I found the position of `[0]byte` in the struct matters.
type bar2 struct {
A int
_ [0]byte
}
differs from
type bar3 struct {
_ [0]byte
A int
}
see the full example <https://play.golang.org/p/wJkDPQ0PQ3>
On Wednesday, July 12, 2017 at 10:44:04 AM UTC+8, Rader wrote:
>
> they both have the same size, eg. following structs bar and bar2 both take
> 16 bytes memory on a x64 machine.
>
> package main
>
> import (
> "fmt"
> "unsafe"
> )
>
> type bar struct {
> A int
> _ bool
> }
>
> type bar2 struct {
> A int
> _ [0]byte
>
> }
>
> func main() {
> bar := bar{}
> bar2 := bar2{}
> fmt.Printf("size of bar:%v\n", unsafe.Sizeof(bar))
> fmt.Printf("size of bar2:%v\n", unsafe.Sizeof(bar2))
> }
>
>
>
> On Thursday, July 6, 2017 at 11:45:30 AM UTC+8, kortschak wrote:
>>
>> On Wed, 2017-07-05 at 17:26 -0700, rsr via golang-nuts wrote:
>> > type bar struct {
>> > A int
>> > _ bool
>> > }
>>
>>
>> or `type bar struct { A int; _ [0]byte }` to avoid the additional byte
>> use.
>>
>>
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