Re: OO in Ada

[Jeffrey Carter <jrcarter@acm.org>]

Matthew Heaney wrote:
> "SteveD" <nospam_steved94@attbi.com> wrote in message
> news:JVrn9.40015$FO4.9224@sccrnsc03...
> 
>>In C++ there is a hidden "this" pointer quietly hiding in the background
>>that you must be very much aware of (if you're doing any serious
>>programming).  In Ada this is an explicit variable passed into the
>>procedure.
> 
> 
> This is also true in Ada, wrt passing unconstrained arrays:
> 
> procedure Op (S : String) is
> 
> You're actually passing a descriptor on the stack, which contains info about
> the string's length and index range.  So here there is "hidden" information
> being passed too, not unlike an implicit this-ptr in C++.

How this is passed is implementation dependent. Some implementations may 
work as indicated, but others may simply pass an address. Some may pass 
a copy of the actual parameter.

-- 
Jeff Carter
"Have you gone berserk? Can't you see that that man is a ni?"
Blazing Saddles