Enum OptLevel 

pub enum OptLevel {
    None,
    Basic,
    Balanced,
    Max,
    Size,
    SizeMin,
}

This enum describes the degree to which compiled programs will be optimized

Variants

None

No optimizations at all

Basic

Only basic optimizations are applied, e.g. constant propagation

Balanced

Most optimizations are applied, except when the cost is particularly high.

Max

All optimizations are applied, with all tradeoffs in favor of runtime performance

Size

Most optimizations are applied, but tuned to trade runtime performance for code size

SizeMin

Only optimizations which reduce code size are applied

Trait Implementations

impl Clone for OptLevel

fn clone(&self) -> OptLevel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OptLevel

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

Formats the value using the given formatter.

impl Default for OptLevel

fn default() -> OptLevel

Returns the “default value” for a type.

impl ValueEnum for OptLevel

fn value_variants<'a>() -> &'a [Self]

All possible argument values, in display order.

fn to_possible_value<'a>(&self) -> Option<PossibleValue>

The canonical argument value.

fn from_str(input: &str, ignore_case: bool) -> Result<Self, String>

Parse an argument into Self.

impl Copy for OptLevel