sure you can. no memory space difference.
On Wednesday, July 12, 2017 at 7:44:47 PM UTC+8, Matthew Zimmerman wrote:
>
> 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 <rade...@gmail.com <javascript:>>
> 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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>
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