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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/atomic/detail/integral_extend.hpp')
-rw-r--r-- | src/third_party/boost-1.69.0/boost/atomic/detail/integral_extend.hpp | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/atomic/detail/integral_extend.hpp b/src/third_party/boost-1.69.0/boost/atomic/detail/integral_extend.hpp new file mode 100644 index 00000000000..dea48ac6fe4 --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/atomic/detail/integral_extend.hpp @@ -0,0 +1,105 @@ +/* + * 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) 2018 Andrey Semashev + */ +/*! + * \file atomic/detail/integral_extend.hpp + * + * This header defines sign/zero extension utilities for Boost.Atomic. The tools assume two's complement signed integer representation. + */ + +#ifndef BOOST_ATOMIC_DETAIL_INTEGRAL_EXTEND_HPP_INCLUDED_ +#define BOOST_ATOMIC_DETAIL_INTEGRAL_EXTEND_HPP_INCLUDED_ + +#include <boost/atomic/detail/config.hpp> +#include <boost/atomic/detail/bitwise_cast.hpp> +#include <boost/atomic/detail/type_traits/integral_constant.hpp> +#include <boost/atomic/detail/type_traits/is_signed.hpp> +#include <boost/atomic/detail/type_traits/make_signed.hpp> +#include <boost/atomic/detail/type_traits/make_unsigned.hpp> + +#ifdef BOOST_HAS_PRAGMA_ONCE +#pragma once +#endif + +namespace boost { +namespace atomics { +namespace detail { + +template< typename Output, typename Input > +BOOST_FORCEINLINE Output zero_extend_impl(Input input, atomics::detail::true_type) BOOST_NOEXCEPT +{ + // Note: If we are casting with truncation or to the same-sized output, don't cause signed integer overflow by this chain of conversions + return atomics::detail::bitwise_cast< Output >(static_cast< typename atomics::detail::make_unsigned< Output >::type >( + static_cast< typename atomics::detail::make_unsigned< Input >::type >(input))); +} + +template< typename Output, typename Input > +BOOST_FORCEINLINE Output zero_extend_impl(Input input, atomics::detail::false_type) BOOST_NOEXCEPT +{ + return static_cast< Output >(static_cast< typename atomics::detail::make_unsigned< Input >::type >(input)); +} + +//! Zero-extends or truncates (wraps) input operand to fit in the output type +template< typename Output, typename Input > +BOOST_FORCEINLINE Output zero_extend(Input input) BOOST_NOEXCEPT +{ + return atomics::detail::zero_extend_impl< Output >(input, atomics::detail::integral_constant< bool, atomics::detail::is_signed< Output >::value >()); +} + +//! Truncates (wraps) input operand to fit in the output type +template< typename Output, typename Input > +BOOST_FORCEINLINE Output integral_truncate(Input input) BOOST_NOEXCEPT +{ + // zero_extend does the truncation + return atomics::detail::zero_extend< Output >(input); +} + +template< typename Output, typename Input > +BOOST_FORCEINLINE Output sign_extend_impl(Input input, atomics::detail::true_type) BOOST_NOEXCEPT +{ + return atomics::detail::integral_truncate< Output >(input); +} + +template< typename Output, typename Input > +BOOST_FORCEINLINE Output sign_extend_impl(Input input, atomics::detail::false_type) BOOST_NOEXCEPT +{ + return static_cast< Output >(atomics::detail::bitwise_cast< typename atomics::detail::make_signed< Input >::type >(input)); +} + +//! Sign-extends or truncates (wraps) input operand to fit in the output type +template< typename Output, typename Input > +BOOST_FORCEINLINE Output sign_extend(Input input) BOOST_NOEXCEPT +{ + return atomics::detail::sign_extend_impl< Output >(input, atomics::detail::integral_constant< bool, sizeof(Output) <= sizeof(Input) >()); +} + +//! Sign-extends or truncates (wraps) input operand to fit in the output type +template< typename Output, typename Input > +BOOST_FORCEINLINE Output integral_extend(Input input, atomics::detail::true_type) BOOST_NOEXCEPT +{ + return atomics::detail::sign_extend< Output >(input); +} + +//! Zero-extends or truncates (wraps) input operand to fit in the output type +template< typename Output, typename Input > +BOOST_FORCEINLINE Output integral_extend(Input input, atomics::detail::false_type) BOOST_NOEXCEPT +{ + return atomics::detail::zero_extend< Output >(input); +} + +//! Sign- or zero-extends or truncates (wraps) input operand to fit in the output type +template< bool Signed, typename Output, typename Input > +BOOST_FORCEINLINE Output integral_extend(Input input) BOOST_NOEXCEPT +{ + return atomics::detail::integral_extend< Output >(input, atomics::detail::integral_constant< bool, Signed >()); +} + +} // namespace detail +} // namespace atomics +} // namespace boost + +#endif // BOOST_ATOMIC_DETAIL_INTEGRAL_EXTEND_HPP_INCLUDED_ |