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added warning about wrapping wrapped functions

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Wenzel Jakob 2015-11-17 08:30:34 +01:00
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@ -160,6 +160,14 @@ The following interactive session shows how to call them from Python.
The file :file:`example/example5.cpp` contains a complete example that The file :file:`example/example5.cpp` contains a complete example that
demonstrates how to work with callbacks and anonymous functions in more detail. demonstrates how to work with callbacks and anonymous functions in more detail.
.. warning::
Keep in mind that passing a function from C++ to Python (or vice versa)
will instantiate a piece of wrapper code that translates function
invocations between the two languages. Copying the same function back and
forth between Python and C++ many times in a row will cause these wrappers
to accumulate, which can decrease performance.
Overriding virtual functions in Python Overriding virtual functions in Python
====================================== ======================================