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Open Source Computer Vision Library
https://opencv.org/
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76 lines
3.5 KiB
76 lines
3.5 KiB
15 years ago
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/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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//
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//
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// Intel License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000, Intel Corporation, all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * The name of Intel Corporation may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// This software is provided by the copyright holders and contributors "as is" and
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// any express or implied warranties, including, but not limited to, the implied
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// indirect, incidental, special, exemplary, or consequential damages
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// (including, but not limited to, procurement of substitute goods or services;
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// loss of use, data, or profits; or business interruption) however caused
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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//
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//M*/
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/* This file contains swig macros that are used in several typemap files */
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%define %myshadow(function)
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%ignore function;
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%rename (function) function##_Shadow;
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%enddef
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// Elsewhere in this wrapper, the cvRelease* functions are mapped to
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// the destructors for the corresponding OpenCV object wrapper. This
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// is done in order to let Python handle memory management. If the
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// reference count of the Python object wrapping the OpenCV object
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// goes to 0, the garbage collector will call the destructor, and
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// therefore the cvRelease* function, before freeing the Python object.
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// However, if the user explicitly calls the cvRelease* function, we
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// must prevent the Python garbage collector from calling it again when
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// the refcount reaches 0 -- otherwise a double-free error occurs.
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//
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// Thus, below, we redirect each cvRelease* function to the
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// corresponding OpenCV object's destructor. This has the effect of:
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// (1) Calling the corresponding cvRelease* function, and therefore
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// immediately releasing the OpenCV object.
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// (2) Telling SWIG to disown memory management for this OpenCV object.
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//
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// Thus, when the refcount for the Python object reaches 0, the Python
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// object is garbage collected, but since it no longer owns the OpenCV
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// object, this is not freed again.
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%define %myrelease(module, Function, Type)
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%ignore Function;
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%rename (Function) Function##_Shadow;
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%pythoncode %{
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Function = _##module##.delete_##Type
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%}
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%enddef
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