Why not use struct{}? Is what is recommended for maps to notate a set
(only the keys mean something).
https://play.golang.org/p/fxtEWejqdh
On Tue, Jul 11, 2017, 11:34 PM Rader <rader....@gmail.com> wrote:
> 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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