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51 lines
1.5 KiB
51 lines
1.5 KiB
//
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// handler_type.hpp
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// ~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2016 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_HANDLER_TYPE_HPP
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#define ASIO_HANDLER_TYPE_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/detail/push_options.hpp"
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namespace asio {
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/// (Deprecated: Use two-parameter version of async_result.) Default handler
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/// type traits provided for all completion token types.
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/**
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* The handler_type traits class is used for determining the concrete handler
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* type to be used for an asynchronous operation. It allows the handler type to
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* be determined at the point where the specific completion handler signature
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* is known.
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*
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* This template may be specialised for user-defined completion token types.
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*/
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template <typename CompletionToken, typename Signature, typename = void>
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struct handler_type
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{
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/// The handler type for the specific signature.
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typedef typename conditional<
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is_same<CompletionToken, typename decay<CompletionToken>::type>::value,
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decay<CompletionToken>,
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handler_type<typename decay<CompletionToken>::type, Signature>
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>::type::type type;
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};
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_HANDLER_TYPE_HPP
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