/*
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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 nop.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 a function object that does nothing.
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*/
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#ifndef BOOST_LOG_UTILITY_FUNCTIONAL_NOP_HPP_INCLUDED_
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#define BOOST_LOG_UTILITY_FUNCTIONAL_NOP_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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//! The function object that does nothing
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struct nop
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{
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typedef void result_type;
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void operator() () const BOOST_NOEXCEPT {}
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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template< typename... ArgsT >
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void operator() (ArgsT const&...) const BOOST_NOEXCEPT {}
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#else
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template< typename T >
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void operator() (T const&) const BOOST_NOEXCEPT {}
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template< typename T1, typename T2 >
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void operator() (T1 const&, T2 const&) const BOOST_NOEXCEPT {}
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template< typename T1, typename T2, typename T3 >
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void operator() (T1 const&, T2 const&, T3 const&) const BOOST_NOEXCEPT {}
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#endif
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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_NOP_HPP_INCLUDED_
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