| // RUN: %clang_cc1 -std=c++2a -x c++ -verify %s |
| |
| template<typename T> requires (sizeof(T) >= 2) // expected-note{{because 'sizeof(char) >= 2' (1 >= 2) evaluated to false}} |
| struct A { |
| static constexpr int value = sizeof(T); |
| }; |
| |
| static_assert(A<int>::value == 4); |
| static_assert(A<char>::value == 1); // expected-error{{constraints not satisfied for class template 'A' [with T = char]}} |
| |
| template<typename T, typename U> |
| requires (sizeof(T) != sizeof(U) // expected-note{{because 'sizeof(int) != sizeof(char[4])' (4 != 4) evaluated to false}} |
| && sizeof(T) >= 4) // expected-note{{because 'sizeof(char) >= 4' (1 >= 4) evaluated to false}} |
| constexpr int SizeDiff = sizeof(T) > sizeof(U) ? sizeof(T) - sizeof(U) : sizeof(U) - sizeof(T); |
| |
| static_assert(SizeDiff<int, char> == 3); |
| static_assert(SizeDiff<int, char[4]> == 0); // expected-error{{constraints not satisfied for variable template 'SizeDiff' [with T = int, U = char[4]]}} |
| static_assert(SizeDiff<char, int> == 3); // expected-error{{constraints not satisfied for variable template 'SizeDiff' [with T = char, U = int]}} |
| |
| template<typename... Ts> |
| requires ((sizeof(Ts) == 4) || ...) // expected-note{{because 'sizeof(char) == 4' (1 == 4) evaluated to false}} expected-note{{'sizeof(long long) == 4' (8 == 4) evaluated to false}} expected-note{{'sizeof(int[20]) == 4' (80 == 4) evaluated to false}} |
| constexpr auto SumSizes = (sizeof(Ts) + ...); |
| |
| static_assert(SumSizes<char, long long, int> == 13); |
| static_assert(SumSizes<char, long long, int[20]> == 89); // expected-error{{constraints not satisfied for variable template 'SumSizes' [with Ts = <char, long long, int[20]>]}} |
| |
| template<typename T> |
| concept IsBig = sizeof(T) > 100; // expected-note{{because 'sizeof(int) > 100' (4 > 100) evaluated to false}} |
| |
| template<typename T> |
| requires IsBig<T> // expected-note{{'int' does not satisfy 'IsBig'}} |
| using BigPtr = T*; |
| |
| static_assert(sizeof(BigPtr<int>)); // expected-error{{constraints not satisfied for alias template 'BigPtr' [with T = int]}}}} |
| |
| template<typename T> requires T::value // expected-note{{because substituted constraint expression is ill-formed: type 'int' cannot be used prior to '::' because it has no members}} |
| struct S { static constexpr bool value = true; }; |
| |
| struct S2 { static constexpr bool value = true; }; |
| |
| static_assert(S<int>::value); // expected-error{{constraints not satisfied for class template 'S' [with T = int]}} |
| static_assert(S<S2>::value); |
| |
| template<typename T> |
| struct AA |
| { |
| template<typename U> requires (sizeof(U) == sizeof(T)) // expected-note{{because 'sizeof(int[2]) == sizeof(int)' (8 == 4) evaluated to false}} |
| struct B |
| { |
| static constexpr int a = 0; |
| }; |
| |
| template<typename U> requires (sizeof(U) == sizeof(T)) // expected-note{{because 'sizeof(int[2]) == sizeof(int)' (8 == 4) evaluated to false}} |
| static constexpr int b = 1; |
| |
| template<typename U> requires (sizeof(U) == sizeof(T)) // expected-note{{because 'sizeof(int[2]) == sizeof(int)' (8 == 4) evaluated to false}} |
| static constexpr int getB() { // expected-note{{candidate template ignored: constraints not satisfied [with U = int[2]]}} |
| return 2; |
| } |
| |
| static auto foo() |
| { |
| return B<T[2]>::a; // expected-error{{constraints not satisfied for class template 'B' [with U = int[2]]}} |
| } |
| |
| static auto foo1() |
| { |
| return b<T[2]>; // expected-error{{constraints not satisfied for variable template 'b' [with U = int[2]]}} |
| } |
| |
| static auto foo2() |
| { |
| return AA<T>::getB<T[2]>(); // expected-error{{no matching function for call to 'getB'}} |
| } |
| }; |
| |
| constexpr auto x = AA<int>::foo(); // expected-note{{in instantiation of member function 'AA<int>::foo' requested here}} |
| constexpr auto x1 = AA<int>::foo1(); // expected-note{{in instantiation of member function 'AA<int>::foo1' requested here}} |
| constexpr auto x2 = AA<int>::foo2(); // expected-note{{in instantiation of member function 'AA<int>::foo2' requested here}} |
| |
| template<typename T> |
| struct B { using type = typename T::type; }; // expected-error{{type 'int' cannot be used prior to '::' because it has no members}} |
| |
| template<typename T> requires B<T>::type // expected-note{{in instantiation of template class 'B<int>' requested here}} |
| // expected-note@-1{{while substituting template arguments into constraint expression here}} |
| struct C { }; |
| |
| template<typename T> requires (T{}) // expected-error{{atomic constraint must be of type 'bool' (found 'int')}} |
| struct D { }; |
| |
| static_assert(C<int>{}); // expected-note{{while checking constraint satisfaction for template 'C<int>' required here}} |
| static_assert(D<int>{}); // expected-note{{while checking constraint satisfaction for template 'D<int>' required here}} |