Re: [Boost-users] Container with insertion order

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public:        V& operator[]( const K& key )          {            r = new mutable_pair(key,V());            c.insert(c.end(),*r);            return (*r).second;          } <..> I now correctly get two iterators, but in this class don't work the assignment: my output is: Joe - 0 Lillo - 0 Mary - 0

Of course, because insert() copies its parameter, so you actually return the ref to the original object while the container stores its copy (thus you also have a memory leak). The code should be as follows: V& operator[]( const K& key ) { c.insert(c.end(), mutable_pair(key,V())); return c.get<1>().find(key)->second; }