On Wednesday, November 13, 2019 at 3:22:56 PM UTC-5, Brian Candler wrote: > > > the current implementation of interfaces is that they always store > pointer > > values. If you store a non-pointer value in an interface, that value > > is copied into memory, and a pointer to that memory is stored in the > > interface. > > I don't understand where you say "that value is copied into memory". If > we're talking about a value that already exists, surely it just obtains a > pointer to it, without any copying? > I don't think it does, and that would not even be possible. If it did just use a pointer to the original value then modifications to the original would be reflected in the interface. If the interface holds a value, not a pointer, then that would be very unexpected. I think this code https://play.golang.org/p/9H4AFIGy-1I illustrates that a copy is indeed made when a interface holds a value.
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