DoorKeeper/include/doorkeeper/mapreaders/mapstreamraw.hpp

#ifndef id56E2396E102B4E10B20466D6B57A4C66
#define id56E2396E102B4E10B20466D6B57A4C66

#include "doorkeeper/mapreaders/mapstreambase.hpp"
#include "doorkeeper/implem/helpers.hpp"
#include <cstddef>
#include <algorithm>
#include <type_traits>
#include <istream>

namespace dk {
	namespace implem {
		template <typename T>
		class HasMapDimensions {
			class yes { char m; };
			class nope { yes m[2]; };
			static yes deduce ( int a, int b = T::MapDimensions );
			static nope deduce ( ... );
		public:
			enum {
				result = (sizeof(yes) == sizeof(deduce(1)))
			};
		};

		template <std::size_t D, typename Device>
		typename std::enable_if<Device::MapDimensions == D, std::size_t>::type err_mismatching_dimension ( const Device* ) noexcept a_pure;

		template <std::size_t D, typename Device>
		typename std::enable_if<HasMapDimensions<Device>::result == false, std::size_t>::type err_mismatching_dimension ( const Device* ) noexcept a_pure;

		template <std::size_t D, typename Device>
		typename std::enable_if<Device::MapDimensions == D, Vector<CoordinateScalarType, D>>::type retrieve_map_size_from_device ( Device* parDevice );

		template <std::size_t D, typename Device>
		typename std::enable_if<HasMapDimensions<Device>::result == false, Vector<CoordinateScalarType, D>>::type retrieve_map_size_from_device ( Device* parDevice );
	} //namespace implem

	//Customization point - specialize to enable map size retrieval for Device
	template <std::size_t D, typename Device>
	typename Device::coords get_map_size_from_device ( const Device* parDevice );

	template <typename T, std::size_t D>
	class MapStreamRaw : public MapStreamBase<D> {
	public:
		typedef typename MapStreamBase<D>::coords coords;

		MapStreamRaw ( void ) = delete;
		template <typename Device>
		explicit MapStreamRaw ( Device& parDevice );
		virtual ~MapStreamRaw ( void ) noexcept = default;

		virtual bool isReadable ( void ) const { return true; }
		virtual bool isWriteable ( void ) const { return false; }

	private:
		virtual std::size_t dataBlockRequested ( char* parOut, std::size_t parOutSize, const coords& parFrom, const coords& parTo );

		std::istream m_istream;
		const bool m_deviceHasDim;
	};
} //namespace dk

#include "doorkeeper/implem/mapstreamraw.inl"

#endif