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Re^2: (nearly) readonly globals

by haoess (Curate)
on Jan 19, 2009 at 20:32 UTC ( [id://737395]=note: print w/replies, xml ) Need Help??


in reply to Re: (nearly) readonly globals
in thread (nearly) readonly globals

Using local creates a temporary instance of the named variable, and you can do what you like with it.

But this does not apply to all special globals, i.e.:

% perl -e 'local $1 = 1'
Modification of a read-only value attempted at -e line 1.

% perl -e 'local $^S = 1'
Modification of a read-only value attempted at -e line 1.

[download]

-- Frank

Replies are listed 'Best First'.
Re^3: (nearly) readonly globals
by Corion (Patriarch) on Jan 19, 2009 at 20:35 UTC
[reply]

      I don't give up:

      % bleadperl -Mstrict -wE 'for $1 ( 10..13 ) { say $1 }'
10
11
12
13

      [download]

      And now, these globals loose their magic:

      % bleadperl -Mstrict -wE 'for $1 ( 10..13 ) { $1 =~ /^(\d)/; say $1 }'
10
11
12
13

      [download]

      -- Frank

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