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From: "gshibona @ b e l l s o u t h . n e t" <gshibona@bellsouth.net>
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Newsgroups: comp.lang.ada
Subject: array slices
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NNTP-Posting-Date: Mon, 12 May 2003 21:09:57 EDT
Date: Mon, 12 May 2003 21:24:31 -0400
Xref: archiver1.google.com comp.lang.ada:37254
Date: 2003-05-12T21:24:31-04:00
List-Id: <comp.lang.ada>

I wonder if someone could point to the error in this code.  I'm looking
to fill array a with a "row" slice
of array c.   There doesn't appear to be much info on this particular
facet of Ada, yet what I have seen
suggests that the syntax below is correct.

procedure ada_2daryslice is

a : array(1..4) of integer;
c : array( 1..2, 1..4 ) of integer;

begin
    c :=  (
         1 => (0, 1, 2, 4 ),
         2 => (8, 16, 32, 64)
         );
    -- this seems to yield the expected results
    a(1..4) := ( 1,2,3,4);

    -- however, this does not...
    a(1..4) := c(1)(1..4);

end ada_2daryslice;

The compiler complains of too few subscripts in the array reference.
To wit...

gnatmake -g -gnatv ada2daryslice.adb
gnatgcc -c -g -gnatv ada2daryslice.adb

GNAT 3.13p  (20000509) Copyright 1992-2000 Free Software Foundation,
Inc.

Compiling: ada2daryslice.adb (source file time stamp: 2003-05-13
01:20:09)

    17.     a(1..4) := c(1)(1..4);
                                   |
        >>> too few subscripts in array reference

 17 lines: 1 error
gnatmake: "ada2daryslice.adb" compilation error

It's quite possible that I've been looking at this for much too long to
be objective.   Thanks in advance
for any help.

Ger