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// RUN: %clang_cc1 -std=c++20 -fsyntax-only -verify %s
// expected-error@+2 {{non-templated function cannot have a requires clause}}
void f1(int a)
requires true;
template <typename T>
auto f2(T a) -> bool
requires true; // OK
// expected-error@+4 {{trailing return type must appear before trailing requires clause}}
template <typename T>
auto f3(T a)
requires true
-> bool;
// expected-error@+2{{trailing requires clause can only be used when declaring a function}}
void (*pf)()
requires true;
// expected-error@+1{{trailing requires clause can only be used when declaring a function}}
void g(int (*)() requires true);
// expected-error@+1{{expected expression}}
auto *p = new void(*)(char)
requires true;
namespace GH61748 {
template<typename T>
struct S {
// expected-error@+1 {{non-templated function cannot have a requires clause}}
friend void declared_friend() requires(sizeof(T) > 1);
// OK, is a definition.
friend void defined_friend() requires(sizeof(T) > 1){}
// OK, is a member.
void member() requires(sizeof(T) > 1);
};
template<typename T>
void ContainingFunction() {
// expected-error@+1 {{non-templated function cannot have a requires clause}}
void bad() requires(sizeof(T) > 1);
// expected-error@+1 {{function definition is not allowed here}}
void still_bad() requires(sizeof(T) > 1) {}
}
void NonTemplContainingFunction() {
// expected-error@+1 {{non-templated function cannot have a requires clause}}
(void)[]() requires (sizeof(int)>1){};
// OK, a template.
auto X = [](auto) requires (sizeof(int)>1){};
// OK, a template.
auto Y = []<typename T>(T t) requires (sizeof(int)>1){};
X(1);
Y(1);
}
template<typename T>
union U {
void f() requires true;
};
}
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