On Fri, 7 Dec 2018, 3:26 pm 'Bryan Mills' via golang-nuts <
golang-nuts@googlegroups.com wrote:
> On Monday, December 3, 2018 at 12:02:07 AM UTC-5, Ian Lance Taylor wrote:
>>
>> On Sat, Dec 1, 2018 at 9:39 AM <leeo...@gmail.com> wrote:
>> >
>> > I am using swig wrap a c++ module , the generated go code is like this:
>> >
>> > type MediaFrame interface {
>> > GetLength() uint
>> > GetData() (*byte)
>> > }
>> >
>> > I want to convert the *byte to []byte, How to do this?
>>
>> One approach is
>>
>> s :=
>> (*[1<<30]byte)(unsafe.Pointer(mf.GetData())[:mf.GetLength():mf.GetLength()]
>>
>> Ian
>>
>
> If you need to handle slices larger than 2³⁰ bytes, a more robust version
> of this same approach is described in
> https://golang.org/issue/13656#issuecomment-303216308.
>
>
Unfortunately this approach is vulnerable to a memory leak due to
https://golang.org/issue/28783 (and I suspect it will be quite a bit slower
too, if performance is important). I wonder if it might be better to use
reflect.SliceHeader guarded with some suitable regression checks.
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