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87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
/*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* Copyright (c) 2018 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/bitwise_fp_cast.hpp
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*
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* This header defines \c bitwise_fp_cast used to convert between storage and floating point value types
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*/
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#ifndef BOOST_ATOMIC_DETAIL_BITWISE_FP_CAST_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_BITWISE_FP_CAST_HPP_INCLUDED_
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#include <cstddef>
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#include <boost/atomic/detail/config.hpp>
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#include <boost/atomic/detail/float_sizes.hpp>
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#include <boost/atomic/detail/bitwise_cast.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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namespace atomics {
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namespace detail {
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/*!
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* \brief The type trait returns the size of the value of the specified floating point type
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*
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* This size may be less than <tt>sizeof(T)</tt> if the implementation uses padding bytes for a particular FP type. This is
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* often the case with 80-bit extended double, which is stored in 12 or 16 bytes with padding filled with garbage.
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*/
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template< typename T >
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struct value_sizeof
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{
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static BOOST_CONSTEXPR_OR_CONST std::size_t value = sizeof(T);
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};
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#if defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE)
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template< >
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struct value_sizeof< float >
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{
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static BOOST_CONSTEXPR_OR_CONST std::size_t value = BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE;
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};
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#endif
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#if defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE)
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template< >
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struct value_sizeof< double >
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{
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static BOOST_CONSTEXPR_OR_CONST std::size_t value = BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE;
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};
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#endif
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#if defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE)
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template< >
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struct value_sizeof< long double >
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{
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static BOOST_CONSTEXPR_OR_CONST std::size_t value = BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE;
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};
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#endif
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template< typename T >
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struct value_sizeof< const T > : value_sizeof< T > {};
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template< typename T >
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struct value_sizeof< volatile T > : value_sizeof< T > {};
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template< typename T >
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struct value_sizeof< const volatile T > : value_sizeof< T > {};
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template< typename To, typename From >
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BOOST_FORCEINLINE To bitwise_fp_cast(From const& from) BOOST_NOEXCEPT
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{
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return atomics::detail::bitwise_cast< To, atomics::detail::value_sizeof< From >::value >(from);
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}
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} // namespace detail
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} // namespace atomics
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} // namespace boost
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#endif // BOOST_ATOMIC_DETAIL_BITWISE_FP_CAST_HPP_INCLUDED_
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