equal_range.cpp

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#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
 
#include <examples.h>
 
 
int main ()
{
    // Typedef for convenience.
    typedef std::vector<int, std::allocator<int> > Vector;
 
    Vector::value_type arr[] = { 0, 1, 2, 2, 3, 4, 2, 2, 2, 6, 7 };
 
    // Set up a vector.
    Vector v1 (arr, arr + sizeof arr / sizeof *arr);
 
    // Try equal_range variants.
    std::pair<Vector::iterator, Vector::iterator> p1 =
        std::equal_range (v1.begin (), v1.end (), 3);
 
    std::pair<Vector::iterator, Vector::iterator> p2 =
        std::equal_range (v1.begin (), v1.end (), 2,
                     std::less<Vector::value_type> ()); 
 
    // Output results.
    std::cout << "\nThe equal range for 3 is: "
              << "(" << *p1.first << " , " 
              << *p1.second << ")" << std::endl;
 
    std::cout << "\nThe equal range for 2 is: "
              << "(" << *p2.first << " , " 
              << *p2.second << ")" << std::endl; 
 
    return 0;
}