On Fri, Nov 30, 2018 at 6:16 PM Mark Volkmann <r.mark.volkm...@gmail.com>
wrote:
> Will the Go compiler optimize the pointer dereference so it doesn't
happen in every loop iteration? If not, is it common practice to do that
outside the loop like this?
>
> myValue := *myPtr
> for _, v := range values {
> fmt.Printf("%v %v\n", myValue, v)
> }
There's no pointer dereference inside the loop. But there's an allocation
inside the loop, on every iteration, that puts a pointer to a copy of
myValue into an interface{} that's passed to fmt.Printf. The allocation can
be probably avoided:
myValue := interface{}(*myPtr)
for _, v := range values {
fmt.Printf("%v %v\n", myValue, v)
}
But the %v verb handle pointers in many cases well. If that holds for the
type of *myPtr then simply:
for _, v := range values {
fmt.Printf("%v %v\n", myPtr, v)
}
is what could be good enough.
--
-j
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