std::coroutine_traits
From cppreference.com
| Defined in header <coroutine>
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| template< class R, class... Args > struct coroutine_traits; |
(since C++20) | |
Determines the promise type from the return type and parameter types of a coroutine. The standard library implementation provides a publicly accessible member type promise_type same as R::promise_type if the qualified-id is valid and denotes a type. Otherwise, it has no such member.
Program-defined specializations of coroutine_traits must define a publicly accessible nested type promise_type, otherwise the program is ill-formed.
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