Enum Strategy 

pub enum Strategy {
    Fast,
    Dfast,
    Greedy,
    Lazy,
    Lazy2,
    Btlazy2,
    Btopt,
    Btultra,
    Btultra2,
}

Match-finder strategy — the drop-in equivalent of C zstd’s ZSTD_strategy enum (ZSTD_fast … ZSTD_btultra2). The numeric ordinals match upstream (fast = 1 … btultra2 = 9), so Strategy::ordinal / Strategy::from_ordinal round-trip with the C ZSTD_c_strategy parameter value.

Variants

Fast

ZSTD_fast (1) — single-table fast finder.

Dfast

ZSTD_dfast (2) — two parallel hash tables.

Greedy

ZSTD_greedy (3) — commit the first acceptable match, no lookahead.

Lazy

ZSTD_lazy (4) — one-position lazy lookahead.

Lazy2

ZSTD_lazy2 (5) — two-position lazy lookahead.

Btlazy2

ZSTD_btlazy2 (6) — binary-tree-assisted lazy2.

Btopt

ZSTD_btopt (7) — optimal parser, no ultra refinements.

Btultra

ZSTD_btultra (8) — optimal parser with refined price tables.

Btultra2

ZSTD_btultra2 (9) — optimal parser with two-pass dynamic stats.

Implementations

impl Strategy

pub const fn ordinal(self) -> u32

Upstream ZSTD_strategy ordinal (fast = 1 … btultra2 = 9).

pub const fn from_ordinal(ordinal: u32) -> Option<Self>

Construct from an upstream ZSTD_strategy ordinal. Returns None outside 1..=9.

Trait Implementations

impl Clone for Strategy

fn clone(&self) -> Strategy

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Strategy

impl Debug for Strategy

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Strategy

impl Ord for Strategy

fn cmp(&self, other: &Strategy) -> Ordering

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Strategy

fn eq(&self, other: &Strategy) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Strategy

fn partial_cmp(&self, other: &Strategy) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Strategy