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From: "Mike Mohr" <nospam@nowhere.com>
Newsgroups: comp.lang.ada
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Subject: Re: ada vs. cpp
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Date: Mon, 08 Oct 2001 17:47:53 GMT
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"Robert*@" <Robert_member@newsguy.com> wrote in message
news:9pski60j31@drn.newsguy.com...
> 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.

struct range {
    int first;
    int last;
  };

range code  = { 0, 4 };
range arg = { 5, 7 };

const string V2 = V1.substr(code.first, code.last) + "-" +
V1.substr(arg.first,srg.last);

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

I have shown you I can get the same functionality
without breaking a sweat.

What kind of support for string transformations does Ada have?

How does it stack up against <algorithms>?

random_shuffle(), next_permutation(), rotate(), etc...

If you want to play my-language-can-do-this-in-1-line-and-yours-cant
games, I'll be happy to oblige.

Since we are discussing orthogonal language features
which constitute string defects if not present, how
do I explicitly pass Ada strings by value or reference?