如何在map中存储缓冲区的值，而不是它的引用？

#include <iostream>
#include <map>
#include <vector>

int main() {
    std::map<int, std::vector<int>> myMap;

    std::vector<int> buffer;
    buffer.push_back(1);
    buffer.push_back(2);
    buffer.push_back(3);

    myMap[0] = buffer; // 将缓冲区作为值存储在map中

    buffer.clear(); // 清空缓冲区

    // 输出map中存储的值
    for (const auto& pair : myMap) {
        std::cout << "Key: " << pair.first << std::endl;
        std::cout << "Values: ";
        for (const auto& value : pair.second) {
            std::cout << value << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}