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compilation problems with a generic callin binding [message #506149]

Wed, 06 January 2010 11:10

Eugene Hutorny

Messages: 110
Registered: January 2010

Senior Member

Method designator binds to a method returning T whereas return type T is specified (OTJLD 4.1(c))

			<T extends Specializable> T castAs(Class<T> type) <- replace T castAs(Class<T> type);
			callin <T extends Specializable> T castAs(Class<T> type) {
				return Education.this.castAs(type);
			}

Two other variations with the generic also fail to compile.
Complete sources to reproduce the problem can be found on this link

Other compilation errors:
The return type of implicitly inherited method Education.Specialist.castAs() is not compatible to the return type of explicitly inherited method Education.Specialist.castAs() (1.3.1(k)).
sources

Internal compiler error: java.lang.NullPointerException at org.objectteams.otdt.core.internal.compiler.mappings.CallinI mplementor.createWrapperMethod(CallinImplementor.java:274)
sources

[Updated on: Wed, 06 January 2010 07:28]

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Re: compilation problems with a generic callin binding [message #506222 is a reply to message #506149]

Wed, 06 January 2010 15:22

Stephan Herrmann

Messages: 1843
Registered: July 2009

Senior Member

> Method designator binds to a method returning T whereas return type T is
> specified (OTJLD 4.1(c))
>
> <T extends Specializable> T castAs(Class<T> type) <- replace T
> castAs(Class<T> type); callin <T extends Specializable> T castAs(Class<T>
> type) { return Education.this.castAs(type);
> }
>
>
> Two other variations with the generic also fail to compile.
> Complete sources to reproduce the problem can be found on this
> http://hutorny.in.ua/wp-content/uploads/2010/01/exer4.zip

Thanks for the example. These are in fact variations of an
existing ticket:
https://trac.objectteams.org/ot/ticket/292

In fact, also the "base-call impossible" problem you reported
earlier seems to have the same root cause.

I've scheduled the ticket for the next milestone.

best,
Stephan

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