Anonymous sub

[Tve]

I'm trying to compute a value and return it to a scalar. want to do this through an anonymous sub, but I can't figure out the syntax. I basically have something like

$val = sub { return 2 };

I'm creating a reference to the sub, but I would actualy like to get the value 2 in $val.

Must sound simple, but I've never worked with anonymous subdbs before....

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Thierry

 

[rharsh]

Will this work out for you?

my $subref = sub {return 2;};
my $val = &{$subref};
print $val;

 

[Coderifous]

Your problem sounds artificial... is this homework? Is this just for the sake of learning and tinkering?

There are a ton of other ways to compute a value, why do you HAVE to use an anonymous subroutine?

--jim

 

[Tve]

Could work, but I actually need the answer several times, which implies that the sub would also be called several times instead of once.

I had actually figured out this solution ( and currently using it) , but there must be a better way....

Thanks


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Thierry

 

[nawlej]

So put it inside of a loop......why dont you post your solution so we can help you further......

 

[Tve]

jim,

I suppose you're right. But I get these kind of idees and it just keeps my mind going until I find a solution (or get some help of course).

I suppose I would be better of with a beer.



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Thierry

 

[Tve]

Jim,

I did want to come back on a point....

You mention that there are tons of ways to compute values...of course. Maybe this is just the way I program, but I often end up with a complete set of small subs. I generally end up making small subs that are only called up once just for clarity, to avoid polluting my main code with all kind of loops and conditionnals. Most of all, I also like to use subs to scope my variables and make sure I don't have to maintain to many of them in the main program.

I suppose this is why I was looking at anonymous subs. I kept looking and I could use the eval function, but I thought I read one that eval have a pretty big impact on performance.

Any thoughts?





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Thierry

 

[rharsh]

Thierry,

I don't think that Jim was saying that there is anything wrong with using subs, but, as he said, Why do you have to use an anonymous sub?

Why not just a normal sub, like I'm guessing you have through the rest of your code? I think the question was something like: what's the motivation for using an anonymous sub?

 

[Tve]

This is all very theoretical of course...

I suppose it's just to make the overall code clearer...
When you end up with tens of subs, it just makes it harder to keep an overview of the program flow.

Anyway, like Jim said, it's mostly "just for the sake of learning and tinkering".



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Thierry

 

[uida1154]

I have find the solution:

sub anonimous()
{
 print "007\n";
}

 

[uida1154]

typo...

sub anonymous()
{
 print "007\n";
}

 

[mikevh]

Unless that's a joke, I think you need to look up the definition of the word "anonymous".