Re: ISO standards

From:
Carl Barron <cbarron413@adelphia.net>
Newsgroups:
comp.lang.c++.moderated
Date:
Mon, 28 Jan 2008 13:52:16 CST
Message-ID:
<280120081125164304%cbarron413@adelphia.net>
In article <13ppmlo5j1f1qac@corp.supernews.com>, Jeffrey Baker
<tbirdjb2@earthlink.net> wrote:

The vector needs a new object for each 10th place to maintain its data and
show it.

   Does it? consider:
// Tabulator.hpp
#ifndef TABULATOR_HPP_INCLUDED
#define TABULATOR_HPP_INCLUDED

#include <vector>

class Tabulator
{
    std::vector<int> data;
public:
    typedef std::vector<int>::const_iterator iterator;
    // contents need sorting via sort() after a sequence
    // of insert()'s are called. [not each insert()]
    void sort();
    // the sequence [begin(i),end(i) ) provides contents
    // of bin i.
    iterator begin(int i)const;
    iterator end(int i)const;
    void insert(int x);
};

#endif
// tabulator.cp - details...
#include "tabulator.hpp"
#include <algorithm>

void Tabulator::sort()
{
    std::sort(data.begin(),data.end());
}

Tabulator::iterator Tabulator::begin(int i) const
{
    return std::lower_bound(data.begin(),data.end(),10*i);
}

Tabulator::iterator Tabulator::end(int i) const
{
    return std::upper_bound(data.begin(),data.end(),10*i+9);
}

void Tabulator::insert(int x)
{
    data.push_back(x);
}
// main.cp
#include "tabulator.hpp"
#include <algorithm>
#include <iterator>
#include <iostream>

int data[] =
{1,50,98,9,76,2,88,22,49,52,0,89,54,25,4,56,97,5,40,44,17,30,75,6,33,7,3
6,10,58,38,65,-1};

int main()
{
    Tabulator tab;

    for(int *p = data;*p>=
    0;++p)
       tab.insert(*p);
    tab.sort();
    for(int i=0;i!=10;++i)
    {
       std::cout << "values in bin " << i << '\n';
       std::copy(tab.begin(i),tab.end(i),
          std::ostream_iterator<int>(std::cout," "));
       std::cout << '\n';
    }
}
// end code

Looks OOP to me the user of Tabulator should care less about the
implementation details and is provided only specified operations on its
contents.

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