#include <cassert>
#include <iostream>

using namespace std;
#include <initializer_list>

class IntArray {
    unsigned mLength = 0;
    int *mData = nullptr;

public:
    IntArray(unsigned length) : mLength(length) { mData = new int[length]; }
    ~IntArray() { delete[] this->mData; }
    IntArray(const std::initializer_list<int> &list) : IntArray(list.size()) {
        int count = 0;
        for (auto &e : list) {
            mData[count] = e;
            ++count;
        }
    }

    friend ostream &operator<<(ostream &os, IntArray &arr) {
        for (unsigned i = 0; i < arr.mLength; ++i) {
            os << arr.mData[i] << " ";
        }
        os << endl;
        return os;
    }

    //=operator
    IntArray &operator=(const std::initializer_list<int> &array) {
        delete[] mData;
        mLength = array.size();
        if (mData != nullptr) {
            // mData = new int[mLength+1];
            cout << "mLength is " << mLength << endl;
            mData = new int[mLength];
            int i{};
            for (auto &e : array) {
                mData[i++] = e;
                // There's a buffer overrun due to this line
                // so i change
                // mData = new int[mLength]; to mData = new int[mLength+1];
                // Is this bad?
                // Let me know if there's another better way.
            }
        } else {
            mData = nullptr;
        }
        return *this;
    }
};

int main() {
    IntArray intArray = {11, 12, 13, 14, 15, 16, 17, 18, 19, 20};
    intArray = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    cout << intArray << endl;
}

缓冲区溢出问题一直困扰着我。编码大师mData[i++] = e;因为这一行，缓冲区溢出了。它比数组的索引大，对吧？所以我把这一行改为emData = new int[mLength];转换为mData =新整数[mLength+1];这样不好吗？如果有更好的方法，请告诉我。编程太难了...你们都是天才？