Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // save_restore.hpp
Chris@16: //
Chris@16: //  Copyright 2008 Eric Niebler. Distributed under the Boost
Chris@16: //  Software License, Version 1.0. (See accompanying file
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_SAVE_RESTORE_HPP_EAN_10_04_2005
Chris@16: #define BOOST_XPRESSIVE_DETAIL_UTILITY_SAVE_RESTORE_HPP_EAN_10_04_2005
Chris@16: 
Chris@16: // MS compatible compilers support #pragma once
Chris@101: #if defined(_MSC_VER)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/noncopyable.hpp>
Chris@16: 
Chris@16: namespace boost { namespace xpressive { namespace detail
Chris@16: {
Chris@16: 
Chris@16:     template<typename T>
Chris@16:     struct save_restore
Chris@16:       : private noncopyable
Chris@16:     {
Chris@16:         explicit save_restore(T &t)
Chris@16:           : ref(t)
Chris@16:           , val(t)
Chris@16:         {
Chris@16:         }
Chris@16: 
Chris@16:         save_restore(T &t, T const &n)
Chris@16:           : ref(t)
Chris@16:           , val(t)
Chris@16:         {
Chris@16:             this->ref = n;
Chris@16:         }
Chris@16: 
Chris@16:         ~save_restore()
Chris@16:         {
Chris@16:             this->ref = this->val;
Chris@16:         }
Chris@16: 
Chris@16:         void restore()
Chris@16:         {
Chris@16:             this->ref = this->val;
Chris@16:         }
Chris@16: 
Chris@16:     private:
Chris@16:         T &ref;
Chris@16:         T const val;
Chris@16:     };
Chris@16: 
Chris@16: }}}
Chris@16: 
Chris@16: #endif