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 "algostuff.hpp"
using namespace std;
int main()
{
list<int> coll1;
set<int> coll2;
// fill both collections with some sorted elements
INSERT_ELEMENTS(coll1,1,6);
INSERT_ELEMENTS(coll2,3,8);
PRINT_ELEMENTS(coll1,"coll1: ");
PRINT_ELEMENTS(coll2,"coll2: ");
// print merged sequence
cout << "merged: ";
merge (coll1.cbegin(), coll1.cend(),
coll2.cbegin(), coll2.cend(),
ostream_iterator<int>(cout," "));
cout << endl;
}