// Fig. 23.33: Fig23_33.cpp
// Standard Library functions copy_backward, merge, unique and reverse.
#include <iostream>
using std::cout;
using std::endl;

#include <algorithm>  // algorithm definitions
#include <vector>     // vector class-template definition
#include <iterator> // ostream_iterator

int main()
{
   const int SIZE = 5;
   int a1[ SIZE ] = { 1, 3, 5, 7, 9 };
   int a2[ SIZE ] = { 2, 4, 5, 7, 9 };
   std::vector< int > v1( a1, a1 + SIZE ); // copy of a1
   std::vector< int > v2( a2, a2 + SIZE ); // copy of a2
   std::ostream_iterator< int > output( cout, " " );

   cout << "Vector v1 contains: ";
   std::copy( v1.begin(), v1.end(), output ); // display vector output
   cout << "\nVector v2 contains: ";
   std::copy( v2.begin(), v2.end(), output ); // display vector output

   std::vector< int > results( v1.size() );

   // place elements of v1 into results in reverse order
   std::copy_backward( v1.begin(), v1.end(), results.end() );
   cout << "\n\nAfter copy_backward, results contains: ";
   std::copy( results.begin(), results.end(), output );
   
   std::vector< int > results2( v1.size() + v2.size() );

   // merge elements of v1 and v2 into results2 in sorted order
   std::merge( v1.begin(), v1.end(), v2.begin(), v2.end(), 
      results2.begin() );

   cout << "\n\nAfter merge of v1 and v2 results2 contains:\n";
   std::copy( results2.begin(), results2.end(), output );
   
   // eliminate duplicate values from results2
   std::vector< int >::iterator endLocation;
   endLocation = std::unique( results2.begin(), results2.end() );

   cout << "\n\nAfter unique results2 contains:\n";
   std::copy( results2.begin(), endLocation, output );
   
   cout << "\n\nVector v1 after reverse: ";
   std::reverse( v1.begin(), v1.end() ); // reverse elements of v1 
   std::copy( v1.begin(), v1.end(), output );
   cout << endl;
   return 0;
} // end main

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