C++: What is the proper way of resizing a dynamically allocated array?

Question

In C, I would have done it using realloc.

In C++, one would normally consider using the STL vector class.

But how do I properly res

Answer 1

int* arr = new int[20];
...
//wanna resize to 25?
int* temp = new int[25];
std::copy(arr, arr+20, temp);
delete [] arr;
arr = temp;
... //now arr has 25 elements

But, of course, you shouldn't do this :)