ul_bound.cpp

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#include <vector>
#include <algorithm>
#include <functional>
#include <iostream>
 
int main ()
{
    typedef std::vector<int, std::allocator<int> > Vector;
    typedef Vector::const_iterator                 Iterator;
 
    const int a[] = { 0, 1, 2, 2, 3, 4, 5, 5, 5, 6, 7 };
 
    // Set up a vector.
    const Vector v (a, a + sizeof a / sizeof *a);
 
    // Try lower_bound variants.
    Iterator it1 = std::lower_bound (v.begin (),v.end (), 3);
    Iterator it2 = std::lower_bound (v.begin (),v.end (), 2,
                                     std::less<int>());
 
    // Try upper_bound variants.
    Iterator it3 = std::upper_bound (v.begin (), v.end (), 3);
    Iterator it4 = std::upper_bound (v.begin (), v.end (), 2,
                                     std::less<int>());
 
    std::cout << "\n\nThe upper and lower bounds of 3: ( "
              << *it1 << " , " << *it3
              << " ]\n\n\nThe upper and lower bounds of 2: ( "
              << *it2 << " , " << *it4 << " ]\n";
 
    return 0;
}