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Re: Re: OOP: Plugin Style Development

by dragonchild (Archbishop)
on Jul 22, 2002 at 21:19 UTC ( #184240=note: print w/ replies, xml ) Need Help??


in reply to Re: OOP: Plugin Style Development
in thread OOP: Plugin Style Development

That is what he's doing. We're discussing how to implement the Helper pattern. :-)

------
We are the carpenters and bricklayers of the Information Age.

Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.

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Re: Re: Re: OOP: Plugin Style Development
by Jenda (Abbot) on Jul 23, 2002 at 19:21 UTC

    I'm not 100% it IS what is he doing. It doesn't hurt to explain it in more detail for others even if he does.

    Anyway here's some code that implements the method checking:

    # in package ShoppingCart @required_methods = qw(GetNext GetFirst Reset ...); sub initialize { my $self = shift; my $IO = shift; croak "The first parameter to 'new ShoppingCart' must be an IO objec +t!" unless ref $IO; foreach my $method (@required_methods) { croak("The IO object passed to 'new ShoppingCart' does not impleme +nt the necessary methods!") unless $IO->can($method); } $self->{IO} = $IO; } ...

    The test is not compile time, but currently it's the best you can get. AFAIK of course.

      Jenda

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