1 // RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -std=c++20 -fsyntax-only -Wignored-qualifiers -Wno-error=return-type -verify -fblocks -Wno-unreachable-code -Wno-unused-value 2 #ifndef STD_COROUTINE_H 3 #define STD_COROUTINE_H 4 5 namespace std { 6 7 template<typename T> struct remove_reference { typedef T type; }; 8 template<typename T> struct remove_reference<T &> { typedef T type; }; 9 template<typename T> struct remove_reference<T &&> { typedef T type; }; 10 11 template<typename T> 12 typename remove_reference<T>::type &&move(T &&t) noexcept; 13 14 struct input_iterator_tag {}; 15 struct forward_iterator_tag : public input_iterator_tag {}; 16 17 template <class Ret, typename... T> 18 struct coroutine_traits { using promise_type = typename Ret::promise_type; }; 19 20 template <class Promise = void> 21 struct coroutine_handle { 22 static coroutine_handle from_address(void *) noexcept; 23 static coroutine_handle from_promise(Promise &promise); 24 constexpr void* address() const noexcept; 25 }; 26 template <> 27 struct coroutine_handle<void> { 28 template <class PromiseType> 29 coroutine_handle(coroutine_handle<PromiseType>) noexcept; 30 static coroutine_handle from_address(void *); 31 constexpr void* address() const noexcept; 32 }; 33 34 struct suspend_always { 35 bool await_ready() noexcept { return false; } 36 void await_suspend(coroutine_handle<>) noexcept {} 37 void await_resume() noexcept {} 38 }; 39 40 struct suspend_never { 41 bool await_ready() noexcept { return true; } 42 void await_suspend(coroutine_handle<>) noexcept {} 43 void await_resume() noexcept {} 44 }; 45 46 } // namespace std 47 48 #endif // STD_COROUTINE_H 49