iterator erase( const_iterator pos ) { return iterator(_cont.erase(pos._iter)); }
iterator erase( const_iterator first, const_iterator last ) { return iterator(_cont.erase(first._iter, last._iter)); }
#else
iterator erase( const_iterator pos ) { return iterator(_cont.erase(pos._iter)); }
iterator erase( const_iterator first, const_iterator last ) { return iterator(_cont.erase(first._iter, last._iter)); }
#else