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From: "Xenos" <dont.spam.me@spamhate.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada Popularity: Comparison of Ada/Charles with C++ STL (and Perl)
Date: Wed, 29 Sep 2004 08:01:10 -0400
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Date: 2004-09-29T08:01:10-04:00
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"Martin Krischik" <krischik@users.sourceforge.net> wrote in message
news:3060085.UHp9MgIIe7@linux1.krischik.com...
> typedef explicit int My_Int.
>
> And that means that
>
> typedef Ada :: Range <int, 1, 12> US_Hours;
> typedef Ada :: Range <int, 1, 12> Month;

This problem can be overcome by adding a "unique class" to your template if
you want them to be distinuished:

class default_class {};

template Range<class T, T lo, T hi, class U = default_class>
class Range;

Now if you need the range to be a new type:

class hours_range {};
class month_range;
typedef Range<int, 1, 12, hours_range> Hours;
typedef Range<int, 1, 12, month_range> Month;

They are now unique classes.

>
> are the same for C++. But there are not in real live. And if I use:
>
> class US_Hours Ada :: Range <int, 1, 12> {};
> class Month Ada :: Range <int, 1, 12> {};
>
> I loose the constructors. So there is still something to be improved.

Not true!  You cannot use initializer lists if the class has a constructor.
This is where Ada and C++ differ.