Re: [slang-users] Accessing Functions using an array

[Doug Burke <dburke@xxxxxxxxxxxxxxx>]

On Dec 22, 2004, at 3:27 PM, Ben Duncan wrote:

> Is it possible and how would you do it, to set up an
> array that contains function names (slang, not C)
> like such (pseudo code below):
>
> define functioname_1 { .....}
> define functioname_2 { .....}
> define functioname_3 { .....}
> ......
>
> MyArray [10] ;
> MyArray[0] = "functioname_1" ;
> MyArray[1] = "functioname_2" ;
> MyArray[2] = "functioname_3" ;
>
> .....
> ......
>
> if(SELECTED != 0 )
>   do MyArray[SELECTED]
> ..........
>
>
> What I am trying to do is set an index to functions that the SLAG 
> RAD/IDE
> generates. Each FUNCTION is really a "screen" to display. If the 
> application
> contains more than one screen you would increment "SELECTED" and then 
> the
> next screen would display.

Ben,

If I understand you correctly then you want to use a reference to a 
function using the "&" operator and then call the routine by 
de-referencing the value using "@" (see also 
http://www.s-lang.org/doc/html/slang-3.html#ss3.3). Something like

define bob () { message ("Hi, this is bob"); }
define fred () { message ("I am fred"); }

variable funcs = Ref_Type [2];
funcs [0] = &bob;
funcs [1] = &fred;

variable i = 1;

@ funcs [i]();
i--;
@ funcs [i]();



Will call the routines fred() and then bob(). If the routines took 
arguments then you can say '@ funcs [i] ( arg1, ..., argn );'.

For situations like this I often use an 'Assoc_Type [Ref_Type]' array 
to store the function references, but it depends on how you want to 
access them.

Hope this helps,
Doug


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