On Apr 27, 2009, at 7:35 PM, Danilo Freitas wrote:
> 2009/4/27 Robert Bradshaw <[email protected]>:
>> On Apr 27, 2009, at 6:08 PM, Greg Ewing wrote:
>>
>>> Robert Bradshaw wrote:
>>>
>>>> That's because x[0] was always the same thing as (*x), even if a
>>>> bit
>>>> uglier. I'm not not as enthusiastic about it now (though not yet
>>>> for
>>>> sure set against it either...)
>>>
>>> The reason for not having a * operator in Pyrex was to
>>> avoid possible ambiguities when parsing arguments to
>>> function calls (since Python already assigns a meaning
>>> to prefix * in that context).
>>>
>>> If you want to introduce a * operator you'll have to
>>> deal with that somehow.
>>
>> Nice to know the original reasoning. Well, that's another strike
>> against it, and in this case "two strikes you're out" is enough
>> for me.
>>
> So, we should really use deref()?
Yes, I think so.
We could declare
cdef extern from "foo.h":
cclass Foo: # or whatever else we come up with here
Foo __add__(Foo, Foo)
Foo __add__(Foo, int)
int __dereference__(Foo)
Foo __increment__(Foo)
...
This would indicate that Foo supports addition with other Foos and
ints, incrementing, and that cython.deref(Foo) is an int. The magic
cython.deref method would see if a __dereference__ method is
declared, and if not would allow the default behavior for pointer
types, otherwise raising an error. An actual (*x) would be emitted in
the code. Likewise with increment/decrement.
- Robert
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