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75 lines
2.9 KiB
C++
75 lines
2.9 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_POLICY_UPDATE_H
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#define SQLPP_POLICY_UPDATE_H
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#include <sqlpp11/wrong.h>
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#include <sqlpp11/bad_statement.h>
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namespace sqlpp
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{
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template<typename Needle, typename Replacement>
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struct policy_update_impl
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{
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template<typename T>
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using _policy_t = typename std::conditional<std::is_same<Needle, T>::value, Replacement, T>::type;
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};
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template<typename T, typename Needle, typename Replacement>
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using policy_update_t = typename policy_update_impl<Needle, Replacement>::template _policy_t<T>;
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template<typename Original, typename Needle, typename Replacement>
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struct update_policies_impl
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{
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using type = typename Original::template _policy_update_t<Needle, Replacement>;
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};
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template<typename Original, typename Needle, typename Replacement>
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using update_policies_t = typename update_policies_impl<Original, Needle, Replacement>::type;
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template<typename Policies, typename Needle, typename Replacement>
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using new_statement = typename Policies::template _new_statement_t<Needle, Replacement>;
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template<bool, typename Policies, typename Needle, typename Replacement>
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struct new_statement_impl
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{
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using type = typename Policies::template _new_statement_t<Needle, Replacement>;
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};
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template<typename Policies, typename Needle, typename Replacement>
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struct new_statement_impl<false, Policies, Needle, Replacement>
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{
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using type = bad_statement;
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};
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template<bool Check, typename Policies, typename Needle, typename Replacement>
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using new_statement_t = typename new_statement_impl<Check, Policies, Needle, Replacement>::type;
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}
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#endif
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