如何使用分配器改变向量值？

#include <vector>
#include <iostream>
#include <memory>

template <typename T>
class MyAllocator : public std::allocator<T> {
public:
    // 重载构造函数
    template <typename U>
    struct rebind {
        typedef MyAllocator<U> other;
    };

    // 重载allocate函数
    T* allocate(std::size_t n) {
        std::cout << "Allocating memory for " << n << " elements" << std::endl;
        return std::allocator<T>::allocate(n);
    }

    // 重载deallocate函数
    void deallocate(T* p, std::size_t n) {
        std::cout << "Deallocating memory for " << n << " elements" << std::endl;
        std::allocator<T>::deallocate(p, n);
    }
};

int main() {
    // 使用自定义分配器创建向量
    std::vector<int, MyAllocator<int>> myVector;

    // 添加元素到向量中
    myVector.push_back(10);
    myVector.push_back(20);
    myVector.push_back(30);

    // 使用迭代器遍历并修改向量中的值
    for (auto it = myVector.begin(); it != myVector.end(); ++it) {
        *it += 5;
    }

    // 输出修改后的向量值
    for (const auto& value : myVector) {
        std::cout << value << " ";
    }
    std::cout << std::endl;

    return 0;
}