Enum FeatureLabel

pub enum FeatureLabel<'g> {
    Base,
    Named(&'g str),
    OptionalDependency(&'g str),
}

A unique identifier for a feature within a specific package. Forms part of a FeatureId.

Variants

Base

The “base” feature. Every package has one such feature.

Named(&'g str)

This is a named feature in the [features] section, or an implicit feature that corresponds to an optional dependency.

For versions of Cargo prior to 1.60, optional dependencies always create implicit features by the same name. For versions 1.60 and greater, optional dependencies may create implicit features if the dependency doesn’t exist with the name “dep” in it.

OptionalDependency(&'g str)

This is an optional dependency.

Implementations

impl<'g> FeatureLabel<'g>

pub fn kind(self) -> FeatureKind

Returns the kind of feature this is.

The kind of a feature is simply the enum variant without any associated data.

Trait Implementations

impl<'g> Clone for FeatureLabel<'g>

fn clone(&self) -> FeatureLabel<'g>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'g> Debug for FeatureLabel<'g>

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

Formats the value using the given formatter.

impl<'g> Display for FeatureLabel<'g>

The Display impl for FeatureLabel prints out:

• [base] for base labels.
• feature-name for optional dependencies.
• dep:dep-name for named features.

Examples

use guppy::graph::feature::FeatureLabel;

assert_eq!(format!("{}", FeatureLabel::Base), "[base]");
assert_eq!(format!("{}", FeatureLabel::Named("foo")), "foo");
assert_eq!(format!("{}", FeatureLabel::OptionalDependency("bar")), "dep:bar");

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

Formats the value using the given formatter.

impl<'g> Hash for FeatureLabel<'g>

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<'g> Ord for FeatureLabel<'g>

fn cmp(&self, other: &FeatureLabel<'g>) -> 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<'g> PartialEq for FeatureLabel<'g>

fn eq(&self, other: &FeatureLabel<'g>) -> 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<'g> PartialOrd for FeatureLabel<'g>

fn partial_cmp(&self, other: &FeatureLabel<'g>) -> 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<'g> Copy for FeatureLabel<'g>

impl<'g> Eq for FeatureLabel<'g>

impl<'g> StructuralPartialEq for FeatureLabel<'g>