mirror of
https://github.com/rbock/sqlpp11.git
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132 lines
4.2 KiB
C++
132 lines
4.2 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_INTERPRETABLE_H
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#define SQLPP_INTERPRETABLE_H
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#include <memory>
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#include <sqlpp11/serializer_context.h>
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#include <sqlpp11/parameter_list.h>
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#include <sqlpp11/serialize.h>
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#include <sqlpp11/interpret.h>
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namespace sqlpp
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{
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namespace vendor
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{
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template<typename Db>
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struct interpretable_t
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{
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using _serializer_context_t = typename Db::_serializer_context_t;
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using _interpreter_context_t = typename Db::_interpreter_context_t;
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template<typename T>
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interpretable_t(T t):
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_impl(std::make_shared<_impl_t<T>>(t))
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{}
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interpretable_t(const interpretable_t&) = default;
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interpretable_t(interpretable_t&&) = default;
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interpretable_t& operator=(const interpretable_t&) = default;
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interpretable_t& operator=(interpretable_t&&) = default;
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~interpretable_t() = default;
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sqlpp::serializer_context_t& serialize(sqlpp::serializer_context_t& context) const
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{
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return _impl->serialize(context);
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}
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// This method only exists if Db::_serializer_context_t and sqlpp::serializer_context_t are not the same
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template<typename Context>
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auto serialize(Context& context) const
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-> typename std::enable_if<std::is_same<Context, _serializer_context_t>::value
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and not std::is_same<Context, sqlpp::serializer_context_t>::value, Context&>::type
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{
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return _impl->db_serialize(context);
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}
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_interpreter_context_t& interpret(_interpreter_context_t& context) const
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{
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return _impl->interpret(context);
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}
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private:
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struct _impl_base
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{
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virtual sqlpp::serializer_context_t& serialize(sqlpp::serializer_context_t& context) const = 0;
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virtual _serializer_context_t& db_serialize(_serializer_context_t& context) const = 0;
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virtual _interpreter_context_t& interpret(_interpreter_context_t& context) const = 0;
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};
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template<typename T>
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struct _impl_t: public _impl_base
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{
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static_assert(not make_parameter_list_t<T>::type::size::value, "parameters not supported in dynamic statement parts");
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_impl_t(T t):
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_t(t)
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{}
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sqlpp::serializer_context_t& serialize(sqlpp::serializer_context_t& context) const
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{
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sqlpp::serialize(_t, context);
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return context;
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}
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_serializer_context_t& db_serialize(_serializer_context_t& context) const
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{
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Db::_serialize_interpretable(_t, context);
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return context;
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}
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_interpreter_context_t& interpret(_interpreter_context_t& context) const
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{
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Db::_interpret_interpretable(_t, context);
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return context;
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}
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T _t;
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};
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std::shared_ptr<const _impl_base> _impl;
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};
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template<typename Context, typename Database>
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struct serializer_t<Context, interpretable_t<Database>>
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{
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using T = interpretable_t<Database>;
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static Context& _(const T& t, Context& context)
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{
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t.serialize(context);
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return context;
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}
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};
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}
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}
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#endif
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