152 lines
4.6 KiB
C++
152 lines
4.6 KiB
C++
/***************************************************************************************************
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* Copyright (c) 2023 - 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED 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
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************************************/
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#pragma once
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#include <cute/config.hpp>
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#include <cute/util/type_traits.hpp>
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#include <cute/numeric/integral_constant.hpp>
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namespace cute
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{
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using CUTE_STL_NAMESPACE::integer_sequence;
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using CUTE_STL_NAMESPACE::make_integer_sequence;
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namespace detail {
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template <class T, class S, T Begin>
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struct range_impl;
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template <class T, T... N, T Begin>
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struct range_impl<T, integer_sequence<T, N...>, Begin> {
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using type = integer_sequence<T, N+Begin...>;
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};
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template <class S>
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struct reverse_impl;
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template <class T, T... N>
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struct reverse_impl<integer_sequence<T, N...>> {
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using type = integer_sequence<T, sizeof...(N)-1-N...>;
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};
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} // end namespace detail
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template <class T, T Begin, T End>
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using make_integer_range = typename detail::range_impl<
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T,
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make_integer_sequence<T, (End-Begin > 0) ? (End-Begin) : 0>,
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Begin>::type;
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template <class T, T N>
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using make_integer_sequence_reverse = typename detail::reverse_impl<
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make_integer_sequence<T, N>>::type;
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//
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// Common aliases
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//
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// int_sequence
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template <int... Ints>
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using int_sequence = integer_sequence<int, Ints...>;
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template <int N>
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using make_int_sequence = make_integer_sequence<int, N>;
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template <int N>
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using make_int_rsequence = make_integer_sequence_reverse<int, N>;
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template <int Begin, int End>
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using make_int_range = make_integer_range<int, Begin, End>;
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// index_sequence
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template <size_t... Ints>
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using index_sequence = integer_sequence<size_t, Ints...>;
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template <size_t N>
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using make_index_sequence = make_integer_sequence<size_t, N>;
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template <size_t N>
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using make_index_rsequence = make_integer_sequence_reverse<size_t, N>;
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template <size_t Begin, size_t End>
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using make_index_range = make_integer_range<size_t, Begin, End>;
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//
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// Shortcuts
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//
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template <int... Ints>
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using seq = int_sequence<Ints...>;
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template <int N>
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using make_seq = make_int_sequence<N>;
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template <int N>
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using make_rseq = make_int_rsequence<N>;
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template <int Min, int Max>
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using make_range = make_int_range<Min, Max>;
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template <class Tuple>
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using tuple_seq = make_seq<tuple_size<remove_cvref_t<Tuple>>::value>;
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template <class Tuple>
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using tuple_rseq = make_rseq<tuple_size<remove_cvref_t<Tuple>>::value>;
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//
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// Specialize cute::tuple-traits for std::integer_sequence
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//
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template <class T, T... Ints>
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struct tuple_size<integer_sequence<T, Ints...>>
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: cute::integral_constant<size_t, sizeof...(Ints)>
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{};
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template <size_t I, class T, T... Is>
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struct tuple_element<I, integer_sequence<T, Is...>>
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{
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constexpr static T idx[sizeof...(Is)] = {Is...};
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using type = cute::integral_constant<T, idx[I]>;
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};
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template <size_t I, class T, T... Ints>
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CUTE_HOST_DEVICE constexpr
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tuple_element_t<I, integer_sequence<T, Ints...>>
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get(integer_sequence<T, Ints...>) {
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static_assert(I < sizeof...(Ints), "Index out of range");
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return {};
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}
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} // end namespace cute
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