diff options
Diffstat (limited to 'boost/atomic/detail/bitwise_cast.hpp')
-rw-r--r-- | boost/atomic/detail/bitwise_cast.hpp | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/boost/atomic/detail/bitwise_cast.hpp b/boost/atomic/detail/bitwise_cast.hpp new file mode 100644 index 0000000000..8654d10b95 --- /dev/null +++ b/boost/atomic/detail/bitwise_cast.hpp @@ -0,0 +1,53 @@ +/* + * Distributed under the Boost Software License, Version 1.0. + * (See accompanying file LICENSE_1_0.txt or copy at + * http://www.boost.org/LICENSE_1_0.txt) + * + * Copyright (c) 2009 Helge Bahmann + * Copyright (c) 2012 Tim Blechmann + * Copyright (c) 2013 - 2014 Andrey Semashev + */ +/*! + * \file atomic/detail/bitwise_cast.hpp + * + * This header defines \c bitwise_cast used to convert between storage and value types + */ + +#ifndef BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_ +#define BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_ + +#include <boost/atomic/detail/config.hpp> +#if !defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCPY) +#include <cstring> +#endif + +#ifdef BOOST_HAS_PRAGMA_ONCE +#pragma once +#endif + +namespace boost { +namespace atomics { +namespace detail { + +template< typename To, typename From > +BOOST_FORCEINLINE To bitwise_cast(From const& from) BOOST_NOEXCEPT +{ + struct + { + To to; + } + value = {}; + BOOST_ATOMIC_DETAIL_MEMCPY + ( + &reinterpret_cast< char& >(value.to), + &reinterpret_cast< const char& >(from), + (sizeof(From) < sizeof(To) ? sizeof(From) : sizeof(To)) + ); + return value.to; +} + +} // namespace detail +} // namespace atomics +} // namespace boost + +#endif // BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_ |