73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
/**
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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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* @file weakReferenceList.cxx
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* @author drose
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* @date 2004-09-27
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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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*
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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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* The destructor tells all of the owned references that 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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* Intended to be called only by WeakPointerTo (or by any class implementing a
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* weak reference-counting pointer), this adds the indicated PointerToVoid
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* structure to the list of such structures that are maintaining a weak
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* pointer to this object.
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*
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* When the WeakReferenceList destructs (presumably because its owning object
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* destructs), the pointer within the PointerToVoid object will be set to
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* 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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* Intended to be called only by WeakPointerTo (or by any class implementing a
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* weak reference-counting pointer), this removes the indicated PointerToVoid
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* structure from the list of such structures that are maintaining a weak
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* 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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