Re: A general method of locally overriding subroutines

Are the functions to be overridden all in the same package? ~~If they are, you can do the localisation with a single hash slice:~~

  sub localise_and_call {
    my($fn, @args) = @_;
    my $stash = \%::;  # assuming main package
# I forgot the local here
    @$stash{@args} = (sub { "changed" }) x @args;
    $fn->(@args);
  }
[download]

Update: oops, doesn't work when I add the "local" where it's supposed to go. I'm not sure why not though, maybe a bug.

Update: now reported as bug #38710.

Hugo

Comment on Re: A general method of locally overriding subroutines Download Code

Replies are listed 'Best First'.
Re^2: A general method of locally overriding subroutines by tmoertel (Chaplain) on Mar 11, 2006 at 16:56 UTC
I had tried the hash-slice method earlier, but it did not work when `local`-ized: `sub localize_and_call_fn { my ($locals, $fn, @args) = @_; local @::{@$locals} = (sub {"changed"}) x @$locals; $fn->(@args); }` [download] I figured I was doing something wrong, but I couldn't figure out where exactly the train had left the rails. Thanks for putting more light on the subject. Cheers, Tom Tom Moertel : Blog / Talks / CPAN / LectroTest / PXSL / Coffee / Movie Rating Decoder	[reply] [d/l]
Re^2: A general method of locally overriding subroutines by hv (Prior) on Mar 20, 2006 at 10:59 UTC
Update: this bug has now been fixed for perl-5.10 (change #27547), and I think it is likely the fix will make it into one of the next maintenance releases (5.8.9 or 5.8.10) as well. So you will be able to write: `sub localise_and_call { my($fn, @args) = @_; my $stash = \%::; # assuming main package local @$stash{@args} = (sub { "changed" }) x @args; $fn->(@args); }` [download] Hugo	[reply] [d/l]