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Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

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© 2006-2017 Andrew Cooke (site) / post authors (content).

That Recursive Java Generics Thing....

From: "andrew cooke" <andrew@...>

Date: Tue, 10 Jan 2006 19:06:58 -0300 (CLST)

SelfBounded<T extends SelfBounded<T>>

At last - a clear explanation.  From Bruce Eckel, at Artima.

http://www.artima.com/weblogs/viewpost.jsp?thread=136394
http://www.artima.com/forums/flat.jsp?forum=106&thread=136394
(second link includes comments)

Comments:

It's the ability to specify "this argument should be 'just like me', even
after subclassing", that is only expressible by self-bounded generics.
[...]
A self-bounded type is not a self-type. It's a common misconception that
self-bounded types are equivalent to self-types. See the "Generics and
covariant return types" post# 8 for example of this.

A self-bounded type cannot guarantee that the argument will be the same
type as this after subclassing. There is no equivalent to self-types in
Java generics.
[...]
self-bounding types are to enable covariant argument types.

And a link to explain that -
http://en.wikipedia.org/wiki/Covariance_and_contravariance_(computer_science)

Andrew

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