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

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.
[download]

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);
[download]

Where is the problem?

Kind regards,
s.fox

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

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Re^3: Invoking a string reference to a anonymous subroutine by LanX (Saint) on Jan 15, 2014 at 11:24 UTC
> 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."` Cheers Rolf ( addicted to the Perl Programming Language)	[reply] [d/l] [select]
Re^4: Invoking a string reference to a anonymous subroutine by Superfox il Volpone (Sexton) on Jan 15, 2014 at 12:48 UTC
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);` [download] 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	[reply] [d/l]
Re^5: Invoking a string reference to a anonymous subroutine by LanX (Saint) on Jan 15, 2014 at 13:26 UTC
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! Cheers Rolf ( addicted to the Perl Programming Language) update older discussions covering dispatch tables (google ranked)	[reply]

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