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1///////////////////////////////////////////////////////////////////////////////
2// Name: wx/recguard.h
3// Purpose: declaration and implementation of wxRecursionGuard class
4// Author: Vadim Zeitlin
5// Modified by:
6// Created: 14.08.2003
7// RCS-ID: $Id$
8// Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
9// Licence: wxWindows licence
10///////////////////////////////////////////////////////////////////////////////
11
12#ifndef _WX_RECGUARD_H_
13#define _WX_RECGUARD_H_
14
15#include "wx/defs.h"
16
17// ----------------------------------------------------------------------------
18// wxRecursionGuardFlag is used with wxRecursionGuard
19// ----------------------------------------------------------------------------
20
21typedef int wxRecursionGuardFlag;
22
23// ----------------------------------------------------------------------------
24// wxRecursionGuard is the simplest way to protect a function from reentrancy
25// ----------------------------------------------------------------------------
26
27class WXDLLIMPEXP_BASE wxRecursionGuard
28{
29public:
30 wxRecursionGuard(wxRecursionGuardFlag& flag)
31 : m_flag(flag)
32 {
33 m_isInside = flag++ != 0;
34 }
35
36 ~wxRecursionGuard()
37 {
38 wxASSERT_MSG( m_flag > 0, _T("unbalanced wxRecursionGuards!?") );
39
40 m_flag--;
41 }
42
43 bool IsInside() const { return m_isInside; }
44
45private:
46 wxRecursionGuardFlag& m_flag;
47
48 // true if the flag had been already set when we were created
49 bool m_isInside;
50};
51
52#endif // _WX_RECGUARD_H_
53