blob: 72fa43aa90d082497ee458eecdd721734ec5c190 (
plain)
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
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_COMPHELPER_FLAGGUARD_HXX
#define INCLUDED_COMPHELPER_FLAGGUARD_HXX
#include <comphelper/scopeguard.hxx>
#include <utility>
namespace comphelper
{
//= ValueRestorationGuard
// note: can't store the originalValue in a ValueRestorationGuard member,
// because it will be used from base class dtor
template <typename T> struct ValueRestorationGuard_Impl
{
T& rVal;
T const originalValue;
ValueRestorationGuard_Impl(T& i_valRef)
: rVal(i_valRef), originalValue(i_valRef) {}
void operator()()
{
rVal = originalValue;
}
};
template <typename T>
class ValueRestorationGuard : public ScopeGuard<ValueRestorationGuard_Impl<T>>
{
public:
ValueRestorationGuard(T& i_valRef)
: ScopeGuard<ValueRestorationGuard_Impl<T>>(ValueRestorationGuard_Impl(i_valRef))
{}
template <typename T1>
ValueRestorationGuard(T& i_valRef, T1&& i_temporaryValue)
: ScopeGuard<ValueRestorationGuard_Impl<T>>(ValueRestorationGuard_Impl(i_valRef))
{
i_valRef = std::forward<T1>(i_temporaryValue);
}
};
typedef ValueRestorationGuard<bool> FlagRestorationGuard;
//= FlagGuard
// Guarantees that the flag is true within the scope of the guard, and is set to false after
// its destruction, regardless of initial flag value
class FlagGuard : public FlagRestorationGuard
{
public:
// Set flag to false before passing its reference to base class ctor, so that it would be
// reset back to false in base class dtor
explicit FlagGuard(bool& i_flagRef)
: FlagRestorationGuard((i_flagRef = false), true)
{
}
};
} // namespace comphelper
#endif // INCLUDED_COMPHELPER_FLAGGUARD_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
