Panda3D
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00001 // Filename: weakNodePath.h 00002 // Created by: drose (29Sep04) 00003 // 00004 //////////////////////////////////////////////////////////////////// 00005 // 00006 // PANDA 3D SOFTWARE 00007 // Copyright (c) Carnegie Mellon University. All rights reserved. 00008 // 00009 // All use of this software is subject to the terms of the revised BSD 00010 // license. You should have received a copy of this license along 00011 // with this source code in a file named "LICENSE." 00012 // 00013 //////////////////////////////////////////////////////////////////// 00014 00015 #ifndef WEAKNODEPATH_H 00016 #define WEAKNODEPATH_H 00017 00018 #include "pandabase.h" 00019 00020 #include "nodePath.h" 00021 #include "nodePathComponent.h" 00022 #include "weakPointerTo.h" 00023 00024 //////////////////////////////////////////////////////////////////// 00025 // Class : WeakNodePath 00026 // Description : This class is a wrapper around a NodePath that, 00027 // unlike the actual NodePath class, doesn't hold a 00028 // reference count to the node. Thus the node may be 00029 // detached from the scene graph and destructed at any 00030 // time. 00031 // 00032 // You can call is_valid() or was_deleted() at any time 00033 // to determine whether the node is still around; if it 00034 // is, get_node_path() will return the associated 00035 // NodePath. 00036 //////////////////////////////////////////////////////////////////// 00037 class EXPCL_PANDA_PGRAPH WeakNodePath { 00038 public: 00039 INLINE WeakNodePath(const NodePath &node_path); 00040 INLINE WeakNodePath(const WeakNodePath ©); 00041 INLINE ~WeakNodePath(); 00042 00043 INLINE void operator = (const NodePath &node_path); 00044 INLINE void operator = (const WeakNodePath ©); 00045 00046 INLINE bool is_empty() const; 00047 INLINE bool was_deleted() const; 00048 00049 INLINE NodePath get_node_path() const; 00050 INLINE PandaNode *node() const; 00051 00052 INLINE bool operator == (const NodePath &other) const; 00053 INLINE bool operator != (const NodePath &other) const; 00054 INLINE bool operator < (const NodePath &other) const; 00055 INLINE int compare_to(const NodePath &other) const; 00056 00057 INLINE bool operator == (const WeakNodePath &other) const; 00058 INLINE bool operator != (const WeakNodePath &other) const; 00059 INLINE bool operator < (const WeakNodePath &other) const; 00060 INLINE int compare_to(const WeakNodePath &other) const; 00061 00062 INLINE int get_key() const; 00063 00064 void output(ostream &out) const; 00065 00066 private: 00067 WPT(NodePathComponent) _head; 00068 int _backup_key; 00069 }; 00070 00071 INLINE ostream &operator << (ostream &out, const WeakNodePath &node_path); 00072 00073 #include "weakNodePath.I" 00074 00075 #endif