enum_name.hpp

/*
MIT License
 
Copyright (c) 2023 mguludag
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
 
#ifndef MGUTILITY_ENUM_NAME_HPP
#define MGUTILITY_ENUM_NAME_HPP
 
#include "detail/enum_name_impl.hpp"
 
namespace mgutility {
 
template <typename Enum>
constexpr auto enum_to_underlying(Enum e) noexcept
    -> detail::underlying_type_t<Enum> {
  static_assert(std::is_enum<Enum>::value, "Value is not an Enum type!");
  return static_cast<detail::underlying_type_t<Enum>>(e);
}
 
template <int Min, int Max, typename Enum>
MGUTILITY_CNSTXPR auto enum_name(Enum e) noexcept
    -> detail::string_or_view_t<Enum> {
  static_assert(Min < Max - 1, "Max must be greater than (Min + 1)!");
  static_assert(std::is_enum<Enum>::value, "Value is not an Enum type!");
  return detail::enum_name_impl<Enum, Min, Max>(e);
}
 
template <typename Enum, int Min = enum_range<Enum>::min,
          int Max = enum_range<Enum>::max>
MGUTILITY_CNSTXPR auto enum_name(Enum e) noexcept
    -> detail::string_or_view_t<Enum> {
  static_assert(Min < Max - 1, "Max must be greater than (Min + 1)!");
  static_assert(std::is_enum<Enum>::value, "Value is not an Enum type!");
  return detail::enum_name_impl<Enum, Min, Max>(e);
}
 
template <typename Enum>
auto enum_for_each<Enum>::enum_iter::operator*() const -> value_type {
  auto value = static_cast<Enum>(m_pos);
  return detail::enum_pair<Enum>{value, enum_name(value)};
}
 
template <typename Enum, int Min = enum_range<Enum>::min,
          int Max = enum_range<Enum>::max,
          detail::enable_if_t<!detail::has_bit_or<Enum>::value, bool> = true>
MGUTILITY_CNSTXPR auto to_enum(mgutility::string_view str) noexcept
    -> mgutility::optional<Enum> {
  static_assert(Min < Max - 1, "Max must be greater than (Min + 1)!");
  static_assert(std::is_enum<Enum>::value, "Type is not an Enum type!");
  return detail::to_enum_impl<Enum, Min, Max>(str);
}
 
template <typename Enum, int Min = enum_range<Enum>::min,
          int Max = enum_range<Enum>::max,
          detail::enable_if_t<detail::has_bit_or<Enum>::value, bool> = true>
MGUTILITY_CNSTXPR auto to_enum(mgutility::string_view str) noexcept
    -> mgutility::optional<Enum> {
  static_assert(Min < Max - 1, "Max must be greater than (Min + 1)!");
  static_assert(std::is_enum<Enum>::value, "Type is not an Enum type!");
  return detail::to_enum_bitmask_impl<Enum, Min, Max>(str);
}
 
template <typename Enum, int Min = enum_range<Enum>::min,
          int Max = enum_range<Enum>::max>
MGUTILITY_CNSTXPR auto enum_cast(int value) noexcept
    -> mgutility::optional<Enum> {
  static_assert(Min < Max - 1, "Max must be greater than (Min + 1)!");
  static_assert(std::is_enum<Enum>::value, "Type is not an Enum type!");
  if (enum_name(static_cast<Enum>(value)).empty()) {
    return mgutility::nullopt;
  }
  return static_cast<Enum>(value);
}
 
namespace operators {
template <typename Enum, mgutility::detail::enable_if_t<
                             std::is_enum<Enum>::value, bool> = true>
inline constexpr auto operator&(const Enum &lhs, const Enum &rhs) -> Enum {
  return static_cast<Enum>(mgutility::enum_to_underlying(lhs) &
                           mgutility::enum_to_underlying(rhs));
}
 
template <typename Enum, mgutility::detail::enable_if_t<
                             std::is_enum<Enum>::value, bool> = true>
inline constexpr auto operator|(const Enum &lhs, const Enum &rhs) -> Enum {
  return static_cast<Enum>(mgutility::enum_to_underlying(lhs) |
                           mgutility::enum_to_underlying(rhs));
}
} // namespace operators
 
} // namespace mgutility
 
template <typename Enum, mgutility::detail::enable_if_t<
                             std::is_enum<Enum>::value, bool> = true>
auto operator<<(std::ostream &os, Enum e) -> std::ostream & {
  static_assert(std::is_enum<Enum>::value, "Value is not an Enum type!");
  os << mgutility::enum_name(e);
  return os;
}
 
#if defined(__cpp_lib_format)
 
#include <format>
 
template <typename Enum>
  requires std::is_enum_v<Enum>
struct std::formatter<Enum> : formatter<std::string_view> {
  auto constexpr format(Enum e, format_context &ctx) const {
    return formatter<std::string_view>::format(mgutility::enum_name(e), ctx);
  }
};
 
#endif
 
#if defined(__has_include)
#if __has_include(<fmt/ostream.h>)
#include <fmt/ostream.h>
#endif
#endif
 
#endif // MGUTILITY_ENUM_NAME_HPP