如何将具有字符串数据成员的类的对象传递给C++中的另一个类

class SourceClass {
public:
    std::string data;
};

class TargetClass {
public:
    TargetClass(const SourceClass& source) {
        data = source.data;
    }

    std::string data;
};

int main() {
    SourceClass source;
    source.data = "Hello, World!";

    TargetClass target(source);
    std::cout << target.data << std::endl;  // 输出：Hello, World!

    return 0;
}

class SourceClass {
public:
    std::string data;
};

class TargetClass {
public:
    void setData(const SourceClass& source) {
        data = source.data;
    }

    std::string data;
};

int main() {
    SourceClass source;
    source.data = "Hello, World!";

    TargetClass target;
    target.setData(source);
    std::cout << target.data << std::endl;  // 输出：Hello, World!

    return 0;
}

class SourceClass {
public:
    std::string data;
};

class TargetClass {
public:
    SourceClass source;
};

int main() {
    SourceClass source;
    source.data = "Hello, World!";

    TargetClass target;
    target.source = source;
    std::cout << target.source.data << std::endl;  // 输出：Hello, World!

    return 0;
}