如何在其中构造一个带有成员函数的deque类？C++

#include <iostream>
#include <deque>

class MyDeque {
private:
    std::deque<int> deque;

public:
    void pushFront(int value) {
        deque.push_front(value);
    }

    void pushBack(int value) {
        deque.push_back(value);
    }

    void popFront() {
        if (!deque.empty()) {
            deque.pop_front();
        }
    }

    void popBack() {
        if (!deque.empty()) {
            deque.pop_back();
        }
    }

    int front() {
        if (!deque.empty()) {
            return deque.front();
        }
        return -1; // 返回一个默认值，表示deque为空
    }

    int back() {
        if (!deque.empty()) {
            return deque.back();
        }
        return -1; // 返回一个默认值，表示deque为空
    }

    bool empty() {
        return deque.empty();
    }

    int size() {
        return deque.size();
    }
};

int main() {
    MyDeque myDeque;
    myDeque.pushBack(1);
    myDeque.pushBack(2);
    myDeque.pushFront(3);

    std::cout << "Front: " << myDeque.front() << std::endl;
    std::cout << "Back: " << myDeque.back() << std::endl;
    std::cout << "Size: " << myDeque.size() << std::endl;

    myDeque.popFront();
    myDeque.popBack();

    std::cout << "Front: " << myDeque.front() << std::endl;
    std::cout << "Back: " << myDeque.back() << std::endl;
    std::cout << "Size: " << myDeque.size() << std::endl;

    return 0;
}