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87 lines
3.6 KiB
C++
87 lines
3.6 KiB
C++
/*
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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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#ifndef SQLPP11_DETAIL_FIELD_INDEX_SEQUENCE_H
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#define SQLPP11_DETAIL_FIELD_INDEX_SEQUENCE_H
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#include <type_traits>
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#include <sqlpp11/field_spec.h>
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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 <std::size_t NextIndex, std::size_t... Ints>
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struct field_index_sequence
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{
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static constexpr std::size_t _next_index = NextIndex;
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};
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template <typename T, typename... Fields>
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struct make_field_index_sequence_impl
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{
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static_assert(wrong_t<make_field_index_sequence_impl>::value, "invalid field index sequence arguments");
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};
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template <std::size_t NextIndex,
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std::size_t... Ints,
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typename NameType,
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typename ValueType,
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bool CanBeNull,
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bool NullIsTrivialValue,
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typename... Rest>
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struct make_field_index_sequence_impl<field_index_sequence<NextIndex, Ints...>,
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field_spec_t<NameType, ValueType, CanBeNull, NullIsTrivialValue>,
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Rest...>
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{
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using type = typename make_field_index_sequence_impl<field_index_sequence<NextIndex + 1, Ints..., NextIndex>,
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Rest...>::type;
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};
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template <std::size_t NextIndex, std::size_t... Ints, typename AliasProvider, typename FieldTuple, typename... Rest>
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struct make_field_index_sequence_impl<field_index_sequence<NextIndex, Ints...>,
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multi_field_spec_t<AliasProvider, FieldTuple>,
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Rest...>
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{
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using type = typename make_field_index_sequence_impl<
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field_index_sequence<NextIndex + std::tuple_size<FieldTuple>::value, Ints..., NextIndex>,
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Rest...>::type;
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};
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template <std::size_t NextIndex, std::size_t... Ints>
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struct make_field_index_sequence_impl<field_index_sequence<NextIndex, Ints...>>
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{
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using type = field_index_sequence<NextIndex, Ints...>;
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};
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template <std::size_t StartIndex, typename... Fields>
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using make_field_index_sequence =
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typename make_field_index_sequence_impl<field_index_sequence<StartIndex>, Fields...>::type;
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} // namespace detail
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} // namespace sqlpp
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#endif
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