Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!rochester!pt.cs.cmu.edu!andrew.cmu.edu!bader+
From: bader+@andrew.cmu.edu (Miles Bader)
Newsgroups: comp.sys.amiga
Subject: Re: Prototyping function pointers
Message-ID: <EYLW0Py00UkaIMIQI=@andrew.cmu.edu>
Date: 2 May 89 21:39:39 GMT
References: <14424@louie.udel.EDU>
Organization: Information Technology Center, Carnegie Mellon, Pittsburgh, PA
Lines: 42
In-Reply-To: <14424@louie.udel.EDU>

AXDRW%ALASKA.BITNET@cunyvm.cuny.edu (Don R. Withey) writes:
> How does one prototype a function pointer in Lattice 5.02?  I have a function
> pointer that I want to force Lattice to pass the arguments in certain
> registers.  For example:
...
> Now if I want to do the same thing, except MyFunc is a function pointer,
> how do I do it?
> 
>         extern __far __asm MyFunc(register __a0 struct Window *);
>         ...
>         {
>         __fptr  MyFunc;
>         ...
>         MyFunc = SetFunction(...);
>         ...
>         MyFunc(Win);
>         ...
>         }
> 
> This doesn't work that way I want it to, it basically does the following:
...

Your code isn't quite clear, but declaring a local variable with the same
name as a function declaration WON'T make the variable inherit the function's
attributes.

You probably want something like:

{
    /* the declaration of func specifies all the desired attributes */
    void __far __asm (*func)(register __a0 struct Window *);

    /* ... */

    func=SetFunction(...);

    (*func)(Win);

    /* ... */
}

-Miles