[Cython] Error handling during buffer reassignment
stefan_ml at behnel.de
Wed Sep 6 06:53:14 EDT 2017
consider this code:
cdef np.ndarray[int32, ndim=1] a
a = new_int32_buffer()
a = new_float32_buffer()
This fails during the second assignment, but only during validation, after
unpacking the buffer. The code that handles this case is generated here:
Note the twist where it says:
# If acquisition failed, attempt to reacquire the old buffer
# before raising the exception.
I faintly remember a discussion about that case (apparently back in 2008),
but can't find it in my mail archive. Might have been off-list at the time.
Question: Instead of re-acquiring the buffer (and thus faking the
non-assignment), wouldn't it be better to acquire the new buffer in a temp,
and only overwrite the old "Py_buffer" if all is fine with it?
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