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1 | /* |
2 | * Distributed under the Boost Software License, Version 1.0. | |
3 | * (See accompanying file LICENSE_1_0.txt or copy at | |
4 | * http://www.boost.org/LICENSE_1_0.txt) | |
5 | * | |
6 | * Copyright (c) 2009 Helge Bahmann | |
7 | * Copyright (c) 2012 Tim Blechmann | |
8 | * Copyright (c) 2013 - 2014 Andrey Semashev | |
9 | */ | |
10 | /*! | |
11 | * \file atomic/detail/bitwise_cast.hpp | |
12 | * | |
13 | * This header defines \c bitwise_cast used to convert between storage and value types | |
14 | */ | |
15 | ||
16 | #ifndef BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_ | |
17 | #define BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_ | |
18 | ||
19 | #include <boost/atomic/detail/config.hpp> | |
20 | #if !defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCPY) | |
21 | #include <cstring> | |
22 | #endif | |
23 | ||
24 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
25 | #pragma once | |
26 | #endif | |
27 | ||
28 | namespace boost { | |
29 | namespace atomics { | |
30 | namespace detail { | |
31 | ||
32 | template< typename To, typename From > | |
33 | BOOST_FORCEINLINE To bitwise_cast(From const& from) BOOST_NOEXCEPT | |
34 | { | |
35 | struct | |
36 | { | |
37 | To to; | |
38 | } | |
39 | value = {}; | |
40 | BOOST_ATOMIC_DETAIL_MEMCPY | |
41 | ( | |
42 | &reinterpret_cast< char& >(value.to), | |
43 | &reinterpret_cast< const char& >(from), | |
44 | (sizeof(From) < sizeof(To) ? sizeof(From) : sizeof(To)) | |
45 | ); | |
46 | return value.to; | |
47 | } | |
48 | ||
49 | } // namespace detail | |
50 | } // namespace atomics | |
51 | } // namespace boost | |
52 | ||
53 | #endif // BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_ |