ceph/src/boost/libs/log/include/boost/log/detail/copy_cv.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   copy_cv.hpp
   9  * \author Andrey Semashev
  10  * \date   16.03.2014
  11  *
  12  * The header defines \c copy_cv type trait which copies const/volatile qualifiers from one type to another
  13  */
  14
  15 #ifndef BOOST_LOG_DETAIL_COPY_CV_HPP_INCLUDED_
  16 #define BOOST_LOG_DETAIL_COPY_CV_HPP_INCLUDED_
  17
  18 #include <boost/log/detail/config.hpp>
  19 #include <boost/log/detail/header.hpp>
  20
  21 #ifdef BOOST_HAS_PRAGMA_ONCE
  22 #pragma once
  23 #endif
  24
  25 namespace boost {
  26
  27 BOOST_LOG_OPEN_NAMESPACE
  28
  29 namespace aux {
  30
  31 //! The type trait copies top level const/volatile qualifiers from \c FromT to \c ToT
  32 template< typename FromT, typename ToT >
  33 struct copy_cv
  34 {
  35     typedef ToT type;
  36 };
  37
  38 template< typename FromT, typename ToT >
  39 struct copy_cv< const FromT, ToT >
  40 {
  41     typedef const ToT type;
  42 };
  43
  44 template< typename FromT, typename ToT >
  45 struct copy_cv< volatile FromT, ToT >
  46 {
  47     typedef volatile ToT type;
  48 };
  49
  50 template< typename FromT, typename ToT >
  51 struct copy_cv< const volatile FromT, ToT >
  52 {
  53     typedef const volatile ToT type;
  54 };
  55
  56 } // namespace aux
  57
  58 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  59
  60 } // namespace boost
  61
  62 #include <boost/log/detail/footer.hpp>
  63
  64 #endif // BOOST_LOG_DETAIL_COPY_CV_HPP_INCLUDED_