[Pyrex] The "++" operator gets stripped out (as in "++x")

[Robert Bradshaw]

On Jan 6, 2008, at 12:08 PM, Lenard Lindstrom wrote:

> This is not as simple as it appears. Pyrex is bases on Python, not  
> C. So
> its grammar should be consistent with Python. In Python, the unary '+'
> can be overridden. So if x where a Python variable then ++x is
> equivalent to +(+x). Now the unary '+' can also be overloaded in C+ 
> +. So
> for future considerations in C++ support shouldn't ++x also  
> translate to
> +(+x) for statically cdef'd variables to be consistent with Python  
> grammar.

Maybe for the future, but for now I certainly think there should be a  
warning.

- Robert


>
>
> Lenard Lindstrom
>
>
> Dan Gindikin wrote:
>> This thought occurred to me, but perhaps there ought to at least  
>> be a warning in
>> this case? It's an easy mistake to make.
>>
>> John Machin wrote:
>>
>>> Dan Gindikin wrote:
>>>
>>>> Hi,
>>>>
>>>> It appears the "++" prefix operator gets silently stripped out.  
>>>> If you
>>>> have the following,
>>>>
>>>>     cdef int x
>>>>     x=0
>>>>     ++x           # in the .c file, this is just "__pyx_v_x"
>>>>     print x
>>>>
>>>> a "0" is printed.
>>>>
>>>> This is with version 0.9.6.4
>>>>
>>>>
>>>>
>>> There is no such thing as a "++" prefix operator in Python and Pyrex
>>> (and Pyrex doesn't support x += 1). You have two "+" prefix  
>>> operators,
>>> with the expected result.
>>>
>>>
>>>
>>
>>
>
>
> _______________________________________________
> Pyrex mailing list
> Pyrex at lists.copyleft.no
> http://lists.copyleft.no/mailman/listinfo/pyrex