asio C++ library
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experimental::promise< void(Ts...), Executor >::all (2 of 4 overloads) 
template<
    is_promise_c... Ps>
static auto all(
    Ps... ps);
Copyright © 2003-2021 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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