From: Per Bothner <per@bothner.com>
To: Alcides Flores Pineda <alcides.fp@gmail.com>,
Kawa Mailing List <kawa@sourceware.org>
Subject: Re: Strange ClassCastException
Date: Sun, 21 Sep 2014 07:54:00 -0000 [thread overview]
Message-ID: <541E8409.5010502@bothner.com> (raw)
In-Reply-To: <8761ghwobe.fsf@vostro1520.AFP-HOME>
On 09/20/2014 10:11 PM, Alcides Flores Pineda wrote:
> So, my question is: Is this a known bug/feature?
It's a bug. Originally, Kawa arithmetic only worked for "Kawa numbers"
i.e. the classes is gnu.math. But at this point you're supposed to
be able to mix and match "Kawa numbers" and "Java numbers".
The error "java.lang.Double cannot be cast to gnu.math.Numeric" is because
we're using a raw cast to gnu.math.Numeric (i.e. a Kawa numbers), though
the actual return type in this case is a "Java number". We need to
either use a "smart cast" (i.e. gnu.kawa.listexpr.LangObjType.coerceNumeric)
or fix the return type.
The former is a only line fix, but I should also consider tweaking the
calculated return type.
> Should I submit a bug report?
Not needed. (But if I don't report a fix in a day or two, remind me.)
> Is it not-recommended to mix Java and Scheme library functions?
It's supposed to work.
--
--Per Bothner
per@bothner.com http://per.bothner.com/
next prev parent reply other threads:[~2014-09-21 7:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-21 5:16 Alcides Flores Pineda
2014-09-21 7:54 ` Per Bothner [this message]
2014-09-22 6:54 ` Per Bothner
2014-09-22 16:22 ` Alcides Flores Pineda
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