Chris@16: /*
Chris@101:  *          Copyright Andrey Semashev 2007 - 2015.
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  *    (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:  *          http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  */
Chris@16: /*!
Chris@16:  * \file   fun_ref.hpp
Chris@16:  * \author Andrey Semashev
Chris@16:  * \date   30.03.2008
Chris@16:  *
Chris@16:  * This header contains function object reference adapter. The adapter stores a reference to external
Chris@16:  * function object and forwards all calls to the referred function.
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_LOG_UTILITY_FUNCTIONAL_FUN_REF_HPP_INCLUDED_
Chris@16: #define BOOST_LOG_UTILITY_FUNCTIONAL_FUN_REF_HPP_INCLUDED_
Chris@16: 
Chris@16: #include <boost/log/detail/config.hpp>
Chris@16: #include <boost/log/detail/header.hpp>
Chris@16: 
Chris@16: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: BOOST_LOG_OPEN_NAMESPACE
Chris@16: 
Chris@16: //! Reference wrapper for function objects
Chris@16: template< typename FunT >
Chris@16: struct function_reference_wrapper
Chris@16: {
Chris@16:     typedef typename FunT::result_type result_type;
Chris@16: 
Chris@16:     explicit function_reference_wrapper(FunT& fun) : m_Fun(fun) {}
Chris@16: 
Chris@16:     result_type operator() () const
Chris@16:     {
Chris@16:         return m_Fun();
Chris@16:     }
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
Chris@16:     template< typename... ArgsT >
Chris@16:     result_type operator() (ArgsT const&... args) const
Chris@16:     {
Chris@16:         return m_Fun(args...);
Chris@16:     }
Chris@16: #else
Chris@16:     template< typename T >
Chris@16:     result_type operator() (T const& arg) const
Chris@16:     {
Chris@16:         return m_Fun(arg);
Chris@16:     }
Chris@16: 
Chris@16:     template< typename T1, typename T2 >
Chris@16:     result_type operator() (T1 const& arg1, T2 const& arg2) const
Chris@16:     {
Chris@16:         return m_Fun(arg1, arg2);
Chris@16:     }
Chris@16: #endif
Chris@16: 
Chris@16: private:
Chris@16:     FunT& m_Fun;
Chris@16: };
Chris@16: 
Chris@16: template< typename FunT >
Chris@16: BOOST_FORCEINLINE function_reference_wrapper< FunT > fun_ref(FunT& fun)
Chris@16: {
Chris@16:     return function_reference_wrapper< FunT >(fun);
Chris@16: }
Chris@16: 
Chris@16: BOOST_LOG_CLOSE_NAMESPACE // namespace log
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/log/detail/footer.hpp>
Chris@16: 
Chris@16: #endif // BOOST_LOG_UTILITY_FUNCTIONAL_FUN_REF_HPP_INCLUDED_