Trait q_compress::data_types::SignedLike

pub trait SignedLike: NumberLike<Signed = Self> {
    const ZERO: Self;

    // Required methods
    fn wrapping_add(self, other: Self) -> Self;
    fn wrapping_sub(self, other: Self) -> Self;
}

Trait for data types that behave like signed integers.

This is used for delta encoding/decoding; i.e. the difference between consecutive numbers must be a SignedLike. For example,

• The deltas between consecutive u64s are i64.
• The deltas between consecutive i64s are i64.
• The deltas between consecutive timestamps are i128.
• The deltas between consecutive bools are bools (basically 1 bit signed integers under XOR).

This is important because deltas like +1 and -1 are numerically close to each other and easily compressible, which would not be the case with unsigned integers. Note: API stability of SignedLike is not guaranteed.

Required Associated Constants

const ZERO: Self

Required Methods

fn wrapping_add(self, other: Self) -> Self

fn wrapping_sub(self, other: Self) -> Self

Implementations on Foreign Types

impl SignedLike for bool

const ZERO: Self = false

fn wrapping_add(self, other: Self) -> Self

fn wrapping_sub(self, other: Self) -> Self

impl SignedLike for i64

const ZERO: Self = 0i64

fn wrapping_add(self, other: Self) -> Self

fn wrapping_sub(self, other: Self) -> Self

impl SignedLike for i16

const ZERO: Self = 0i16

fn wrapping_add(self, other: Self) -> Self

fn wrapping_sub(self, other: Self) -> Self

impl SignedLike for i32

const ZERO: Self = 0i32

fn wrapping_add(self, other: Self) -> Self

fn wrapping_sub(self, other: Self) -> Self

Implementors