sqlpp11/include/sqlpp11/noop.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_NOOP_H
#define SQLPP_NOOP_H

#include <type_traits>
#include <sqlpp11/no_value.h>
#include <sqlpp11/serializer.h>
#include <sqlpp11/prepared_execute.h>

namespace sqlpp
{
	struct noop 
	{
		using _traits = make_traits<no_value_t, tag::is_noop>;
		using _recursive_traits = make_recursive_traits<>;

		struct _alias_t {};

		template<typename Statement>
			struct _result_methods_t
			{
				using _statement_t = Statement;

				const _statement_t& _get_statement() const
				{
					return static_cast<const _statement_t&>(*this);
				}

				// Execute
				template<typename Db, typename Composite>
					auto _run(Db& db, const Composite& composite) const	-> void
					{
						return db.execute(composite);
					}

				template<typename Db>
					auto _run(Db& db) const -> void
					{
						return db.execute(_get_statement());
					}

				// Prepare
				template<typename Db, typename Composite>
					auto _prepare(Db& db, const Composite& composite) const
					-> prepared_execute_t<Db, Composite>
					{
						return {{}, db.prepare_execute(composite)};
					}

				template<typename Db>
					auto _prepare(Db& db) const
					-> prepared_execute_t<Db, _statement_t>
					{
						return {{}, db.prepare_execute(_get_statement())};
					}
			};
	};

	template<typename Context>
		struct serializer_t<Context, noop>
		{
			using _serialize_check = consistent_t;
			using T = noop;

			static Context& _(const T& t, Context& context)
			{
				return context;
			}
		};

	template<typename T>
		struct is_noop: std::is_same<T, noop> {};

}
#endif