public int IndexOf( object obj )
{
if ( obj == null )
return -1;
Type type = obj.GetType();
for ( int i = 0; i < m_Types.Length; ++i )
{
Type[] group = m_Types[i];
bool contains = false;
for ( int j = 0; !contains && j < group.Length; ++j )
contains = group[j].IsAssignableFrom( type );
if ( contains )
return i;
}
return -1;
}