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Re: Argument list item alias-ing

by Ido (Hermit)
on Apr 16, 2003 at 11:11 UTC ( [id://250838]=note: print w/replies, xml ) Need Help??


in reply to Argument list item alias-ing

Oooops. Wrong subname..Sorry about that... Anyway, here(ActivePerl 5.8.0, Build 805), neither: 
sub subname{
local *_=\$_[0];
s///;
}
subname("String");

[download]
Gives any error message. So..is it a bug?A feature?Another stupid mistake of myself?

Replies are listed 'Best First'.
Re: Re: Argument list item alias-ing
by broquaint (Abbot) on Apr 16, 2003 at 13:40 UTC
    Sounds like a bug to me as I get an error message here 
    sub subname {
  local *_=\$_[0];
  s///;
}
subname("String");

Modification of a read-only value attempted at - line 3.

    [download]
    This error should occurs because you're 'aliasing' $_ to $_[0], which essentially equates to both pointing to the same scalar value e.g 
    sub {
  print "\$_[0]: ",\$_[0], $/;
  local *_= \$_[0];
  print "\$_:    ",*main::_{SCALAR}, $/;
  s///;
}->("foo");

__output__

$_[0]: SCALAR(0x8107ec8)
$_:    SCALAR(0x8107ec8)
Modification of a read-only value attempted at - line 5.

    [download]

    HTH

    _________
    broquaint

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