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Added index_sequence (until it can be used with C++14)

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rbock 2014-05-06 22:20:24 +02:00
parent 4c3e73f819
commit 2124005bd8
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include/sqlpp11/detail/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_INDEX_SEQUENCE_H
#define SQLPP_DETAIL_INDEX_SEQUENCE_H
#include <type_traits>
namespace sqlpp
{
namespace detail
{
// Note: This is a minimalistic implementation of index_sequence available in C++14
// It should be replaced once the project is moved to C++14 or beyond
template<std::size_t... Ints>
struct index_sequence
{};
template<typename T, std::size_t N>
struct make_index_sequence_impl;
template<std::size_t N, std::size_t... Ints>
struct make_index_sequence_impl<index_sequence<Ints...>, N>
{
using type = typename make_index_sequence_impl<index_sequence<Ints..., sizeof...(Ints)>, N - 1>::type;
};
template<std::size_t... Ints>
struct make_index_sequence_impl<index_sequence<Ints...>, 0>
{
using type = index_sequence<Ints...>;
};
template<std::size_t N>
using make_index_sequence = typename make_index_sequence_impl<index_sequence<>, N>::type;
}
}
#endif