61 lines
1.8 KiB
Text
61 lines
1.8 KiB
Text
/**
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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 weakPointerToVoid.I
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* @author drose
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* @date 2004-09-27
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*/
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/**
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* Sets a callback that will be made when the pointer is deleted. Does
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* nothing if this is a null pointer.
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*
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* If the pointer has already been deleted, the callback will be made
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* immediately.
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*/
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INLINE void WeakPointerToVoid::
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add_callback(WeakPointerCallback *callback) const {
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if (_weak_ref != nullptr && !_weak_ref->was_deleted()) {
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_weak_ref->add_callback(callback, _void_ptr);
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} else if (_void_ptr != nullptr) {
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callback->wp_callback(_void_ptr);
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_weak_ref = nullptr;
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}
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}
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/**
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* Removes a previously added callback.
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*/
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INLINE void WeakPointerToVoid::
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remove_callback(WeakPointerCallback *callback) const {
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if (_weak_ref != nullptr) {
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_weak_ref->remove_callback(callback);
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}
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}
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/**
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* Returns true if the object we are pointing to has been deleted, false
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* otherwise. If this returns true, it means that the pointer can not yet be
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* reused, but it does not guarantee that it can be safely accessed. See the
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* lock() method for a safe way to access the underlying pointer.
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*
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* This will always return true for a null pointer, unlike is_valid_pointer().
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*/
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INLINE bool WeakPointerToVoid::
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was_deleted() const {
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return _void_ptr != nullptr && (_weak_ref == nullptr || _weak_ref->was_deleted());
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}
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/**
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* Returns true if the pointer is not null and the object has not been
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* deleted. See was_deleted() for caveats.
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*/
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INLINE bool WeakPointerToVoid::
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is_valid_pointer() const {
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return _weak_ref != nullptr && !_weak_ref->was_deleted();
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}
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