Enum abi_stable::std_types::ROption

#[repr(C)]
pub enum ROption<T> {
    RSome(T),
    RNone,
}

Ffi-safe equivalent of the Option<_> type.

Option<_> is also ffi-safe for NonNull/NonZero types,and references.

Use ROption<_> when Option<_> would not be viable.

Variants

RSome(T)RNone

Methods

impl<T> ROption<T>

pub fn as_ref(&self) -> ROption<&T>

pub fn as_mut(&mut self) -> ROption<&mut T>

pub fn as_option(&self) -> Option<&T>

pub fn as_option_mut(&mut self) -> Option<&mut T>

pub fn into_option(self) -> Option<T>

pub fn expect(self, msg: &str) -> T

pub fn unwrap(self) -> T

pub fn unwrap_or(self, def: T) -> T

pub fn unwrap_or_else<F>(self, f: F) -> T where
    F: FnOnce() -> T, 

pub fn map<U, F>(self, f: F) -> ROption<U> where
    F: FnOnce(T) -> U, 

pub fn map_or<U, F>(self, default: U, f: F) -> U where
    F: FnOnce(T) -> U, 

pub fn map_or_else<U, D, F>(self, default: D, f: F) -> U where
    D: FnOnce() -> U,
    F: FnOnce(T) -> U, 

pub fn filter<P>(self, predicate: P) -> Self where
    P: FnOnce(&T) -> bool, 

pub fn or(self, optb: ROption<T>) -> ROption<T>

pub fn or_else<F>(self, f: F) -> ROption<T> where
    F: FnOnce() -> ROption<T>, 

pub fn xor(self, optb: ROption<T>) -> ROption<T>

pub fn get_or_insert(&mut self, v: T) -> &mut T

pub fn get_or_insert_with<F>(&mut self, f: F) -> &mut T where
    F: FnOnce() -> T, 

pub fn take(&mut self) -> ROption<T>

pub fn replace(&mut self, value: T) -> ROption<T>

Trait Implementations

impl<T> IntoReprRust for ROption<T>

type ReprRust = Option<T>

fn into_rust(self) -> Self::ReprRust

impl<T> SharedStableAbi for ROption<T> where
    T: __StableAbi, 

type IsNonZeroType = False

Whether this type has a single invalid bit-pattern.

type Kind = __ValueKind

The kind of abi stability of this type,there are 2:

type StaticEquivalent = ROption<__StaticEquivalent<T>>

A version of the type which does not borrow anything, used to create a UTypeId for doing layout checking.

const S_LAYOUT: &'static TypeLayout

The layout of the type provided by implementors.

const S_ABI_INFO: &'static AbiInfoWrapper

The layout of the type,derived from Self::LAYOUT and associated types.

impl<T> Into<Option<T>> for ROption<T>

fn into(self) -> Option<T>

Performs the conversion.

impl<T: Eq> Eq for ROption<T>

impl<T: Copy> Copy for ROption<T>

impl<T: PartialOrd> PartialOrd<ROption<T>> for ROption<T>

fn partial_cmp(&self, other: &ROption<T>) -> Option<Ordering>

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

fn lt(&self, other: &ROption<T>) -> bool

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

fn le(&self, other: &ROption<T>) -> bool

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

fn gt(&self, other: &ROption<T>) -> bool

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

fn ge(&self, other: &ROption<T>) -> bool

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

impl<T: PartialEq> PartialEq<ROption<T>> for ROption<T>

fn eq(&self, other: &ROption<T>) -> bool

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

fn ne(&self, other: &ROption<T>) -> bool

This method tests for !=.

impl<T> From<Option<T>> for ROption<T>

fn from(this: Option<T>) -> ROption<T>

Performs the conversion.

impl<T: Clone> Clone for ROption<T>

fn clone(&self) -> ROption<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Ord> Ord for ROption<T>

fn cmp(&self, other: &ROption<T>) -> 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

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

Restrict a value to a certain interval.

impl<T: Debug> Debug for ROption<T>

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

Formats the value using the given formatter.

impl<T: Hash> Hash for ROption<T>

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

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<'de, T> Deserialize<'de> for ROption<T> where
    T: Deserialize<'de>, 

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

Deserialize this value from the given Serde deserializer.

impl<T> Serialize for ROption<T> where
    T: Serialize, 

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

Serialize this value into the given Serde serializer.