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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) 2018 Andrey Semashev | |
7 | */ | |
8 | /*! | |
9 | * \file atomic/detail/bitwise_fp_cast.hpp | |
10 | * | |
11 | * This header defines \c bitwise_fp_cast used to convert between storage and floating point value types | |
12 | */ | |
13 | ||
14 | #ifndef BOOST_ATOMIC_DETAIL_BITWISE_FP_CAST_HPP_INCLUDED_ | |
15 | #define BOOST_ATOMIC_DETAIL_BITWISE_FP_CAST_HPP_INCLUDED_ | |
16 | ||
17 | #include <cstddef> | |
18 | #include <boost/atomic/detail/config.hpp> | |
19 | #include <boost/atomic/detail/float_sizes.hpp> | |
20 | #include <boost/atomic/detail/bitwise_cast.hpp> | |
20effc67 | 21 | #include <boost/atomic/detail/header.hpp> |
11fdf7f2 TL |
22 | |
23 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
24 | #pragma once | |
25 | #endif | |
26 | ||
27 | namespace boost { | |
28 | namespace atomics { | |
29 | namespace detail { | |
30 | ||
31 | /*! | |
32 | * \brief The type trait returns the size of the value of the specified floating point type | |
33 | * | |
34 | * This size may be less than <tt>sizeof(T)</tt> if the implementation uses padding bytes for a particular FP type. This is | |
35 | * often the case with 80-bit extended double, which is stored in 12 or 16 bytes with padding filled with garbage. | |
36 | */ | |
37 | template< typename T > | |
38 | struct value_sizeof | |
39 | { | |
40 | static BOOST_CONSTEXPR_OR_CONST std::size_t value = sizeof(T); | |
41 | }; | |
42 | ||
43 | #if defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE) | |
44 | template< > | |
45 | struct value_sizeof< float > | |
46 | { | |
47 | static BOOST_CONSTEXPR_OR_CONST std::size_t value = BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE; | |
48 | }; | |
49 | #endif | |
50 | ||
51 | #if defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE) | |
52 | template< > | |
53 | struct value_sizeof< double > | |
54 | { | |
55 | static BOOST_CONSTEXPR_OR_CONST std::size_t value = BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE; | |
56 | }; | |
57 | #endif | |
58 | ||
59 | #if defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE) | |
60 | template< > | |
61 | struct value_sizeof< long double > | |
62 | { | |
63 | static BOOST_CONSTEXPR_OR_CONST std::size_t value = BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE; | |
64 | }; | |
65 | #endif | |
66 | ||
67 | template< typename T > | |
68 | struct value_sizeof< const T > : value_sizeof< T > {}; | |
69 | ||
70 | template< typename T > | |
71 | struct value_sizeof< volatile T > : value_sizeof< T > {}; | |
72 | ||
73 | template< typename T > | |
74 | struct value_sizeof< const volatile T > : value_sizeof< T > {}; | |
75 | ||
76 | ||
77 | template< typename To, typename From > | |
78 | BOOST_FORCEINLINE To bitwise_fp_cast(From const& from) BOOST_NOEXCEPT | |
79 | { | |
80 | return atomics::detail::bitwise_cast< To, atomics::detail::value_sizeof< From >::value >(from); | |
81 | } | |
82 | ||
83 | } // namespace detail | |
84 | } // namespace atomics | |
85 | } // namespace boost | |
86 | ||
20effc67 TL |
87 | #include <boost/atomic/detail/footer.hpp> |
88 | ||
11fdf7f2 | 89 | #endif // BOOST_ATOMIC_DETAIL_BITWISE_FP_CAST_HPP_INCLUDED_ |