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///////////////////////////////////////////////////////////////////////////////
// save_restore.hpp
//
// Copyright 2008 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_SAVE_RESTORE_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_DETAIL_UTILITY_SAVE_RESTORE_HPP_EAN_10_04_2005
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/noncopyable.hpp>
namespace boost { namespace xpressive { namespace detail
{
template<typename T>
struct save_restore
: private noncopyable
{
explicit save_restore(T &t)
: ref(t)
, val(t)
{
}
save_restore(T &t, T const &n)
: ref(t)
, val(t)
{
this->ref = n;
}
~save_restore()
{
this->ref = this->val;
}
void restore()
{
this->ref = this->val;
}
private:
T &ref;
T const val;
};
}}}
#endif
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