mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_DETAIL_INTEGER_INTEGER_MASK_HPP
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#define SPROUT_DETAIL_INTEGER_INTEGER_MASK_HPP
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#include <climits>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/detail/integer.hpp>
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namespace sprout {
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namespace detail {
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template<std::size_t Bits>
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struct high_bit_mask_t {
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public:
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typedef typename sprout::detail::uint_t<(Bits + 1)>::least least;
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typedef typename sprout::detail::uint_t<(Bits + 1)>::fast fast;
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public:
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SPROUT_STATIC_CONSTEXPR least high_bit = least(1u) << Bits;
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SPROUT_STATIC_CONSTEXPR fast high_bit_fast = fast(1u) << Bits;
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SPROUT_STATIC_CONSTEXPR std::size_t bit_position = Bits;
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};
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template<std::size_t Bits>
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struct low_bits_mask_t {
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public:
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typedef typename sprout::detail::uint_t<Bits>::least least;
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typedef typename sprout::detail::uint_t<Bits>::fast fast;
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public:
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SPROUT_STATIC_CONSTEXPR least sig_bits = ~(~(least(0u)) << Bits);
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SPROUT_STATIC_CONSTEXPR fast sig_bits_fast = fast(sig_bits);
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SPROUT_STATIC_CONSTEXPR std::size_t bit_count = Bits;
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};
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#define SPROUT_LOW_BITS_MASK_SPECIALIZE(TYPE) \
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template<> \
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struct low_bits_mask_t<sprout::numeric_limits<TYPE>::digits> { \
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public: \
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typedef sprout::numeric_limits<TYPE> limits_type; \
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typedef typename sprout::detail::uint_t<limits_type::digits>::least least; \
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typedef typename sprout::detail::uint_t<limits_type::digits>::fast fast; \
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public: \
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SPROUT_STATIC_CONSTEXPR least sig_bits = ~(least(0u)); \
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SPROUT_STATIC_CONSTEXPR fast sig_bits_fast = fast(sig_bits); \
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SPROUT_STATIC_CONSTEXPR std::size_t bit_count = limits_type::digits; \
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}
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SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned char);
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#if USHRT_MAX > UCHAR_MAX
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SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned short);
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#endif
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#if UINT_MAX > USHRT_MAX
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SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned int);
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#endif
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#if ULONG_MAX > UINT_MAX
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SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned long);
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#endif
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#if ULLONG_MAX > ULONG_MAX
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SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned long long);
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#endif
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#undef SPROUT_LOW_BITS_MASK_SPECIALIZE
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_INTEGER_INTEGER_MASK_HPP
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