Re^2: Invoking a string reference to a anonymous subroutine

[Superfox il Volpone]

Hi there,
thanks for your replies.

I have tried the third approach by Lanx, but the program returns the following error:

Variable "$_parse_element_configuration" is not available at (eval 8) 
+line 2.
Use of uninitialized value in subroutine entry at Configuration.pm lin
+e 64.

My code is :

my $_parse_element_configuration = sub{ ... }

sub _handler{
  my $function_name = shift;
  eval "\$$function_name";
};

[...]

# invoking the handler
_handler("_parse_element_configuration")->($self, $element);

Where is the problem?

Kind regards,
s.fox

p.s. my Perl version is 5.10, could it be involved?

[LanX]

> Where is the problem?

My code worked and the code you are showing now will also work.

But maybe you should care to define _handler within the scope of your private $_parse... variables to have a proper closure?

Otherwise Variable "$_parse_element_configuration" is not available at (eval 8) line 2."

[Superfox il Volpone]

Hi Rolf,

thanks for your reply.

But maybe you should care to define _handler within the scope of your private $_parse... variables to have a proper closure?
I believe you are right. I have come up with the following code:

my $_parse_handler = sub {
  my $self = shift;
  my $function = shift . '0';
  
  # installed handlers
  my $_parse_element_configuration0 = $_parse_element_configuration;
  my $_parse_element_machines0 = $_parse_element_machines;
  
  eval "\$$function";
};

[...]

my $handler = $self->$_parse_handler("_parse_element_" . $element->nam
+e() );
$self->$handler($element);

Anyway I am getting the impression I am trying to bend the language to something it was not designed to do.

Kind regards,
s.fox

[LanX]

Ugh... :-|

Look now this really doesn't make much sense anymore.

I was under the impression that you also need to call the handlers manually as private methods??? (they are now restricted to the sub)

If not _please_ use dispatch tables!

update

older discussions covering dispatch tables (google ranked)