Panda3D
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dcast.cxx
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file dcast.cxx
10 * @author drose
11 * @date 2001-08-07
12 */
13
14#include "dcast.h"
15#include "config_express.h"
16
17#ifdef _WIN32
18#ifndef WIN32_LEAN_AND_MEAN
19#define WIN32_LEAN_AND_MEAN 1
20#endif
21#include <windows.h> // for IsBadWritePtr()
22#endif
23
24/**
25 * This function performs the actual check that the indicated TypedObject
26 * pointer is of the intended type.
27 */
28bool
29_dcast_verify(TypeHandle want_handle, size_t want_size,
30 const TypedObject *ptr) {
31#ifdef DO_DCAST
32 if (get_verify_dcast()) {
33 if (ptr == nullptr) {
34 // This is allowed these days. It used to be an error, but what the
35 // heck.
36 return true;
37 }
38#if defined(_DEBUG) && defined(_WIN32)
39 if (IsBadWritePtr((TypedObject *)ptr, want_size)) {
40 express_cat->warning()
41 << "Attempt to cast invalid pointer to "
42 << want_handle << "\n";
43 return false;
44 }
45#endif
46 if (!ptr->is_of_type(want_handle)) {
47 express_cat->error()
48 << "Attempt to cast pointer from " << ptr->get_type()
49 << " to " << want_handle << "\n";
50 if (ptr->get_type() == TypedObject::get_class_type()) {
51 express_cat->error(false)
52 << "Perhaps pointer was inadvertently deleted?\n";
53 }
54 return false;
55 }
56 }
57#endif // DO_DCAST
58
59 return true;
60}
TypeHandle is the identifier used to differentiate C++ class types.
Definition typeHandle.h:81
This is an abstract class that all classes which use TypeHandle, and also provide virtual functions t...
Definition typedObject.h:88
bool is_of_type(TypeHandle handle) const
Returns true if the current object is or derives from the indicated type.
Definition typedObject.I:28
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
bool _dcast_verify(TypeHandle want_handle, size_t want_size, const TypedObject *ptr)
This function performs the actual check that the indicated TypedObject pointer is of the intended typ...
Definition dcast.cxx:29
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.