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From: "(see below)" <yaldnif.w@blueyonder.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Copying rows in a two dimensional array.
Date: Mon, 08 Feb 2010 23:26:38 +0000
Message-ID: <C7964E2E.135979%yaldnif.w@blueyonder.co.uk>
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Date: 2010-02-08T23:26:38+00:00
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On 08/02/2010 21:20, in article wccd40fpgpu.fsf@shell01.TheWorld.com,
"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote:

> It's trivial if you only want slices as R-values.
> And anyway, slices as L-values don't really work:

I can't agree. I have this code:

procedure FFT_to_HWT (FFTCs    : in  complex_array; ...
                      HWT_tree : out complex_array; ...) is
...
   iFFTCs : complex_array (1..f(FFTCs'length));
begin
...
   iFFTCs(1..nr_bins) := FFTCs(first_bin..last_bin);
   iFFTCs(nr_bins+1..iFFT_size) := (others => (0.0,0.0));
   inverse_FFT(iFFTCs(1..iFFT_size));
...
   HWT_tree(next_HWTC..next_HWTC+iFFT_size-1) := iFFTCs(1..iFFT_size);
...
end FFT_to_HWT;

I think that using slices as L-values as well as R-values helps to make this
a lot clearer than it otherwise would be, and probably faster as well.

-- 
Bill Findlay
<surname><forename> chez blueyonder.co.uk