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From: Robert*@ <Robert_member@newsguy.com>
Newsgroups: comp.lang.ada
Subject: Re: ada vs. cpp
Date: 8 Oct 2001 09:34:14 -0700
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Date: 2001-10-08T09:34:14-07:00
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In article <d7jw7.172545$w7.26206237@news02.optonline.net>, "Mike says...
>
 

>>
>>         subtype Code is Positive range 1 .. 4;
>>         subtype Arg  is Positive range 6 .. 8;
>>
>>         V2 : constant String := V1 (Arg) & '-' & V1 (Code);
 
>const string V1 = "0123/zzz";
>const string V2 = V1.substr(0, 4) + "-" + V1.substr(5,7);
>
>Even though your efforts to describe something easy for Ada
>and hard for C++ have failed, you should know that I can play
>these C++-strings-can-do-this-in-2-lines-and-Ada-can't
>games as well.
>
 
The difference is that in Ada the range itself is a separate type declaration.
So, one can change the range type in one place and have it propgate all
over. With your attempt, you hardcoded the range using magic numbers in
the variable declaration itself, so if the same range is to be used 
somewhere else in the code, or in different variable declaration, you 
need to type it there too manually. 


There is nothing equivelant in C++ to declaring a new type integer 
with restricted range. It is simply not in the C++ language.