Using std::set::erase with iterators

Hi,

  I do not understand how I am supposed to use erase when looping over
elements in a set, here is what I am trying to do (*). Could someone
please indicate how was I supposed to do it properly ? All I can think
of is something like this (very ***bersome):

    if( *it % 2 )
      {
      std::set<int>::const_iterator duplicate = it;
      ++it;
      s.erase( duplicate );
      }
    else
      {
      ++it;
      }


Thanks
-Mathieu

(*)
#include <set>
#include <iostream>

int main()
{
  std::set<int> s;
  for(int i =0; i < 10; ++i)
    {
    s.insert( i );
    }

  for( std::set<int>::const_iterator it = s.begin(); it != s.end(); +
+it)
    {
    if( *it % 2 )
      s.erase( it );
    }

  for( std::set<int>::const_iterator it = s.begin(); it != s.end(); +
+it)
    {
    std::cout << *it << std::endl;
    }

  return 0;
}