C++/Set Multiset/multiset insert

Insert 4 again to an integer set and process return value

<source lang="cpp">

/* The following code example is taken from the book

* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/

1. include <iostream>
2. include <set>
3. include <algorithm>
4. include <iterator>

using namespace std; int main() {

   /* type of the collection:
    * - duplicates allowed
    * - elements are integral values
    * - descending order
    */
   typedef multiset<int,greater<int> > IntSet;
   IntSet coll1;        // empty multiset container
   // insert elements in random order
   coll1.insert(4);
   coll1.insert(3);
   coll1.insert(5);
   coll1.insert(1);
   coll1.insert(6);
   coll1.insert(2);
   coll1.insert(5);
   // iterate over all elements and print them
   IntSet::iterator pos;
   for (pos = coll1.begin(); pos != coll1.end(); ++pos) {
       cout << *pos << " ";
   }
   cout << endl;
   // insert 4 again and process return value
   IntSet::iterator ipos = coll1.insert(4);
   cout << "4 inserted as element "
        << distance(coll1.begin(),ipos) + 1
        << endl;

} /* 6 5 5 4 3 2 1 4 inserted as element 5

*/
       
 </source>

Insert elements in array to a multiset

<source lang="cpp">

1. include <iostream>

using std::cout; using std::endl;

1. include <set> // multiset class-template definition
2. include <algorithm> // copy algorithm
3. include <iterator> // ostream_iterator

int main() {

  int a[ 10 ] = { 7, 22, 9, 1, 18, 30, 100, 22, 85, 13 };
  std::multiset< int, std::less< int > > intMultiset;
  std::ostream_iterator< int > output( cout, " " );
  // insert elements of array a into intMultiset
  intMultiset.insert( a, a + 10 );
  cout << "\nAfter insert, intMultiset contains:\n";
  std::copy( intMultiset.begin(), intMultiset.end(), output );

  cout << endl;
  return 0;

}

/* 

After insert, intMultiset contains: 1 7 9 13 18 22 22 30 85 100

*/       
 </source>

Insert element to a multiset

<source lang="cpp">

1. include <iostream>

using std::cout; using std::endl;

1. include <set> // multiset class-template definition
2. include <algorithm> // copy algorithm
3. include <iterator> // ostream_iterator

int main() {

  int a[ 10 ] = { 7, 22, 9, 1, 18, 30, 100, 22, 85, 13 };
  std::multiset< int, std::less< int > > intMultiset;
  std::ostream_iterator< int > output( cout, " " );
  cout << "There are currently " << intMultiset.count( 15 )
     << " values of 15 in the multiset\n";
  intMultiset.insert( 15 );
  intMultiset.insert( 15 );
  cout << "After inserts, there are " << intMultiset.count( 15 )
     << " values of 15 in the multiset\n\n";

  cout << endl;
  return 0;

} /* There are currently 0 values of 15 in the multiset After inserts, there are 2 values of 15 in the multiset

*/
       
 </source>