1 // 2 // detached.hpp 3 // ~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com) 6 // 7 // Distributed under the Boost Software License, Version 1.0. (See accompanying 8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 9 // 10 11 #ifndef BOOST_ASIO_DETACHED_HPP 12 #define BOOST_ASIO_DETACHED_HPP 13 14 #if defined(_MSC_VER) && (_MSC_VER >= 1200) 15 # pragma once 16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) 17 18 #include <boost/asio/detail/config.hpp> 19 #include <memory> 20 21 #include <boost/asio/detail/push_options.hpp> 22 23 namespace boost { 24 namespace asio { 25 26 /// Class used to specify that an asynchronous operation is detached. 27 /** 28 29 * The detached_t class is used to indicate that an asynchronous operation is 30 * detached. That is, there is no completion handler waiting for the 31 * operation's result. A detached_t object may be passed as a handler to an 32 * asynchronous operation, typically using the special value 33 * @c boost::asio::detached. For example: 34 35 * @code my_socket.async_send(my_buffer, boost::asio::detached); 36 * @endcode 37 */ 38 class detached_t 39 { 40 public: 41 /// Constructor. detached_t()42 BOOST_ASIO_CONSTEXPR detached_t() 43 { 44 } 45 }; 46 47 /// A special value, similar to std::nothrow. 48 /** 49 * See the documentation for boost::asio::detached_t for a usage example. 50 */ 51 #if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) 52 constexpr detached_t detached; 53 #elif defined(BOOST_ASIO_MSVC) 54 __declspec(selectany) detached_t detached; 55 #endif 56 57 } // namespace asio 58 } // namespace boost 59 60 #include <boost/asio/detail/pop_options.hpp> 61 62 #include <boost/asio/impl/detached.hpp> 63 64 #endif // BOOST_ASIO_DETACHED_HPP 65