Vulkan-Hpp/snippets/ResultValue.hpp

  template <typename T> void ignore(T const &) VULKAN_HPP_NOEXCEPT {}

  template <typename T>
  struct ResultValue
  {
#ifdef VULKAN_HPP_HAS_NOEXCEPT
    ResultValue( Result r, T & v ) VULKAN_HPP_NOEXCEPT(VULKAN_HPP_NOEXCEPT(T(v)))
#else
    ResultValue( Result r, T & v )
#endif
      : result( r )
      , value( v )
    {}

#ifdef VULKAN_HPP_HAS_NOEXCEPT
    ResultValue( Result r, T && v ) VULKAN_HPP_NOEXCEPT(VULKAN_HPP_NOEXCEPT(T(std::move(v))))
#else
    ResultValue( Result r, T && v )
#endif
      : result( r )
      , value( std::move( v ) )
    {}

    Result  result;
    T       value;

    operator std::tuple<Result&, T&>() VULKAN_HPP_NOEXCEPT { return std::tuple<Result&, T&>(result, value); }
  };

#if !defined( VULKAN_HPP_NO_SMART_HANDLE )
  template <typename Type, typename Dispatch>
  struct ResultValue<UniqueHandle<Type, Dispatch>>
  {
#ifdef VULKAN_HPP_HAS_NOEXCEPT
    ResultValue(Result r, UniqueHandle<Type, Dispatch> && v) VULKAN_HPP_NOEXCEPT
#else
    ResultValue(Result r, UniqueHandle<Type, Dispatch> && v)
#endif
      : result(r)
      , value(std::move(v))
    {}

    std::tuple<Result, UniqueHandle<Type, Dispatch>> asTuple()
    {
      return std::make_tuple( result, std::move( value ) );
    }

    Result                        result;
    UniqueHandle<Type, Dispatch>  value;
  };

  template <typename Type, typename Dispatch>
  struct ResultValue<std::vector<UniqueHandle<Type, Dispatch>>>
  {
#  ifdef VULKAN_HPP_HAS_NOEXCEPT
    ResultValue( Result r, std::vector<UniqueHandle<Type, Dispatch>> && v ) VULKAN_HPP_NOEXCEPT
#  else
    ResultValue( Result r, std::vector<UniqueHandle<Type, Dispatch>> && v )
#  endif
      : result( r )
      , value( std::move( v ) )
    {}

    std::tuple<Result, std::vector<UniqueHandle<Type, Dispatch>>> asTuple()
    {
      return std::make_tuple( result, std::move( value ) );
    }

    Result                                    result;
    std::vector<UniqueHandle<Type, Dispatch>> value;
  };
#endif

  template <typename T>
  struct ResultValueType
  {
#ifdef VULKAN_HPP_NO_EXCEPTIONS
    typedef ResultValue<T>  type;
#else
    typedef T               type;
#endif
  };

  template <>
  struct ResultValueType<void>
  {
#ifdef VULKAN_HPP_NO_EXCEPTIONS
    typedef Result type;
#else
    typedef void   type;
#endif
  };

  VULKAN_HPP_INLINE typename ResultValueType<void>::type createResultValueType( Result result )
  {
#ifdef VULKAN_HPP_NO_EXCEPTIONS
    return result;
#else
    ignore( result );
#endif
  }

  template <typename T>
  VULKAN_HPP_INLINE typename ResultValueType<T>::type createResultValueType( Result result, T & data )
  {
#ifdef VULKAN_HPP_NO_EXCEPTIONS
    return ResultValue<T>( result, data );
#else
    ignore( result );
    return data;
#endif
  }

  template <typename T>
  VULKAN_HPP_INLINE typename ResultValueType<T>::type createResultValueType( Result result, T && data )
  {
#ifdef VULKAN_HPP_NO_EXCEPTIONS
    return ResultValue<T>( result, std::move( data ) );
#else
    ignore( result );
    return std::move( data );
#endif
  }