[Pyrex] sizeof operator problem

[Robert Bradshaw]

This is because Pyrex resolves sizeof(type) vs. sizeof(var) at  
parsing, rather than at a later stage of the algorithm when spam.spam  
can actually be analyzed. Cython resolves this by revisiting this  
decision at the analyse_types phase, so dotted names as variables and  
types can both be handled correctly.

- Robert

On Dec 30, 2008, at 12:36 AM, Daniele Pianu wrote:

> Excuse me for the wrong error message specified in the mail sent.
> Compile the egg.pyx source of the previous mail with the pyrexc
> compiler raises this error:
>
> [daniele at tharros sizeofTest]$ pyrexc egg.pyx
> /home/daniele/Projects/Pyrex/sizeofTest/egg.pyx:4:21: 'spam' is not a
> constant, variable or function identifier
>
> Any idea?
> Daniele.
>
> 2008/12/29 Daniele Pianu <muogoro at gmail.com>:
>> I'm using the sizeof C operator to obtain the size of this spam  
>> structure:
>>
>> cdef struct spam:
>>  int foo
>>  int bar
>>
>> The spam structure is declared in the spam.pxd source. The egg
>> extention type, defined in the egg.pyx source, imports the spam's
>> definition and trys to print the spam structure size:
>>
>> cimport spam
>> cdef class egg:
>>  def __init__( self ):
>>    print sizeof(spam.spam)
>>
>> The compilation of the egg.pyx source raises this error:
>>
>> [daniele at tharros 0.0.9]$ pyrexc tmp/PyArrayF32.pyx
>> /home/daniele/Projects/Python/PyBBDMMaker/0.0.9/tmp/PyArrayF32.pyx: 
>> 9:64:
>> 'ArrayF32' is not a constant, variable or function identifier
>>
>> I've read here http://thread.gmane.org/gmane.comp.python.pyrex/ 
>> 2340/focus=2341
>> that a from-cimport statment solves the problem, but I'm using the
>> sizeof operator in the way described above in my sources, where the C
>> structure and the extension type which wraps the structure have the
>> same name (that is, for a Foo structure, a C_Foo.pxd source contains
>> the structure-extern definition and a PyFoo.pxd defines the  
>> wrapper. I
>> refer to the structure in the Foo extension type as C_Foo.Foo and I
>> pass the same name to the sizeof operator). Now the question: is  
>> there
>> a solution different from the from-cimport statement suggested in the
>> linked post?
>>
>> Thanks for your help,
>> Daniele
>>
>
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