forked from OSchip/llvm-project
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//===-------- stl_extras.h - Useful STL related functions-------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of the ORC runtime support library.
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//
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//===----------------------------------------------------------------------===//
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#ifndef ORC_RT_STL_EXTRAS_H
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#define ORC_RT_STL_EXTRAS_H
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#include <utility>
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#include <tuple>
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namespace __orc_rt {
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namespace detail {
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template <typename F, typename Tuple, std::size_t... I>
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decltype(auto) apply_tuple_impl(F &&f, Tuple &&t, std::index_sequence<I...>) {
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return std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...);
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}
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} // end namespace detail
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/// Given an input tuple (a1, a2, ..., an), pass the arguments of the
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/// tuple variadically to f as if by calling f(a1, a2, ..., an) and
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/// return the result.
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///
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/// FIXME: Switch to std::apply once we can use c++17.
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template <typename F, typename Tuple>
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decltype(auto) apply_tuple(F &&f, Tuple &&t) {
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using Indices = std::make_index_sequence<
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std::tuple_size<typename std::decay<Tuple>::type>::value>;
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return detail::apply_tuple_impl(std::forward<F>(f), std::forward<Tuple>(t),
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Indices{});
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}
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} // namespace __orc_rt
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#endif // ORC_RT_STL_EXTRAS
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