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- // +build go1.9
- // "go1.9", from Go version 1.9 onward
- // See https://golang.org/pkg/go/build/#hdr-Build_Constraints
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- package roaring
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- import "math/bits"
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- func popcount(x uint64) uint64 {
- return uint64(bits.OnesCount64(x))
- }
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