Re: Streams Quandry in Ada95

[d96andgi@dtek.chalmers.se (Anders Gidenstam)]

In article <3A37B3C3.86CFCF66@home.com>,
	"Warren W. Gay VE3WWG" <ve3wwg@home.com> writes:
>
>The problem is that the codec routine Pump() cannot
>work with its arguments, because they are from an abstract
>stream (Audio_Stream).  However, I cannot make them concrete,
>unless I choose BEFOREHAND, what streams I want to use (in
>this case I would be forced to choose Au_Stream and/or DSP_Stream,
>which are derived from Audio_Stream).
>
>But I want to accept _ANY_ Audio_Stream _DERIVED_ stream.
>

Hello!

Atleast one thing is for sure, and that is that Pump won't
accept any argument of type Au_Stream_Type, since that type
isn't derived from Audio_Stream_Type..
Anyway, I'm not sure I understand what the other problem is,
couldn't you define the operations you need to manipulate any
stream derived from Audio_Stream_Type as abstract subprograms
along with the definition of Audio_Stream_Type?

Just my 0.25 sek..

Regards

Anders Gidenstam
-- 
--------------------------------------------
"A well-written program is its own heaven; 
 a poorly-written program is its own hell."
  - The Tao of Programming