How to dynamically allocate an array of pointers in C++?

问题:

I have the following class

class Node {     int key;     Node**Nptr; public:     Node(int maxsize,int k); }; Node::Node(int maxsize,int k) {    //here i want to dynamically allocate the array of pointers of maxsize    key=k; }

Please tell me how I can dynamically allocate an array of pointers in the constructor -- the size of this array would be maxsize.

回答1:

Node::Node(int maxsize,int k) {    NPtr = new Node*[maxsize]; }

But as usual, you are probably better off using a std::vector of pointers.

回答2:

That will be Nptr = new Node*[maxsize]; Also, remember to use delete[] in destructor.

回答3:

Suppose you want to create matrix of 3 rows and 4 cols then,

int **arr = new int * [3];  //first allocate array of row pointers  for(int i=0 ; i<rows ; ++i) {    arr[i] = new int[4]; // allocate memory for columns in each row }

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