() == 0, ""); 66159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(k.real() == 34, ""); 66259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(k.imag() == 12, ""); 66359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(k - 34 == 12*i, ""); 66459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold((complex)1 == complex(1), ""); 66559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold((complex)1 != complex(0, 1), ""); 66659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(complex(1) == complex(1), ""); 66759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(complex(1) != complex(0, 1), ""); 66859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex makeComplex(int re, int im) { return complex(re, im); } 66959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(makeComplex(1,0) == complex(1), ""); 67059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(makeComplex(1,0) != complex(0, 1), ""); 67159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 67259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithclass complex_wrap : public complex { 67359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithpublic: 67459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex_wrap(int re, int im = 0) : complex(re, im) {} 67559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex_wrap(const complex_wrap &o) : complex(o) {} 67659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 67759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 67859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold((complex_wrap)1 == complex(1), ""); 67959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold((complex)1 != complex_wrap(0, 1), ""); 68059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(complex(1) == complex_wrap(1), ""); 68159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(complex_wrap(1) != complex(0, 1), ""); 68259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex_wrap makeComplexWrap(int re, int im) { 68359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex_wrap(re, im); 68459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 68559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(makeComplexWrap(1,0) == complex(1), ""); 68659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic_assert_fold(makeComplexWrap(1,0) != complex(0, 1), ""); 68759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 68859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 689