mirror of https://github.com/ARMmbed/mbed-os.git
95 lines
2.7 KiB
Plaintext
95 lines
2.7 KiB
Plaintext
/* mbed Microcontroller Library
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* Copyright (c) 2019 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES LEOR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MSTD_TUPLE_
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#define MSTD_TUPLE_
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/* <mstd_tuple>
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*
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* - includes toolchain's <tuple>
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* - For all toolchains, C++17 backports:
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* - mstd::apply
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* - mstd::make_from_tuple
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*/
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#include <tuple>
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#if __cpp_lib_apply < 201603 || __cpp_lib_make_from_tuple < 201606
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#include <mstd_utility> // integer_sequence
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#endif
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#if __cpp_lib_apply < 201603
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#include <mstd_functional> // invoke
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#endif
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namespace mstd {
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using std::tuple;
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using std::ignore;
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using std::make_tuple;
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using std::forward_as_tuple;
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using std::tie;
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using std::tuple_cat;
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// [tuple.apply]
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#if __cpp_lib_apply >= 201603
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using std::apply;
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#else
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namespace impl {
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template <class F, class Tuple, size_t... I>
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invoke_result_t<F, tuple_element_t<I, Tuple>...> apply(F&& f, Tuple&& t, std::index_sequence<I...>)
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{
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return mstd::invoke(std::forward<F>(f), std::get<I>(std::forward<Tuple>(t))...);
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}
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}
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// apply<F, Tuple> - works also for tuple-like objects such as array or pair
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// user-defined types can specialize std::get and std::tuple_size to make this work
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template <class F, class Tuple>
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auto apply(F&& f, Tuple&& t) ->
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decltype(impl::apply(std::forward<F>(f), std::forward<Tuple>(t), std::make_index_sequence<tuple_size<remove_reference_t<Tuple>>::value>{}))
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{
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return impl::apply(std::forward<F>(f), std::forward<Tuple>(t),
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std::make_index_sequence<std::tuple_size<std::remove_reference_t<Tuple>>::value>{});
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}
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#endif
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#if __cpp_lib_make_from_tuple >= 201606
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using std::make_from_tuple;
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#else
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namespace impl {
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template <class T, class Tuple, size_t... I>
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T make_from_tuple(Tuple&& t, std::index_sequence<I...>)
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{
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return T(std::get<I>(std::forward<Tuple>(t))...);
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}
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}
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template <class T, class Tuple>
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T make_from_tuple(Tuple&& t)
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{
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return impl::make_from_tuple<T>(std::forward<Tuple>(t),
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std::make_index_sequence<std::tuple_size<std::remove_reference_t<Tuple>>::value>{});
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}
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#endif
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using std::tuple_size;
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using std::tuple_element;
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using std::tuple_element_t;
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using std::get;
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} // namespace mstd
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#endif // MSTD_TUPLE_
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