IF clauses inside definitions

[robertwb]

Normally, IF only works in the global scope.
Defining conditional members of a struct necessitates redefining the whole structure:

IF UNAME_SYSNAME == "Windows":
      ctypedef struct ohmygod:
            int common
            int greece
ELSE:
      ctypedef struct ohmygod:
            int common
            float pelvis

This would be more convenient, especially for big structures:

ctypedef struct ohmygod:
     int common
     IF UNAME_SYSNAME == "Windows":
                 int greece
     ELSE:
                 float pelvis

Migrated from http://trac.cython.org/ticket/16

[robertwb]

@robertwb changed milestone to wishlist
commented

[robertwb]

@robertwb commented

These macros are not a pre-parser as in C, and so to do this one would have to do a bit of trickery...

[robertwb]

@dagss commented

I vote for resolving this as invalid; as discussed on the mailing list (sometimes August 2008) the efforts in this direction might be better concentrated on integrating other preprocessing languages with Cython instead (and slowly deprecating the IF statement altogether).

[maxbachmann]

@scoder given the deprecation in #4310 this can probably be closed

[da-woods]

Yeah I think we're agreed that we aren't planning to do this thanks