sqlpp11/tests/FunctionTest.cpp

/*
 * Copyright (c) 2013-2015, 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.
 */

#include "Sample.h"
#include "MockDb.h"
#include <sqlpp11/alias_provider.h>
#include <sqlpp11/select.h>
#include <sqlpp11/functions.h>
#include <sqlpp11/connection.h>

#include <iostream>

SQLPP_ALIAS_PROVIDER(kaesekuchen)

int main()
{
	MockDb db = {};
	test::TabFoo f; 
	test::TabBar t;

	//f.omega + 4 *= "";

	// MEMBER FUNCTIONS
	// ----------------
	
	// Test in
	{
		using TI = decltype(t.alpha.in(1, 2, 3));
		using TF = decltype(f.omega.in(1.0, 2.0, 3.0));
		using TT = decltype(t.beta.in("a", "b", "c"));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test in with value list
	{
		using TI = decltype(t.alpha.in(sqlpp::value_list(std::vector<int>({1, 2, 3}))));
		using TF = decltype(f.omega.in(sqlpp::value_list(std::vector<float>({1.0, 2.0, 3.0}))));
		using TT = decltype(t.beta.in(sqlpp::value_list(std::vector<std::string>({"a", "b", "c"}))));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test not_in
	{
		using TI = decltype(t.alpha.not_in(1, 2, 3));
		using TF = decltype(f.omega.not_in(1.0, 2.0, 3.0));
		using TT = decltype(t.beta.not_in("a", "b", "c"));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test not in with value list
	{
		using TI = decltype(t.alpha.not_in(sqlpp::value_list(std::vector<int>({1, 2, 3}))));
		using TF = decltype(f.omega.not_in(sqlpp::value_list(std::vector<float>({1.0, 2.0, 3.0}))));
		using TT = decltype(t.beta.not_in(sqlpp::value_list(std::vector<std::string>({"a", "b", "c"}))));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test like
	{
		using TT = decltype(t.beta.like("%c%"));
		static_assert(sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test is_null
	{
		using TI = decltype(t.alpha.is_null());
		using TF = decltype(f.omega.is_null());
		using TT = decltype(t.beta.is_null());
		using TTI = decltype(is_null(t.alpha));
		using TTF = decltype(is_null(f.omega));
		using TTT = decltype(is_null(t.beta));
		static_assert(std::is_same<TI, TTI>::value, "type requirement");
		static_assert(std::is_same<TF, TTF>::value, "type requirement");
		static_assert(std::is_same<TT, TTT>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test is_not_null
	{
		using TI = decltype(t.alpha.is_not_null());
		using TF = decltype(f.omega.is_not_null());
		using TT = decltype(t.beta.is_not_null());
		using TTI = decltype(is_not_null(t.alpha));
		using TTF = decltype(is_not_null(f.omega));
		using TTT = decltype(is_not_null(t.beta));
		static_assert(std::is_same<TI, TTI>::value, "type requirement");
		static_assert(std::is_same<TF, TTF>::value, "type requirement");
		static_assert(std::is_same<TT, TTT>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// SUB_SELECT_FUNCTIONS
	// --------------------
	
	// Test exists
	{
		using TI = decltype(exists(select(t.alpha).from(t)));
		using TT = decltype(exists(select(t.beta).from(t)));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TT>::value, "type requirement");

		if (db(select(exists(select(t.alpha).from(t).where(true)))).front().exists) { /* do something */ }
	}


	// Test any
	{
		using S = decltype(select(t.alpha).from(t));
		static_assert(sqlpp::is_numeric_t<S>::value, "type requirement");
		
		using TI = decltype(any(select(t.alpha).from(t)));
		using TT = decltype(any(select(t.beta).from(t)));
		using TF = decltype(any(select(f.omega).from(f)));
		static_assert(not sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_multi_expression_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_multi_expression_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TF>::value, "tFpe requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_multi_expression_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_integral_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_floating_point_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test some
	{
		using TI = decltype(some(select(t.alpha).from(t)));
		using TT = decltype(some(select(t.beta).from(t)));
		using TF = decltype(some(select(f.omega).from(f)));
		static_assert(not sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_multi_expression_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_multi_expression_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_text_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_multi_expression_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_integral_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_floating_point_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// NUMERIC FUNCTIONS
  // -----------------

	// Test avg
	{
		using TI = decltype(avg(t.alpha));
		using TF = decltype(avg(f.omega));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_integral_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
	}

	// Test count
	{
		using TI = decltype(count(t.alpha));
		using TT = decltype(count(t.beta));
		using TF = decltype(count(f.omega));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_floating_point_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_floating_point_t<TT>::value, "type requirement");

		if (db(select(count(t.alpha)).from(t).where(true)).front().count) { /* do something */ }
	}

	// Test max
	{
		using TI = decltype(max(t.alpha));
		using TF = decltype(max(f.omega));
		using TT = decltype(max(t.beta));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_floating_point_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_integral_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test min
	{
		using TI = decltype(min(t.alpha));
		using TF = decltype(min(f.omega));
		using TT = decltype(min(t.beta));
		static_assert(sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_floating_point_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_integral_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(not sqlpp::is_numeric_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// Test sum
	{
		using TI = decltype(sum(t.alpha));
		using TF = decltype(sum(f.omega));
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_floating_point_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_selectable_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_numeric_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_integral_t<TF>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
	}

