Re: Are functional objects (functors/closures) possible?

[Paul Kienzle]

Hmmm....

maybe you could fake a curry using a DLD function.  You could
call it something like:

        f = curry('x','y','g(x,y,$a,$b)')

which would do the equivalent of the following:

        static n = 0;
        global curry_val;
        s.a = a;
        s.b = b;
        curry_val{n} = s;
        eval(sprintf("function curry_ret = curry%d(x,y)\n\
                      s=curry_val{%d};\n\
                      curry_ret=g(x,y,s.a,s.b);\n\
                      endfunction",n,n);
        n++;

This is a little cleaner if curry were a text function:

        f = curry x y "g(x,y,$a,$b)"

but right now you cannot tag a function as a text function
unless it is a built-in.

Paul Kienzle
address@hidden

On Fri, Nov 22, 2002 at 11:07:52AM -0600, John W. Eaton wrote:
> On 21-Nov-2002, Brett Viren <address@hidden> wrote:
> 
> | I am using Octave 2.1.36 for the "lsode" ODE solver.  The ODE I want
> | to solve is a function of many parameters.  Is there some way to pass
> | in these parameters to the function to be used durring the "lsode"
> | running?
> | 
> | The only thing I can think of is to use globals.
> 
> To me, that seems to be a reasonable way to solve this problem.  If
> many global variables bother you, you can pack all the data in a
> structure or cell array (in recent snapshot versions of Octave, at
> least).
> 
> | If octave supported functional objects, (aka functors, aka closures,
> | aka currying) then I could create an instance of "f" which stores the
> | values of its parameters.  Searching google and the ML archives I
> | didn't find anything.
> 
> Right, Octave does not support this.
> 
> | If octave doesn't support this directly, is there a way to use C++
> | functional objects (ie, objects with an operator()()) through writing
> | a dynamically loaded .oct file?
> 
> Sorry, I'm not following what you want.  Can you be more specific
> about what it is you want and how it would help you?
> 
> jwe
> 
> 
> 
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