package decimal128

import "git.sr.ht/~sbinet/go-arrow/decimal128"

Index ¶

• Variables
• type Num
• func FromI64(v int64) Num
• func FromU64(v uint64) Num
• func New(hi int64, lo uint64) Num
• func (n Num) HighBits() int64
• func (n Num) LowBits() uint64
• func (n Num) Sign() int

Variables ¶

var (
	MaxDecimal128 = New(542101086242752217, 687399551400673280-1)
)

Types ¶

type Num ¶

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

Num represents a signed 128-bit integer in two's complement. Calculations wrap around and overflow is ignored.

For a discussion of the algorithms, look at Knuth's volume 2, Semi-numerical Algorithms section 4.3.1.

Adapted from the Apache ORC C++ implementation

func FromI64 ¶

func FromI64(v int64) Num

FromI64 returns a new signed 128-bit integer value from the provided int64 one.

func FromU64 ¶

func FromU64(v uint64) Num

FromU64 returns a new signed 128-bit integer value from the provided uint64 one.

func New ¶

func New(hi int64, lo uint64) Num

New returns a new signed 128-bit integer value.

func (Num) HighBits ¶

func (n Num) HighBits() int64

HighBits returns the high bits of the two's complement representation of the number.

func (Num) LowBits ¶

func (n Num) LowBits() uint64

LowBits returns the low bits of the two's complement representation of the number.

func (Num) Sign ¶

func (n Num) Sign() int

Sign returns:

-1 if x < 0

0 if x == 0

+1 if x > 0

Source Files ¶

decimal128.go