Hello gopher's,
I have simple go program which convert slice of one type to slice of other
type using go generics for handling all the supported types.
Below is the code snippest for this:
package main
import "fmt"
import "unsafe"
type slice struct {
ptr unsafe.Pointer
len int
cap int
}
func Slice[To, From any](data []From) []To {
var zf From
var zt To
var s = (*slice)(unsafe.Pointer(&data))
s.len = int((uintptr(s.len) * unsafe.Sizeof(zf)) /
unsafe.Sizeof(zt))
s.cap = int((uintptr(s.cap) * unsafe.Sizeof(zf)) /
unsafe.Sizeof(zt))
x := ([]To)(unsafe.Pointer(s))
return x
}
func main() {
a := make([]uint32, 4, 13)
a[0] = 1
a[1] = 0
a[2] = 2
a[3] = 0
// 1 0 2 0
b := Slice[int64](a)
//Expecxted : []int64[]{0x00000000 00000001, 0x00000000 00000002}
//Got: []int64{0x00000001 00000000, 0x00000002 0000000}
if b[0] != 1 {
fmt.Printf("wrong value at index 0: want=1 got=0x%x \n",
b[0])
}
if b[1] != 2 {
fmt.Printf("wrong value at index 1: want=2 got=0x%x\n",
b[0])
}
}
This is working fine on little endian architectures(amd64,arm64 etc), but
when i run on big endian machine(s390x) it is not working , it is resulting
wrong data
//Expecxted : []int64[]{0x00000000 00000001, 0x00000000 00000002}
//Got: []int64{0x00000001 00000000, 0x00000002 0000000}
Can somepoint point me how do we write such scenario which should work on
both little/endian platforms.
Any leads on this?
Thanks,
Srinivas
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