asio C++ library
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experimental::is_promise_v 

constexpr bool is_promise_v =is_promise<T>::value;
Requirements

Header: asio/experimental/promise.hpp

Convenience header: None

Copyright © 2003-2022 Christopher M. Kohlhoff

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

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