Question

I try to swap 2 dynamic allocated array that have different capacity. I try to use:

int *temp = arr1;
int arr1 = arr2;
int arr2 = temp;

However this approach doesn’t work. So I try different approach:

ItemType *temparr1 = new ItemType[other.capacity];
std::copy(setMember, setMember+capacity, temparr1);
ItemType *temparr2 = new ItemType[this->capacity];
std::copy(setMember, setMember+capacity, temparr2);
delete [] this->setMember;
delete [] other.setMember;
other.setMember = temparr1;
this->setMember = temparr2;

Unfortunately, this approach cast an error message :”Windows has triggered a breakpoint in Hw1.exe.

This may be due to a corruption of the heap, which indicates a bug in Hw1.exe or any of the DLLs it has loaded.”

any idea how can I swap dynamic allocated array? thx

Answer 1

You can’t swap the memory because it’s not the same size (assuming other.capacity is different than this->capacity – if it was, you wouldn’t get the runtime error).

Use std::vector instead.

If you just want to swap what the pointers point to:

int *temp = arr1;
arr1 = arr2;
arr2 = temp;

or

std::swap(arr1, arr2);

Again, note that these won’t swap the actual memory, but the values of the pointers.

Observe the missing int declarations which you initially had.