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/*
* 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/storage_type.hpp
*
* This header defines underlying types used as storage
*/
#ifndef BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
#define BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
#include <cstring>
#include <boost/cstdint.hpp>
#include <boost/atomic/detail/config.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
namespace atomics {
namespace detail {
template< unsigned int Size >
struct buffer_storage
{
unsigned char data[Size];
BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT
{
bool result = true;
for (unsigned int i = 0; i < Size && result; ++i)
{
result &= data[i] == 0;
}
return result;
}
BOOST_FORCEINLINE bool operator== (buffer_storage const& that) const BOOST_NOEXCEPT
{
return std::memcmp(data, that.data, Size) == 0;
}
BOOST_FORCEINLINE bool operator!= (buffer_storage const& that) const BOOST_NOEXCEPT
{
return std::memcmp(data, that.data, Size) != 0;
}
};
template< unsigned int Size, bool Signed >
struct make_storage_type
{
typedef buffer_storage< Size > type;
};
template< >
struct make_storage_type< 1u, false >
{
typedef boost::uint8_t type;
};
template< >
struct make_storage_type< 1u, true >
{
typedef boost::int8_t type;
};
template< >
struct make_storage_type< 2u, false >
{
typedef boost::uint16_t type;
};
template< >
struct make_storage_type< 2u, true >
{
typedef boost::int16_t type;
};
template< >
struct make_storage_type< 4u, false >
{
typedef boost::uint32_t type;
};
template< >
struct make_storage_type< 4u, true >
{
typedef boost::int32_t type;
};
template< >
struct make_storage_type< 8u, false >
{
typedef boost::uint64_t type;
};
template< >
struct make_storage_type< 8u, true >
{
typedef boost::int64_t type;
};
#if defined(BOOST_HAS_INT128)
template< >
struct make_storage_type< 16u, false >
{
typedef boost::uint128_type type;
};
template< >
struct make_storage_type< 16u, true >
{
typedef boost::int128_type type;
};
#elif !defined(BOOST_NO_ALIGNMENT)
struct BOOST_ALIGNMENT(16) storage128_t
{
boost::uint64_t data[2];
BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT
{
return data[0] == 0 && data[1] == 0;
}
};
BOOST_FORCEINLINE bool operator== (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT
{
return left.data[0] == right.data[0] && left.data[1] == right.data[1];
}
BOOST_FORCEINLINE bool operator!= (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT
{
return !(left == right);
}
template< bool Signed >
struct make_storage_type< 16u, Signed >
{
typedef storage128_t type;
};
#endif
template< typename T >
struct storage_size_of
{
enum _
{
size = sizeof(T),
value = (size == 3 ? 4 : (size >= 5 && size <= 7 ? 8 : (size >= 9 && size <= 15 ? 16 : size)))
};
};
} // namespace detail
} // namespace atomics
} // namespace boost
#endif // BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
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