Re: New way to do XS constants

[Graham Barr <gbarr@pobox.com>]

On Fri, Jan 07, 2000 at 09:58:56AM +0000, Tim Bunce wrote:
> FYI: All those advantages also apply to this very simple method:
> 
>   I32
>   constant()
>         PROTOTYPE:
>     ALIAS:
>         CONST_NAME_1 = 1
>         CONST_NAME_2 = 2
>         CONST_NAME_3 = 3
>         CONST_NAME_4 = 4
>     CODE:
>     RETVAL = ix;
>     OUTPUT:
>     RETVAL
> 
> (The 1, 2, 3, 4 can be #defined values.)
> 
> Using a single XS sub and multiple XS aliases instead of multiple perl
> subs uses very little memory (far less than multiple perl subs).
> It also has a very low start-up overhead (just one newXS() call each).

But this does not create a constant sub. It also does not allow you use
#ifdef for the constants.

Take a look at the end of IO.xs

Graham.

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Follow-Ups from:

Tim Bunce <Tim.Bunce@ig.co.uk>

References to:

Tye McQueen <tye@metronet.com>
Tim Bunce <Tim.Bunce@ig.co.uk>

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