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_ 65