How to expand an array dynamically in C++? {like in vector }


Question

Lets say, i have

int *p;
p = new int[5];
for(int i=0;i<5;i++)
   *(p+i)=i;

Now I want to add a 6th element to the array. How do I do it?

1
12
8/29/2009 6:20:41 AM

You have to reallocate the array and copy the data:

int *p;
p = new int[5];
for(int i=0;i<5;i++)
   *(p+i)=i;

// realloc
int* temp = new int[6];
std::copy(p, p + 5, temp); // Suggested by comments from Nick and Bojan
delete [] p;
p = temp;
25
3/26/2013 10:35:23 AM

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