smart_ptr/detail/atomic_count_win32.hpp

0001 #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_WIN32_HPP_INCLUDED
0002 #define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_WIN32_HPP_INCLUDED
0003
0004 // MS compatible compilers support #pragma once
0005
0006 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
0007 # pragma once
0008 #endif
0009
0010 //
0011 //  boost/detail/atomic_count_win32.hpp
0012 //
0013 //  Copyright (c) 2001-2005 Peter Dimov
0014 //
0015 // Distributed under the Boost Software License, Version 1.0. (See
0016 // accompanying file LICENSE_1_0.txt or copy at
0017 // http://www.boost.org/LICENSE_1_0.txt)
0018 //
0019
0020 #include <boost/smart_ptr/detail/sp_interlocked.hpp>
0021
0022 #if defined(BOOST_SP_REPORT_IMPLEMENTATION)
0023
0024 #include <boost/config/pragma_message.hpp>
0025 BOOST_PRAGMA_MESSAGE("Using Win32 atomic_count")
0026
0027 #endif
0028
0029 namespace boost
0030 {
0031
0032 namespace detail
0033 {
0034
0035 class atomic_count
0036 {
0037 public:
0038
0039     explicit atomic_count( long v ): value_( v )
0040     {
0041     }
0042
0043     long operator++()
0044     {
0045         return BOOST_SP_INTERLOCKED_INCREMENT( &value_ );
0046     }
0047
0048     long operator--()
0049     {
0050         return BOOST_SP_INTERLOCKED_DECREMENT( &value_ );
0051     }
0052
0053     operator long() const
0054     {
0055         return static_cast<long const volatile &>( value_ );
0056     }
0057
0058 private:
0059
0060     atomic_count( atomic_count const & );
0061     atomic_count & operator=( atomic_count const & );
0062
0063     long value_;
0064 };
0065
0066 } // namespace detail
0067
0068 } // namespace boost
0069
0070 #endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_WIN32_HPP_INCLUDED