Struct LoweringCapabilities 

pub struct LoweringCapabilities(/* private fields */);

Capabilities that change lowering, and therefore enter the plan identity.

Tags are namespaced (vendor.example/render) and the set is canonical: sorted, deduplicated, and validated, so two callers that declare the same capabilities in a different order form one identity. The set is deliberately conservative — a capability that turns out not to change lowering costs a duplicate entry, while omitting one that does would serve a wrong plan.

Implementations

impl LoweringCapabilities

pub fn none() -> LoweringCapabilities

No declaration: a plan whose lowering depends on nothing optional.

pub fn declare<I, S>(tags: I) -> Result<LoweringCapabilities, PlanInputError>

where I: IntoIterator<Item = S>, S: AsRef<str>,

Declare lowering-relevant capabilities. Order does not matter; tags are validated and canonicalized.

pub fn contains(&self, tag: &str) -> bool

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

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

pub fn missing_from<'a>( &'a self, other: &LoweringCapabilities, ) -> Option<&'a str>

The first capability this set requires that other does not declare.

Trait Implementations

impl Clone for LoweringCapabilities

fn clone(&self) -> LoweringCapabilities

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LoweringCapabilities

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

Formats the value using the given formatter.

impl Default for LoweringCapabilities

fn default() -> LoweringCapabilities

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for LoweringCapabilities

fn deserialize<__D>( __deserializer: __D, ) -> Result<LoweringCapabilities, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for LoweringCapabilities

impl Hash for LoweringCapabilities

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

where __H: Hasher,

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 LoweringCapabilities

fn cmp(&self, other: &LoweringCapabilities) -> 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.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for LoweringCapabilities

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for LoweringCapabilities

fn partial_cmp(&self, other: &LoweringCapabilities) -> 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 Serialize for LoweringCapabilities

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for LoweringCapabilities

impl TryFrom<Vec<String>> for LoweringCapabilities

type Error = PlanInputError

The type returned in the event of a conversion error.

fn try_from( values: Vec<String>, ) -> Result<LoweringCapabilities, <LoweringCapabilities as TryFrom<Vec<String>>>::Error>

Performs the conversion.