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112 lines
3.0 KiB
C++
112 lines
3.0 KiB
C++
/*
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* Copyright (c) 2013-2016, 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_SELECT_COLUMN_LIST_FWD_H
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#define SQLPP_SELECT_COLUMN_LIST_FWD_H
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#include <vector>
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#include <string>
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#include <sqlpp11/no_name.h>
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#include <sqlpp11/named_interpretable.h>
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namespace sqlpp
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{
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template <typename Db>
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struct dynamic_select_column_list
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{
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using _names_t = std::vector<std::string>;
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std::vector<named_interpretable_t<Db>> _dynamic_columns;
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_names_t _dynamic_expression_names;
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template <typename Expr>
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void emplace_back(Expr expr)
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{
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_dynamic_expression_names.push_back(name_of<Expr>::char_ptr());
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_dynamic_columns.emplace_back(expr);
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}
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bool empty() const
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{
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return _dynamic_columns.empty();
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}
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auto size() -> size_t
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{
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return _dynamic_columns.size();
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}
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};
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template <>
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struct dynamic_select_column_list<void>
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{
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using _names_t = no_name_t;
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_names_t _dynamic_expression_names;
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static constexpr bool empty()
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{
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return true;
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}
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static constexpr auto size() -> size_t
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{
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return {};
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}
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};
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template <typename Context, typename Db>
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struct serializer_t<Context, dynamic_select_column_list<Db>>
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{
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using T = dynamic_select_column_list<Db>;
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static Context& _(const T& t, Context& context)
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{
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bool first = true;
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for (const auto column : t._dynamic_columns)
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{
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if (first)
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first = false;
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else
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context << ',';
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serialize(column, context);
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}
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return context;
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}
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};
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template <typename Context>
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struct serializer_t<Context, dynamic_select_column_list<void>>
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{
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using T = dynamic_select_column_list<void>;
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static Context& _(const T&, Context& context)
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{
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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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