45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
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/**
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*
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* package.h
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* An Tao
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*
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* Copyright 2018, An Tao. All rights reserved.
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* https://github.com/an-tao/drogon
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* Use of this source code is governed by a MIT license
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* that can be found in the License file.
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*
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* Drogon
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*
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*/
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#pragma once
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#if __cplusplus >= 201703L || (defined _MSC_VER && _MSC_VER > 1900)
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#include <tuple>
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#else
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#include <utility>
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namespace
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{
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template <typename F, typename Tuple, std::size_t... I>
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constexpr decltype(auto) apply_impl(F &&f, Tuple &&t, std::index_sequence<I...>)
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{
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return static_cast<F &&>(f)(std::get<I>(static_cast<Tuple &&>(t))...);
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}
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} // anonymous namespace
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#endif
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namespace drogon
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{
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#if __cplusplus >= 201703L || (defined _MSC_VER && _MSC_VER > 1900)
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using std::apply;
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#else
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template <typename F, typename Tuple>
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constexpr decltype(auto) apply(F &&f, Tuple &&t)
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{
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return apply_impl(
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std::forward<F>(f),
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std::forward<Tuple>(t),
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std::make_index_sequence<
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std::tuple_size<std::remove_reference_t<Tuple> >::value>{});
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}
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#endif
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} // namespace drogon
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