Vulkan-Hpp/snippets/ArrayProxy.hpp

  template <typename T>
  class ArrayProxy
  {
  public:
    VULKAN_HPP_CONSTEXPR ArrayProxy() VULKAN_HPP_NOEXCEPT
      : m_count( 0 )
      , m_ptr( nullptr )
    {}

    VULKAN_HPP_CONSTEXPR ArrayProxy( std::nullptr_t ) VULKAN_HPP_NOEXCEPT
      : m_count( 0 )
      , m_ptr( nullptr )
    {}

    ArrayProxy( T const & value ) VULKAN_HPP_NOEXCEPT
      : m_count( 1 )
      , m_ptr( &value )
    {}

    ArrayProxy( uint32_t count, T const * ptr ) VULKAN_HPP_NOEXCEPT
      : m_count( count )
      , m_ptr( ptr )
    {}

    template <std::size_t C>
    ArrayProxy( T const ( &ptr )[C] ) VULKAN_HPP_NOEXCEPT
      : m_count( C )
      , m_ptr( ptr )
    {}

#  if __GNUC__ >= 9
#    pragma GCC diagnostic push
#    pragma GCC diagnostic ignored "-Winit-list-lifetime"
#  endif

    ArrayProxy( std::initializer_list<T> const & list ) VULKAN_HPP_NOEXCEPT
      : m_count( static_cast<uint32_t>( list.size() ) )
      , m_ptr( list.begin() )
    {}

    template <typename B = T, typename std::enable_if<std::is_const<B>::value, int>::type = 0>
    ArrayProxy( std::initializer_list<typename std::remove_const<T>::type> const & list ) VULKAN_HPP_NOEXCEPT
      : m_count( static_cast<uint32_t>( list.size() ) )
      , m_ptr( list.begin() )
    {
    }

#if __GNUC__ >= 9
#    pragma GCC diagnostic pop
#  endif

    // Any type with a .data() return type implicitly convertible to T*, and a .size() return type implicitly
    // convertible to size_t. The const version can capture temporaries, with lifetime ending at end of statement.
    template <typename V,
              typename std::enable_if<
                std::is_convertible<decltype( std::declval<V>().data() ), T *>::value &&
                std::is_convertible<decltype( std::declval<V>().size() ), std::size_t>::value>::type * = nullptr>
    ArrayProxy( V const & v ) VULKAN_HPP_NOEXCEPT
      : m_count( static_cast<uint32_t>( v.size() ) )
      , m_ptr( v.data() )
    {}

    const T * begin() const VULKAN_HPP_NOEXCEPT
    {
      return m_ptr;
    }

    const T * end() const VULKAN_HPP_NOEXCEPT
    {
      return m_ptr + m_count;
    }

    const T & front() const VULKAN_HPP_NOEXCEPT
    {
      VULKAN_HPP_ASSERT( m_count && m_ptr );
      return *m_ptr;
    }

    const T & back() const VULKAN_HPP_NOEXCEPT
    {
      VULKAN_HPP_ASSERT( m_count && m_ptr );
      return *( m_ptr + m_count - 1 );
    }

    bool empty() const VULKAN_HPP_NOEXCEPT
    {
      return ( m_count == 0 );
    }

    uint32_t size() const VULKAN_HPP_NOEXCEPT
    {
      return m_count;
    }

    T const * data() const VULKAN_HPP_NOEXCEPT
    {
      return m_ptr;
    }

  private:
    uint32_t  m_count;
    T const * m_ptr;
  };