sqlpp11/include/sqlpp11/result.h

/*
 * Copyright (c) 2013-2014, Roland Bock
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 *   Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * 
 *   Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef SQLPP_RESULT_H
#define SQLPP_RESULT_H

// FIXME: include for move?
namespace sqlpp
{
	template<typename DbResult, typename ResultRow>
		class result_t
		{
			using db_result_t = DbResult;
			using result_row_t = ResultRow;

			db_result_t _result;
			result_row_t _result_row;
			db_result_t _end;
			result_row_t _end_row;

		public:
			result_t() = default;

			template<typename DynamicNames>
				result_t(db_result_t&& result, const DynamicNames& dynamic_names):
					_result(std::move(result)),
					_result_row(dynamic_names)
			{
				_result.next(_result_row);
			}

			result_t(const result_t&) = delete;
			result_t(result_t&&) = default;
			result_t& operator=(const result_t&) = delete;
			result_t& operator=(result_t&&) = default;

			// Iterator
			class iterator
			{
			public:
				iterator(db_result_t& result, result_row_t& result_row):
					_result(result),
					_result_row(result_row)
				{
				}

				const result_row_t& operator*() const
				{
					return _result_row;
				}

				const result_row_t* operator->() const
				{
					return &_result_row;
				}

				bool operator==(const iterator& rhs) const
				{
					return _result_row == rhs._result_row;
				}

				bool operator!=(const iterator& rhs) const
				{
					return not (operator==(rhs));
				}

				void operator++()
				{
					_result.next(_result_row);
				}

				db_result_t& _result;
				result_row_t& _result_row;
			};

			iterator begin()
			{
				return iterator(_result, _result_row);
			}

			iterator end()
			{
				return iterator(_end, _end_row);
			}

			const result_row_t& front() const
			{
				return _result_row;
			}

			bool empty() const
			{
				return _result_row == _end_row;
			}

			void pop_front()
			{
				_result.next(_result_row);
			}

		};
}

#endif