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Constructing instances of value-bound classes [message #567176]

Sat, 09 January 2010 18:16

Eugene Hutorny

Messages: 110
Registered: January 2010

Senior Member

I have the following class:

public class Person<Gender gender> {
enum Gender { Male, Female }
public Person(String name) {
super();
this.name = name;
}
protected final String name;
}

How can I create an instance of person? :)

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Re: Constructing instances of value-bound classes [message #567195 is a reply to message #567176]

Sun, 10 January 2010 13:16

Stephan Herrmann

Messages: 1843
Registered: July 2009

Senior Member

Eugene Hutorny wrote on Sat, 09 January 2010 13:16
> I have the following class:
>
> public class Person<Gender gender> {
> enum Gender { Male, Female }
> public Person(String name) {
> super();
> this.name = name;
> }
> protected final String name;
> }
>
>
> How can I create an instance of person? :)

Theory says:

Person<@Gender.Female> woman = new Person<@Gender.Female>("Lisa");

Practice says:
The above generates illegal byte code
(see https://trac.objectteams.org/ot/ticket/332)

What does it tell us?
Value-dependent types are not widely used and tested as of yet.

But:
A solution for Ticket 332 is on its way.

best,
Stephan

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Re: Constructing instances of value-bound classes [message #567214 is a reply to message #567195]

Mon, 11 January 2010 11:44

Eugene Hutorny

Messages: 110
Registered: January 2010

Senior Member

Thanks for the clarification.
Another related question - from the documentation I got impression that the generic's wildcards can be used for the value bound types, something like:

Person<?> woman = new Person<@Gender.Female>("Lisa");

but I did not succeed with this. Is this feature supported?

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Re: Constructing instances of value-bound classes [message #567271 is a reply to message #567214]

Mon, 11 January 2010 14:09

Stephan Herrmann

Messages: 1843
Registered: July 2009

Senior Member

Eugene Hutorny wrote:
> Another related question - from the documentation I got impression that
> the generic's wildcards can be used for the value bound types, something
> like:
>
> Person<?> woman = new Person<@Gender.Female>("Lisa");
>
> but I did not succeed with this. Is this feature supported?

Sorry, no. Currently, the "?" is only used in the standard Java way
to denote an unknown type, not an unknown value.

Stephan

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