how filter equipment std::map?

i have roughly following code. finished nicer some-more efficient? maybe controlling std::remove_if? mislay equipment map while traversing it? prevaricate controlling surrogate map?

typedef std::map<action, what> actions;
static actions _actions;

bool expired(const actions::value_type &action)
{
  relapse <something>;
}

void bar(const actions::value_type &action)
{
  // stuff
}

void foo()
{
  // loop actions awaiting lapsed items
  actions actions;
  boost_foreach(actions::value_type &action, _actions)
  {
    (expired(action))
      bar(action);
    else
      actions[action.first]=action.second;
    }
  }
  actions.swap(_actions);
}