Re: I/O streaming with custom data transport

Maciej Sobczak <no.spam@xxxxxxxxxxx> writes:

procedure Write_Hello(Stream : in out Stream_Access) is
begin
String'Write(Stream, "Hello");
end Write_Hello;

I don't understand this. Ada streams are streams of Stream_Elements
(usually bytes), and the 'Read/'Write attributes encode things in
some way that is not necessarily human-readable. For example,
I think the above outputs the bounds of the string in some
binary form.

But the original question was about streams of characters,
intended to be human-readable. Right?

So how do Ada's streams help, here?

It seems to me what you want is an abstract Character_Output_Stream
type, with a primitive (or class-wide?) operation that puts a Character
to the stream. Then you can make derived types for sending to a file,
to an in-memory buffer, etc.

- Bob
.

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