Commit 2f3ee7ad authored by scoder's avatar scoder Committed by GitHub

Merge pull request #2278 from gabrieldemarmiesse/transfer_note_from_cinit_and_init

Transfered a note from the reference guide extension types to the userguide.
parents 385b37fa 13ec8f0d
......@@ -71,7 +71,18 @@ your :meth:`__cinit__`` method to take no arguments (other than self) it
will simply ignore any extra arguments passed to the constructor without
complaining about the signature mismatch.
.. Note: Older Cython files may use :meth:`__new__` rather than :meth:`__cinit__`. The two are synonyms.
.. Note::
All constructor arguments will be passed as Python objects.
This implies that non-convertible C types such as pointers or C++ objects
cannot be passed into the constructor from Cython code. If this is needed,
use a factory function instead that handles the object initialisation.
It often helps to directly call ``__new__()`` in this function to bypass the
call to the ``__init__()`` constructor.
.. Note::
Older Cython files may use :meth:`__new__` rather than :meth:`__cinit__`. The two are synonyms.
The name change from :meth:`__new__` to :meth:`__cinit__` was to avoid
confusion with Python :meth:`__new__` (which is an entirely different
concept) and eventually the use of :meth:`__new__` in Cython will be
......
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