重载自增++运算符预算符完成数组扩容

今天突发奇想,我们平时的++运算符基本都只能自增数字,那我能不能实现一个当用户自增数组时也能完成数组增加一项呢(假设你不会使用c++的变长数组或者vector!)下面就是我的实现方法,各位大佬多多指教哦!比如说gyf大佬和yzs大佬以及lxb大佬?

// 重载++运算符扩容数组

#include <iostream>
class DynamicArray
{
private:
    int size;
    int *array;

public:
    DynamicArray(int size = 1);
    void resize(int newSize);
    int &operator[](int index);
    DynamicArray &operator++()
    {
        resize(size + 1);
        return *this;
    }
    int getsize(DynamicArray &array);
};
DynamicArray::DynamicArray(int size)
{
    this->size = size;
    array = new int[size];
}
void DynamicArray::resize(int newSize)
{
    int *newArray = new int[newSize];
    for (int index = 0; index < newSize; index++)
    {
        newArray[index] = array[index];
    }
    delete[] array;
    array = newArray;
    size = newSize;
}

int &DynamicArray::operator[](int index)
{
    return array[index];
}
int DynamicArray::getsize(DynamicArray &array)
{
    return array.size;
}
int main()
{
    int size = 0;
    std::cout << "Please input your size:";
    std::cin >> size;
    DynamicArray array(size);
    for (int index = 0; index < size; index++)
    {
        std::cin >> array[index];
    }
    ++array;
    std::cout << "Please input your " << array.getsize(array) << "-th element:";
    std::cin >> array[array.getsize(array) - 1];
    for (int index = 0; index < array.getsize(array); index++)
    {
        std::cout << index + 1 << "-th element:" << array[index] << std::endl;
    }
    return 0;
}