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   nop.hpp
Chris@16:  * \author Andrey Semashev
Chris@16:  * \date   30.03.2008
Chris@16:  *
Chris@16:  * This header contains a function object that does nothing.
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_LOG_UTILITY_FUNCTIONAL_NOP_HPP_INCLUDED_
Chris@16: #define BOOST_LOG_UTILITY_FUNCTIONAL_NOP_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: //! The function object that does nothing
Chris@16: struct nop
Chris@16: {
Chris@16:     typedef void result_type;
Chris@16: 
Chris@16:     void operator() () const BOOST_NOEXCEPT {}
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
Chris@16:     template< typename... ArgsT >
Chris@16:     void operator() (ArgsT const&...) const BOOST_NOEXCEPT {}
Chris@16: #else
Chris@16:     template< typename T >
Chris@16:     void operator() (T const&) const BOOST_NOEXCEPT {}
Chris@16:     template< typename T1, typename T2 >
Chris@16:     void operator() (T1 const&, T2 const&) const BOOST_NOEXCEPT {}
Chris@16:     template< typename T1, typename T2, typename T3 >
Chris@16:     void operator() (T1 const&, T2 const&, T3 const&) const BOOST_NOEXCEPT {}
Chris@16: #endif
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_NOP_HPP_INCLUDED_