4f4c5fcfdf
This is a combination of running clang-tidy with modernize-use-nullptr check for some ports (GTK, X11, OSX) and manual changes to the ports for which it couldn't be used easily (MSW, DFB) and also manually updating the docs. Also replace NULL with null or nullptr in the comments as this is more consistent with the use of nullptr in the code and makes it simpler to grep for the remaining occurrences of NULL itself. And also use null in the assert messages. Only a few occurrences of "NULL" are still left in non-C files, mostly corresponding to unclear comments or string output which it might not be safe to change.
91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/tracker.h
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// Purpose: Support class for object lifetime tracking (wxWeakRef<T>)
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// Author: Arne Steinarson
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// Created: 28 Dec 07
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// Copyright: (c) 2007 Arne Steinarson
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_TRACKER_H_
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#define _WX_TRACKER_H_
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#include "wx/defs.h"
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class wxEventConnectionRef;
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// This class represents an object tracker and is stored in a linked list
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// in the tracked object. It is only used in one of its derived forms.
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class WXDLLIMPEXP_BASE wxTrackerNode
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{
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public:
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wxTrackerNode() : m_nxt(nullptr) { }
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virtual ~wxTrackerNode() { }
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virtual void OnObjectDestroy() = 0;
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virtual wxEventConnectionRef *ToEventConnection() { return nullptr; }
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private:
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wxTrackerNode *m_nxt;
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friend class wxTrackable; // For list access
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friend class wxEvtHandler; // For list access
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};
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// Add-on base class for a trackable object.
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class WXDLLIMPEXP_BASE wxTrackable
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{
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public:
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void AddNode(wxTrackerNode *prn)
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{
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prn->m_nxt = m_first;
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m_first = prn;
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}
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void RemoveNode(wxTrackerNode *prn)
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{
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for ( wxTrackerNode **pprn = &m_first; *pprn; pprn = &(*pprn)->m_nxt )
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{
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if ( *pprn == prn )
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{
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*pprn = prn->m_nxt;
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return;
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}
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}
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wxFAIL_MSG( "removing invalid tracker node" );
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}
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wxTrackerNode *GetFirst() const { return m_first; }
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protected:
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// this class is only supposed to be used as a base class but never be
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// created nor destroyed directly so all ctors and dtor are protected
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wxTrackable() : m_first(nullptr) { }
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// copy ctor and assignment operator intentionally do not copy m_first: the
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// objects which track the original trackable shouldn't track the new copy
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wxTrackable(const wxTrackable& WXUNUSED(other)) : m_first(nullptr) { }
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wxTrackable& operator=(const wxTrackable& WXUNUSED(other)) { return *this; }
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// dtor is not virtual: this class is not supposed to be used
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// polymorphically and adding a virtual table to it would add unwanted
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// overhead
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~wxTrackable()
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{
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// Notify all registered refs
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while ( m_first )
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{
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wxTrackerNode * const first = m_first;
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m_first = first->m_nxt;
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first->OnObjectDestroy();
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}
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}
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wxTrackerNode *m_first;
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};
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#endif // _WX_TRACKER_H_
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