added iterators to IDSet; renamed remove() to erase()

git-svn-id: svn://anubis/anaglym/trunk@264 99a6e188-d820-4881-8870-2d33a10e2619

IDSet.h

@@ -15,7 +15,7 @@ class IDSet
             m_data[id] = o;
             return id;
         }
-        void remove(int id)
+        void erase(int id)
         {
             m_data.erase(id);
         }
@@ -27,6 +27,9 @@ class IDSet
         {
             return m_data.find(id) != m_data.end();
         }
+        bool empty() { return m_data.empty(); }
+        typename std::map<int, T>::iterator begin() { return m_data.begin(); }
+        typename std::map<int, T>::iterator end() { return m_data.end(); }
     protected:
         std::map<int, T> m_data;
         int m_next_index;