## digitalmars.D.learn - Arrray sizeof

• RenatoL (9/9) Dec 24 2011 snippet:
• Mr. Anonymous (5/14) Dec 24 2011 8 is the size of the int[] type, which contains two pointers (or a
• Regan Heath (12/21) Dec 28 2011 It's a quirk of D that int[] is a reference type, so you get the size of...
RenatoL <rexlen gmail.com> writes:
```snippet:

int[] arr1 = [1,2,3,4,5];
int[5] arr2 = [1,2,3,4,5];
writeln(arr1.sizeof);
writeln(arr2.sizeof);

Output:
8
20

"0 is ok to me but why "8"??
```
Dec 24 2011
"Mr. Anonymous" <mailnew4ster gmail.com> writes:
```On 24.12.2011 18:46, RenatoL wrote:
snippet:

int[] arr1 = [1,2,3,4,5];
int[5] arr2 = [1,2,3,4,5];
writeln(arr1.sizeof);
writeln(arr2.sizeof);

Output:
8
20

"0 is ok to me but why "8"??

8 is the size of the int[] type, which contains two pointers (or a
pointer and a size).
To get 20, you can use:
arr1[0].sizeof * arr1.length
```
Dec 24 2011
"Regan Heath" <regan netmail.co.nz> writes:
```On Sat, 24 Dec 2011 16:46:18 -0000, RenatoL <rexlen gmail.com> wrote:

snippet:

int[] arr1 = [1,2,3,4,5];
int[5] arr2 = [1,2,3,4,5];
writeln(arr1.sizeof);
writeln(arr2.sizeof);

Output:
8
20

"0 is ok to me but why "8"??

It's a quirk of D that int[] is a reference type, so you get the size of
the reference (as My Anonymous said, a length and pointer) whereas int[5]
is a value type, so you get the size of the value.

It's the same as the following C..

int *arr1;
int arr2[5];

printf("%d\n", sizeof(arr1));
printf("%d\n", sizeof(arr2));

R

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```
Dec 28 2011