// This is a simple example of the “negate” unary functor.

#include <iostream>
#include <set>
#include <algorithm>
#include <iterator>

using namespace std;

int main() {
    int vals[] = {3,1,4,1,5,9};

    transform(vals, vals+6, ostream_iterator<int>(cout, ","),
	      negate<int>());
    cout << '\n';
}