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* Stuart Davies <sdd.dav...@gmail.com> [191015 07:24]: > 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. The append function should do exactly what you want, but you must use it properly. There is a good explanation of slices on the Go blog at «https://blog.golang.org/go-slices-usage-and-internals». The builtin append function will append to the existing backing array if there is enough capacity, but will allocate a new backing array if necessary. Because of this, it always returns the new slice, and you must use the returned slice, rather than the original. Here is a playground link demonstrating the use of append: «https://play.golang.org/p/5Pl16hN-T5u». ...Marvin -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/20191015115219.dca3mjcdj54qxslq%40basil.wdw.
