fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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55 lines
1.5 KiB
55 lines
1.5 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <memory>
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#include <utility>
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#include "rocksdb/rocksdb_namespace.h"
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namespace ROCKSDB_NAMESPACE {
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namespace detail {
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template <std::size_t...>
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struct IndexSequence {};
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template <std::size_t N, std::size_t... Next>
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struct IndexSequenceHelper
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: public IndexSequenceHelper<N - 1U, N - 1U, Next...> {};
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template <std::size_t... Next>
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struct IndexSequenceHelper<0U, Next...> {
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using type = IndexSequence<Next...>;
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};
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template <std::size_t N>
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using make_index_sequence = typename IndexSequenceHelper<N>::type;
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template <typename Function, typename Tuple, size_t... I>
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void call(Function f, Tuple t, IndexSequence<I...>) {
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f(std::get<I>(t)...);
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}
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template <typename Function, typename Tuple>
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void call(Function f, Tuple t) {
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static constexpr auto size = std::tuple_size<Tuple>::value;
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call(f, t, make_index_sequence<size>{});
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}
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} // namespace detail
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template <typename... Args>
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class FunctorWrapper {
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public:
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explicit FunctorWrapper(std::function<void(Args...)> functor, Args &&...args)
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: functor_(std::move(functor)), args_(std::forward<Args>(args)...) {}
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void invoke() { detail::call(functor_, args_); }
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private:
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std::function<void(Args...)> functor_;
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std::tuple<Args...> args_;
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};
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} // namespace ROCKSDB_NAMESPACE
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