Vulkan-Hpp/snippets/UniqueHandle.hpp

#if !defined( VULKAN_HPP_NO_SMART_HANDLE )
  template <typename Type, typename Dispatch>
  class UniqueHandleTraits;

  template <typename Type, typename Dispatch>
  class UniqueHandle : public UniqueHandleTraits<Type, Dispatch>::deleter
  {
  private:
    using Deleter = typename UniqueHandleTraits<Type, Dispatch>::deleter;

  public:
    using element_type = Type;

    UniqueHandle()
      : Deleter()
      , m_value()
    {}

    explicit UniqueHandle( Type const & value, Deleter const & deleter = Deleter() ) VULKAN_HPP_NOEXCEPT
      : Deleter( deleter )
      , m_value( value )
    {}

    UniqueHandle( UniqueHandle const & ) = delete;

    UniqueHandle( UniqueHandle && other ) VULKAN_HPP_NOEXCEPT
      : Deleter( std::move( static_cast<Deleter &>( other ) ) )
      , m_value( other.release() )
    {}

    ~UniqueHandle() VULKAN_HPP_NOEXCEPT
    {
      if ( m_value )
      {
        this->destroy( m_value );
      }
    }

    UniqueHandle & operator=( UniqueHandle const & ) = delete;

    UniqueHandle & operator=( UniqueHandle && other ) VULKAN_HPP_NOEXCEPT
    {
      reset( other.release() );
      *static_cast<Deleter *>( this ) = std::move( static_cast<Deleter &>( other ) );
      return *this;
    }

    explicit operator bool() const VULKAN_HPP_NOEXCEPT
    {
      return m_value.operator bool();
    }

    Type const * operator->() const VULKAN_HPP_NOEXCEPT
    {
      return &m_value;
    }

    Type * operator->() VULKAN_HPP_NOEXCEPT
    {
      return &m_value;
    }

    Type const & operator*() const VULKAN_HPP_NOEXCEPT
    {
      return m_value;
    }

    Type & operator*() VULKAN_HPP_NOEXCEPT
    {
      return m_value;
    }

    const Type & get() const VULKAN_HPP_NOEXCEPT
    {
      return m_value;
    }

    Type & get() VULKAN_HPP_NOEXCEPT
    {
      return m_value;
    }

    void reset( Type const & value = Type() ) VULKAN_HPP_NOEXCEPT
    {
      if ( m_value != value )
      {
        if ( m_value )
        {
          this->destroy( m_value );
        }
        m_value = value;
      }
    }

    Type release() VULKAN_HPP_NOEXCEPT
    {
      Type value = m_value;
      m_value    = nullptr;
      return value;
    }

    void swap( UniqueHandle<Type, Dispatch> & rhs ) VULKAN_HPP_NOEXCEPT
    {
      std::swap( m_value, rhs.m_value );
      std::swap( static_cast<Deleter &>( *this ), static_cast<Deleter &>( rhs ) );
    }

  private:
    Type m_value;
  };

  template <typename UniqueType>
  VULKAN_HPP_INLINE std::vector<typename UniqueType::element_type>
                    uniqueToRaw( std::vector<UniqueType> const & handles )
  {
    std::vector<typename UniqueType::element_type> newBuffer( handles.size() );
    std::transform( handles.begin(), handles.end(), newBuffer.begin(), []( UniqueType const & handle ) { return handle.get(); } );
    return newBuffer;
  }

  template <typename Type, typename Dispatch>
  VULKAN_HPP_INLINE void swap( UniqueHandle<Type, Dispatch> & lhs,
                               UniqueHandle<Type, Dispatch> & rhs ) VULKAN_HPP_NOEXCEPT
  {
    lhs.swap( rhs );
  }
#endif