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From: tarjeij@ulrik.uio.no (Tarjei Jensen)
Subject: Re: overload ":=" ???
Date: 1996/07/23
Message-ID: <TARJEIJ.96Jul23153224@ulrik.uio.no>#1/1
X-Deja-AN: 170235960
references: <dewar.837740729@schonberg> <4soh73$56h@newsbf02.news.aol.com>
organization: University of Oslo, Norway
newsgroups: comp.lang.ada
Date: 1996-07-23T00:00:00+00:00
List-Id: <comp.lang.ada>


The problem with bounded string is that it assigns a global maximum string size
instead of letting each string have its own maximum size. The former is not 
particularly flexible while the latter really require a user defined ":=".

Not the least because the maximum length of the strings might be different.

e.g:

  a : counted_string(4) := "1234";
  b : counted_string(5) := "1234";  -- four characters and space for five

  a := b;  -- Will not work with current version of Ada

In this case an user defined assignment operator would be required to make
things work or the very least a pragma to tell the compiler what the actual
size of the string is. e.g.:

type counted_string ( maximum : positive ) is record
    size : natural;
    str  : string( maximum );
end record;

pragma size_controller( counted_string.str, counted_string.size);
  -- will check  size <= maximum
  -- will check a.maximum >= b.size in example above


While I am in wishing mode I would very much like a third alternative to the
values of S'Bit_Order. I would very much like to have Most_Significant_Byte_First
as a choice (Network order for those who are curious).

 


Greetings,

 
 
--
// Tarjei T. Jensen 
//    tarjeij@ulrik.uio.no || fax +47 51664292  || voice +47 51 85 87 39
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// Working, but not speaking for the Norwegian Hydrographic Service.