On 12/18/05, Rhesa Rozendaal <[EMAIL PROTECTED]> wrote:
> use base qw/MyApp::Base/;
> or
> our @ISA = qw/MyApp::Base/;
>
> is functionally equivalent. I personally prefer the former, since it reads
> better.
Although they are very similar, there is a minor difference that can
be important in some instances. use base takes effect at compile
time, whereas @ISA takes place at run time. To make them equivalent,
you need to put the @ISA statement in a BEGIN {} block.
BEGIN { our @ISA = qw/MyApp::Base/ };
One place where this difference can bite you is loading a plugin (or
module) that does some work during the 'import' stage. For example
when you use the CAP::TT plugin, it checks to see if the module is a
CGI::Application subclass, and if it is, it registers some new hooks.
If you use @ISA but don't put it in a BEGIN block, then this will
fail, and the hooks will not be setup for you.
This is why I always use base instead of @ISA.
Cheers,
Cees
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