如何打印std::stack的内容并返回其大小？

#include <iostream>
#include <stack>
#include <vector>

template <typename T>
void printStack(std::stack<T>& s) {
    std::vector<T> temp;
    size_t size = s.size();
    while (!s.empty()) {
        temp.push_back(s.top());
        s.pop();
    }
    std::cout << "Stack size: " << size << std::endl;
    std::cout << "Stack contents: ";
    for (auto it = temp.rbegin(); it != temp.rend(); ++it) {
        std::cout << *it << " ";
    }
    std::cout << std::endl;
    // Restore the stack
    for (auto it = temp.rbegin(); it != temp.rend(); ++it) {
        s.push(*it);
    }
}

int main() {
    std::stack<int> s;
    s.push(1);
    s.push(2);
    s.push(3);
    printStack(s);
    return 0;
}