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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: for S'Image use Func??
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Date: Tue, 11 May 2010 10:35:24 +0200
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Date: 2010-05-11T10:35:24+02:00
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On Mon, 10 May 2010 23:30:28 +0200, Ludovic Brenta wrote:

> Maciej Sobczak <see.my.homepage@gmail.com> writes:
>> Coming back to I/O - what I miss in Ada is the equivalent of fread in
>> C - that is, an operation that reads *up to* the given number of
>> bytes. Or maybe there is something that I didn't notice? Such an
>> operation is an important basis for custom buffered input.

It is a basis for creating inefficient time and space consuming programs.
But we had this discussion before.

>> Without it
>> the only way to reinvent a proper I/O is via direct bindings to
>> system- level API.
> 
> Ada.Streams.Read (ARM 13.13.1(5)) does just that.
> So does Ada.Text_IO.Get_Line (ARM A.10.1(49)).

I would like to add that "read a byte" is a property of a stream. Not all
files ("everything") are streams. Stream is an interface to an object,
which can be supported by the object or not. But if I have an object like
text buffer, I want an interface of a text buffer, rather than of a stream.
If the object is a data base, I want to stream it even less.

The bottom line is, Ada does it right (tm).

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de