I hope I have understood your question correctly. Your basic
problem is that you want to have a default error handler
that can be easily overridden, right?
If so, then the trick we use in my shop works kinda like
this:
package Error;
use var qw/$ERROR_HANDLER/;
@ISA = qw/ EXPORTER /;
@EXPORT_OK = qw/ &Error /;
$ERROR_HANDLER = undef; # Because I need to be sure
sub Error {
if ( defined( $ERROR_HANDLER ) ) {
$ERROR_HANDLER->($@);
}
else {
print STDERR "@_\n";
}
}
The default behaviour is to print a nice message to STDERR.
If somebody sets $ERROR::ERROR_HANDLER to a subroutine
reference, though, that function will be called instead. Yes,
there are a few holes in the code I have presented, but the
idea works ( fixing them has been left as an excercise to
the reader :).
There isn't a lot of magic in CGI.pm. An object is
simply a package, after all. To get the procedural methods
made available, they simply put them in the @EXPORT. CGI.pm
does use its own import method, but those are pretty easy to
write as well. It is also pretty easy to write functions
that can be used as either method calls or as procedural
functions ( simply shift the first element off @_ and
decide if it is an object reference of the correct type
or not ).
mikfire
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