from http://www.greglondon.com/iperl/html/iperl.html#9_The_use_Statement_Formally
The "use" statement can be formally defined as this:
use MODULENAME ( LISTOFARGS );
The "use" statement is exactly equivalent to this:
BEGIN
{
require MODULENAME;
MODULENAME->import( LISTOFARGS );
}
So, functionally, the difference is your :one_piece is
part of LISTOFARGS that then gets passed to the
import method if an import method is defined
and this will cause additional behaviour to occur
based on :one_piece.
This allows all users of a module to get a default
behaviour, plus any additional behaviour that is
caused by the import method and any arguments passed
into the 'use' statement.
I think you can avoid duplicating code this way
because you don't have to have
Module::First
Module::Second
Module::Third
instead you can have Module and pass in First,Second,
and/or Third when you use Module.
Timothy Kohl said:
> This is almost certainly RTFM but
> what is the rationale behind
> something like this.
>
> use Blah qw(:one_piece);
>
> for example
>
> use CGI qw(:cgi-lib)
>
> I realize this is for grabbing a portion of a larger .pm
> file, but how does it differ from say
>
> use LWP::Simple;
>
> Inquiring mind(s) would like to know.
>
> -T
>
>
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"Impatient Perl"
A GNU-FDL training manual for the hyperactive.
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