[897] in java-interest
Re: Language spec syntax ambiguities
daemon@ATHENA.MIT.EDU (Gary Funck)
Mon Aug 14 14:31:39 1995
Date: Mon, 14 Aug 95 07:27:43 -0700
From: gary@Intrepid.COM (Gary Funck)
To: java-interest@java.sun.com
G'day,
|
| This is more or less what I'm looking for. However, I don't believe
| this is quite right for a couple of reasons. First, you can also say
| "super(x,y,z)" and "this(x,y,z)" inside a constructor (I suppose by my
| argument above we should special case constructor bodies, but ...).
| Also, I'd argue for something lower down the precidence chain than
| expression since this allows "2+2.foo = 5;" which brings us back to the
| same issue. Finally, this introduces another ambiguity. "a+b" is a
| valid expression so does "a+b.c = 5" mean "(a+b).c = 5" here (that's
| the parse tree you get)?
If the Java language designers open up the Pandora's box of
operator-overloading, then will
(a+b).c = 5
be valid? (if, for example,"+" returns a reference to a class object.)
Likewise, I assume
((myclass)2+2).foo = 5
would become legit as well, since "myclass" might define "+" on objects
of 'myobj' added to integers.
--
| Gary Funck gary@intrepid.com
| Intrepid Technology Inc., Mountain View CA (415) 964-8135
| "Everybody has plans, until they get hit." -- Mike Tyson
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