1 /*M///////////////////////////////////////////////////////////////////////////////////////
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11 // For Open Source Computer Vision Library
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42 /* This file contains swig macros that are used in several typemap files */
45 %define %myshadow(function)
47 %rename (function) function##_Shadow;
50 // Elsewhere in this wrapper, the cvRelease* functions are mapped to
51 // the destructors for the corresponding OpenCV object wrapper. This
52 // is done in order to let Python handle memory management. If the
53 // reference count of the Python object wrapping the OpenCV object
54 // goes to 0, the garbage collector will call the destructor, and
55 // therefore the cvRelease* function, before freeing the Python object.
56 // However, if the user explicitly calls the cvRelease* function, we
57 // must prevent the Python garbage collector from calling it again when
58 // the refcount reaches 0 -- otherwise a double-free error occurs.
60 // Thus, below, we redirect each cvRelease* function to the
61 // corresponding OpenCV object's destructor. This has the effect of:
62 // (1) Calling the corresponding cvRelease* function, and therefore
63 // immediately releasing the OpenCV object.
64 // (2) Telling SWIG to disown memory management for this OpenCV object.
66 // Thus, when the refcount for the Python object reaches 0, the Python
67 // object is garbage collected, but since it no longer owns the OpenCV
68 // object, this is not freed again.
69 %define %myrelease(module, Function, Type)
71 %rename (Function) Function##_Shadow;
73 Function = _##module##.delete_##Type