Re^2: (nearly) readonly globals

[haoess]

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.

-- Frank

[Corion]

Yes - see local, resp. the documentation referenced by it, Private Variables via my() in perlsub.

[haoess]

I don't give up:

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

And now, these globals loose their magic:

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

-- Frank