Thanks Ian, that's a very interesting solution.
Is there a solution for going in the other direction? Although I excluded
it from the initial post, it was only to reduce the size of the discussion.
I would also like to implement
func BytesToString(b []byte) string {
I don't clearly see how to avoid using the StringHeader in this case.
F
On Wednesday, 18 September 2019 22:46:44 UTC+2, Ian Lance Taylor wrote:
>
> On Wed, Sep 18, 2019 at 2:42 AM Francis <francis...@gmail.com
> <javascript:>> wrote:
> >
> > I am looking at the correct way to convert from a byte slice to a string
> and back with no allocations. All very unsafe.
> >
> > I think these two cases are fairly symmetrical. So to simplify the
> discussion below I will only talk about converting from a string to []byte.
> >
> > func StringToBytes(s string) (b []byte)
>
> No reason to use SliceHeader, and avoiding SliceHeader avoids the
> problems you discuss.
>
> func StringToBytes(s string) []byte {
> const max = 0x7fff0000
> if len(s) > max {
> panic("string too long")
> }
> return
> (*[max]byte)(unsafe.Pointer((*reflect.StringHeader)(unsafe.Pointer(&s)).Data))[:len(s):len(s)]
>
>
> }
>
> Of course, as you say, you must not mutate the returned []byte.
>
> Ian
>
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