Vulkan-Hpp/snippets/Flags.hpp

  template <typename FlagBitsType>
  struct FlagTraits
  {};

  template <typename BitType>
  class Flags
  {
  public:
    using MaskType = typename std::underlying_type<BitType>::type;

    // constructors
    VULKAN_HPP_CONSTEXPR Flags() VULKAN_HPP_NOEXCEPT
      : m_mask( 0 )
    {}

    VULKAN_HPP_CONSTEXPR Flags( BitType bit ) VULKAN_HPP_NOEXCEPT
      : m_mask( static_cast<MaskType>( bit ) )
    {}

    VULKAN_HPP_CONSTEXPR Flags( Flags<BitType> const & rhs ) VULKAN_HPP_NOEXCEPT = default;

    VULKAN_HPP_CONSTEXPR explicit Flags( MaskType flags ) VULKAN_HPP_NOEXCEPT
      : m_mask( flags )
    {}

    // relational operators
#if defined( VULKAN_HPP_HAS_SPACESHIP_OPERATOR )
    auto operator<=>( Flags<BitType> const & ) const = default;
#else
    VULKAN_HPP_CONSTEXPR bool operator<( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return m_mask < rhs.m_mask;
    }

    VULKAN_HPP_CONSTEXPR bool operator<=( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return m_mask <= rhs.m_mask;
    }

    VULKAN_HPP_CONSTEXPR bool operator>( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return m_mask > rhs.m_mask;
    }

    VULKAN_HPP_CONSTEXPR bool operator>=( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return m_mask >= rhs.m_mask;
    }

    VULKAN_HPP_CONSTEXPR bool operator==( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return m_mask == rhs.m_mask;
    }

    VULKAN_HPP_CONSTEXPR bool operator!=( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return m_mask != rhs.m_mask;
    }
#endif

    // logical operator
    VULKAN_HPP_CONSTEXPR bool operator!() const VULKAN_HPP_NOEXCEPT
    {
      return !m_mask;
    }

    // bitwise operators
    VULKAN_HPP_CONSTEXPR Flags<BitType> operator&( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return Flags<BitType>( m_mask & rhs.m_mask );
    }

    VULKAN_HPP_CONSTEXPR Flags<BitType> operator|( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return Flags<BitType>( m_mask | rhs.m_mask );
    }

    VULKAN_HPP_CONSTEXPR Flags<BitType> operator^( Flags<BitType> const & rhs ) const VULKAN_HPP_NOEXCEPT
    {
      return Flags<BitType>( m_mask ^ rhs.m_mask );
    }

    VULKAN_HPP_CONSTEXPR Flags<BitType> operator~() const VULKAN_HPP_NOEXCEPT
    {
      return Flags<BitType>( m_mask ^ FlagTraits<BitType>::allFlags );
    }

    // assignment operators
    VULKAN_HPP_CONSTEXPR_14 Flags<BitType> & operator=( Flags<BitType> const & rhs ) VULKAN_HPP_NOEXCEPT = default;

    VULKAN_HPP_CONSTEXPR_14 Flags<BitType> & operator|=( Flags<BitType> const & rhs ) VULKAN_HPP_NOEXCEPT
    {
      m_mask |= rhs.m_mask;
      return *this;
    }

    VULKAN_HPP_CONSTEXPR_14 Flags<BitType> & operator&=( Flags<BitType> const & rhs ) VULKAN_HPP_NOEXCEPT
    {
      m_mask &= rhs.m_mask;
      return *this;
    }

    VULKAN_HPP_CONSTEXPR_14 Flags<BitType> & operator^=( Flags<BitType> const & rhs ) VULKAN_HPP_NOEXCEPT
    {
      m_mask ^= rhs.m_mask;
      return *this;
    }

    // cast operators
    explicit VULKAN_HPP_CONSTEXPR operator bool() const VULKAN_HPP_NOEXCEPT
    {
      return !!m_mask;
    }

    explicit VULKAN_HPP_CONSTEXPR operator MaskType() const VULKAN_HPP_NOEXCEPT
    {
      return m_mask;
    }

#if defined( VULKAN_HPP_FLAGS_MASK_TYPE_AS_PUBLIC )
  public:
#else
  private:
#endif
    MaskType m_mask;
  };

#if !defined( VULKAN_HPP_HAS_SPACESHIP_OPERATOR )
  // relational operators only needed for pre C++20
  template <typename BitType>
  VULKAN_HPP_CONSTEXPR bool operator<( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator>( bit );
  }

  template <typename BitType>
  VULKAN_HPP_CONSTEXPR bool operator<=( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator>=( bit );
  }

  template <typename BitType>
  VULKAN_HPP_CONSTEXPR bool operator>( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator<( bit );
  }

  template <typename BitType>
  VULKAN_HPP_CONSTEXPR bool operator>=( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator<=( bit );
  }

  template <typename BitType>
  VULKAN_HPP_CONSTEXPR bool operator==( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator==( bit );
  }

  template <typename BitType>
  VULKAN_HPP_CONSTEXPR bool operator!=( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator!=( bit );
  }
#endif

  // bitwise operators
  template <typename BitType>
  VULKAN_HPP_CONSTEXPR Flags<BitType> operator&( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator&( bit );
  }

  template <typename BitType>
  VULKAN_HPP_CONSTEXPR Flags<BitType> operator|( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator|( bit );
  }

  template <typename BitType>
  VULKAN_HPP_CONSTEXPR Flags<BitType> operator^( BitType bit, Flags<BitType> const & flags ) VULKAN_HPP_NOEXCEPT
  {
    return flags.operator^( bit );
  }