scope question

[Richard Trahan]

Consider the following code:

use strict;
{
my $x = 5;
our $sr = sub { print "$x\n"; };
}
&$sr;

This code gives a scope error, but if I remove 'use strict',
it works ok.

The 'our $sr' statement should make an entry in the SCALAR
slot of *main::sr, right? And the &$sr should retrieve only
that value, right?

What am I missing here?

Thanks.

 

[Tad McClellan]

Consider the following code:

use strict;
{
my $x = 5;
our $sr = sub { print "$x\n"; };
}
&$sr;

This code gives a scope error, but if I remove 'use strict',
it works ok.

The 'our $sr' statement should make an entry in the SCALAR
slot of *main::sr, right?

Right, the value is there.

You are having trouble _accessing_ that value though.

What am I missing here?

All that "our" gets you is to make "use strict" shut up about using
short names rather than long names.

The "permission to use short names" is scoped, once outside that
scope, you must use the fully qualified package name again.

So:

&{$main::sr};
or
$main::sr->();

or, if you want to use the short name after the block, ask for that
with an

our $sr;

after the block.

 

[Joe Smith]

Consider the following code:

use strict;
{
my $x = 5;
our $sr = sub { print "$x\n"; };
}
&$sr;

With 'our', the value is global but the permission to access
it is scoped. It would work if you replace the last line with

{
our $sr;
&$sr;
}

-Joe