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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2016 Red Hat
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef SCOPE_GUARD
#define SCOPE_GUARD
#include <utility>
template <typename F>
struct scope_guard {
F f;
scope_guard() = delete;
scope_guard(const scope_guard &) = delete;
scope_guard(scope_guard &&) = default;
scope_guard & operator=(const scope_guard &) = delete;
scope_guard & operator=(scope_guard &&) = default;
scope_guard(const F& f) : f(f) {}
scope_guard(F &&f) : f(std::move(f)) {}
template<typename... Args>
scope_guard(std::in_place_t, Args&& ...args) : f(std::forward<Args>(args)...) {}
~scope_guard() {
std::move(f)(); // Support at-most-once functions
}
};
template <typename F>
[[nodiscard("Unassigned scope guards will execute immediately")]]
scope_guard<F> make_scope_guard(F &&f) {
return scope_guard<F>(std::forward<F>(f));
}
template<typename F, typename... Args>
[[nodiscard("Unassigned scope guards will execute immediately")]]
scope_guard<F> make_scope_guard(std::in_place_type_t<F>, Args&& ...args) {
return { std::in_place, std::forward<Args>(args)... };
}
#endif
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