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e4b5408bbd
Currently apply() only works with moveable inputs. Add overloads for non-moveable inputs (reference and const reference).
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
/*
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* This file is open source software, licensed to you under the terms
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* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
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* distributed with this work for additional information regarding copyright
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* ownership. You may not use this file except in compliance with the License.
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*
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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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Copyright (C) 2014 Cloudius Systems, Ltd.
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*/
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#ifndef APPLY_HH_
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#define APPLY_HH_
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#include <tuple>
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#include <utility>
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template <typename Func, typename Args, typename IndexList>
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struct apply_helper;
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template <typename Func, typename Tuple, size_t... I>
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struct apply_helper<Func, Tuple, std::index_sequence<I...>> {
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static auto apply(Func func, Tuple args) {
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return func(std::get<I>(std::forward<Tuple>(args))...);
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}
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};
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template <typename Func, typename... T>
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inline
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auto apply(Func func, std::tuple<T...>&& args) {
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using helper = apply_helper<Func, std::tuple<T...>&&, std::index_sequence_for<T...>>;
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return helper::apply(std::move(func), std::move(args));
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}
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template <typename Func, typename... T>
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inline
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auto apply(Func func, std::tuple<T...>& args) {
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using helper = apply_helper<Func, std::tuple<T...>&, std::index_sequence_for<T...>>;
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return helper::apply(std::move(func), args);
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}
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template <typename Func, typename... T>
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inline
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auto apply(Func func, const std::tuple<T...>& args) {
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using helper = apply_helper<Func, const std::tuple<T...>&, std::index_sequence_for<T...>>;
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return helper::apply(std::move(func), args);
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}
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#endif /* APPLY_HH_ */
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