How to resize array in C++?

Question

I need to do the equivalent of the following C# code in C++

Array.Resize(ref A, A.Length - 1); 

How to achieve this in C++?

Answer 1

You cannot resize array, you can only allocate new one (with a bigger size) and copy old array's contents. If you don't want to use std::vector (for some reason) here is the code to it:

int size = 10; int* arr = new int[size];  void resize() {     size_t newSize = size * 2;     int* newArr = new int[newSize];      memcpy( newArr, arr, size * sizeof(int) );      size = newSize;     delete [] arr;     arr = newArr; } 

code is from here http://www.cplusplus.com/forum/general/11111/.