ceph/src/boost/libs/log/include/boost/log/utility/unused_variable.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   unused_variable.hpp
   9  * \author Andrey Semashev
  10  * \date   10.05.2008
  11  *
  12  * The header contains definition of a macro to suppress compiler warnings about unused variables.
  13  */
  14
  15 #ifndef BOOST_LOG_UTILITY_UNUSED_VARIABLE_HPP_INCLUDED_
  16 #define BOOST_LOG_UTILITY_UNUSED_VARIABLE_HPP_INCLUDED_
  17
  18 #include <boost/log/detail/config.hpp>
  19
  20 #ifdef BOOST_HAS_PRAGMA_ONCE
  21 #pragma once
  22 #endif
  23
  24 #if defined(__GNUC__)
  25
  26 //! The macro suppresses compiler warnings for \c var being unused
  27 #define BOOST_LOG_UNUSED_VARIABLE(type, var, initializer) __attribute__((unused)) type var initializer
  28
  29 #else
  30
  31 namespace boost {
  32
  33 BOOST_LOG_OPEN_NAMESPACE
  34
  35 namespace aux {
  36
  37 template< typename T >
  38 BOOST_FORCEINLINE void no_unused_warnings(T const&) BOOST_NOEXCEPT {}
  39
  40 } // namespace aux
  41
  42 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  43
  44 } // namespace boost
  45
  46 //! The macro suppresses compiler warnings for \c var being unused
  47 #define BOOST_LOG_UNUSED_VARIABLE(type, var, initializer) type var initializer; ::boost::log::aux::no_unused_warnings(var)
  48
  49 #endif
  50
  51 #endif // BOOST_LOG_UTILITY_UNUSED_VARIABLE_HPP_INCLUDED_