derek.holloway
7502bf64a4
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69 lines
2.9 KiB
C++
69 lines
2.9 KiB
C++
// RUN: %clang_cc1 -std=c++2a -verify %s
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template<typename T, typename U>
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constexpr bool is_same_v = false;
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template<typename T>
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constexpr bool is_same_v<T, T> = true;
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using T = void ();
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void f1non_templ(int a) requires true; // expected-error{{non-templated function cannot have a requires clause}}
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auto f2non_templ(int a) -> bool requires true; // expected-error{{non-templated function cannot have a requires clause}}
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auto f3non_templ(int a) -> bool (*)(int b) requires true; // expected-error{{non-templated function cannot have a requires clause}}
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// expected-error@+1{{non-templated function cannot have a requires clause}}
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auto f4_non_templ(int a) requires true -> bool; // expected-error{{trailing return type must appear before trailing requires clause}}
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void (f7non_templ()) requires true; // expected-error{{non-templated function cannot have a requires clause}}
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// expected-error@+1{{non-templated function cannot have a requires clause}}
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void (f8non_templ() requires true); // expected-error{{trailing requires clause should be placed outside parentheses}}
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// expected-error@+1{{non-templated function cannot have a requires clause}}
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T xnon_templ requires true;
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// expected-error@+2 2{{non-templated function cannot have a requires clause}}
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struct Snon_templ {
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T m1 requires true, m2 requires true;
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};
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template <typename>
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void f1(int a)
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requires true; // OK
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template <typename>
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auto f2(int a) -> bool
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requires true; // OK
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template <typename>
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auto f3(int a) -> bool (*)(int b) requires true; // OK
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template <typename>
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auto f4(int a) requires true -> bool; // expected-error{{trailing return type must appear before trailing requires clause}}
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int f5(int a) requires; // expected-error{{expected expression}}
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int f6(int a) requires {} // expected-error{{expected expression}}
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template<typename>
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void (f7()) requires true;
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template<typename>
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void (f8() requires true); // expected-error{{trailing requires clause should be placed outside parentheses}}
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void (*(f9 requires (true)))(); // expected-error{{trailing requires clause should be placed outside parentheses}}
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static_assert(is_same_v<decltype(f9), void (*)()>);
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void (*pf)() requires true; // expected-error{{trailing requires clause can only be used when declaring a function}}
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void g1(int (*dsdads)() requires false); // expected-error{{trailing requires clause can only be used when declaring a function}}
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void g2(int (*(*dsdads)())() requires true); // expected-error{{trailing requires clause can only be used when declaring a function}}
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void g3(int (*(*dsdads)(int) requires true)() ); // expected-error{{trailing requires clause should be placed outside parentheses}}
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template<typename U>
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struct Foo{
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T x requires true;
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};
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Foo<int> f;
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template<typename>
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struct S {
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T m1 requires true, m2 requires true;
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};
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template<typename T>
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struct R {
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R(T t);
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};
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template<typename T>
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R(T) -> R<T> requires true;
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