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// RUN: %clang_cc1 -std=c++20 -x c++ %s -verify
// RUN: %clang_cc1 -std=c++23 -x c++ %s -verify
// Test parsing of the optional requires-clause in a template-declaration.
template <typename T> requires true
void foo() { }
template <typename T> requires (!0)
struct A {
void foo();
struct AA;
enum E : int;
static int x;
static constexpr int z = 16;
template <typename> requires true
void Mfoo();
template <typename> requires true
struct M;
template <typename> requires true
static int Mx;
template <typename TT> requires true
using MQ = M<TT>;
constexpr int bazz() requires (z == 16);
};
template <typename T> requires (!0)
void A<T>::foo() { }
template <typename T> requires (!0)
struct A<T>::AA { };
template <typename T> requires (!0)
enum A<T>::E : int { E0 };
template <typename T> requires (!0)
int A<T>::x = 0;
template <typename T> requires (!0)
template <typename> requires true
void A<T>::Mfoo() { }
template <typename T> requires (!0)
template <typename> requires true
struct A<T>::M { };
template <typename T> requires (!0)
template <typename> requires true
int A<T>::Mx = 0;
template <typename T> requires true
int x = 0;
template <typename T> requires true
using Q = A<T>;
template<typename T> requires (!0)
constexpr int A<T>::bazz() requires (z == 16) { return z; }
struct C {
template <typename> requires true
void Mfoo();
template <typename> requires true
struct M;
template <typename> requires true
static int Mx;
template <typename T> requires true
using MQ = M<T>;
};
template <typename> requires true
void C::Mfoo() { }
template <typename> requires true
struct C::M { };
template <typename> requires true
int C::Mx = 0;
// Test behavior with non-primary-expression requires clauses
template<typename T> requires foo<T>()
// expected-error@-1{{parentheses are required around this expression in a requires clause}}
struct B1 { };
int func() { }
template<typename T> requires func()
// expected-error@-1{{atomic constraint must be of type 'bool' (found '<overloaded function type>')}}
// expected-note@-2{{parentheses are required around this expression in a requires clause}}
struct B2 { };
template<typename T> requires (foo<T>())
struct B3 { };
template<typename T> requires T{}
// expected-error@-1{{parentheses are required around this expression in a requires clause}}
struct B4 { };
template<typename T> requires sizeof(T) == 0
// expected-error@-1{{parentheses are required around this expression in a requires clause}}
struct B5 { };
template<typename T> requires (sizeof(T)) == 0
// expected-error@-1{{parentheses are required around this expression in a requires clause}}
struct B6 { };
template<typename T> requires 0
// expected-error@-1{{atomic constraint must be of type 'bool' (found 'int')}}
(int) bar() { };
template<typename T> requires foo<T>
(int) bar() { };
// expected-error@-1{{expected '(' for function-style cast or type construction}}
template<typename T>
void bar() requires foo<T>();
// expected-error@-1{{parentheses are required around this expression in a requires clause}}
template<typename T>
void bar() requires (foo<T>());
template<typename T>
void bar() requires func();
// expected-error@-1{{atomic constraint must be of type 'bool' (found '<overloaded function type>')}}
// expected-note@-2{{parentheses are required around this expression in a requires clause}}
template<typename T>
void bar() requires T{};
// expected-error@-1{{parentheses are required around this expression in a requires clause}}
template<typename T>
void bar() requires sizeof(T) == 0;
// expected-error@-1{{parentheses are required around this expression in a requires clause}}
template<typename T>
void bar() requires (sizeof(T)) == 0;
// expected-error@-1{{parentheses are required around this expression in a requires clause}}
template<typename T>
void bar(int x, int y) requires (x, y, true);
template<typename T>
struct B {
int x;
void foo(int y) requires (x, this, this->x, y, true);
static void bar(int y) requires (x, true);
// expected-error@-1{{'this' cannot be implicitly used in a static member function declaration}}
static void baz(int y) requires (this, true);
// expected-error@-1{{'this' cannot be used in a static member function declaration}}
};
auto lambda1 = [] (auto x) requires (sizeof(decltype(x)) == 1) { };
auto lambda2 = [] (auto x) constexpr -> int requires (sizeof(decltype(x)) == 1) { return 0; };
auto lambda3 = []<auto> requires(sizeof(char) == 1){};
auto lambda4 = [] requires(sizeof(char) == 1){}; // expected-error {{expected body of lambda expression}}
#if __cplusplus <= 202002L
// expected-warning@-2{{lambda without a parameter clause is a C++23 extension}}
#endif
namespace GH78524 {
template <typename T> T Foo;
template <typename T> auto C(Foo<T>);
template <typename T> struct D {
decltype(T()(C<T>)) Type;
};
template <typename T, typename U> D<T> G(T, U) { return {}; }
struct E {};
void F() {
G([]<typename T>
// ~~~~~~~~~~ T: Depth: 0, Index: 0
requires requires { [](auto...) {}; }(T)
// ~~~~ auto: Depth: 1, Index: 0
{ return T(); },
E{});
}
int a = []<int=0> requires requires { [](auto){}; } { return 0; }();
} // namespace GH78524
namespace GH51868 {
template<auto L>
concept C = requires {
typename decltype(L)::template operator()<int>;
// expected-error@-1 {{template name refers to non-type template 'decltype(L)::template operator ()'}}
};
}
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