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NNTP-Posting-Date: Tue, 01 Sep 2009 05:48:51 -0500
Newsgroups: comp.lang.ada
Subject: Re: Ada Shootout program for K-Nucleotide (patches)
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From: Ole-Hjalmar Kristensen
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Organization: Sun Microsystems
Date: 01 Sep 2009 12:48:50 +0200
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Date: 2009-09-01T12:48:50+02:00
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>>>>> "GB" == Georg Bauhaus <rm.dash-bauhaus@futureapps.de> writes:
OK, I see. In GNAT, the stream_io is a relatively thin layer on top of
the C streams, isn't it? So you will get essentially the same speed as
the C standard IO library. But does Stream_Io have a version of
get_line? I know the C streams interface has a binding to fgets, but
that is just using fgets directly. How did you read line by line with
Stream_Io?

The only way I can think of to improve on fgets is to get
rid of the copying, but would you then strictly be reading line by
line?

I am thinking of something like 

procedure get_line(buffer : in out string; first : out natural; last :out natural);

This get_line would only need to copy when it encounters a string which
extends past the end of the buffer, in the normal case it would only
return the indices of the slice.

    GB> Ole-Hjalmar Kristensen schrieb:
    >> I see the C++ version uses fgets, which is a reasonably fast way of
    >> getting a line. Is there any reason not to use fgets?
    >> fgets (OpenSolaris version) uses memccpy to actually copy the buffer
    >> until the newline:

    GB> There were two reasons not to import fgets:

    GB> 1 - fgets turns out not to be faster than Stream_IO.
    GB> 2 - It's C. ;-)


    GB> The fasta entry at the Shootout which uses Unchecked_Conversion,
    GB> not 'Address could even be improved a small bit if we change
    GB> it to use 'Address.  But then, this adds to the line count.
    GB> Is it worth it, for a shorter program?

    GB> There was a discussion leading to this
    GB> (<4a7b4daa$0$31333$9b4e6d93@newsspool4.arcor-online.net>)
    GB> early in August.

-- 
   C++: The power, elegance and simplicity of a hand grenade.