C++class中unordered_set成员变量，编译时出错，怎么解决

Question

class Graph
{
public:
    unordered_map<int, Node> nodes;
    unordered_set<Edge> edges;
};

编译时出错

error C2280: “std::_Uhash_compare<_Kty,_Hasher,_Keyeq>::_Uhash_compare(const std::_Uhash_compare<_Kty,_Hasher,_Keyeq> &)”: 尝试引用已删除的函数
1>        with
1>        [
1>            _Kty=Edge,
1>            _Hasher=std::hash<Edge>,
1>            _Keyeq=std::equal_to<Edge>
1>        ]

Answer 1

试试 重载Edge的operator==,或者operator>