C++：如何在不定义参数化构造函数的情况下正确初始化基类成员变量？

#include <iostream>

class Base {
public:
    Base(int value) : baseValue(value) {
        std::cout << "Base constructor called" << std::endl;
    }

    void printValue() {
        std::cout << "Base value: " << baseValue << std::endl;
    }

private:
    int baseValue;
};

class Derived : public Base {
public:
    Derived(int baseValue, int derivedValue) : Base(baseValue), derivedValue(derivedValue) {
        std::cout << "Derived constructor called" << std::endl;
    }

    void printValue() {
        Base::printValue();
        std::cout << "Derived value: " << derivedValue << std::endl;
    }

private:
    int derivedValue;
};

int main() {
    Derived derived(10, 20);
    derived.printValue();

    return 0;
}

Base constructor called
Derived constructor called
Base value: 10
Derived value: 20