bitslice

README

bitslice

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bitslice implements a simple slice-of-bits using a []byte slice for storage, used for efficient storage of boolean data, such as projection connectivity patterns.

Documentation

Overview

Package bitslice implements a simple slice-of-bits using a []byte slice for storage. used for efficient storage of boolean data, such as projection connectivity patterns.

Index

• func BitIndex(idx int) (byte int, bit uint32)
• type Slice
  • func Make(ln, cp int) Slice
  • func (bs *Slice) Append(val bool) Slice
  • func (bs *Slice) Cap() int
  • func (bs *Slice) Clone() Slice
  • func (bs *Slice) Delete(start, n int) Slice
  • func (bs *Slice) Index(idx int) bool
  • func (bs *Slice) Insert(start, n int) Slice
  • func (bs *Slice) Len() int
  • func (bs *Slice) Set(idx int, val bool)
  • func (bs *Slice) SetAll(val bool)
  • func (bs *Slice) SetLen(ln int)
  • func (bs *Slice) String() string
  • func (bs *Slice) SubSlice(start, end int) Slice
  • func (bs *Slice) ToBools() []bool

Functions

func BitIndex

func BitIndex(idx int) (byte int, bit uint32)

BitIndex returns the byte, bit index of given bit index

Types

type Slice

type Slice []byte

bitslice.Slice is the slice of []byte that holds the bits. first byte maintains the number of bits used in the last byte (0-7). when 0 then prior byte is all full and a new one must be added for append.

func Make

func Make(ln, cp int) Slice

Make makes a new bitslice of given length and capacity (optional, pass 0 for default) *bits* (rounds up 1 for both). also reserves first byte for extra bits value

func (*Slice) Append

func (bs *Slice) Append(val bool) Slice

Append adds a bit to the slice and returns possibly new slice, possibly old slice..

func (*Slice) Cap

func (bs *Slice) Cap() int

Cap returns the capacity of the slice in bits -- always modulo 8

func (*Slice) Clone

func (bs *Slice) Clone() Slice

Clone creates a new copy of this bitslice with separate memory

func (*Slice) Delete

func (bs *Slice) Delete(start, n int) Slice

Delete returns a new bit slice with N elements removed starting at given index. This must be a copy given the nature of the 8-bit aliasing.

func (*Slice) Index

func (bs *Slice) Index(idx int) bool

Index returns bit value at given bit index

func (*Slice) Insert

func (bs *Slice) Insert(start, n int) Slice

Insert returns a new bit slice with N false elements inserted starting at given index. This must be a copy given the nature of the 8-bit aliasing.

func (*Slice) Len

func (bs *Slice) Len() int

Len returns the length of the slice in bits

func (*Slice) Set

func (bs *Slice) Set(idx int, val bool)

Set sets value of given bit index -- no extra range checking is performed -- will panic if out of range

func (*Slice) SetAll

func (bs *Slice) SetAll(val bool)

SetAll sets all values to either on or off -- much faster than setting individual bits

func (*Slice) SetLen

func (bs *Slice) SetLen(ln int)

SetLen sets the length of the slice, copying values if a new allocation is required

func (*Slice) String

func (bs *Slice) String() string

String satisfies the fmt.Stringer interface

func (*Slice) SubSlice

func (bs *Slice) SubSlice(start, end int) Slice

SubSlice returns a new Slice from given start, end range indexes of this slice if end is <= 0 then the length of the source slice is used (equivalent to omitting the number after the : in a Go subslice expression)

func (*Slice) ToBools

func (bs *Slice) ToBools() []bool

ToBools converts to a []bool slice