Remove all elements with values less than 50

/* The following code example is taken from the book * "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <iostream>#include <set>#include <deque>#include <algorithm>using namespace std;/* PRINT_ELEMENTS() * - prints optional C-string optcstr followed by * - all elements of the collection coll * - separated by spaces */template <class T>inline void PRINT_ELEMENTS (const T& coll, const char* optcstr=""){    typename T::const_iterator pos;    std::cout << optcstr;    for (pos=coll.begin(); pos!=coll.end(); ++pos) {        std::cout << *pos << ' ';    }    std::cout << std::endl;}int main(){    set<int,greater<int> > coll1;    deque<int> coll2;    // insert elements from 1 to 9    for (int i=1; i<=9; ++i) {        coll1.insert(i);    }    PRINT_ELEMENTS(coll1,"initialized: ");    // transform all elements into coll2 by multiplying 10    transform (coll1.begin(),coll1.end(),        // source               back_inserter(coll2),             // destination               bind2nd(multiplies<int>(),10));   // operation    PRINT_ELEMENTS(coll2,"transformed: ");    // Remove all elements with values less than 50    coll2.erase(remove_if(coll2.begin(),coll2.end(), // range                          bind2nd(less<int>(),50)),  // remove criterion                coll2.end());    PRINT_ELEMENTS(coll2,"removed:     ");}/* initialized: 9 8 7 6 5 4 3 2 1transformed: 90 80 70 60 50 40 30 20 10removed:     90 80 70 60 50 */