Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Click here to view the latest version of this page.
PrevUpHomeNext

Interval

Example interval shows some basic functionality of intervals.

#include <iostream>
#include <string>
#include <math.h>

// Dynamically bounded intervals
#include <boost/icl/discrete_interval.hpp>
#include <boost/icl/continuous_interval.hpp>

// Statically bounded intervals
#include <boost/icl/right_open_interval.hpp>
#include <boost/icl/left_open_interval.hpp>
#include <boost/icl/closed_interval.hpp>
#include <boost/icl/open_interval.hpp>

#include "../toytime.hpp"
#include <boost/icl/rational.hpp>

using namespace std;
using namespace boost;
using namespace boost::icl;

int main()
{
    cout << ">>Interval Container Library: Sample interval.cpp <<\n";
    cout << "----------------------------------------------------\n";

    // Class template discrete_interval can be used for discrete data types
    // like integers, date and time and other types that have a least steppable
    // unit.
    discrete_interval<int>      int_interval  
        = construct<discrete_interval<int> >(3, 7, interval_bounds::closed());

    // Class template continuous_interval can be used for continuous data types
    // like double, boost::rational or strings.
    continuous_interval<double> sqrt_interval 
        = construct<continuous_interval<double> >(1/sqrt(2.0), sqrt(2.0));
                                                 //interval_bounds::right_open() is default
    continuous_interval<string> city_interval 
        = construct<continuous_interval<string> >("Barcelona", "Boston", interval_bounds::left_open());

    discrete_interval<Time>     time_interval 
        = construct<discrete_interval<Time> >(Time(monday,8,30), Time(monday,17,20), 
                                              interval_bounds::open());

    cout << "Dynamically bounded intervals:\n";
    cout << "  discrete_interval<int>:    " << int_interval  << endl;
    cout << "continuous_interval<double>: " << sqrt_interval << " does " 
                                            << string(contains(sqrt_interval, sqrt(2.0))?"":"NOT") 
                                            << " contain sqrt(2)" << endl;
    cout << "continuous_interval<string>: " << city_interval << " does "  
                                            << string(contains(city_interval,"Barcelona")?"":"NOT") 
                                            << " contain 'Barcelona'" << endl;
    cout << "continuous_interval<string>: " << city_interval << " does "  
                                            << string(contains(city_interval, "Berlin")?"":"NOT") 
                                            << " contain 'Berlin'" << endl;
    cout << "  discrete_interval<Time>:   " << time_interval << "\n\n";

    // There are statically bounded interval types with fixed interval borders
    right_open_interval<string>   fix_interval1; // You will probably use one kind of static intervals
                                                 // right_open_intervals are recommended.
    closed_interval<unsigned int> fix_interval2; // ... static closed, left_open and open intervals
    left_open_interval<float>     fix_interval3; // are implemented for sake of completeness but
    open_interval<short>          fix_interval4; // are of minor practical importance.

    right_open_interval<rational<int> > range1(rational<int>(0,1),  rational<int>(2,3));
    right_open_interval<rational<int> > range2(rational<int>(1,3),  rational<int>(1,1));

    // This middle third of the unit interval [0,1)
    cout << "Statically bounded interval:\n";
    cout << "right_open_interval<rational<int>>: " << (range1 & range2) << endl;

    return 0;
}

// Program output:

//>>Interval Container Library: Sample interval.cpp <<
//----------------------------------------------------
//Dynamically bounded intervals
//  discrete_interval<int>:    [3,7]
//continuous_interval<double>: [0.707107,1.41421) does NOT contain sqrt(2)
//continuous_interval<string>: (Barcelona,Boston] does NOT contain 'Barcelona'
//continuous_interval<string>: (Barcelona,Boston] does  contain 'Berlin'
//  discrete_interval<Time>:   (mon:08:30,mon:17:20)
//
//Statically bounded interval
//right_open_interval<rational<int>>: [1/3,2/3)


PrevUpHomeNext