From: Duncan Mak <duncanmak@gmail.com>
To: kawa mailing list <kawa@sourceware.org>
Subject: Going from Scheme list to Java array
Date: Mon, 22 Jun 2020 12:26:05 -0400 [thread overview]
Message-ID: <CABgWrqqYk5620G06mypC7vDTrqp=GE6E=WKoX7hUxMMjUZXqpA@mail.gmail.com> (raw)
Hello,
it doesn't look like there's a Scheme list -> Java array conversion
function, so I tried to write one modelled after the function from Clojure:
(define (into-array l ::java.util.List array-type)
(let* ((size (length l))
(array ((primitive-array-new array-type) size)))
(l:toArray array)))
(display (into-array (list 1 2 3) <int>))
When I run this in Kawa 3.1.1, this is what I see:
foo.scm:4:5: warning - more than one possibly applicable method 'toArray'
in java.util.List
candidate: Type java.lang.Object[] java.util.List.toArray(ClassType
java.util.function.IntFunction<null>)
candidate: Type java.lang.Object[]
java.util.List.toArray(java.lang.Object[])
Argument (null) to 'gnu.lists.Pair.toArray' has wrong type
at gnu.mapping.CallContext.matchError(CallContext.java:185)
at gnu.expr.GenericProc.applyToConsumerGP(GenericProc.java:132)
at gnu.mapping.CallContext.runUntilDone(CallContext.java:586)
at gnu.mapping.CallContext.runUntilValue(CallContext.java:669)
at gnu.mapping.Procedure.applyL(Procedure.java:136)
at gnu.kawa.reflect.Invoke.applyToObject(Invoke.java:198)
at gnu.mapping.CallContext.runUntilValue(CallContext.java:656)
at gnu.mapping.Procedure.apply3(Procedure.java:167)
at foo.intoArray(foo.scm:4)
at foo.intoArray$check(foo.scm:1)
at gnu.mapping.CallContext.runUntilValue(CallContext.java:656)
at gnu.mapping.Procedure.apply2(Procedure.java:160)
at foo.run(foo.scm:6)
at gnu.expr.ModuleExp.evalModule2(ModuleExp.java:290)
at gnu.expr.CompiledModule.evalModule(CompiledModule.java:42)
at gnu.expr.CompiledModule.evalModule(CompiledModule.java:60)
at kawa.Shell.runFile(Shell.java:571)
at kawa.Shell.runFileOrClass(Shell.java:474)
at kawa.repl.processArgs(repl.java:710)
at kawa.repl.main(repl.java:830)
Is there a better way to write this? What's the right way to do this
conversion and should we include it into the system?
--
Duncan.
next reply other threads:[~2020-06-22 16:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-22 16:26 Duncan Mak [this message]
2020-06-22 16:58 ` Per Bothner
2020-06-23 0:08 ` Per Bothner
2020-06-23 0:28 ` Duncan Mak
2020-06-23 17:23 ` Per Bothner
2020-06-23 0:02 ` Per Bothner
2020-06-23 0:05 ` Duncan Mak
2020-06-23 11:10 ` spellcard199
2020-06-23 17:34 ` Per Bothner
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