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()
{
// print ten times 7.7
fill_n(ostream_iterator<float>(cout, " "), // beginning of destination
10, // count
7.7); // new value
cout << endl;
list<string> coll;
// insert "hello" nine times
fill_n(back_inserter(coll), // beginning of destination
9, // count
"hello"); // new value
PRINT_ELEMENTS(coll,"coll: ");
// overwrite all elements with "again"
fill(coll.begin(), coll.end(), // destination
"again"); // new value
PRINT_ELEMENTS(coll,"coll: ");
// replace all but two elements with "hi"
fill_n(coll.begin(), // beginning of destination
coll.size()-2, // count
"hi"); // new value
PRINT_ELEMENTS(coll,"coll: ");
// replace the second and up to the last element but one with "hmmm"
list<string>::iterator pos1, pos2;
pos1 = coll.begin();
pos2 = coll.end();
fill (++pos1, --pos2, // destination
"hmmm"); // new value
PRINT_ELEMENTS(coll,"coll: ");
}