Re: Defining a parameterized subtype

Guillaume,

Take a look at how the Maybe[`a] type is implemented (on line 615 of  
Moose::Util::TypeConstraints) and use that as a guide.

Currently there is no clean, or easy way to do this though, you are  
stepping into new territory.

- Stevan

On Jul 14, 2008, at 5:16 PM, Guillaume Rousse wrote:
> Hello list.
>
> I'd like to define my own parameterized ClassName subtype, to  
> enforce inheritance from a given class. Something more generic than
>
> subtype 'FooClassName'
>     => as 'ClassName'
>     => where { $_->isa('Foo') };
>
> subtype 'BarClassName'
>     => as 'ClassName'
>     => where { $_->isa('Bar') };
>
> etc...
>
> I found a 'add_parameterizable_type' method in  
> Moose::Util::TypeConstraints, but not much details about to  
> retrieve the parameter in the constraint clause.
> -- 
> Guillaume Rousse
> Moyens Informatiques - INRIA Futurs
> Tel: 01 69 35 69 62

• Defining a parameterized subtype by Guillaume Rousse
• Re: Defining a parameterized subtype by Stevan Little