Dynamically Allocated Arrays of Objects

[bsuribabu]

Hi,

Please pls look at this code.

#include <iostream>
using namespace std;

int main()
{
int *pi;
pi = new int[5];
pi++;
delete[] pi;
}

can i do like this ?
What are the consequences for this stub.

Suri

 

[Zyrenthian]

NO... this will cause problems, here is why

int* pi; // declare a pointer to an int
pi = new int[5]; // pi points to an array of 5 ints

// ok here lets say that pi's memory address is 123

pi++; // pointer arithmetic, pi now points to 124

delete[] pi;

// this call to delete will delete starting at 124 and NOT 123

Matt

 

[FloViel]

Well, the consequence for this &quot;stub&quot; is that your programm will crash. Simply said.

As Matt already said, delete will begin deleting at (pseudo) address 124 and it tries to delete 5 &quot;ints&quot;.
This causes a memory error, which leads to the crash.

Greetings,
Flo