Offsetting zero index in Golang slice

Question

In C, we can move pointer like so:

int main()
{
    int array[4] = { 1, 2, 3, 4};
    int *q;
    q = array; 
    printf("%d\n", q[0]); /* 1 */
    q += 3; 
    printf("%d\n", q[0]); /* 4 */
}

Is there a way to do something like this in Golang?

See https://golang.org/ref/spec#Slice_types - it's not at all the same, but now that the question is already closed, there's no way to add a proper description of using slices to get the effect you want. — torek, Dec 08 '19 at 08:29
@PumpkinSeed: what the OP might want is: `q := arr[:]` followed by `q = q[3:]`. See also https://stackoverflow.com/q/29110426/1256452 — torek, Dec 08 '19 at 08:31

score 3 · Answer 1 · answered Dec 08 '19 at 08:20

3

Golang does not support pointer arithmetic since that is a source of vulnerabilities.

References: https://tour.golang.org/moretypes/1

answered Dec 08 '19 at 08:20

pr-pal

3,248
26
18

score 1 · Answer 2 · answered Dec 08 '19 at 08:22

1

Golang does not support pointer arithmetic in order to increase the safety during development.

answered Dec 08 '19 at 08:22

alessiosavi

2,753
2
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38

score 1 · Answer 3 · answered Dec 08 '19 at 12:42

For example, using Go slices,

package main

import "fmt"

func main() {
    array := [4]int{1, 2, 3, 4}
    slice := array[:]
    fmt.Printf("%d\n", slice[0]) /* 1 */
    slice = slice[3:]
    fmt.Printf("%d\n", slice[0]) /* 4 */
}

Playground: https://play.golang.org/p/82pXFkHLSfd

Output:

1
4

Offsetting zero index in Golang slice

3 Answers3