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Message from discussion CommonQt enums and operators
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Eric Eaton  
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 More options Oct 12 2012, 2:33 am
Newsgroups: comp.lang.lisp
From: Eric Eaton <zaim...@gmail.com>
Date: Thu, 11 Oct 2012 23:33:59 -0700 (PDT)
Local: Fri, Oct 12 2012 2:33 am
Subject: Re: CommonQt enums and operators
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On Wednesday, October 10, 2012 9:36:54 AM UTC-7, Raymond Wiker wrote:
> Eric Eaton <> writes:

> > On Monday, October 8, 2012 9:21:03 PM UTC-7, budden wrote:

> >> Hi! I know nothing about CommonQt, but, some general hints: o know what is *STAR* try (describe '*star*), (describe *star*), use inspector of your lisp IDE etc;  Qt reader (#_) _should_ be case sensitive while CL reader is not. Also, it _might_ treat "*" in special way. It is likely to misinterpret *star*, try *STAR* or, better, just give another name to your var:

> >> (defparameter |Star| ...)

> >> (#_operator+= Star (#_new QSize 3 3))

> > Thanks for your reply.

> > The reader macro is for executing foreign functions. I am reasonably sure that it only reads the word following it, which is the name of the C++ method to be called. Overloading += in C++ is done by overloading the function named operator+=. So I assumed it would be the same in commonqt.

> > It appears that there is a function #_operator, and the += is being evaluated normally as the first argument and of course it is unbound. I have to figure out how to use it. There is no documentation which I can find on #_operator.

> I'm reasonably sure that the reader macro is #_, and the argument is

> "operator+=". That is, the reader macro does an FLI lookup of the symbol

> named "operator+=", and applies it to the two arguments.

Yes that seems to be its function, but it was stopping before taking the + character from the stream and normal evaluation resumed on +=. The reader macro processed "operator" and interned a corresponding symbol as a side effect. I assumed this meant that the function actually existed. Changing the reader to accept the character + made everything better.

 
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