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/* 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 <iterator>
/* template class for insert iterator for associative containers
template <class Container>
class asso_insert_iterator
: public std::iterator <std::output_iterator_tag,
void, void, void, void>
Container& container; // container in which elements are inserted
// constructor
explicit asso_insert_iterator (Container& c) : container(c) {
// assignment operator
// - inserts a value into the container
operator= (const typename Container::value_type& value) {
return *this;
// dereferencing is a no-op that returns the iterator itself
asso_insert_iterator<Container>& operator* () {
return *this;
// increment operation is a no-op that returns the iterator itself
asso_insert_iterator<Container>& operator++ () {
return *this;
asso_insert_iterator<Container>& operator++ (int) {
return *this;
/* convenience function to create the inserter
template <class Container>
inline asso_insert_iterator<Container> asso_inserter (Container& c)
return asso_insert_iterator<Container>(c);