Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW
 
PerlMonks  

Re^2: elsif chain vs. dispatch

by sflitman (Hermit)
on Apr 26, 2009 at 23:50 UTC ( #760224=note: print w/ replies, xml ) Need Help??


in reply to Re: elsif chain vs. dispatch
in thread elsif chain vs. dispatch

For me, it is that the codebase is becoming unwieldy, so I wanted to switch to the dispatch style, and I was (honest) going to be putting it outside a sub so it only gets compiled once!

Have you ever considered using the symbol table as the hash, would this be any good:

$::{"handle_fieldcode_$code"}->($args); # for $code = 'A'..'Z'
??
SSF


Comment on Re^2: elsif chain vs. dispatch
Download Code
Re^3: elsif chain vs. dispatch
by ikegami (Pope) on Apr 27, 2009 at 02:57 UTC

    The slow bit is the function call, not the hash lookup which you'd also have to do with the symtab anyway. With a hash, you have better control over what inputs are allowed and how they are dispatched.

    With symtab:

    my $handler = do { no strict 'refs'; \&{"handle_fieldcode_$code"} }; ...handle expections somehow?... die if !$handler; $handler->(@args);

    With hash;

    my $handler = $lookup{$code}; die if !$handler; $handler->(@args);

    with a one-time setup of

    my %lookup = map { no warnings 'refs'; $_ => \&{"handle_fieldcode_$_"} } 'A'..'Z'; ...modify %lookup for expections...

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://760224]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others imbibing at the Monastery: (13)
As of 2015-07-06 18:52 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (80 votes), past polls