How can I delete elements of a std::map with an iterator?

Question

I would like to loop through an std::map and delete items based on their contents. How best would this be done?

Answer 1

This is one simple way:

    int value_to_delete( 2 );
    for( std::map::iterator i = mm.begin(); i != mm.end(); ) {
        if( i->second != value_to_delete ) {
            mm.erase( i++ ); // advance before iterator become invalid
        }
        else {
            ++i;
        }
    }