The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference
by Nicolai M. Josuttis, Addison-Wesley, 1999
© Copyright Nicolai M. Josuttis 1999
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
using namespace std;
int main()
{
vector<string> coll;
/* read all words from the standard input
* - source: all strings until end-of-file (or error)
* - destination: coll (inserting)
*/
copy (istream_iterator<string>(cin), // start of source
istream_iterator<string>(), // end of source
back_inserter(coll)); // destination
// sort elements
sort (coll.begin(), coll.end());
/* print all elements without duplicates
* - source: coll
* - destination: standard output (with newline between elements)
*/
unique_copy (coll.begin(), coll.end(), // source
ostream_iterator<string>(cout,"\n")); // destination
}