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From: "Alex R. Mosteo" <devnull@mailinator.com>
Newsgroups: comp.lang.ada
Subject: Re: Question about Streams and UDP sockets using GNAT.Sockets
Date: Wed, 19 Jul 2006 12:36:37 +0200
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Date: 2006-07-19T12:36:37+02:00
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Randy Brukardt wrote:

> "Alex R. Mosteo" <devnull@mailinator.com> wrote in message
> news:4i3r3nF215adU1@individual.net...
> ...
>> I've workarounded this in past versions of GNAT using a direct call to
>> the Write procedure in Ada.Streams, though you must use a
>> Stream_Element_Array instead of a String. Doing so your array is
>> transferred in a single call and packet. (Contrarily to using the 'Write
>> attribute of Stream_Element_Array, that will also make a call for every
>> element, which is very CPU expensive for large arrays).
> 
> If the type you are sending is more complex than a simple array, you
> probably should try to use 'Write (Unchecked_Conversion won't necessarily
> work on complex types). The best way to do it is to create a buffer stream
> type that simply puts the bytes in a Stream_Element_Array. Then use the
> direct call to the Write procedure of the socket stream.

I also have implemented a stream type to do this. Take a look to the child
packages under Agpl.Streams:

https://svn.mosteo.com/public/agpl/

and particularly to

https://svn.mosteo.com/public/agpl/agpl-streams-circular.ads
https://svn.mosteo.com/public/agpl/agpl-streams-circular_unbounded.ads

These may involve some extra copying around, but you can adapt them to avoid
it.