116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
//
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// redirect_disposition.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_REDIRECT_DISPOSITION_HPP
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#define ASIO_REDIRECT_DISPOSITION_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include "asio/detail/type_traits.hpp"
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#include "asio/disposition.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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/// A @ref completion_token adapter used to specify that the disposition
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/// produced by an asynchronous operation is captured to a variable.
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/**
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* The redirect_disposition_t class is used to indicate that any disposition
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* produced by an asynchronous operation is captured to a specified variable.
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*/
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template <typename CompletionToken, ASIO_DISPOSITION Disposition>
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class redirect_disposition_t
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{
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public:
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/// Constructor.
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template <typename T>
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redirect_disposition_t(T&& completion_token, Disposition& d)
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: token_(static_cast<T&&>(completion_token)),
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d_(d)
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{
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}
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//private:
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CompletionToken token_;
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Disposition& d_;
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};
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/// A function object type that adapts a @ref completion_token to capture
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/// any disposition produced by an asynchronous operation to a variable.
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/**
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* May also be used directly as a completion token, in which case it adapts the
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* asynchronous operation's default completion token (or asio::deferred
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* if no default is available).
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*/
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template <ASIO_DISPOSITION Disposition>
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class partial_redirect_disposition
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{
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public:
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/// Constructor that specifies the variable used to capture disposition
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/// values.
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explicit partial_redirect_disposition(Disposition& d)
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: d_(d)
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{
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}
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/// Adapt a @ref completion_token to specify that the completion handler
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/// should capture disposition values to a variable.
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template <typename CompletionToken>
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ASIO_NODISCARD inline
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constexpr redirect_disposition_t<decay_t<CompletionToken>, Disposition>
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operator()(CompletionToken&& completion_token) const
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{
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return redirect_disposition_t<decay_t<CompletionToken>, Disposition>(
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static_cast<CompletionToken&&>(completion_token), d_);
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}
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//private:
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Disposition& d_;
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};
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/// Create a partial completion token adapter that captures disposition values
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/// to a variable.
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/**
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* @note When redirecting to a variable of type @c std::exception_ptr, other
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* disposition types will be automatically converted to @c std::exception_ptr.
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*/
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template <ASIO_DISPOSITION Disposition>
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ASIO_NODISCARD inline partial_redirect_disposition<Disposition>
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redirect_disposition(Disposition& d)
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{
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return partial_redirect_disposition<Disposition>(d);
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}
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/// Adapt a @ref completion_token to capture disposition values to a variable.
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/**
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* @note When redirecting to a variable of type @c std::exception_ptr, other
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* disposition types will be automatically converted to @c std::exception_ptr.
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*/
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template <typename CompletionToken, ASIO_DISPOSITION Disposition>
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ASIO_NODISCARD inline
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redirect_disposition_t<decay_t<CompletionToken>, Disposition>
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redirect_disposition(CompletionToken&& completion_token, Disposition& d)
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{
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return redirect_disposition_t<decay_t<CompletionToken>, Disposition>(
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static_cast<CompletionToken&&>(completion_token), d);
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}
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#include "asio/impl/redirect_disposition.hpp"
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#endif // ASIO_REDIRECT_DISPOSITION_HPP
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