mirror of
https://github.com/rbock/sqlpp11.git
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120 lines
4.2 KiB
C++
120 lines
4.2 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_RESULT_ROW_H
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#define SQLPP_RESULT_ROW_H
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#include <sqlpp11/raw_result_row.h>
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#include <sqlpp11/multi_column.h>
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#include <iostream>
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namespace sqlpp
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{
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namespace detail
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{
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template<size_t level, size_t index, typename... NamedExpr>
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struct result_row_impl;
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template<size_t level, size_t index, typename NamedExpr, typename... Rest>
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struct result_row_impl<level, index, NamedExpr, Rest...>:
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public NamedExpr::template _member_t<typename NamedExpr::_value_type::template _result_entry_t<index>>,
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public result_row_impl<level, index + 1, Rest...>
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{
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using _field = typename NamedExpr::template _member_t<typename NamedExpr::_value_type::template _result_entry_t<index>>;
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using _rest = result_row_impl<level, index + 1, Rest...>;
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result_row_impl(const raw_result_row_t& raw_result_row):
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_field({raw_result_row}),
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_rest(raw_result_row)
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{}
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result_row_impl& operator=(const raw_result_row_t& raw_result_row)
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{
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_field::operator=({raw_result_row});
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_rest::operator=(raw_result_row);
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return *this;
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}
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};
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template<size_t level, size_t index, typename AliasProvider, typename... Col, typename... Rest>
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struct result_row_impl<level, index, multi_column_t<AliasProvider, std::tuple<Col...>>, Rest...>:
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public AliasProvider::template _member_t<result_row_impl<level + 1, index, Col...>>, // level prevents identical closures to be present twice in the inheritance tree
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public result_row_impl<level, index + sizeof...(Col), Rest...>
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{
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using _multi_field = typename AliasProvider::template _member_t<result_row_impl<level + 1, index, Col...>>;
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using _rest = result_row_impl<level, index + sizeof...(Col), Rest...>;
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result_row_impl(const raw_result_row_t& raw_result_row):
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_multi_field({raw_result_row}),
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_rest(raw_result_row)
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{}
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result_row_impl& operator=(const raw_result_row_t& raw_result_row)
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{
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_multi_field::operator=({raw_result_row});
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_rest::operator=(raw_result_row);
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return *this;
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}
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};
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template<size_t level, size_t index>
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struct result_row_impl<level, index>
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{
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result_row_impl(const raw_result_row_t& raw_result_row)
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{}
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result_row_impl& operator=(const raw_result_row_t& raw_result_row)
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{
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return *this;
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}
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};
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}
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template<typename... NamedExpr>
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struct result_row_t: public detail::result_row_impl<0, 0, NamedExpr...>
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{
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bool _is_row;
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result_row_t(const raw_result_row_t& raw_result_row):
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detail::result_row_impl<0, 0, NamedExpr...>(raw_result_row),
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_is_row(raw_result_row.data != nullptr)
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{}
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result_row_t& operator=(const raw_result_row_t& raw_result_row)
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{
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detail::result_row_impl<0, 0, NamedExpr...>::operator=(raw_result_row);
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_is_row = raw_result_row.data != nullptr;
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return *this;
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}
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explicit operator bool() const
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{
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return _is_row;
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}
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};
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}
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#endif
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