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71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
/*
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* Copyright (c) 2013, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_ON_H
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#define SQLPP_ON_H
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#include <ostream>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/detail/serialize_tuple.h>
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#include <sqlpp11/detail/serializable_list.h>
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namespace sqlpp
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{
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template<typename Database, typename... Expr>
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struct on_t
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{
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using _is_on = std::true_type;
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using _is_dynamic = typename std::conditional<std::is_same<Database, void>::value, std::false_type, std::true_type>::type;
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static_assert(_is_dynamic::value or sizeof...(Expr), "at least one expression argument required in on()");
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using _valid_expressions = typename detail::make_set_if<is_expression_t, Expr...>::type;
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static_assert(_valid_expressions::size::value == sizeof...(Expr), "at least one argument is not an expression in on()");
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template<typename E>
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void add(E&& expr)
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{
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static_assert(is_expression_t<typename std::decay<E>::type>::value, "invalid expression argument in add_on()");
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_dynamic_expressions.emplace_back(std::forward<E>(expr));
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}
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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{
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if (sizeof...(Expr) == 0 and _dynamic_expressions.empty())
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return;
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os << " ON ";
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detail::serialize_tuple(os, db, _expressions, " AND ");
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_dynamic_expressions.serialize(os, db, " AND ", sizeof...(Expr) == 0);
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}
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std::tuple<Expr...> _expressions;
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detail::serializable_list<Database> _dynamic_expressions;
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};
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}
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#endif
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