On Wednesday, August 7, 2019 at 4:21:03 AM UTC-4, Jan Mercl wrote:
>
> On Wed, Aug 7, 2019 at 3:17 AM hui zhang <fastf...@gmail.com <javascript:>>
> wrote:
>
> > //export Send
> > func Send(confid string, len int, pcm *C.short) {
> > //put c.short array to int16 slice/array efficiently , how ?
> > // memcopy ?
> > }
>
> s := (*[^uint(0) >> 1]int16)(unsafe.Pointer(pcm))[:len] // s is
> []int16, len(s) = len
>
That constant doesn't always work.
(See https://golang.org/issue/13656#issuecomment-165858089.)
If you have a static upper bound on the size of the array, then it's fine
to use whatever that bound is, but if you don't then you generally need a
more dynamic calculation (like the one
in https://golang.org/issue/13656#issuecomment-303216308).
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