package decimal128

import "github.com/apache/arrow/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

Package Files ¶

decimal128.go

Variables ¶

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

type Num ¶ Uses

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 ¶ Uses

func FromI64(v int64) Num

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

func FromU64 ¶ Uses

func FromU64(v uint64) Num

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

func New ¶ Uses

func New(hi int64, lo uint64) Num

New returns a new signed 128-bit integer value.

func (Num) HighBits ¶ Uses

func (n Num) HighBits() int64

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

func (Num) LowBits ¶ Uses

func (n Num) LowBits() uint64

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

func (Num) Sign ¶ Uses

func (n Num) Sign() int

Sign returns:

-1 if x < 0

0 if x == 0

+1 if x > 0