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Added column_index_sequence

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This is not necessarily sequential because there might be multi_columns.
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rbock 2014-05-07 23:54:37 +02:00
parent d831f98c9a
commit bcdcf7fa64
1 changed files with 70 additions and 0 deletions
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include/sqlpp11/detail/column_index_sequence.h Normal file
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/*
* Copyright (c) 2013-2014, Roland Bock
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SQLPP_DETAIL_COLUMN_INDEX_SEQUENCE_H
#define SQLPP_DETAIL_COLUMN_INDEX_SEQUENCE_H
#include <type_traits>
namespace sqlpp
{
namespace detail
{
template<std::size_t LastIndex, std::size_t... Ints>
struct column_index_sequence
{
static constexpr std::size_t last_index = LastIndex;
};
template<typename T, typename... Fields>
struct make_column_index_sequence_impl;
template<std::size_t LastIndex, std::size_t... Ints, typename Column, typename... Rest>
struct make_column_index_sequence_impl<column_index_sequence<LastIndex, Ints...>, Column, Rest...>
{
using type = typename make_column_index_sequence_impl<column_index_sequence<LastIndex + 1, Ints..., LastIndex + 1>, Rest...>::type;
};
template<std::size_t LastIndex, std::size_t... Ints, typename AliasProvider, typename... Fields, typename... Rest>
struct make_column_index_sequence_impl<column_index_sequence<LastIndex, Ints...>, vendor::multi_field_t<AliasProvider, Fields...>, Rest...>
{
using type = typename make_column_index_sequence_impl<column_index_sequence<LastIndex + sizeof...(Fields), Ints..., LastIndex + sizeof...(Fields)>, Rest...>::type;
};
template<std::size_t LastIndex, std::size_t... Ints>
struct make_column_index_sequence_impl<column_index_sequence<LastIndex, Ints...>>
{
using type = column_index_sequence<LastIndex, Ints...>;
};
template<std::size_t StartIndex, typename... Fields>
using make_column_index_sequence = typename make_column_index_sequence_impl<column_index_sequence<StartIndex - 1>, Fields...>::type;
}
}
#endif