DoorKeeper/include/doorkeeper/implem/basemapsource.inl

namespace dk {
	namespace implem {
		template <typename T, uint32_t D>
		class data_fetcher<T, D, true> {
		public:
			typedef typename BaseMapSource<D>::coords coords;
			static void fetch ( std::vector<T>& parOut, const coords& parFrom, const coords& parTo, std::size_t parCount, BaseMapSource<D>& parMapSrc ) {
				parOut.resize(parCount);
				parMapSrc.fetch_raw(reinterpret_cast<char*>(parOut.data()), parFrom, parTo, sizeof(T) * parCount);
			}
		};
		template <typename T, uint32_t D>
		class data_fetcher<T, D, false> {
		public:
			typedef typename BaseMapSource<D>::coords coords;
			static void fetch ( std::vector<T>& parOut, const coords& parFrom, const coords& parTo, std::size_t parCount, BaseMapSource<D>& parMapSrc ) {
				parOut.reserve(parCount);
				DK_ASSERT(false); //not implemented
				(void)parOut;
				(void)parFrom;
				(void)parTo;
				(void)parMapSrc;
			}
		};
	} //namespace implem

	template <uint32_t D>
	template <typename T>
	void BaseMapSource<D>::fetch (std::vector<T>& parOut, const coords& parFrom, const coords& parTo) {
		const auto tile_count = tile_volume<D>(parTo - parFrom + 1);
		const std::size_t casted_tile_count = static_cast<std::size_t>(tile_count);
		DK_ASSERT(static_cast<decltype(tile_count)>(casted_tile_count) == tile_count);

		parOut.reserve(casted_tile_count);
		parOut.clear();
		implem::data_fetcher<T, D>::fetch(parOut, parFrom, parTo, casted_tile_count, *this);
	}
} //namespace dk