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102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
#pragma once
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/*
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* Copyright (c) 2013-2015, 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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#include <memory>
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#include <sqlpp11/parameter_list.h>
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#include <sqlpp11/serialize.h>
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namespace sqlpp
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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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template <typename T>
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interpretable_t(T t) : _requires_parens(requires_parens_t<T>::value), _impl(std::make_shared<_impl_t<T>>(t))
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{
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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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_serializer_context_t& interpret(_serializer_context_t& context) const
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{
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return _impl->interpret(context);
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}
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bool _requires_parens;
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private:
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struct _impl_base
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{
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virtual ~_impl_base() = default;
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virtual _serializer_context_t& interpret(_serializer_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>::size::value, "parameters not supported in dynamic statement parts");
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_impl_t(T t) : _t(t)
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{
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}
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_serializer_context_t& interpret(_serializer_context_t& context) const
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{
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serialize(_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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Context& serialize(const interpretable_t<Database>& t, Context& context)
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{
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if (t._requires_parens)
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{
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context << '(';
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t.interpret(context);
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context << ')';
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}
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else
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{
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t.interpret(context);
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}
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return context;
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}
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} // namespace sqlpp
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