无法专门化std：：哈希以在unordered_map中存储自定义类型

#include <iostream>
#include <unordered_map>
#include <functional>

class Person {
public:
    std::string name;
    int age;

    Person(const std::string& n, int a) : name(n), age(a) {}
};

// 自定义哈希函数
struct PersonHash {
    std::size_t operator()(const Person& p) const {
        std::size_t h1 = std::hash<std::string>{}(p.name);
        std::size_t h2 = std::hash<int>{}(p.age);
        return h1 ^ h2;
    }
};

// 自定义相等比较函数
struct PersonEqual {
    bool operator()(const Person& p1, const Person& p2) const {
        return p1.name == p2.name && p1.age == p2.age;
    }
};

int main() {
    std::unordered_map<Person, std::string, PersonHash, PersonEqual> personMap;

    Person p1("Alice", 25);
    Person p2("Bob", 30);

    personMap[p1] = "Engineer";
    personMap[p2] = "Manager";

    std::cout << personMap[p1] << std::endl;  // 输出：Engineer
    std::cout << personMap[p2] << std::endl;  // 输出：Manager

    return 0;
}