/*
 * 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_EXISTS_H
#define SQLPP_EXISTS_H

#include <sqlpp11/boolean.h>

namespace sqlpp
{
	template<typename Select>
		struct exists_t: 
			public expression_operators<exists_t<Select>, boolean>,
			public alias_operators<exists_t<Select>>
	{
		using _traits = make_traits<boolean, tag::is_expression, tag::is_selectable>;
		using _recursive_traits = make_recursive_traits<Select>;

		static_assert(is_select_t<Select>::value, "exists() requires a select expression as argument");

		struct _name_t
		{
			static constexpr const char* _get_name() { return "EXISTS"; }
			template<typename T>
				struct _member_t
				{
					T exists;
					T& operator()() { return exists; }
					const T& operator()() const { return exists; }
				};
		};

		exists_t(Select select):
			_select(select)
		{}

		exists_t(const exists_t&) = default;
		exists_t(exists_t&&) = default;
		exists_t& operator=(const exists_t&) = default;
		exists_t& operator=(exists_t&&) = default;
		~exists_t() = default;

		Select _select;
	};

	template<typename Context, typename Select>
		struct serializer_t<Context, exists_t<Select>>
		{
			using _serialize_check = serialize_check_of<Context, Select>;
			using T = exists_t<Select>;

			static Context& _(const T& t, Context& context)
			{
				context << "EXISTS(";
				serialize(t._select, context);
				context << ")";
				return context;
			}
		};


	template<typename T>
		auto exists(T t) -> exists_t<wrap_operand_t<T>>
		{
			static_assert(is_select_t<wrap_operand_t<T>>::value, "exists() requires a select expression as argument");
			return { t };
		}

}

#endif