69 lines
1.4 KiB
Plaintext
69 lines
1.4 KiB
Plaintext
/**
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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 p3dReferenceCount.I
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* @author drose
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* @date 2009-07-09
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*/
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/**
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*
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*/
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inline P3DReferenceCount::
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P3DReferenceCount() {
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_ref_count = 0;
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}
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/**
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*
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*/
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inline P3DReferenceCount::
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~P3DReferenceCount() {
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assert(_ref_count == 0);
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}
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/**
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* Explicitly increments the reference count.
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*/
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inline void P3DReferenceCount::
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ref() const {
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++((P3DReferenceCount *)this)->_ref_count;
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}
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/**
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* Explicitly decrements the reference count. Usually, you should call
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* p3d_unref_delete() instead.
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*
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* The return value is true if the new reference count is nonzero, false if it
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* is zero.
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*/
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inline bool P3DReferenceCount::
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unref() const {
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return --(((P3DReferenceCount *)this)->_ref_count) != 0;
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}
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/**
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* Returns the current reference count.
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*/
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inline int P3DReferenceCount::
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get_ref_count() const {
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return _ref_count;
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}
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/**
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* This global helper function will unref the given P3DReferenceCount object,
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* and if the reference count reaches zero, automatically delete it.
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*/
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template<class RefCountType>
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inline void
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p3d_unref_delete(RefCountType *ptr) {
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if (!ptr->unref()) {
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delete ptr;
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}
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}
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