Re: Re: calculator with additional function

[Hans Aberg]

[Please keep the CC to Help-Bison, so that others may help.]

I only use C++. There, in one case, I built polymorphic (virtual) 
class hierarchy, where the classes have a function evaluate(), which 
can be called, once the closure has been built. The method of 
outputting C and then compile it, I think is used by the Haskell 
<http://haskell.org> compiler GHC. It has also an interpreter, as 
well as Hugs <http://haskell.org/hugs>. In the latter case, it 
generates some kind of byte code, which is then passed onto an 
evaluator engine, which performs the looping. Those are big programs. 
But you have threshold to step over, anyway.

At 14:35 +0200 2005/06/11, address@hidden wrote:
> I can use FLEX and C only.
> Could you give example of code how it shoud looks?
>
>
> > > Hi,
> > >
> > > There was problem with sent my message so I send it again.
> > > I need to write calculator with additional function. It have to
> > > serve loop FOR where I declare how many times it will run and what
> > > will it do inside.
> > > My problem is how to bould data structure (it have to be tree) for
> > > this calculator.
> > > Have You any idea?
> >
> > You have to build a "closure", that can be executed later, building
> > it directly in the actions, in terms of code that can executed after
> > the syntactic termination of the loop. This code can be binary, or an
> > output in some other language that can be compiled and executed
> > later. Most do it directly, by hand, perhaps invoking M4, Guile, or
> > something, as an aid if the output is any other language. Just a few
> > days ago, there has come to my attention the tool
> > <http://www.codeworker.org>, probably useful for more advanced things.
> > --
> >    Hans Aberg


--
  Hans Aberg