operator>

template<class Key, class T, class Pred, class A>
    bool operator>(
        const map <Key, T, Pred, A>& lhs,
        const map <Key, T, Pred, A>& rhs);
template<class Key, class T, class Pred, class A>
    bool operator>(
        const multimap <Key, T, Pred, A>& lhs,
        const multimap <Key, T, Pred, A>& rhs);