[Python-Dev] _PyString_InsertThousandsGrouping()

[Eli Bendersky]

On Wed, May 22, 2013 at 9:18 PM, Carlos Nepomuceno <
carlosnepomuceno at outlook.com> wrote:

> ________________________________
> > From: eliben at gmail.com
> [...]
> > I've found the following declaration in 'Objects/stringobject.c' but it
> > just defines _Py_InsertThousandsGrouping() as
> > _PyString_InsertThousandsGrouping():
> >
> > "#define _Py_InsertThousandsGrouping _PyString_InsertThousandsGrouping"
> >
> > I'm looking for the opposite!
> >
> > No, you aren't :-)
> >
> > #define _Py_InsertThousandsGrouping _PyString_InsertThousandsGrouping
> > #include "stringlib/localeutil.h"
> >
> > Now look inside "stringlib/localeutil.h" and think what the
> > pre-processor does with the function definition having the #define
> > above.
> >
> > Eli
>
> lol I can see clearly now! :p
>
> That reminds me of "Which came first, the chicken or the egg?"
>
> Thank you! Somehow I got intrigued by such use...
>
> Do you know why they've put a lot of source code inside the header files?
> _______________________________________________
>
>
This depends per use-case. Commonly, code is placed in header files in C to
achieve some sort of C++-template-like behavior with the preprocessor. In
particular, I think Objects/stringlib/formatter.h  does this. Note this
comment near its top:

/* Before including this, you must include either:
   stringlib/unicodedefs.h
   stringlib/stringdefs.h

   Also, you should define the names:
   FORMAT_STRING
   FORMAT_LONG
   FORMAT_FLOAT
   FORMAT_COMPLEX
   to be whatever you want the public names of these functions to
   be.  These are the only non-static functions defined here.
*/

Eli
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