Calling C++ from Python (2)

In case we work with copied data, we must copy both ways: 
a_p = self.c.py2my_copy(a)
x_p = self.c.py2my_copy(self.xcoor)
y_p = self.c.py2my_copy(self.ycoor)
f_p = self.c.set_pyfunc(func)
ext_gridloop.gridloop1(a_p, x_p, y_p, f_p)
a = self.c.my2py_copy(a_p)
return a
Note: final a is not the same a object as we started with

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