My goal is to contain a list of integers that may extend to possibly a
couple of thousand entries. Initial size is 100. Extensions add 50 entries
at a time.
I declared the array initially with:
make([]int64, 100).
I tried using the Append function but could not Append past the 100
entries. The 101 entry threw a panic so I detirmined to extend the array
myself.
I would have thought Append should extend if required but it did not (or am
I using it incorrectly). I looked at some other code examples but could not
find a solution.
In C there is an array copy function that is implemented by the processor
directly, it's been a long time since I used C and assembler but I rememer
there were non overlapping mem copy instructions that would make an array
copy very fast.
Is there somthing similar in GO.
This is a general question, it is not really specific to my application. I
just want to know the best practices for 'extending' an array of arbitrary
type.
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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