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79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
/*
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* Copyright (c) 2013-2014, 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 <sqlpp11/type_traits.h>
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#include <sqlpp11/interpret_tuple.h>
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#include <sqlpp11/interpretable_list.h>
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#include <sqlpp11/detail/logic.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 _traits = make_traits<no_value_t, tag::is_on>;
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using _recursive_traits = make_recursive_traits<Expr...>;
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using _is_dynamic = is_database<Database>;
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static_assert(_is_dynamic::value or sizeof...(Expr), "at least one expression argument required 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<E>::value, "invalid expression argument in add_on()");
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_dynamic_expressions.emplace_back(expr);
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}
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std::tuple<Expr...> _expressions;
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interpretable_list_t<Database> _dynamic_expressions;
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};
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template<typename Context, typename Database, typename... Expr>
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struct serializer_t<Context, on_t<Database, Expr...>>
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{
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using T = on_t<Database, Expr...>;
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static Context& _(const T& t, Context& context)
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{
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if (sizeof...(Expr) == 0 and t._dynamic_expressions.empty())
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return context;
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context << " ON ";
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interpret_tuple(t._expressions, " AND ", context);
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if (sizeof...(Expr) and not t._dynamic_expressions.empty())
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context << " AND ";
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interpret_list(t._dynamic_expressions, " AND ", context);
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return context;
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}
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};
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}
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#endif
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