/*
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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 fun_ref.hpp
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* \author Andrey Semashev
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* \date 30.03.2008
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*
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* This header contains function object reference adapter. The adapter stores a reference to external
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* function object and forwards all calls to the referred function.
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*/
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#ifndef BOOST_LOG_UTILITY_FUNCTIONAL_FUN_REF_HPP_INCLUDED_
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#define BOOST_LOG_UTILITY_FUNCTIONAL_FUN_REF_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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//! Reference wrapper for function objects
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template< typename FunT >
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struct function_reference_wrapper
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{
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typedef typename FunT::result_type result_type;
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explicit function_reference_wrapper(FunT& fun) : m_Fun(fun) {}
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result_type operator() () const
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{
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return m_Fun();
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}
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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template< typename... ArgsT >
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result_type operator() (ArgsT const&... args) const
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{
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return m_Fun(args...);
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}
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#else
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template< typename T >
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result_type operator() (T const& arg) const
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{
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return m_Fun(arg);
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}
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template< typename T1, typename T2 >
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result_type operator() (T1 const& arg1, T2 const& arg2) const
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{
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return m_Fun(arg1, arg2);
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}
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#endif
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private:
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FunT& m_Fun;
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};
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template< typename FunT >
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BOOST_FORCEINLINE function_reference_wrapper< FunT > fun_ref(FunT& fun)
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{
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return function_reference_wrapper< FunT >(fun);
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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_FUN_REF_HPP_INCLUDED_
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