std::shared_ptr 和 std::vector 的结合使用

#include <iostream>
#include <string>
#include <vector>

std::shared_ptr<std::vector<std::string>> AssignValue() {
    std::vector<std::string> str_v1;
    std::string s1 = "hello";
    std::string s2 = "world";
    str_v1.push_back(s1);
    str_v1.push_back(s2);

    // std::make_shared 自动分配内存
    auto make_ptr_1 = std::make_shared<std::vector<std::string>>(str_v1);
    // 栈分配
    // std::shared_ptr<std::vector<std::string>>make_ptr_1(&str_v1);
    return make_ptr_1;
}


int main() {
    std::shared_ptr<std::vector<std::string>> make_ptr_2(AssignValue());
    // 效果一样
    // make_ptr_2 = AssignValue();

    auto count = make_ptr_2.get()->size();

    auto refer_num = make_ptr_2.use_count();

    /* 下面注释的代码看看就好
    std::vector<std::string> *copy_v2 = make_ptr_2.get();

    std::cout << copy_v2[0].data()[0] << std::endl;
    std::cout << copy_v2[0].data()[1] << std::endl;
    */

    for (int i = 0; i < count; i++) {
        std::cout << make_ptr_2 << std::endl;
        // 带不带 get() 都能返回指针地址 
        std::cout << make_ptr_2->data()[i].c_str() << std::endl;
        std::cout << make_ptr_2.get()->data()[i].c_str() << std::endl;
    }

    return 0;
}