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On 11/21/2003 4:03 PM, Nick Ing-Simmons wrote:
> Nick Ing-Simmons <nick DOT ing-simmons AT elixent DOT com> writes:
>
>>>>package MyModule;
>>>>use Module;
>>>>use base 'Module';
>>>>use Cwd;
>>
>>If you moved that above the use Module line then when Module.pm
>>was compiled it would know Cwd::cwd was a function.
>
>
> Sorry I could not see wood for the trees!
>
> What is happening is that in MyModule you 'use Cwd',
> which EXPORTS 'cwd' by default - so now there is a MyModule::cwd
> which is a legitimate over-ride of base class's version so...
>
> You call MyModule->new which inherits from Module->new - so far so good.
> But then Module::new calls MyModule->cwd which is the imported one.
> So fix is:
>
> package MyModule;
> use Module;
> use base 'Module';
> use Cwd (); # No imports!
>
> Alternatively Module's new could do
>
> sub new {
> my $p = shift;
> Module->cwd; # ignore override by derived class.
> }
>
> But that rather spoils it as a base class.
>
Ok, both of these work. I see now where I was flawed in understanding
this one.
Many thanks to Nick, Adi, and Yitzchak (May I ask how to pronounce your
name?) for the explanations and solutions.
BTW, strictly speaknig, wouldn't this still be considered a bug, since
the behaviour difers depending on platform.
--
A little learning is a dang'rous thing;
Drink deep, or taste not the Pierian spring;
There shallow draughts intoxicate the brain;
And drinking largely sobers us again.
- Alexander Pope
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