如何为不允许修改数据的shared_ptrs容器编写getter

#include <iostream>
#include <memory>
#include <vector>

class Data {
public:
    Data(int value) : m_value(value) {}

    int getValue() const {
        return m_value;
    }

private:
    int m_value;
};

class Container {
public:
    void addData(std::shared_ptr<Data> data) {
        m_data.push_back(data);
    }

    const std::vector<std::shared_ptr<Data>>& getData() const {
        return m_data;
    }

private:
    std::vector<std::shared_ptr<Data>> m_data;
};

int main() {
    Container container;
    container.addData(std::make_shared<Data>(1));
    container.addData(std::make_shared<Data>(2));
    container.addData(std::make_shared<Data>(3));

    const std::vector<std::shared_ptr<Data>>& data = container.getData();
    for (const auto& ptr : data) {
        std::cout << ptr->getValue() << std::endl;
    }

    return 0;
}