Front page | perl.perl5.porters |
Postings from June 2009
Quoth pjf@perltraining.com.au (Paul Fenwick):
>
> Autodie can tell when an overriden readline has been called, since it uses
> the replacement code. It could use Want (or similar) to check to see if
> that's being called in a pure boolean context, since:
>
> use autodie; while (<>) { ... }
>
> becomes:
>
> while (&readline(STDIN)) { ... }
>
> If it's being called in a pure boolean context, then I have a candidate for
> magical $_ setting. The real test then is whether we're in a while loop by
> ourselves. Then I only need to worry about what happens if the caller is
> using a lexical $_, and add some caching so we don't need to repeat the
> whole check for every call to readline().
>
> Is there really really no way of testing if we're being called as the sole
> argument to while?
Yes, but not from pure-Perl, since not even B provides access to the
context stack. From XS it's relatively easy.
Ben
Thread Previous
|
Thread Next