find_first_of.cpp

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#include <algorithm>    // for find_first_of()
#include <functional>   // for equal_to
#include <iostream>     // for cout, endl
#include <iterator>     // for ostream_iterator
#include <vector>       // for vector
 
#include <examples.h>
 
int main ()
{
    // Typedef for convenience.
    typedef std::vector<int, std::allocator<int> > Vector;
 
    const Vector::value_type a1[] = { 0, 1, 2, 2, 3, 4, 2, 2, 6, 7 };
    const Vector::value_type a2[] = { 6, 4 };
 
    // Set up two vectors.
    const Vector v1 (a1, a1 + sizeof a1 / sizeof *a1);
    const Vector v2 (a2, a2 + sizeof a2 / sizeof *a2);
 
    // Try both find_first_of variants.
    Vector::const_iterator it1 =
        std::find_first_of (v1.begin (), v1.end (), v2.begin (), v2.end ()); 
 
    Vector::const_iterator it2 =
        std::find_first_of (v1.begin (), v1.end (), v2.begin (), v2.end (),
                            std::equal_to<Vector::value_type>());
 
    // Create an output stream iterator.
    std::ostream_iterator<Vector::value_type,
                          char,
                          std::char_traits<char> > out (std::cout, " " );
 
    // Output results.
    std::cout << "For the vectors { ";
    std::copy (v1.begin (), v1.end (), out);
 
    std:: cout << "} and { ";
    std::copy (v2.begin (), v2.end (), out);
 
    std::cout << "}\nboth versions of find_first_of point to: "
              << *it1 << std::endl; 
 
    // Return 0 on success, non-0 on failure.
    return !(*it1 == *it2);
}