Get the size of an struct array?

[break;]

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

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

sizeof(ar) is wrong!?

thanks
break;

[Paul McKenzie]

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

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

sizeof(ar) is wrong!?

thanks
break;

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

[break;]

Hello,
thanks for your help!

regards
break;

[ovidiucucu]

[ Moved thread ]

[spoulson]

I like this method better:

sizeof(ar) / sizeof(intArr)

[JohnW@Wessex]

Or you could use the Standard Template Library

#include <vector>

struct intArr
{
int i;
int y;
}

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

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

[MrViggy]

I like this method better:

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