#include #include class DynamicVector { private: int * array_ = nullptr; int size_ = 0; int capacity_ = 0; public: DynamicVector(int * array, const int & size); DynamicVector(const DynamicVector & x); DynamicVector& operator=(DynamicVector x); ~DynamicVector(); int & at(int index); void reserve(int capacity); int * data(); int capacity(); int size(); void push_back(const int & x); }; DynamicVector::DynamicVector(int * array, const int & size){ array_ = new int[size]; size_ = size; for (int i = 0; i < size; i++){ array_[i] = array[i]; } capacity_ = size; } DynamicVector::DynamicVector(const DynamicVector &x) { this->size_=x.size_; array_= new int[size_]; for(int i=0;i capacity_){ int *temp = new int[capacity]; for(int i = 0; i < capacity_;i++) { temp[i] = array_[i]; } capacity_ = capacity; array_ = temp; } } void DynamicVector::push_back(const int &x) { if(size_ >= capacity_){ reserve(capacity_*2); } array_[size_] = x; size_++; } int & DynamicVector::at(int index){ if (index < size_){ return array_[index]; } } DynamicVector &DynamicVector::operator=(DynamicVector x) { this->size_=x.size_; array_=new int[size_]; for(int i=0;iarray_; } int main(){ const int size = 3; int * array = new int [size] {1, 4, 7}; DynamicVector dv(array, size); int & result = dv.at(0); dv.at(0) = result = 99; std::cout << dv.at(0) << std::endl; // 99 std::cout << array[0] << std::endl; // 99 }

not updating the array