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https://github.com/bolero-MURAKAMI/Sprout
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182
sprout/detail/integer.hpp
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182
sprout/detail/integer.hpp
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#ifndef SPROUT_DETAIL_INTEGER_HPP
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#define SPROUT_DETAIL_INTEGER_HPP
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#include <climits>
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#include <limits>
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#include <sprout/config.hpp>
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namespace sprout {
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namespace detail {
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template<typename LeastInt>
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struct int_fast_t {
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typedef LeastInt fast;
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typedef fast type;
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};
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template<int Category>
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struct int_least_helper {};
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template<>
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struct int_least_helper<1> {
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typedef long long least;
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};
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template<>
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struct int_least_helper<2> {
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typedef long least;
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};
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template<>
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struct int_least_helper<3> {
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typedef int least;
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};
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template<>
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struct int_least_helper<4> {
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typedef short least;
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};
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template<>
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struct int_least_helper<5> {
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typedef signed char least;
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};
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template<>
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struct int_least_helper<6> {
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typedef unsigned long long least;
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};
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template<>
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struct int_least_helper<7> {
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typedef unsigned long least;
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};
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template<>
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struct int_least_helper<8> {
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typedef unsigned int least;
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};
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template<>
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struct int_least_helper<9> {
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typedef unsigned short least;
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};
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template<>
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struct int_least_helper<10> {
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typedef unsigned char least;
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};
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template<int Bits>
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struct exact_signed_base_helper {};
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template<int Bits>
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struct exact_unsigned_base_helper {};
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template<>
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struct exact_signed_base_helper<sizeof(signed char) * CHAR_BIT> {
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typedef signed char exact;
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};
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template<>
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struct exact_unsigned_base_helper<sizeof(unsigned char) * CHAR_BIT> {
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typedef unsigned char exact;
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};
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#if USHRT_MAX != UCHAR_MAX
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template<>
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struct exact_signed_base_helper<sizeof(short) * CHAR_BIT> {
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typedef short exact;
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};
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template<> struct exact_unsigned_base_helper<sizeof(unsigned short) * CHAR_BIT> {
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typedef unsigned short exact;
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};
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#endif
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#if UINT_MAX != USHRT_MAX
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template<>
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struct exact_signed_base_helper<sizeof(int) * CHAR_BIT> {
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typedef int exact;
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};
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template<>
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struct exact_unsigned_base_helper<sizeof(unsigned int) * CHAR_BIT> {
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typedef unsigned int exact;
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};
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#endif
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#if ULONG_MAX != UINT_MAX
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template<>
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struct exact_signed_base_helper<sizeof(long) * CHAR_BIT> {
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typedef long exact;
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};
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template<>
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struct exact_unsigned_base_helper<sizeof(unsigned long) * CHAR_BIT> {
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typedef unsigned long exact;
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};
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#endif
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#if ULLONG_MAX != ULONG_MAX
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template<>
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struct exact_signed_base_helper<sizeof(long long) * CHAR_BIT> {
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typedef long long exact;
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};
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template<>
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struct exact_unsigned_base_helper<sizeof(unsigned long long) * CHAR_BIT> {
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typedef unsigned long long exact;
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};
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#endif
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template<int Bits>
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struct int_t
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: public sprout::detail::exact_signed_base_helper<Bits>
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{
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typedef typename sprout::detail::int_least_helper<
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0
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+ (Bits - 1 <= std::numeric_limits<long long>::digits)
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+ (Bits - 1 <= std::numeric_limits<long>::digits)
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+ (Bits - 1 <= std::numeric_limits<int>::digits)
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+ (Bits - 1 <= std::numeric_limits<short>::digits)
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+ (Bits - 1 <= std::numeric_limits<signed char>::digits)
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>::least least;
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typedef typename sprout::detail::int_fast_t<least>::type fast;
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};
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template<int Bits>
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struct uint_t
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: public sprout::detail::exact_unsigned_base_helper<Bits>
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{
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typedef typename sprout::detail::int_least_helper<
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5
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+ (Bits <= std::numeric_limits<unsigned long long>::digits)
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+ (Bits <= std::numeric_limits<unsigned long>::digits)
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+ (Bits <= std::numeric_limits<unsigned int>::digits)
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+ (Bits <= std::numeric_limits<unsigned short>::digits)
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+ (Bits <= std::numeric_limits<unsigned char>::digits)
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>::least least;
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typedef typename sprout::detail::int_fast_t<least>::type fast;
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};
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template<long long MaxValue>
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struct int_max_value_t {
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typedef typename sprout::detail::int_least_helper<
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0
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+ (MaxValue <= std::numeric_limits<long long>::max())
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+ (MaxValue <= std::numeric_limits<long>::max())
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+ (MaxValue <= std::numeric_limits<int>::max())
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+ (MaxValue <= std::numeric_limits<short>::max())
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+ (MaxValue <= std::numeric_limits<signed char>::max())
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>::least least;
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typedef typename sprout::detail::int_fast_t<least>::type fast;
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};
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template<long long MinValue>
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struct int_min_value_t {
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typedef typename sprout::detail::int_least_helper<
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0
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+ (MinValue >= std::numeric_limits<long long>::min())
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+ (MinValue >= std::numeric_limits<long>::min())
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+ (MinValue >= std::numeric_limits<int>::min())
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+ (MinValue >= std::numeric_limits<short>::min())
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+ (MinValue >= std::numeric_limits<signed char>::min())
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>::least least;
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typedef typename sprout::detail::int_fast_t<least>::type fast;
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};
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template<unsigned long long MaxValue>
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struct uint_value_t {
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typedef typename sprout::detail::int_least_helper<
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5
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+ (MaxValue <= std::numeric_limits<long long>::max())
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+ (MaxValue <= std::numeric_limits<long>::max())
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+ (MaxValue <= std::numeric_limits<int>::max())
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+ (MaxValue <= std::numeric_limits<short>::max())
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+ (MaxValue <= std::numeric_limits<signed char>::max())
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>::least least;
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typedef typename sprout::detail::int_fast_t<least>::type fast;
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};
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_INTEGER_HPP
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66
sprout/detail/integer/integer_mask.hpp
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66
sprout/detail/integer/integer_mask.hpp
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@ -0,0 +1,66 @@
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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 <cstddef>
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#include <climits>
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#include <limits>
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#include <sprout/config.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<std::numeric_limits<Type>::digits> { \
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public: \
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typedef std::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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