Struct FeatureSet 

pub struct FeatureSet { /* private fields */ }

A set of features.

Implementations

impl FeatureSet

pub const fn empty() -> Self

No features. A value that needs nothing is one every revision can express.

pub fn with(self, feature: Feature) -> Self

Adds a feature.

pub fn insert(&mut self, feature: Feature)

Adds a feature in place.

pub fn contains(self, feature: Feature) -> bool

Whether the feature is in the set.

pub const fn is_empty(self) -> bool

Whether the set needs nothing.

pub const fn len(self) -> u32

How many features the set holds.

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

The union of two sets.

This is the workhorse: a result with five content blocks needs the union of what each block needs, and a result with a content array plus structuredContent needs the union of both.

pub fn union_of(features: impl IntoIterator<Item = Feature>) -> Self

The union of everything in features.

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

The features in self that are not in other.

pub const fn from_bits(bits: u128) -> Self

A set from the raw bit encoding.

The encoding is shared with FeatureProfile, which is what lets required.is_subset_of(&profile.as_set()) be one mask test. This constructor is the only way to build a set from those bits, and it exists so that sharing has exactly one door: a caller that wanted a set from somewhere else would have to hand-assemble the same u128, and the type would no longer be trustworthy as a mirror of a profile.

pub const fn bits(self) -> u128

The raw bit encoding, shared with FeatureProfile.

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

Whether every feature in self is also in other.

This is the lowering gate: “can the session express this value”.

pub fn iter(self) -> impl Iterator<Item = Feature>

The features in the set, in declaration order.

Trait Implementations

impl Clone for FeatureSet

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FeatureSet

impl Debug for FeatureSet

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

Formats the value using the given formatter.

impl Default for FeatureSet

fn default() -> Self

Returns the “default value” for a type.

impl Eq for FeatureSet

impl Hash for FeatureSet

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 FeatureSet

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FeatureSet