Re: Copying rows in a two dimensional array.

[Pascal Obry <pascal@obry.net>]

A pattern that I have used in some applications. I have an application
that output structured strings, so I use something like that:

   type Index is range 1 .. 100;
   type Output is new String (Index);

   subtype Label    is Index range 1 .. 10;
   subtype Code     is Index range 12 .. 18;
   subtype Category is Index range 35 .. 50;
   ...

You get the idea... Then the code is simply:

   Line : Output;

   Line (Code) := "...";
or
   Put_Line (Line (Category));
or
   if Line (Code) = "..." then

An equivalent code using routines (a la C, using strcpy, strcmp) will
never be as readable as the use of slices in Ada. I would even say that
such code become obfuscated beyond anything acceptable to my taste.

Pascal.


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