The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <iterator>
#include <algorithm>
#include <vector>
#include <string>
#include <iostream>
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.cbegin(), coll.cend(), // source
ostream_iterator<string>(cout,"\n")); // destination
}