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9c75c7b873
The code is much easier to read, the optimizer should take care of pretty much everything, AND it copiles even faster without the code being riddled with std::forward and std::decay
91 lines
3.8 KiB
C++
91 lines
3.8 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_UPDATE_LIST_H
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#define SQLPP_UPDATE_LIST_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/detail/set.h>
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#include <sqlpp11/vendor/interpret_tuple.h>
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#include <sqlpp11/vendor/interpretable_list.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 Database, typename... Assignments>
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struct update_list_t
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{
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using _is_update_list = 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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using _parameter_tuple_t = std::tuple<Assignments...>;
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// check for at least one order expression
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static_assert(_is_dynamic::value or sizeof...(Assignments), "at least one assignment expression required in set()");
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// check for duplicate assignments
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static_assert(not ::sqlpp::detail::has_duplicates<Assignments...>::value, "at least one duplicate argument detected in set()");
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// check for invalid assignments
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using _assignment_set = typename ::sqlpp::detail::make_set_if<is_assignment_t, Assignments...>::type;
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static_assert(_assignment_set::size::value == sizeof...(Assignments), "at least one argument is not an assignment in set()");
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// check for prohibited assignments
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using _prohibited_assignment_set = typename ::sqlpp::detail::make_set_if<must_not_update_t, typename Assignments::_column_t...>::type;
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static_assert(_prohibited_assignment_set::size::value == 0, "at least one assignment is prohibited by its column definition in set()");
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template<typename Assignment>
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void add(Assignment assignment)
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{
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static_assert(is_assignment_t<Assignment>::value, "set() arguments require to be assigments");
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static_assert(not must_not_update_t<typename Assignment::_column_t>::value, "set() argument must not be updated");
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_dynamic_assignments.emplace_back(assignment);
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}
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_parameter_tuple_t _assignments;
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typename vendor::interpretable_list_t<Database> _dynamic_assignments;
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};
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template<typename Context, typename Database, typename... Assignments>
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struct interpreter_t<Context, update_list_t<Database, Assignments...>>
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{
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using T = update_list_t<Database, Assignments...>;
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static Context& _(const T& t, Context& context)
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{
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context << " SET ";
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interpret_tuple(t._assignments, ",", context);
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if (sizeof...(Assignments) and not t._dynamic_assignments.empty())
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context << ',';
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interpret_list(t._dynamic_assignments, ',', 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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