iterator adapter to iterate just the values in a map?

Question

I\'m just getting back into C++ after a couple of years of doing a lot of C#, and recently Objective C.

One thing I\'ve done before is to roll my own iterator adapte

Answer 1

I don't think there's anything out of the box. You can use boost::make_transform.

template T2& take_second(const std::pair &a_pair) 
{
  return a_pair.second;
}

void run_map_value()
{
  map a_map;
  a_map[0] = "zero";
  a_map[1] = "one";
  a_map[2] = "two";
  copy( boost::make_transform_iterator(a_map.begin(), take_second),
    boost::make_transform_iterator(a_map.end(), take_second),
    ostream_iterator(cout, "\n")
    );
}