Thanks.
The copy command was the thing I missed. It does exactly what I need and I
can control the extension of the backing array with fine detail.
I assume the copy command is implemented efficiently but even if it just
loops it is a packaged process and will have been optomised by the Go devs
so it is as good as I am likly to get.
Thanks all for your help :-)
On Tuesday, 15 October 2019 11:16:35 UTC+1, Stuart Davies wrote:
>
> Hi
>
> I have a slice backed by an array.
>
> My understanding is that I can extend the slice (append) up to the
> capacity of the array.
>
> After that I do not understand the correct procedure. Append fails when
> the backing array indexes are exceeded.
>
> So I have this temporary piece of code:
> if p.LineCount >= len(p.Offsets) {
> newLen := p.LineCount + 50
> sb := make([]int64, newLen)
> for i := 0; i < p.LineCount; i++ {
> sb[i] = p.Offsets[i]
> }
> p.Offsets = sb
> }
>
> I know there must be an array copy function that will do this more
> efficiently but I failed to find it!
>
> Please help.
>
>
>
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