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/*
* Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _NDARRAY_CXX14_H_
#define _NDARRAY_CXX14_H_
namespace ndarray
{
namespace cxx14
{
template <size_t... Nums> struct index_sequence
{
using value_type = size_t;
static constexpr std::size_t size() noexcept { return sizeof...(Nums); }
};
namespace detail
{
template <size_t v, typename Seq> struct _append;
template <size_t v, size_t... Nums> struct _append<v, index_sequence<Nums...>>
{
using result = index_sequence<Nums..., v>;
};
template <size_t Len> struct make_index_sequence
{
using result =
typename detail::_append<Len - 1, typename make_index_sequence<Len - 1>::result>::result;
};
template <> struct make_index_sequence<1>
{
using result = index_sequence<0>;
};
template <> struct make_index_sequence<0>
{
using result = index_sequence<>;
};
} // namespace detail
template <size_t Num> using make_index_sequence = typename detail::make_index_sequence<Num>::result;
} // namespace cxx14
} // namespace ndarray
#endif //_NDARRAY_CXX14_H_
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