85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
// Filename: weakReferenceList.cxx
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// Created by: drose (27Sep04)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) Carnegie Mellon University. All rights reserved.
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//
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// All use of this software is subject to the terms of the revised BSD
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// license. You should have received a copy of this license along
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// with this source code in a file named "LICENSE."
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//
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////////////////////////////////////////////////////////////////////
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#include "weakReferenceList.h"
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#include "weakPointerToVoid.h"
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#include "pnotify.h"
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////////////////////////////////////////////////////////////////////
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// Function: WeakReferenceList::Constructor
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// Access: Public
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// Description:
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////////////////////////////////////////////////////////////////////
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WeakReferenceList::
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WeakReferenceList() {
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}
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////////////////////////////////////////////////////////////////////
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// Function: WeakReferenceList::Destructor
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// Access: Public
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// Description: The destructor tells all of the owned references that
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// we're gone.
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////////////////////////////////////////////////////////////////////
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WeakReferenceList::
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~WeakReferenceList() {
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_lock.acquire();
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Pointers::iterator pi;
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for (pi = _pointers.begin(); pi != _pointers.end(); ++pi) {
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(*pi)->mark_deleted();
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}
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_lock.release();
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}
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////////////////////////////////////////////////////////////////////
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// Function: WeakReferenceList::add_reference
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// Access: Public
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// Description: Intended to be called only by WeakPointerTo (or by
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// any class implementing a weak reference-counting
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// pointer), this adds the indicated PointerToVoid
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// structure to the list of such structures that are
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// maintaining a weak pointer to this object.
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//
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// When the WeakReferenceList destructs (presumably
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// because its owning object destructs), the pointer
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// within the PointerToVoid object will be set to NULL.
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////////////////////////////////////////////////////////////////////
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void WeakReferenceList::
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add_reference(WeakPointerToVoid *ptv) {
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_lock.acquire();
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bool inserted = _pointers.insert(ptv).second;
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_lock.release();
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nassertv(inserted);
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}
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////////////////////////////////////////////////////////////////////
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// Function: WeakReferenceList::clear_reference
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// Access: Public
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// Description: Intended to be called only by WeakPointerTo (or by
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// any class implementing a weak reference-counting
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// pointer), this removes the indicated PointerToVoid
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// structure from the list of such structures that are
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// maintaining a weak pointer to this object.
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////////////////////////////////////////////////////////////////////
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void WeakReferenceList::
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clear_reference(WeakPointerToVoid *ptv) {
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_lock.acquire();
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Pointers::iterator pi = _pointers.find(ptv);
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bool valid = (pi != _pointers.end());
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if (valid) {
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_pointers.erase(pi);
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}
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_lock.release();
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nassertv(valid);
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}
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