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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 05:23:49 +0200
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Date: 2005-03-24T05:23:49+02:00
List-Id: <comp.lang.ada>

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

             return array[index-min+1];
         }

         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