text: /*
   *          Copyright Andrey Semashev 2007 - 2013.
   * 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_LOG_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 {}
  
  #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
      template< typename... ArgsT >
      void operator() (ArgsT const&...) const {}
  #else
      template< typename T >
      void operator() (T const&) const {}
      template< typename T1, typename T2 >
      void operator() (T1 const&, T2 const&) const {}
      template< typename T1, typename T2, typename T3 >
      void operator() (T1 const&, T2 const&, T3 const&) const {}
  #endif
  };
  
  BOOST_LOG_CLOSE_NAMESPACE // namespace log
  
  } // namespace boost
  
  #include <boost/log/detail/footer.hpp>
  
  #endif // BOOST_LOG_UTILITY_FUNCTIONAL_NOP_HPP_INCLUDED_
  