当函数返回时，C++向量实例即可操作

#include <iostream>
#include <vector>

std::vector<int> createVector() {
    std::vector<int> vec;
    vec.push_back(1);
    vec.push_back(2);
    vec.push_back(3);
    return vec;
}

int main() {
    std::vector<int> myVector = createVector();

    // 向量实例仍然可以进行操作
    myVector.push_back(4);
    myVector.pop_back();

    for (int i : myVector) {
        std::cout << i << " ";
    }
    std::cout << std::endl;

    return 0;
}