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^0 is interpreted as -1 #36578

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kstenerud opened this issue Jan 15, 2020 · 3 comments
Closed

^0 is interpreted as -1 #36578

kstenerud opened this issue Jan 15, 2020 · 3 comments
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@kstenerud
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What did you do?

https://play.golang.org/p/2kMDzm1vAtF

package main

import (
	"fmt"
)

func main() {
	var x uint64 = ^0
	fmt.Println(x)
}

What did you expect to see?

I expected it to print the highest uint64 value possible

What did you see instead?

./prog.go:8:17: constant -1 overflows uint64

The logical complement of 0 should not be assumed to be signed.
@bradfitz
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See https://blog.golang.org/constants

@randall77
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Use x := ^uint64(0) instead.

@minux
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minux commented Jan 15, 2020

Need to use ^uint64(0) as explained https://blog.golang.org/constants#TOC_11%2e

@minux minux closed this as completed Jan 15, 2020
@golang golang locked and limited conversation to collaborators Jan 14, 2021
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@bradfitz @minux @kstenerud @randall77 @gopherbot