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Re: case-lambda and Java
On 12/07/2009 03:48 PM, Jamison Hope wrote:
Is there a way to invoke procedures defined with case-lambda from Java?
There's the $Mn$Grlist Location which presumably points to the
case-lambda body, but that's all. I was hoping to find either a family
of overloaded methods (akin to what you get when using #!optional args),
There is a family of non-public methods: lambda1 ... lambdaN, one for
each "method" of the lambda-case.
or a single $To$List method which performed the dispatch internally.
Nope. What it does is create a GenericProcedure object, and then
dispatch on that depending on argument matching. Using a
GenericProcedure is not optimized well, and may be overkill
for case-lambda, but that is what is happening ...
The $Mn$Grlist field does hold the value of that GenericProc.
In the current SVN it will probably be an Object rather than
a Location - either way you might consider:
(define-constant ->list :: procedure
(case-lambda ...))
Then $Mn$Grlist will have type gnu.mapping.Procedure, which
means you can use Procedure's various apply* methods.
--
--Per Bothner
per@bothner.com http://per.bothner.com/