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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, 10 Mar 2005 12:51:14 +0200
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Xref: g2news1.google.com comp.lang.ada:9023 comp.lang.c++:44936
Date: 2005-03-10T12:51:14+02:00
List-Id: <comp.lang.ada>

Georg Bauhaus wrote:

> The same way, using the random number generator and the
> STL-like containers. (See Ada 95 for the genertors, and
> AI-302 or Ada 2005 for the STL-like container library.)
> 
> Functions are passed to a passive iterator like in
> 
>    ...
>    procedure some_proc (e: int);
>    ...
>    iterate(some_vec, some_proc'access);


Has Ada this level of abstraction and compile-time safety? (the same 
code made more high-level):


#include <iostream>
#include <vector>
#include <ctime>
#include <algorithm>
#include <functional>
#include <map>
#include <iterator>


int main()
{
     using namespace std;

     vector<int> vec(1000);

     map<int, int> iimap;

     // Seeds the random number generator
     srand(time(0));

     // Use rand() to fill vector with values
     // As you see the operation is entirely safe.
     generate(vec.begin(), vec.end(), rand);


     // Finds the first occurrence of an int smaller than 1000
     vector<int>::iterator p= find_if(vec.begin(), vec.end(),
                                             bind2nd(less<int>(), 1000) );

     int index= distance(vec.begin(), p);

     // Stores the index and the value in a map
     iimap[index]= *p;


     cout<<"index: "<<index<<"\tValue: "<<iimap[index]<<"\n";
}


C:\c>temp
index: 32       Value: 169

C:\c>



-- 
Ioannis Vranos

http://www23.brinkster.com/noicys