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ba15d186e5
During the ISO C++ Committee meeting plenary session the C++23 Standard has been voted as technical complete. This updates the reference to c++2b to c++23 and updates the __cplusplus macro. Drive-by fixes c++1z -> c++17 and c++2a -> c++20 when seen. Reviewed By: aaron.ballman Differential Revision: https://reviews.llvm.org/D149553
171 lines
4.6 KiB
C++
171 lines
4.6 KiB
C++
// RUN: %clang_cc1 -std=c++20 -x c++ %s -verify
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// RUN: %clang_cc1 -std=c++23 -x c++ %s -verify
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// Test parsing of the optional requires-clause in a template-declaration.
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template <typename T> requires true
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void foo() { }
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template <typename T> requires (!0)
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struct A {
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void foo();
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struct AA;
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enum E : int;
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static int x;
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static constexpr int z = 16;
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template <typename> requires true
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void Mfoo();
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template <typename> requires true
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struct M;
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template <typename> requires true
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static int Mx;
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template <typename TT> requires true
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using MQ = M<TT>;
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constexpr int bazz() requires (z == 16);
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};
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template <typename T> requires (!0)
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void A<T>::foo() { }
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template <typename T> requires (!0)
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struct A<T>::AA { };
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template <typename T> requires (!0)
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enum A<T>::E : int { E0 };
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template <typename T> requires (!0)
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int A<T>::x = 0;
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template <typename T> requires (!0)
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template <typename> requires true
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void A<T>::Mfoo() { }
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template <typename T> requires (!0)
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template <typename> requires true
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struct A<T>::M { };
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template <typename T> requires (!0)
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template <typename> requires true
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int A<T>::Mx = 0;
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template <typename T> requires true
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int x = 0;
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template <typename T> requires true
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using Q = A<T>;
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template<typename T> requires (!0)
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constexpr int A<T>::bazz() requires (z == 16) { return z; }
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struct C {
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template <typename> requires true
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void Mfoo();
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template <typename> requires true
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struct M;
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template <typename> requires true
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static int Mx;
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template <typename T> requires true
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using MQ = M<T>;
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};
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template <typename> requires true
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void C::Mfoo() { }
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template <typename> requires true
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struct C::M { };
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template <typename> requires true
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int C::Mx = 0;
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// Test behavior with non-primary-expression requires clauses
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template<typename T> requires foo<T>()
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// expected-error@-1{{parentheses are required around this expression in a requires clause}}
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struct B1 { };
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int func() { }
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template<typename T> requires func()
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// expected-error@-1{{atomic constraint must be of type 'bool' (found '<overloaded function type>')}}
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// expected-note@-2{{parentheses are required around this expression in a requires clause}}
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struct B2 { };
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template<typename T> requires (foo<T>())
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struct B3 { };
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template<typename T> requires T{}
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// expected-error@-1{{parentheses are required around this expression in a requires clause}}
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struct B4 { };
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template<typename T> requires sizeof(T) == 0
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// expected-error@-1{{parentheses are required around this expression in a requires clause}}
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struct B5 { };
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template<typename T> requires (sizeof(T)) == 0
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// expected-error@-1{{parentheses are required around this expression in a requires clause}}
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struct B6 { };
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template<typename T> requires 0
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// expected-error@-1{{atomic constraint must be of type 'bool' (found 'int')}}
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(int) bar() { };
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template<typename T> requires foo<T>
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(int) bar() { };
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// expected-error@-1{{expected '(' for function-style cast or type construction}}
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template<typename T>
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void bar() requires foo<T>();
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// expected-error@-1{{parentheses are required around this expression in a requires clause}}
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template<typename T>
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void bar() requires (foo<T>());
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template<typename T>
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void bar() requires func();
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// expected-error@-1{{atomic constraint must be of type 'bool' (found '<overloaded function type>')}}
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// expected-note@-2{{parentheses are required around this expression in a requires clause}}
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template<typename T>
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void bar() requires T{};
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// expected-error@-1{{parentheses are required around this expression in a requires clause}}
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template<typename T>
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void bar() requires sizeof(T) == 0;
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// expected-error@-1{{parentheses are required around this expression in a requires clause}}
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template<typename T>
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void bar() requires (sizeof(T)) == 0;
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// expected-error@-1{{parentheses are required around this expression in a requires clause}}
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template<typename T>
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void bar(int x, int y) requires (x, y, true);
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template<typename T>
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struct B {
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int x;
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void foo(int y) requires (x, this, this->x, y, true);
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static void bar(int y) requires (x, true);
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// expected-error@-1{{'this' cannot be implicitly used in a static member function declaration}}
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static void baz(int y) requires (this, true);
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// expected-error@-1{{'this' cannot be used in a static member function declaration}}
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};
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auto lambda1 = [] (auto x) requires (sizeof(decltype(x)) == 1) { };
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auto lambda2 = [] (auto x) constexpr -> int requires (sizeof(decltype(x)) == 1) { return 0; };
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auto lambda3 = []<auto> requires(sizeof(char) == 1){};
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auto lambda4 = [] requires(sizeof(char) == 1){}; // expected-error {{expected body of lambda expression}}
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#if __cplusplus <= 202002L
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// expected-warning@-2{{lambda without a parameter clause is a C++23 extension}}
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#endif
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