flags.hpp

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#pragma once

 
#include <type_traits>
#include <utility>
 
namespace wowlib::formats {
  template <typename E> requires std::is_scoped_enum_v<E>
  [[nodiscard]] constexpr bool
  hasFlag(std::underlying_type_t<E> value, E flag) {
    return (value & std::to_underlying(flag)) == std::to_underlying(flag);
  }

  template <typename E> requires std::is_scoped_enum_v<E>
  [[nodiscard]] constexpr bool hasFlag(E value, E flag) {
    return (std::to_underlying(value) & std::to_underlying(flag)) ==
      std::to_underlying(flag);
  }

  template <typename E> requires std::is_scoped_enum_v<E>
  constexpr void setFlag(E& value, E flag, bool on = true) {
    value = static_cast<E>(on
                             ? std::to_underlying(value) |
                             std::to_underlying(flag)
                             : std::to_underlying(value) &
                             ~std::to_underlying(flag));
  }
}