Class EnumSet

test-app/runtime/src/main/cpp/v8_inspector/src/base/enum-set.h:18–87

// values), fitting into an integral type T.
template <class E, class T = int>
class EnumSet {
  static_assert(std::is_enum<E>::value, "EnumSet can only be used with enums");

 public:
  constexpr EnumSet() = default;

  explicit constexpr EnumSet(std::initializer_list<E> init) {
    T bits = 0;
    for (E e : init) bits |= Mask(e);
    bits_ = bits;
  }

  constexpr bool empty() const { return bits_ == 0; }
  constexpr bool contains(E element) const {
    return (bits_ & Mask(element)) != 0;
  }
  constexpr bool contains_any(EnumSet set) const {
    return (bits_ & set.bits_) != 0;
  }
  void Add(E element) { bits_ |= Mask(element); }
  void Add(EnumSet set) { bits_ |= set.bits_; }
  void Remove(E element) { bits_ &= ~Mask(element); }
  void Remove(EnumSet set) { bits_ &= ~set.bits_; }
  void RemoveAll() { bits_ = 0; }
  void Intersect(EnumSet set) { bits_ &= set.bits_; }
  constexpr T ToIntegral() const { return bits_; }

  constexpr bool operator==(EnumSet set) const { return bits_ == set.bits_; }
  constexpr bool operator!=(EnumSet set) const { return bits_ != set.bits_; }

  constexpr EnumSet operator|(EnumSet set) const {
    return EnumSet(bits_ | set.bits_);
  }
  constexpr EnumSet operator&(EnumSet set) const {
    return EnumSet(bits_ & set.bits_);
  }
  constexpr EnumSet operator-(EnumSet set) const {
    return EnumSet(bits_ & ~set.bits_);
  }

  EnumSet& operator|=(EnumSet set) { return *this = *this | set; }
  EnumSet& operator&=(EnumSet set) { return *this = *this & set; }
  EnumSet& operator-=(EnumSet set) { return *this = *this - set; }

  constexpr EnumSet operator|(E element) const {
    return EnumSet(bits_ | Mask(element));
  }
  constexpr EnumSet operator&(E element) const {
    return EnumSet(bits_ & Mask(element));
  }
  constexpr EnumSet operator-(E element) const {
    return EnumSet(bits_ & ~Mask(element));
  }

  EnumSet& operator|=(E element) { return *this = *this | element; }
  EnumSet& operator&=(E element) { return *this = *this & element; }
  EnumSet& operator-=(E element) { return *this = *this - element; }