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From: Ioannis Vranos <ivr@remove.this.grad.com>
Newsgroups: comp.lang.ada,comp.lang.c++
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: Thu, 24 Mar 2005 05:28:24 +0200
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Date: 2005-03-24T05:28:24+02:00
List-Id: <comp.lang.ada>

Ioannis Vranos wrote:
> 
> Jim Rogers wrote:
> 
>> My reading of the information at that url indicates that GMP allows
>> the specification of precision, but not the specification of a limited
>> range of valid values.
> 
> 
> Since I have had enough with this signed value range of Ada, here is a 
> quick implementation of mine and some uses of it.
> 
> I am sure one can create a better one or a container directly that 
> supports ranges, if he devotes some time, so the question again arises, 
> since it is possible and nothing exists, probably it is not considered 
> useful to have such a feature in C++:
> 
> 
> #include <vector>
> #include <algorithm>
> #include <cstdlib>
> 
> template <class T>
> class range
> {
>     std::vector<T> array;
>     T min, max;
> 
>     public:
>         range(const T &mi, const T &ma):array(ma-mi+1), min(mi), max(ma)
>         {
>             using namespace std;
> 
>             if(max-min<=0)
>                ;//throw some exception
> 
>             for(typename vector<T>::size_type i=0; i<array.size(); ++i)
>                array[i]=min+i;
>         }
> 
>         const T &operator[](const T &index)
>         {
>             // Add range checking max>=index>=min if desirable

             fixed: return array[index-min];
>         }
> 
>         operator T() { return array.size(); }
> 
> };
> 
> 
> int main()
> {
>     using namespace std;
> 
>     range<int> r(-100, -20);
> 
>     vector<int> vec(r);
> 
>     vec[r[-65]]=3;
> }


-- 
Ioannis Vranos

http://www23.brinkster.com/noicys