Re: [go-nuts] Re: Are the two unsafe uses safe?

['Axel Wagner' via golang-nuts]

On Sun, Feb 28, 2021 at 9:09 AM tapi...@gmail.com 
wrote:

> Is this error essential?
>

Yes. You need to be able to do arithmetic on addresses to use an array, but
for that they need to have a known type and size. By exceeding the address
space, you are creating a type that the compiler can't work with - that is,
it can't allow you to create that type, because it wouldn't know how to use
it.


>
> On Saturday, February 27, 2021 at 11:00:26 PM UTC-5 tapi...@gmail.com
> wrote:
>
>> 1.
>>
>> func String2ByteSlice(s string) []byte {
>> return (*[^uint(0) >> 1]byte)(unsafe.Pointer(&s))[:len(s):len(s)]
>> }
>>
>> 2.
>>
>> func String2ByteSlice(s string) []byte {
>> return *(*[]byte)(unsafe.Pointer(&struct{string; int}{s, len(s)}))
>> }
>>
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> .
>

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[go-nuts] Re: Are the two unsafe uses safe?

[tapi...@gmail.com]

Sorry, the first one will get a "type [9223372036854775807]byte larger than 
address space" error.
The following code will get the same error

var x *[^uint(0) >> 1]byte

Is this error essential?

On Saturday, February 27, 2021 at 11:00:26 PM UTC-5 tapi...@gmail.com wrote:

> 1.
>
> func String2ByteSlice(s string) []byte {
> return (*[^uint(0) >> 1]byte)(unsafe.Pointer(&s))[:len(s):len(s)]
> }
>
> 2.
>
> func String2ByteSlice(s string) []byte {
> return *(*[]byte)(unsafe.Pointer(&struct{string; int}{s, len(s)}))
> }
>

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