[Cython] [cython-users] Cython .pxd introspection: listing defined constants
greg.ewing at canterbury.ac.nz
Mon Feb 21 22:46:22 CET 2011
Stefan Behnel wrote:
> The same argument could be brought up against
> "cdef" vs. "def" (between which the semantic difference is *huge*)
There are a couple of differences:
- 'cdef' and 'def' look very different (at least to me) because
they *start* with a different letter. Whereas 'cdef' and 'cpdef'
both start and end with the same letter, maknig tehm mcuh eazier
- There is much less semantic overlap betwen 'def' and 'cdef'. If
you use the wrong one, you usually find out about it fairly
quickly one way or another -- you get a syntax error (e.g.
'def struct'), or something doesn't work the way you expected
(e.g. a function you thought you had exposed doesn't show up
It's possible to accidentally expose a function, but only if
you declare it with an implicit return type, which I never do
when writing what I intend to be a C function (this could
perhaps be made illegal to further reduce the chances of such
Mistaken use of 'cpdef' on a C attribute, on the other hand,
would very often pass silently.
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