如何在C++中编写整数和普通类型之间的双向映射？

#include <iostream>
#include <map>

int main() {
    std::map<int, std::string> intToStrMap;
    std::map<std::string, int> strToIntMap;

    // 添加映射关系
    intToStrMap[1] = "one";
    intToStrMap[2] = "two";
    intToStrMap[3] = "three";

    // 反向迭代器添加映射关系
    for (const auto& pair : intToStrMap) {
        strToIntMap[pair.second] = pair.first;
    }

    // 使用映射关系
    std::cout << intToStrMap[2] << std::endl;  // 输出: "two"
    std::cout << strToIntMap["three"] << std::endl;  // 输出: 3

    return 0;
}

#include <iostream>
#include <unordered_map>

int main() {
    std::unordered_map<int, std::string> intToStrMap;
    std::unordered_map<std::string, int> strToIntMap;

    // 添加映射关系
    intToStrMap[1] = "one";
    intToStrMap[2] = "two";
    intToStrMap[3] = "three";

    // 遍历unordered_map添加映射关系
    for (const auto& pair : intToStrMap) {
        strToIntMap[pair.second] = pair.first;
    }

    // 使用映射关系
    std::cout << intToStrMap[2] << std::endl;  // 输出: "two"
    std::cout << strToIntMap["three"] << std::endl;  // 输出: 3

    return 0;
}