Re: Let's change semantics of "use type"

["R. Tim Coslet" <R_Tim_Coslet@pacbell.net>]

The only real use I have ever found in Ada95 for rename is when I need to
make repeated references to the same array element in several places in a
block of code. I rename the array element (to tell the compiler to index it
only once) then use the new name in the places in the code that reference
it.

Example:

    declare
        Selected_Item : Some_Typ renames Big_Arrayo_of_Data(x,y,z);
    begin
        if Selected_Item = Special_Value then
            y := Complex_Function(Selected_Item,z);
            ... more code refering to Selected_Item ...
        end if;
        Selected_Item := Fancy_Function(x,i);
    end;

Note: in the above code the change in y does NOT affect the item already
indexed, so Selected_Item still refers to the same item.

-- 
        R. Tim Coslet
        r_tim_coslet@pacbell.net

Technology, n. Domesticated natural phenomena.


> From: dennison@telepath.com (Ted Dennison)
> Organization: http://groups.google.com/
> Newsgroups: comp.lang.ada
> Date: 11 Nov 2002 07:59:47 -0800
> Subject: Re: Let's change semantics of "use type"
> 
> 
> I've done quite a bit of tagged type programming in Ada95, and I have
> *never* used a rename that way. In fact, I don't believe I've used a
> single rename in Ada95 ever...
>