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/*
* Copyright Andrey Semashev 2007 - 2014.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
/*!
* \file nop.hpp
* \author Andrey Semashev
* \date 30.03.2008
*
* This header contains a function object that does nothing.
*/
#ifndef BOOST_LOG_UTILITY_FUNCTIONAL_NOP_HPP_INCLUDED_
#define BOOST_LOG_UTILITY_FUNCTIONAL_NOP_HPP_INCLUDED_
#include <boost/log/detail/config.hpp>
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
//! The function object that does nothing
struct nop
{
typedef void result_type;
void operator() () const BOOST_NOEXCEPT {}
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
template< typename... ArgsT >
void operator() (ArgsT const&...) const BOOST_NOEXCEPT {}
#else
template< typename T >
void operator() (T const&) const BOOST_NOEXCEPT {}
template< typename T1, typename T2 >
void operator() (T1 const&, T2 const&) const BOOST_NOEXCEPT {}
template< typename T1, typename T2, typename T3 >
void operator() (T1 const&, T2 const&, T3 const&) const BOOST_NOEXCEPT {}
#endif
};
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_UTILITY_FUNCTIONAL_NOP_HPP_INCLUDED_
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