Get the size of an struct array?

Hello,
how to get the item count of an array of structs?
For example:

Code:

---

struct intArr
{
int i;
int y;
}
intArr ar[10]; // here!

---

sizeof(ar) is wrong!?

thanks
break;

Quote:

---

Originally Posted by break;

Hello,
how to get the item count of an array of structs?
For example:

Code:

---

struct intArr
{
int i;
int y;
}
intArr ar[10]; // here!

---

sizeof(ar) is wrong!?

thanks
break;

---

Code:

---

sizeof(ar) / sizeof(ar[0]);

---

This only works if the code is placed where "ar" is really an array, not a pointer.

It will not work if you pass "ar"' to a function, and you attempt to get the number of elements from the passed in parameter. Passing an array to a function just passes a pointer, not the entire array.

Regards,

Paul McKenzie

Hello,
thanks for your help!

regards
break;

[ Moved thread ]

I like this method better:

Code:

---

sizeof(ar) / sizeof(intArr)

---

Or you could use the Standard Template Library

Code:

---

#include <vector>

struct intArr
{
int i;
int y;
}

std::vector<intArr> ar(10);

std::vector<intArr>::size_type size = ar.size();

---

Quote:

---

Originally Posted by spoulson

I like this method better:

Code:

---

sizeof(ar) / sizeof(intArr)

---

---

Actually, I think that form is more confusing. Dividing the size of the entire array by the size of the first element is more intuitive.

My $0.02..

Viggy