Thanks Val. I actually did a search before posting this and turned up many of those same links, but it seems like they're all just reasoning from the immutability of strings, which I don't think is quite sufficient to answer the question in all cases. Anyway, thanks for your help and I think for now I'll work on the assumption that string/byteslice conversions do always copy.
On Mon, Feb 13, 2017 at 2:22 PM Val <delepl...@gmail.com> wrote: > Hello Alex, > good point. I remember this has indeed come up in discussions in this > forum. > > Searching "byte slice string copy" gave (among others) [1] [2] [3] [4] [5] > [6] [7]. All of these look related to the suggested optimization "don't > allocate© for a []byte to string, or string to []byte, conversion, > under certain circumstances". > Cheers > Val > > [1] > https://groups.google.com/forum/#!searchin/golang-nuts/byte$20slice$20string$20copy|sort:relevance/golang-nuts/m46jaS6bgZg/R5hSOPFz5m0J > [2] > https://groups.google.com/forum/#!searchin/golang-nuts/byte$20slice$20string$20copy|sort:relevance/golang-nuts/CwoKDOhv6vw/sf35VZOZDQAJ > [3] > https://groups.google.com/forum/#!searchin/golang-nuts/byte$20slice$20string$20copy|sort:relevance/golang-nuts/ENgbUzYvCuU/gWa8V8wGAwAJ > [4] > https://groups.google.com/forum/#!searchin/golang-nuts/byte$20slice$20string$20copy|sort:relevance/golang-nuts/ajXzEM6lqJI/vRsqXxizBAAJ > [5] > https://groups.google.com/forum/#!searchin/golang-nuts/byte$20slice$20string$20copy|sort:relevance/golang-nuts/f2cX-BIJsqY/bzK77xpU8PMJ > [6] > https://groups.google.com/forum/#!searchin/golang-nuts/byte$20slice$20string$20copy|sort:relevance/golang-nuts/IfILC-wllaI/U8v88T3aBgAJ > [7] > https://groups.google.com/forum/#!searchin/golang-nuts/byte$20slice$20string$20copy|sort:relevance/golang-nuts/fXmG83gZOJg/eixtKSQiNysJ > > > On Monday, February 13, 2017 at 9:31:06 PM UTC+1, Alex Flint wrote: > > As of go1.8, do conversions between strings and byte slices always > generate a copy? > > I understand the immutability guarantees in the language spec, but I'm > interested in this from an efficiency standpoint. I can imagine a compiler > that analyzes whether a byte slice created from such a conversion is ever > modified and foregoing the copy in some cases, while still adhering to the > immutability guarantees. > > I have searched this forum for a past thread on this topic but have come > up empty. Feel free to point me to the relevant discussion. > > -- > You received this message because you are subscribed to a topic in the > Google Groups "golang-nuts" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/golang-nuts/C6BBNTRSEwg/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- 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. For more options, visit https://groups.google.com/d/optout.
