这个包含可变大小数组的C++类是否使用动态内存分配？

#include<iostream>

class DynamicArray {
public:
    DynamicArray(int size) {
        data = new int[size];
        this->size = size;
    }

    ~DynamicArray() {
        delete[] data;
    }

    void resize(int newSize) {
        int* newData = new int[newSize];
        for (int i = 0; i < std::min(size, newSize); i++) {
            newData[i] = data[i];
        }
        delete[] data;
        data = newData;
        size = newSize;
    }

    int& operator[](int index) {
        return data[index];
    }

    int size;
private:
    int* data;
};

int main() {
    DynamicArray array(5);
    for (int i = 0; i< array.size; i++) {
        array[i] = i;
    }

    array.resize(10);
    for (int i = 0; i< array.size; i++) {
        std::cout<< array[i] << " ";
    }

    array.resize(3);
    for (int i = 0; i< array.size; i++) {
        std::cout<< array[i] << " ";
    }

    return 0;
}