Front page | perl.perl5.porters |
Postings from June 2022
Op 11-06-2022 om 10:37 schreef Neil Bowers:
> > Can someone show an example, ideally on CPAN, where this gets used?
>
> I _think_ you were asking for an example of someone using the return
> value from a require. In which case:
>
> https://grep.metacpan.org/search?qci=&q=%3D%20require&qft=&qd=Acme-MetaSyntactic-Themes&f=lib%2FAcme%2FMetaSyntactic%2Funicode.pm
> <https://grep.metacpan.org/search?qci=&q=%3D%20require&qft=&qd=Acme-MetaSyntactic-Themes&f=lib%2FAcme%2FMetaSyntactic%2Funicode.pm>
>
> This is in BooK’s Acme::MetaSyntactic::unicode module (yeah, Acme):
>
> if ( $] >= 5.006 && $] < 5.007003 ) {
> eval { $data = require 'unicode/Name.pl'; };
> }
> elsif ( $] >= 5.007003 ) {
> eval { $data = require 'unicore/Name.pl'; };
>
> # since v5.11.3, unicore/Name.pl creates subroutines
> # they end up in our namespace, so get rid of them
> undef *code_point_to_name_special;
> undef *name_to_code_point_special;
> }
>
> Guessing there may be other examples on CPAN – this is just the first
> one I found with grep.metacpan.org.
>
I'm not sure if that is what Neil ment, because is this really supposed
to work? The documentation for require says nothing about it returning a
value. I would say that if this works it is accidental.
I think that Neil ment an example of where not returning a true value
from a module is used for some decission making (using try/eval) instead
of aborting compilation.
M4
Thread Previous
|
Thread Next