/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file save_result.hpp
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* \author Andrey Semashev
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* \date 19.01.2013
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*
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* This header contains function object adapter that saves the result of the adopted function to an external variable.
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*/
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#ifndef BOOST_LOG_UTILITY_FUNCTIONAL_SAVE_RESULT_HPP_INCLUDED_
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#define BOOST_LOG_UTILITY_FUNCTIONAL_SAVE_RESULT_HPP_INCLUDED_
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#include <boost/log/detail/config.hpp>
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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//! Function object wrapper for saving the adopted function object result
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template< typename FunT, typename AssigneeT >
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struct save_result_wrapper
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{
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typedef void result_type;
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save_result_wrapper(FunT fun, AssigneeT& assignee) : m_fun(fun), m_assignee(assignee) {}
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template< typename ArgT >
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result_type operator() (ArgT const& arg) const
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{
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m_assignee = m_fun(arg);
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}
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private:
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FunT m_fun;
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AssigneeT& m_assignee;
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};
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template< typename FunT, typename AssigneeT >
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BOOST_FORCEINLINE save_result_wrapper< FunT, AssigneeT > save_result(FunT const& fun, AssigneeT& assignee)
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{
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return save_result_wrapper< FunT, AssigneeT >(fun, assignee);
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}
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // BOOST_LOG_UTILITY_FUNCTIONAL_SAVE_RESULT_HPP_INCLUDED_
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