92 lines
2.5 KiB
Text
92 lines
2.5 KiB
Text
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/**
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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 dcast.T
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* @author drose
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* @date 2001-08-06
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*/
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/**
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* Returns the TypeHandle associated with the type of the parameter, if it can
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* be determined. This is a support function for _dcast, below.
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*/
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template<class WantType>
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INLINE TypeHandle
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_dcast_get_typehandle(WantType *) {
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TAU_PROFILE("_dcast_get_typehandle()", " ", TAU_USER);
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TypeHandle handle = WantType::get_class_type();
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#ifdef _DEBUG
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if (handle == TypeHandle::none()) {
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// This type handle is unregistered. Oops!
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WantType::init_type();
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handle = WantType::get_class_type();
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express_cat->warning()
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<< "Type " << handle << " was unregistered!\n";
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}
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#endif
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return handle;
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}
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/**
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* The implementation of the DCAST macro, this checks the actual type of the
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* pointer before performing a downcast operation. In NDEBUG mode, it simply
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* downcasts.
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*
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* This flavor of _dcast works on non-const pointers.
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*/
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template<class WantType>
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INLINE WantType *
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_dcast(WantType *, TypedObject *ptr) {
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#ifdef DO_DCAST
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TAU_PROFILE("_dcast()", " ", TAU_USER);
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TypeHandle want_handle = _dcast_get_typehandle((WantType *)0);
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if (!_dcast_verify(want_handle, sizeof(WantType), ptr)) {
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return (WantType *)NULL;
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}
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#endif
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return (WantType *)ptr;
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}
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/**
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* The implementation of the DCAST macro, this checks the actual type of the
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* pointer before performing a downcast operation. In NDEBUG mode, it simply
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* downcasts.
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*
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* This flavor of _dcast works on const pointers.
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*/
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template<class WantType>
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INLINE const WantType *
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_dcast(WantType *, const TypedObject *ptr) {
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#ifdef DO_DCAST
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TAU_PROFILE("_dcast()", " ", TAU_USER);
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TypeHandle want_handle = _dcast_get_typehandle((WantType *)0);
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if (!_dcast_verify(want_handle, sizeof(WantType), ptr)) {
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return (const WantType *)NULL;
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}
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#endif
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return (const WantType *)ptr;
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}
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/**
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* Similar to the above, with a pointer reference as the first parameter.
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* Just for fiddly compiler reasons; the reference isn't used.
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*/
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template<class WantType>
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INLINE WantType *
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_dcast_ref(WantType *&, TypedObject *ptr) {
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return _dcast((WantType *)NULL, ptr);
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}
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template<class WantType>
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INLINE const WantType *
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_dcast_ref(WantType *&, const TypedObject *ptr) {
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return _dcast((WantType *)NULL, ptr);
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}
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