in this example
sub a { state $x ; my $y ; my sub b { ... } ;
...
}
how "my sub b" is different from "state $x" from the point of view of
scope ?
Actually, all three have the same scope, but they have different lifetime.
Each invocation of sub a has fresh $y and &b variables, but keeps the same $x every time.
A nice example is:
sub a {
state $x;
my $y;
my sub b { return $x++ + $y++; }
return &b; # is a \ before &b needed?
}Every call to sub a will return a different closure. The $x in each closure all refer to the same variable. Each closure's $y however is different and independent.
-- Matthijs van Duin -- May the Forth be with you!
