Re: Newbie question:procedural variables(call by reference)?

[Jeffrey Carter <spam@spam.com>]

Dmytry Lavrov wrote:

> There are no procedural variables(calls by reference) in ADA,right?(or i
> missed something...).
> How to live without 'em? (i guess , 'like in java' ;-)
> 
> What for example if i have wrote,say.... expression evaluator.
> In Pascal(bit extended),
> and with way to add custom functions,like
> 
> procedure
> AddFunc(name:string;numparams:integer;additionalparam:mashine_word;fn:CustomFunction);

This is called access-to-subprogram in Ada; see ARM 3.10. You'd want 
something like

type Custom_Function is access function (...) return Whatever;

procedure Add_Func (Name              : in String;
                     Num_Params        : in Natural;
                     Additional_Params : in Machine_Word;
                     Func              : in Custom_Function);

Note, however, the restrictions on nesting.

-- 
Jeff Carter
"Mr. President, we must not allow a mine-shaft gap!"
Dr. Strangelove
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