Enum EnabledTernary 

pub enum EnabledTernary {
    Disabled,
    Unknown,
    Enabled,
}

Whether a dependency or feature is enabled on a specific platform.

This is a ternary or three-valued logic because the result may be unknown in some situations.

Returned by the methods on EnabledStatus, PlatformStatus, and PlatformEval.

Variants

Disabled

The dependency is disabled on this platform.

Unknown

The status of this dependency is unknown on this platform.

This may happen if evaluation involves unknown target features. Notably, this will not be returned when evaluating only against Platform::build_target(), since the target features for the build target platform are determined at compile time.

Enabled

The dependency is enabled on this platform.

Implementations

impl EnabledTernary

pub fn is_known(self) -> bool

Returns true if the status is known (either enabled or disabled).

Trait Implementations

impl BitAnd for EnabledTernary

AND operation in Kleene K3 logic.

type Output = EnabledTernary

The resulting type after applying the & operator.

fn bitand(self, rhs: Self) -> Self::Output

Performs the & operation.

impl BitOr for EnabledTernary

OR operation in Kleene K3 logic.

type Output = EnabledTernary

The resulting type after applying the | operator.

fn bitor(self, rhs: Self) -> Self

Performs the | operation.

impl Clone for EnabledTernary

fn clone(&self) -> EnabledTernary

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for EnabledTernary

impl Debug for EnabledTernary

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

Formats the value using the given formatter.

impl Eq for EnabledTernary

impl Hash for EnabledTernary

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 Ord for EnabledTernary

fn cmp(&self, other: &EnabledTernary) -> 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 EnabledTernary

fn eq(&self, other: &EnabledTernary) -> 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 EnabledTernary

fn partial_cmp(&self, other: &EnabledTernary) -> 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 EnabledTernary