mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2014 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
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)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_DETAIL_INTEGER_INTEGER_MASK_HPP
|
|
#define SPROUT_DETAIL_INTEGER_INTEGER_MASK_HPP
|
|
|
|
#include <climits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/workaround/std/cstddef.hpp>
|
|
#include <sprout/limits.hpp>
|
|
#include <sprout/detail/integer.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
template<std::size_t Bits>
|
|
struct high_bit_mask_t {
|
|
public:
|
|
typedef typename sprout::detail::uint_t<(Bits + 1)>::least least;
|
|
typedef typename sprout::detail::uint_t<(Bits + 1)>::fast fast;
|
|
public:
|
|
SPROUT_STATIC_CONSTEXPR least high_bit = least(1u) << Bits;
|
|
SPROUT_STATIC_CONSTEXPR fast high_bit_fast = fast(1u) << Bits;
|
|
SPROUT_STATIC_CONSTEXPR std::size_t bit_position = Bits;
|
|
};
|
|
|
|
template<std::size_t Bits>
|
|
struct low_bits_mask_t {
|
|
public:
|
|
typedef typename sprout::detail::uint_t<Bits>::least least;
|
|
typedef typename sprout::detail::uint_t<Bits>::fast fast;
|
|
public:
|
|
SPROUT_STATIC_CONSTEXPR least sig_bits = ~(~(least(0u)) << Bits);
|
|
SPROUT_STATIC_CONSTEXPR fast sig_bits_fast = fast(sig_bits);
|
|
SPROUT_STATIC_CONSTEXPR std::size_t bit_count = Bits;
|
|
};
|
|
|
|
#define SPROUT_LOW_BITS_MASK_SPECIALIZE(TYPE) \
|
|
template<> \
|
|
struct low_bits_mask_t<sprout::numeric_limits<TYPE>::digits> { \
|
|
public: \
|
|
typedef sprout::numeric_limits<TYPE> limits_type; \
|
|
typedef typename sprout::detail::uint_t<limits_type::digits>::least least; \
|
|
typedef typename sprout::detail::uint_t<limits_type::digits>::fast fast; \
|
|
public: \
|
|
SPROUT_STATIC_CONSTEXPR least sig_bits = ~(least(0u)); \
|
|
SPROUT_STATIC_CONSTEXPR fast sig_bits_fast = fast(sig_bits); \
|
|
SPROUT_STATIC_CONSTEXPR std::size_t bit_count = limits_type::digits; \
|
|
}
|
|
|
|
SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned char);
|
|
#if USHRT_MAX > UCHAR_MAX
|
|
SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned short);
|
|
#endif
|
|
#if UINT_MAX > USHRT_MAX
|
|
SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned int);
|
|
#endif
|
|
#if ULONG_MAX > UINT_MAX
|
|
SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned long);
|
|
#endif
|
|
#if ULLONG_MAX > ULONG_MAX
|
|
SPROUT_LOW_BITS_MASK_SPECIALIZE(unsigned long long);
|
|
#endif
|
|
|
|
#undef SPROUT_LOW_BITS_MASK_SPECIALIZE
|
|
} // namespace detail
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_DETAIL_INTEGER_INTEGER_MASK_HPP
|