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0001 //
0002 // detail/null_mutex.hpp
0003 // ~~~~~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010 
0011 #ifndef BOOST_ASIO_DETAIL_NULL_MUTEX_HPP
0012 #define BOOST_ASIO_DETAIL_NULL_MUTEX_HPP
0013 
0014 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0015 # pragma once
0016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0017 
0018 #include <boost/asio/detail/config.hpp>
0019 
0020 #include <boost/asio/detail/noncopyable.hpp>
0021 #include <boost/asio/detail/scoped_lock.hpp>
0022 
0023 #include <boost/asio/detail/push_options.hpp>
0024 
0025 namespace boost {
0026 namespace asio {
0027 namespace detail {
0028 
0029 class null_mutex
0030   : private noncopyable
0031 {
0032 public:
0033   typedef boost::asio::detail::scoped_lock<null_mutex> scoped_lock;
0034 
0035   // Constructor.
0036   null_mutex()
0037   {
0038   }
0039 
0040   // Destructor.
0041   ~null_mutex()
0042   {
0043   }
0044 
0045   // Lock the mutex.
0046   void lock()
0047   {
0048   }
0049 
0050   // Unlock the mutex.
0051   void unlock()
0052   {
0053   }
0054 };
0055 
0056 } // namespace detail
0057 } // namespace asio
0058 } // namespace boost
0059 
0060 #include <boost/asio/detail/pop_options.hpp>
0061 
0062 #endif // BOOST_ASIO_DETAIL_NULL_MUTEX_HPP