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In C/C++, I believe this problem would be solved like this:<br>
<br>
<b>**matrix.h**</b><br>
#ifndef MATRIX_H<br>
#define MATRIX_H<br>
<br>
/* declarations here */<br>
#endif<br>
<br>
<b>**matrix.c**</b><br>
#include "matrix.h"<br>
<br>
/* implementation here */<br>
<br>
Is there an equivalent to #ifndef in Pyrex? Or is there any other
solution to my problem?<br>
<blockquote cite="mid4488E7F3.4030903@wi.rr.com" type="cite">
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I'm building a little math library in Pyrex, and I'm having trouble
with some circular cimports. I'll post short excerpts from my various
files, then show the error that I'm getting when I try to use one of
the modules.<br>
<br>
<b>**matrix.pxd**<br>
</b>cdef class Matrix:<br>
cdef float m[4][4]<br>
<br>
<b>**matrix.pyx**<br>
</b>cimport vector<br>
<br>
cdef class Matrix:<br>
### a bunch of methods, including ones that create or manipulate
Vector objects ###<br>
<br>
<b>**vector.pxd**<br>
</b>cdef class Vector:<br>
cdef float x, y, z, w<br>
<br>
<b>**vector.pyx**</b><br>
cimport matrix<br>
<br>
cdef class Vector:<br>
### a bunch of methods, including one that has a Matrix argument ###<br>
<br>
After building the Pyrex modules into .pyd files, I run a test module.
The first line imports the matrix module and throws this error:<br>
<br>
Traceback (most recent call last):<br>
File "C:\Development\SFStratPrototype\math3d\matrixTest.py", line 1,
in ?<br>
import matrix<br>
File "vector.pxd", line 1, in matrix<br>
cdef class Vector:<br>
File "matrix.pxd", line 1, in vector<br>
cdef class Matrix:<br>
AttributeError: 'module' object has no attribute 'Matrix'<br>
Press any key to continue . . .<br>
<br>
It doesn't seem to like how the modules cimport each other. I can't
see any way to eliminate this circular reference, so what can I do to
fix this error?<br>
<br>
- Mike Wyatt<br>
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