1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/*
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
*/
#pragma once
#include <utility>
namespace pzstd {
/**
* Dismissable scope guard.
* `Function` must be callable and take no parameters.
* Unless `dissmiss()` is called, the callable is executed upon destruction of
* `ScopeGuard`.
*
* Example:
*
* auto guard = makeScopeGuard([&] { cleanup(); });
*/
template <typename Function>
class ScopeGuard {
Function function;
bool dismissed;
public:
explicit ScopeGuard(Function&& function)
: function(std::move(function)), dismissed(false) {}
void dismiss() {
dismissed = true;
}
~ScopeGuard() noexcept {
if (!dismissed) {
function();
}
}
};
/// Creates a scope guard from `function`.
template <typename Function>
ScopeGuard<Function> makeScopeGuard(Function&& function) {
return ScopeGuard<Function>(std::forward<Function>(function));
}
}
|
