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Re: Re: Re: Re (tilly) 1: Strict, strings and subroutines

by $code or die (Deacon)
on Oct 10, 2001 at 22:03 UTC ( #118075=note: print w/replies, xml ) Need Help??


in reply to Re: Re: Re (tilly) 1: Strict, strings and subroutines
in thread Strict, strings and subroutines

Changing @ISA at runtime is not always a good thing to do. If your application does use a lot of objects and method calls it will cause the method lookup cache to be cleared
That's the beauty of local isn't it?

Simon Flack ($code or die)
$,=reverse'"ro_';s,$,\$,;s,$,lc ref sub{},e;$,
=~y'_"' ';eval"die";print $_,lc substr$@,0,3;
  • Comment on Re: Re: Re: Re (tilly) 1: Strict, strings and subroutines

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Re (tilly) 5: Strict, strings and subroutines
by tilly (Archbishop) on Oct 10, 2001 at 22:22 UTC
    What good does that do?

    Graham's point is that when you start dynamically changing inheritance, Perl throws away its memoized method lookup results. Even if you change the inheritance right back, your cache is still gone and it has to work out results again the long way.

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[Lady_Aleena]: Why does grep(/.*$in.*/, @my_modules) work but grep { $_ =~ /.*$in.*/; $_ } @my_modules not work? What did I do wrong in the second?
[tobyink]: Why are you returning $_ n your grep block? You should return a boolean.
[tobyink]: *in your grep block
[tobyink]: You can use grep { $_ =~ /.*$in.*/; } @my_modules but why not stick to grep(/.*$in.*/, @my_modules)? (The latter is faster.)
[shmem]: Lady_Aleena, in the first example grep evaluates the result from grep and if true, returns $_. In the second, it always returns $_
[shmem]: ..the result from the pattern match

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