Re: access to my variables from other subs

Okay Adam... use strict is in place. Here is another example of the problem:

use strict; 
my $evaled = 0; 
 
# very simplified... 
sub makesub { 
  my($name) = @_; 
  return "sub $name { print \"\$var \"; }"; 
} 
 
sub a { 
  my($var) = @_; 
  if(!$evaled) { 
    eval(makesub("somesub")); 
    $evaled=1; 
  } 
} 
 
a("what"); 
somesub(); 
a("the"); 
somesub();
[download]

prints:
what what

I'd like it to print "what the". Basically I don't want to have to eval every single time, it could be in the millions... but I'd still like access to the my variables of the sub that it was first created in. I don't even mind if I have to call the sub from the one that encloses it. i.e:

sub a { 
  my($var) = @_; 
  if(!$evaled) { 
    eval(makesub("somesub")); 
    $evaled=1; 
  } 
  somesub();  # only place I call it from.
              # only want to eval once per
              # program execution, but have 
              # access to the my variables for
              # each calling of "a"
}
[download]

Perhaps it's impossible.

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RE: Re: access to my variables from other subs by Adam (Vicar) on Oct 21, 2000 at 05:02 UTC
`#!perl -w use strict; # ALWAYS! a("what"); somesub(); a("the"); somesub(); { my $var; # shared only between a() and somesub() sub a { $var = shift } sub somesub { print $var, $/ } } # proof that $var is scoped correctly: my $var = 'global'; print $var, $/; somesub(); print $var, $/;` [download] I should point out that ALL named subroutines are global to the package in which they are named. Thus declaring a named subroutine inside another routine does not do what you want. Anonymous subroutines, on the other hand, are scoped locally (for relatively obvious reasons). Of course, the routine can only see variables that are in the scope where the routine was declared... Update: I'm looking at this, and it doesn't look like your original question. It seems you wanted named routines that came from the same code but did different stuff based on some third party manipulator function... let me think on that.	[reply] [d/l]
RE: RE: Re: access to my variables from other subs by Adam (Vicar) on Oct 21, 2000 at 05:16 UTC
Okay, here you go: `#!perl -w use strict; # ALWAYS! a("what"); b("the"); { use vars ('$var'); local $var; # shared only between a() and somesub() sub a { local $var = shift; _somesub() } sub b { local $var = shift; _somesub() } # sub routines with a leading _ usually denotes a private func. sub _somesub { print $var, $/ } }` [download]	[reply] [d/l]