crrand

package

v0.0.0-...-f2c3c5e Latest Latest Go to latest Published: Sep 11, 2025 License: Apache-2.0 Imports: 1 Imported by: 0

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Repository

github.com/cockroachdb/crlib

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Documentation ¶

Overview ¶

Package crrand implements functionality related to pseudorandom number generation.

Index ¶

type Perm64
- func MakePerm64(seed uint64) Perm64
- func (p Perm64) At(n uint64) uint64
- func (p Perm64) IndexOf(y uint64) uint64

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type Perm64 ¶

type Perm64 struct {
	// contains filtered or unexported fields
}

A Perm64 provides a deterministic, pseudorandom permutation of 64-bit values.

func MakePerm64 ¶

func MakePerm64(seed uint64) Perm64

MakePerm64 constructs a new Perm64 from a 64-bit seed, providing a deterministic, pseudorandom, bijective mapping of 64-bit values X to 64-bit values Y.

func (Perm64) At ¶

func (p Perm64) At(n uint64) uint64

At returns the nth value in the permutation of the 64-bit values. The return value may be passed to Index to recover n. The permutation is pseudorandom.

func (Perm64) IndexOf ¶

func (p Perm64) IndexOf(y uint64) uint64

IndexOf inverts the permutation, returning the index of the provided value in the permutation. If y was produced by At(x), then IndexOf(y) returns x.

Source Files ¶

View all Source files

perm.go

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