17 Language support library [support]

17.12 Coroutines [support.coroutine]

17.12.2 Header <coroutine> synopsis [coroutine.syn]

#include <compare> // see [compare.syn] namespace std { // [coroutine.traits], coroutine traits template<class R, class... ArgTypes> struct coroutine_traits; // [coroutine.handle], coroutine handle template<class Promise = void> struct coroutine_handle; // [coroutine.handle.compare], comparison operators constexpr bool operator==(coroutine_handle<> x, coroutine_handle<> y) noexcept; constexpr strong_ordering operator<=>(coroutine_handle<> x, coroutine_handle<> y) noexcept; // [coroutine.handle.hash], hash support template<class T> struct hash; template<class P> struct hash<coroutine_handle<P>>; // [coroutine.noop], no-op coroutines struct noop_coroutine_promise; template<> struct coroutine_handle<noop_coroutine_promise>; using noop_coroutine_handle = coroutine_handle<noop_coroutine_promise>; noop_coroutine_handle noop_coroutine() noexcept; // [coroutine.trivial.awaitables], trivial awaitables struct suspend_never; struct suspend_always; }