move/detail/addressof.hpp

0001 //////////////////////////////////////////////////////////////////////////////
0002 //
0003 // (C) Copyright Ion Gaztanaga 2014-2015. Distributed under the Boost
0004 // Software License, Version 1.0. (See accompanying file
0005 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 //
0007 // See http://www.boost.org/libs/container for documentation.
0008 //
0009 //////////////////////////////////////////////////////////////////////////////
0010 #ifndef BOOST_MOVE_DETAIL_ADDRESSOF_HPP
0011 #define BOOST_MOVE_DETAIL_ADDRESSOF_HPP
0012
0013 #ifndef BOOST_CONFIG_HPP
0014 #  include <boost/config.hpp>
0015 #endif
0016
0017 #if defined(BOOST_HAS_PRAGMA_ONCE)
0018 #  pragma once
0019 #endif
0020
0021 #include <boost/move/detail/workaround.hpp>
0022
0023 namespace boost {
0024 namespace move_detail {
0025
0026 #if defined(BOOST_MSVC_FULL_VER) && BOOST_MSVC_FULL_VER >= 190024215
0027 #define BOOST_MOVE_HAS_BUILTIN_ADDRESSOF
0028 #elif defined(BOOST_GCC) && BOOST_GCC >= 70000
0029 #define BOOST_MOVE_HAS_BUILTIN_ADDRESSOF
0030 #elif defined(__has_builtin)
0031 #if __has_builtin(__builtin_addressof)
0032 #define BOOST_MOVE_HAS_BUILTIN_ADDRESSOF
0033 #endif
0034 #endif
0035
0036 #ifdef BOOST_MOVE_HAS_BUILTIN_ADDRESSOF
0037
0038 template<class T>
0039 BOOST_MOVE_FORCEINLINE T *addressof( T & v ) BOOST_NOEXCEPT
0040 {
0041    return __builtin_addressof(v);
0042 }
0043
0044 #else //BOOST_MOVE_HAS_BUILTIN_ADDRESSOF
0045
0046 template <typename T>
0047 BOOST_MOVE_FORCEINLINE T* addressof(T& obj)
0048 {
0049    return static_cast<T*>(
0050       static_cast<void*>(
0051          const_cast<char*>(
0052             &reinterpret_cast<const volatile char&>(obj)
0053    )));
0054 }
0055
0056 #endif   //BOOST_MOVE_HAS_BUILTIN_ADDRESSOF
0057
0058 }  //namespace move_detail {
0059 }  //namespace boost {
0060
0061 #endif   //#ifndef BOOST_MOVE_DETAIL_ADDRESSOF_HPP