> -----Original Message-----
> From: Olivier Wirz [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 6:02 PM
> To: [EMAIL PROTECTED]
> Subject: Dynamic load of a Perl class
>
>
> Hello,
>
> Ich would like to load dynamically a Perl class (late binding).
>
> For example, if I start a Perl script with a command line
> parameter like --sport=SWIMMING, I would like to have
> something like that (after having saved SWIMMING via
> $opt_sport in variable $aSport):
>
> my $aSport = $opt_sport;
> use Classes::$aSport; <----- doesn't work !
>
It's possible (see perldoc -f require) like this:
eval "require Classes::$aSport";
if($@){
die $@;
}
But i'm personally avoid using this solution because of following reasons:
* errors inside Classes::$aSport appear at run time not at compile time.
If your script takes a longtime before executing the line eval "require
Classes::$aSport";
Debugging becomes painful (I know what i'm saying :).
* since the syntax is eval "" and not eval {}, this line will be re-compiled.
So if you put the eval "" inside a loop, there will be a re-compilation for each
iteration => Not elegant !
Alternatively, why not just write *all* possible cases:
use Classes::aSport
use Classes::Foo
use Classes::Bar
use Classes::BlaBla
On other hand there should be an implementation of your Classes::XYZ, so you should
know in advance which class can be use.
The list can be huge but you will gain in term of maintenance.
HTH,
José.
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