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