/
int_traits.hpp
58 lines (47 loc) · 2.03 KB
/
int_traits.hpp
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#pragma once
#include <cstddef>
#include <cstdint>
namespace cu
{
template <typename T>
struct IntTraits;
namespace detail
{
template <std::size_t nBits_,
bool isSigned_>
struct IntTraitsImpl
{
static constexpr std::size_t nBits = nBits_;
static constexpr bool isSigned = isSigned_;
};
}
template <> struct IntTraits<std:: int8_t> : detail::IntTraitsImpl< 8, true> {};
template <> struct IntTraits<std:: int16_t> : detail::IntTraitsImpl<16, true> {};
template <> struct IntTraits<std:: int32_t> : detail::IntTraitsImpl<32, true> {};
template <> struct IntTraits<std:: int64_t> : detail::IntTraitsImpl<64, true> {};
template <> struct IntTraits<std:: uint8_t> : detail::IntTraitsImpl< 8,false> {};
template <> struct IntTraits<std::uint16_t> : detail::IntTraitsImpl<16,false> {};
template <> struct IntTraits<std::uint32_t> : detail::IntTraitsImpl<32,false> {};
template <> struct IntTraits<std::uint64_t> : detail::IntTraitsImpl<64,false> {};
namespace detail
{
template <std::size_t nBits,
bool isSigned>
struct BuildInIntImpl;
template <typename T>
struct TypeTrait { using type = T; };
template <> struct BuildInIntImpl< 8, true> : TypeTrait<std:: int8_t> {};
template <> struct BuildInIntImpl<16, true> : TypeTrait<std:: int16_t> {};
template <> struct BuildInIntImpl<32, true> : TypeTrait<std:: int32_t> {};
template <> struct BuildInIntImpl<64, true> : TypeTrait<std:: int64_t> {};
template <> struct BuildInIntImpl< 8,false> : TypeTrait<std:: uint8_t> {};
template <> struct BuildInIntImpl<16,false> : TypeTrait<std::uint16_t> {};
template <> struct BuildInIntImpl<32,false> : TypeTrait<std::uint32_t> {};
template <> struct BuildInIntImpl<64,false> : TypeTrait<std::uint64_t> {};
}
template <std::size_t nBits,
bool isSigned = true>
using BuildInInt = typename detail::BuildInIntImpl<nBits,isSigned>::type;
template <typename IntT>
using DoubleSizeInt = BuildInInt<IntTraits<IntT>::nBits*2,IntTraits<IntT>::isSigned>;
} // namespace cu