1 /* scoped_restore, a simple class for saving and restoring a value
3 Copyright (C) 2016 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #ifndef SCOPED_RESTORE_H
21 #define SCOPED_RESTORE_H
23 /* Base class for scoped_restore_tmpl. */
24 struct scoped_restore_base
28 /* A convenience typedef. Users of make_scoped_restore declare the
29 local RAII object as having this type. */
30 typedef const scoped_restore_base
&scoped_restore
;
32 /* An RAII-based object that saves a variable's value, and then
33 restores it again when this object is destroyed. */
35 class scoped_restore_tmpl
: public scoped_restore_base
39 /* Create a new scoped_restore object that saves the current value
40 of *VAR. *VAR will be restored when this scoped_restore object
42 scoped_restore_tmpl (T
*var
)
48 /* Create a new scoped_restore object that saves the current value
49 of *VAR, and sets *VAR to VALUE. *VAR will be restored when this
50 scoped_restore object is destroyed. */
51 scoped_restore_tmpl (T
*var
, T value
)
58 scoped_restore_tmpl (const scoped_restore_tmpl
<T
> &other
)
59 : m_saved_var (other
.m_saved_var
),
60 m_saved_value (other
.m_saved_value
)
62 other
.m_saved_var
= NULL
;
65 ~scoped_restore_tmpl ()
67 if (m_saved_var
!= NULL
)
68 *m_saved_var
= m_saved_value
;
73 /* No need for this. It is intentionally not defined anywhere. */
74 scoped_restore_tmpl
&operator= (const scoped_restore_tmpl
&);
76 /* The saved variable. */
77 mutable T
*m_saved_var
;
79 /* The saved value. */
80 const T m_saved_value
;
83 /* Make a scoped_restore. This is useful because it lets template
84 argument deduction work. */
86 scoped_restore_tmpl
<T
> make_scoped_restore (T
*var
)
88 return scoped_restore_tmpl
<T
> (var
);
91 /* Make a scoped_restore. This is useful because it lets template
92 argument deduction work. */
94 scoped_restore_tmpl
<T
> make_scoped_restore (T
*var
, T value
)
96 return scoped_restore_tmpl
<T
> (var
, value
);
99 #endif /* SCOPED_RESTORE_H */
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