XZL_problem.cpp

#include <string>
#include <unordered_map>
#include <string>
#include <iostream>
class Base {
public:
    Base() :testMap{ {"a",1}, {"b", 2}, {"c", 3}, {"d", 4} } {
    }
    virtual ~Base() = default;
    void display() {
        for (auto &w : testMap) {
            std::cout << w.first << ' ';
            std::cout << w.second << std::endl;
        }
    }
protected:
    std::unordered_map<std::string, int> testMap;
};

class unBase : public Base {
public:
    unBase() {
        testMap["a"] = 10;
    }
};

int main() {
    unBase test;
    test.display();

    return 0;
}