	// MISC FUNCTIONS
  // --------------

	// test value
	{
		using TB = decltype(sqlpp::value(true));
		using TI = decltype(sqlpp::value(7));
		using TF = decltype(sqlpp::value(1.5));
		using TT = decltype(sqlpp::value("cheesecake"));
		static_assert(not sqlpp::is_selectable_t<TB>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TB>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TB>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// test flatten
	{
		using TB = decltype(flatten(t.gamma, db));
		using TI = decltype(flatten(t.alpha, db));
		using TF = decltype(flatten(f.omega, db));
		using TT = decltype(flatten(t.beta, db));
		static_assert(not sqlpp::is_selectable_t<TB>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TB>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TB>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// test value_or_null
	{
		using TB = decltype(sqlpp::value_or_null(true));
		using TI = decltype(sqlpp::value_or_null(7));
		using TF = decltype(sqlpp::value_or_null(5.6));
		using TT = decltype(sqlpp::value_or_null("hallo"));
		using TBN = decltype(sqlpp::value_or_null<sqlpp::boolean>(sqlpp::null));
		using TIN = decltype(sqlpp::value_or_null<sqlpp::integral>(sqlpp::null));
		using TFN = decltype(sqlpp::value_or_null<sqlpp::floating_point>(sqlpp::null));
		using TTN = decltype(sqlpp::value_or_null<sqlpp::text>(sqlpp::null));
		static_assert(std::is_same<TB, TBN>::value, "type_requirement");
		static_assert(std::is_same<TI, TIN>::value, "type_requirement");
		static_assert(std::is_same<TF, TFN>::value, "type_requirement");
		static_assert(std::is_same<TT, TTN>::value, "type_requirement");
		static_assert(not sqlpp::is_selectable_t<TB>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TB>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TB>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// test verbatim
	{
		using TB = decltype(sqlpp::verbatim<sqlpp::boolean>("1"));
		using TI = decltype(sqlpp::verbatim<sqlpp::bigint>("42"));
		using TF = decltype(sqlpp::verbatim<sqlpp::floating_point>("1.5"));
		using TT = decltype(sqlpp::verbatim<sqlpp::text>("cheesecake"));
		static_assert(not sqlpp::is_selectable_t<TB>::value, "type requirement");
		static_assert(sqlpp::is_boolean_t<TB>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TB>::value, "type requirement");
		static_assert(sqlpp::is_integral_t<TI>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TI>::value, "type requirement");
		static_assert(sqlpp::is_floating_point_t<TF>::value, "type requirement");
		static_assert(not sqlpp::is_selectable_t<TT>::value, "type requirement");
		static_assert(sqlpp::is_text_t<TT>::value, "type requirement");
	}

	// test verbatim_table
	{
		using T = decltype(sqlpp::verbatim_table("cheesecake"));
		static_assert(not sqlpp::is_selectable_t<T>::value, "type requirement");
		static_assert(not sqlpp::is_expression_t<T>::value, "type requirement");
		static_assert(sqlpp::is_table_t<T>::value, "type requirement");
	}

	// test verbatim_table alias
	{
		using T = decltype(sqlpp::verbatim_table("cheesecake").as(kaesekuchen));
		static_assert(not sqlpp::is_selectable_t<T>::value, "type requirement");
		static_assert(not sqlpp::is_expression_t<T>::value, "type requirement");
		static_assert(sqlpp::is_table_t<T>::value, "type requirement");
		static_assert(sqlpp::is_alias_t<T>::value, "type requirement");
	}

	// test tvin
	{
		static_assert(std::is_same<decltype(sqlpp::tvin(1)), sqlpp::tvin_arg_t<sqlpp::integral_operand>>::value, "integral values are accepted and wrapped") ;
		static_assert(std::is_same<decltype(sqlpp::tvin(false)), sqlpp::tvin_arg_t<sqlpp::boolean_operand>>::value, "bool values are accepted and wrapped") ;
		static_assert(std::is_same<decltype(sqlpp::tvin(0.17)), sqlpp::tvin_arg_t<sqlpp::floating_point_operand>>::value, "float values are accepted and wrapped") ;
		static_assert(std::is_same<decltype(sqlpp::tvin("test")), sqlpp::tvin_arg_t<sqlpp::text_operand>>::value, "text values are accepted and wrapped") ;

		for (const auto& row : db(select(all_of(t)).from(t).where(true)))
		{
			static_assert(std::is_same<decltype(sqlpp::tvin(row.alpha)), sqlpp::tvin_arg_t<decltype(row.alpha)>>::value, "result fields are accepted and not wrapped") ;
			static_assert(std::is_same<decltype(sqlpp::tvin(row.beta)), sqlpp::tvin_arg_t<decltype(row.beta)>>::value, "result fields are accepted and not wrapped") ;
			static_assert(std::is_same<decltype(sqlpp::tvin(row.gamma)), sqlpp::tvin_arg_t<decltype(row.gamma)>>::value, "result fields are accepted and not wrapped") ;
		}
	}

	return 0;
}