type.hpp

#pragma once
 
#include <cstdint>
 
namespace cplib::impl {
 
template <typename T>
struct make_double_width {};
template <>
struct make_double_width<uint8_t> {
  using type = uint16_t;
};
template <>
struct make_double_width<uint16_t> {
  using type = uint32_t;
};
template <>
struct make_double_width<uint32_t> {
  using type = uint64_t;
};
template <>
struct make_double_width<uint64_t> {
  using type = unsigned __int128;
};
template <>
struct make_double_width<unsigned long long> {
  using type = unsigned __int128;
};
template <>
struct make_double_width<int8_t> {
  using type = int16_t;
};
template <>
struct make_double_width<int16_t> {
  using type = int32_t;
};
template <>
struct make_double_width<int32_t> {
  using type = int64_t;
};
template <>
struct make_double_width<int64_t> {
  using type = __int128;
};
template <>
struct make_double_width<long long> {
  using type = __int128;
};
 
template <typename T>
using make_double_width_t = typename make_double_width<T>::type;
 
}  // namespace cplib::impl