Enum OptionValue 

pub enum OptionValue {
    On,
    Off,
    Unknown,
}

Tri-state value for a parser-visible zsh option.

Unknown is used when the parser cannot prove a single value, for example after merging control-flow paths that set an option differently. Consumers should only branch on OptionValue::On or OptionValue::Off when the corresponding is_definitely_* helper returns true.

Variants

On

The option is enabled.

Off

The option is disabled.

Unknown

The option value is unknown or differs across merged states.

Implementations

impl OptionValue

pub const fn is_definitely_on(self) -> bool

Returns true when the option is known to be enabled.

pub const fn is_definitely_off(self) -> bool

Returns true when the option is known to be disabled.

pub const fn merge(self, other: Self) -> Self

Merge two option values, preserving certainty only when they agree.

This is intended for conservative flow joins: On + On remains On, Off + Off remains Off, and every mixed or unknown combination becomes OptionValue::Unknown.

Trait Implementations

impl Clone for OptionValue

fn clone(&self) -> OptionValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OptionValue

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

Formats the value using the given formatter.

impl Default for OptionValue

fn default() -> OptionValue

Returns the “default value” for a type.

impl Hash for OptionValue

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for OptionValue

fn eq(&self, other: &OptionValue) -> 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 Copy for OptionValue

impl Eq for OptionValue

impl StructuralPartialEq for OptionValue