Struct cargo_feature_matrix::features::Feature

pub struct Feature<'f>(_);

Methods from Deref<Target = Cow<'f, str>>

pub fn is_borrowed(&self) -> bool

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

Returns true if the data is borrowed, i.e. if to_mut would require additional work.

Examples

#![feature(cow_is_borrowed)]
use std::borrow::Cow;

let cow = Cow::Borrowed("moo");
assert!(cow.is_borrowed());

let bull: Cow<'_, str> = Cow::Owned("...moo?".to_string());
assert!(!bull.is_borrowed());

pub fn is_owned(&self) -> bool

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

Returns true if the data is owned, i.e. if to_mut would be a no-op.

Examples

#![feature(cow_is_borrowed)]
use std::borrow::Cow;

let cow: Cow<'_, str> = Cow::Owned("moo".to_string());
assert!(cow.is_owned());

let bull = Cow::Borrowed("...moo?");
assert!(!bull.is_owned());

pub fn to_mut(&mut self) -> &mut <B as ToOwned>::Owned

Acquires a mutable reference to the owned form of the data.

Clones the data if it is not already owned.

Examples

use std::borrow::Cow;

let mut cow = Cow::Borrowed("foo");
cow.to_mut().make_ascii_uppercase();

assert_eq!(
  cow,
  Cow::Owned(String::from("FOO")) as Cow<str>
);

Trait Implementations

impl<'f, __AsMutT: ?Sized> AsMut<__AsMutT> for Feature<'f> where
    Cow<'f, str>: AsMut<__AsMutT>, 

fn as_mut(&mut self) -> &mut __AsMutT

Performs the conversion.

impl<'f, __AsRefT: ?Sized> AsRef<__AsRefT> for Feature<'f> where
    Cow<'f, str>: AsRef<__AsRefT>, 

fn as_ref(&self) -> &__AsRefT

Performs the conversion.

impl<'f> Clone for Feature<'f>

fn clone(&self) -> Feature<'f>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'f> Debug for Feature<'f>

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

Formats the value using the given formatter.

impl<'f> Deref for Feature<'f>

type Target = Cow<'f, str>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'f> DerefMut for Feature<'f>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<'de, 'f> Deserialize<'de> for Feature<'f>

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

Deserialize this value from the given Serde deserializer.

impl Display for Feature<'_>

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

Formats the value using the given formatter.

impl From<String> for Feature<'static>

fn from(s: String) -> Self

Performs the conversion.

impl<'f> FromIterator<Feature<'f>> for FeatureSet<'f>

fn from_iter<T: IntoIterator<Item = Feature<'f>>>(iter: T) -> Self

Creates a value from an iterator.

impl<'f> Hash for Feature<'f>

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, 

Feeds a slice of this type into the given Hasher.

impl<'f> Ord for Feature<'f>

fn cmp(&self, other: &Feature<'f>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl<'f> PartialEq<Feature<'f>> for Feature<'f>

fn eq(&self, other: &Feature<'f>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Feature<'f>) -> bool

This method tests for !=.

impl<'f> PartialOrd<Feature<'f>> for Feature<'f>

fn partial_cmp(&self, other: &Feature<'f>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'f> Serialize for Feature<'f>

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

Serialize this value into the given Serde serializer.

impl<'f> Eq for Feature<'f>

impl<'f> StructuralEq for Feature<'f>

impl<'f> StructuralPartialEq for Feature<'f>