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Package bits

import "math/bits"
Overview
Index
Examples

Overview ▾

Package bits implements bit counting and manipulation functions for the predeclared unsigned integer types.

Constants

UintSize is the size of a uint in bits.

const UintSize = uintSize

func LeadingZeros

func LeadingZeros(x uint) int

LeadingZeros returns the number of leading zero bits in x; the result is UintSize for x == 0.

func LeadingZeros16

func LeadingZeros16(x uint16) int

LeadingZeros16 returns the number of leading zero bits in x; the result is 16 for x == 0.

Example

16
15
7
0

func LeadingZeros32

func LeadingZeros32(x uint32) int

LeadingZeros32 returns the number of leading zero bits in x; the result is 32 for x == 0.

Example

32
31

func LeadingZeros64

func LeadingZeros64(x uint64) int

LeadingZeros64 returns the number of leading zero bits in x; the result is 64 for x == 0.

Example

64
63

func LeadingZeros8

func LeadingZeros8(x uint8) int

LeadingZeros8 returns the number of leading zero bits in x; the result is 8 for x == 0.

func Len

func Len(x uint) int

Len returns the minimum number of bits required to represent x; the result is 0 for x == 0.

func Len16

func Len16(x uint16) (n int)

Len16 returns the minimum number of bits required to represent x; the result is 0 for x == 0.

func Len32

func Len32(x uint32) (n int)

Len32 returns the minimum number of bits required to represent x; the result is 0 for x == 0.

func Len64

func Len64(x uint64) (n int)

Len64 returns the minimum number of bits required to represent x; the result is 0 for x == 0.

func Len8

func Len8(x uint8) int

Len8 returns the minimum number of bits required to represent x; the result is 0 for x == 0.

func OnesCount

func OnesCount(x uint) int

OnesCount returns the number of one bits ("population count") in x.

Example

1110
3

func OnesCount16

func OnesCount16(x uint16) int

OnesCount16 returns the number of one bits ("population count") in x.

Example

1110
3

func OnesCount32

func OnesCount32(x uint32) int

OnesCount32 returns the number of one bits ("population count") in x.

Example

1110
3

func OnesCount64

func OnesCount64(x uint64) int

OnesCount64 returns the number of one bits ("population count") in x.

Example

1110
3

func OnesCount8

func OnesCount8(x uint8) int

OnesCount8 returns the number of one bits ("population count") in x.

Example

1110
3

func Reverse

func Reverse(x uint) uint

Reverse returns the value of x with its bits in reversed order.

func Reverse16

func Reverse16(x uint16) uint16

Reverse16 returns the value of x with its bits in reversed order.

func Reverse32

func Reverse32(x uint32) uint32

Reverse32 returns the value of x with its bits in reversed order.

func Reverse64

func Reverse64(x uint64) uint64

Reverse64 returns the value of x with its bits in reversed order.

func Reverse8

func Reverse8(x uint8) uint8

Reverse8 returns the value of x with its bits in reversed order.

func ReverseBytes

func ReverseBytes(x uint) uint

ReverseBytes returns the value of x with its bytes in reversed order.

func ReverseBytes16

func ReverseBytes16(x uint16) uint16

ReverseBytes16 returns the value of x with its bytes in reversed order.

func ReverseBytes32

func ReverseBytes32(x uint32) uint32

ReverseBytes32 returns the value of x with its bytes in reversed order.

func ReverseBytes64

func ReverseBytes64(x uint64) uint64

ReverseBytes64 returns the value of x with its bytes in reversed order.

func RotateLeft

func RotateLeft(x uint, k int) uint

RotateLeft returns the value of x rotated left by (k mod UintSize) bits. To rotate x right by k bits, call RotateLeft(x, -k).

func RotateLeft16

func RotateLeft16(x uint16, k int) uint16

RotateLeft16 returns the value of x rotated left by (k mod 16) bits. To rotate x right by k bits, call RotateLeft16(x, -k).

func RotateLeft32

func RotateLeft32(x uint32, k int) uint32

RotateLeft32 returns the value of x rotated left by (k mod 32) bits. To rotate x right by k bits, call RotateLeft32(x, -k).

func RotateLeft64

func RotateLeft64(x uint64, k int) uint64

RotateLeft64 returns the value of x rotated left by (k mod 64) bits. To rotate x right by k bits, call RotateLeft64(x, -k).

func RotateLeft8

func RotateLeft8(x uint8, k int) uint8

RotateLeft8 returns the value of x rotated left by (k mod 8) bits. To rotate x right by k bits, call RotateLeft8(x, -k).

func TrailingZeros

func TrailingZeros(x uint) int

TrailingZeros returns the number of trailing zero bits in x; the result is UintSize for x == 0.

func TrailingZeros16

func TrailingZeros16(x uint16) (n int)

TrailingZeros16 returns the number of trailing zero bits in x; the result is 16 for x == 0.

func TrailingZeros32

func TrailingZeros32(x uint32) int

TrailingZeros32 returns the number of trailing zero bits in x; the result is 32 for x == 0.

func TrailingZeros64

func TrailingZeros64(x uint64) int

TrailingZeros64 returns the number of trailing zero bits in x; the result is 64 for x == 0.

func TrailingZeros8

func TrailingZeros8(x uint8) int

TrailingZeros8 returns the number of trailing zero bits in x; the result is 8 for x == 0.