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From: Lutz Donnerhacke <lutz@iks-jena.de>
Newsgroups: comp.lang.ada
Subject: Efficient Stream_IO
Date: Tue, 13 Apr 2004 08:38:34 +0000 (UTC)
Organization: IKS GmbH Jena
Message-ID: <slrnc7n9oa.oj.lutz@taranis.iks-jena.de>
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Xref: archiver1.google.com comp.lang.ada:7035
Date: 2004-04-13T08:38:34+00:00
List-Id: <comp.lang.ada>

Is there a portable way to implement efficient IO on streams?
Especially String to Stream_Element_Array conversions?

I do have the problem, that my Ada implementation of a netflow collector
requires considerably more CPU cycles than the C implementation. Of course,
I have to profile the code in detail, but I suspect String'Read/Write as
iterated Character'Reads/Writes as a major contribution.

An unportable implementation would be:

-- Don't do this!
procedure Put(Stream : access Root_Stream_Type'Class; s : String) is
  data : Stream_Element_Array(1 .. s'Length);
  pragma Import(Ada, data);
  for data'Address use s'Address;
  pragma Assert(Stream_Element_Array'Component_Size = String'Component_Size);
  pragma Assert(data'Size = s'Size);
begin
  Write(Stream, data);
end Put;