Enum abi_stable::std_types::result::RResult

#[repr(u8)]
pub enum RResult<T, E> {
    ROk(T),
    RErr(E),
}

Ffi-safe equivalent of Result<T,E>.

Variants

ROk(T)RErr(E)

Methods

impl<T, E> RResult<T, E>

pub fn as_ref(&self) -> RResult<&T, &E>

Converts from RResult<T,E> to RResult<&T,&E>.

Example

assert_eq!(ROk::<u32,u32>(10).as_ref(),ROk(&10));
assert_eq!(RErr::<u32,u32>(5).as_ref(),RErr(&5));

pub fn as_mut(&mut self) -> RResult<&mut T, &mut E>

Converts from RResult<T,E> to RResult<&mut T,&mut E>.

Example

assert_eq!(ROk::<u32,u32>(10).as_mut(),ROk(&mut 10));
assert_eq!(RErr::<u32,u32>(5).as_mut(),RErr(&mut 5));

pub fn is_rok(&self) -> bool

Returns whether self is an ROk

Example

assert_eq!(ROk::<u32,u32>(10).is_rok(),true);
assert_eq!(RErr::<u32,u32>(5).is_rok(),false);

pub fn is_rerr(&self) -> bool

Returns whether self is an RErr

Example

assert_eq!(ROk::<u32,u32>(10).is_rerr(),false);
assert_eq!(RErr::<u32,u32>(5).is_rerr(),true);

pub fn into_result(self) -> Result<T, E>

Converts from RResult<T,E> to Result<T,E>.

Example

assert_eq!(ROk::<u32,u32>(10).into_result(),Ok (10));
assert_eq!(RErr::<u32,u32>(5).into_result(),Err(5));

pub fn map<U, F>(self, op: F) -> RResult<U, E> where
    F: FnOnce(T) -> U, 

Converts the RResult<T,E> to a RResult<U,E> by transforming the value in ROk using the op closure.

Example

assert_eq!(ROk::<u32,u32>(10).map(|x| x*3 ),ROk(30));
assert_eq!(RErr::<u32,u32>(5).map(|x| x/2 ),RErr(5));

pub fn map_err<F, O>(self, op: O) -> RResult<T, F> where
    O: FnOnce(E) -> F, 

Converts the RResult<T,E> to a RResult<U,F> by transforming the value in RErr using the op closure.

Example

assert_eq!(ROk::<u32,u32>(10).map_err(|x| x*3 ),ROk(10));
assert_eq!(RErr::<u32,u32>(5).map_err(|x| x/2 ),RErr(2));

pub fn map_or_else<U, M, F>(self, with_err: F, with_ok: M) -> U where
    M: FnOnce(T) -> U,
    F: FnOnce(E) -> U, 

Converts the RResult<T,E> to a U by transforming the value in ROk using the with_ok closure, otherwise transforming the value in RErr using the with_err closure,

Example

assert_eq!(ROk::<u32,u32>(10).map_or_else(|_|77 ,|x| x*3 ),30);
assert_eq!(RErr::<u32,u32>(5).map_or_else(|e|e*4,|x| x/2 ),20);

pub fn and_then<U, F>(self, op: F) -> RResult<U, E> where
    F: FnOnce(T) -> RResult<U, E>, 

Calls the op closure with the value of ROk, otherwise returning the RErr unmodified.

Example

assert_eq!(
    ROk::<u32,u32>(10).and_then(|x| ROk ::<u32,u32>(x*3) ),
    ROk (30),
);
assert_eq!(
    ROk::<u32,u32>(10).and_then(|x| RErr::<u32,u32>(x*3)),
    RErr(30),
);
assert_eq!(
    RErr::<u32,u32>(5).and_then(|x| ROk ::<u32,u32>(x/2) ),
    RErr(5),
);
assert_eq!(
    RErr::<u32,u32>(5).and_then(|x| RErr::<u32,u32>(x/2) ),
    RErr(5),
);

pub fn or_else<F, O>(self, op: O) -> RResult<T, F> where
    O: FnOnce(E) -> RResult<T, F>, 

Calls the op closure with the value of RErr, otherwise returning the ROk unmodified.

Example

assert_eq!(ROk::<u32,u32>(10).or_else(|e| ROk ::<u32,u32>(e*3) ) ,ROk(10));
assert_eq!(ROk::<u32,u32>(10).or_else(|e| RErr::<u32,u32>(e*3)) ,ROk(10));
assert_eq!(RErr::<u32,u32>(5).or_else(|e| ROk ::<u32,u32>(e/2) ),ROk (2));
assert_eq!(RErr::<u32,u32>(5).or_else(|e| RErr::<u32,u32>(e/2) ),RErr(2));

pub fn unwrap(self) -> T where
    E: Debug, 

Unwraps self, returning the value in Ok.

Panic

Panics if self is an Err(_) with an error message using Es Debug implementation.

pub fn expect(self, message: &str) -> T where
    E: Debug, 

Unwraps self, returning the value in Ok.

Panic

Panics if self is an Err(_) with an error message using Es Debug implementation, as well as message.

pub fn unwrap_err(self) -> E where
    T: Debug, 

Unwraps self, returning the value in Err.

Panic

Panics if self is an Ok(_) with an error message using Ts Debug implementation.

pub fn expect_err(self, message: &str) -> E where
    T: Debug, 

Unwraps self, returning the value in Err.

Panic

Panics if self is an Ok(_) with an error message using Ts Debug implementation, as well as message.

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

Returns the value in the RResult<T,E>,or def if self is RErr.

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

Returns the value in the RResult<T,E>, or calls def with the error in RErr.

Example

assert_eq!(ROk::<u32,u32>(10).unwrap_or_else(|e| e*3 ),10);
assert_eq!(RErr::<u32,u32>(5).unwrap_or_else(|e| e/2 ),2);

pub fn unwrap_or_default(self) -> T where
    T: Default, 

Returns the value in the RResult<T,E>, or returns T::default() it self is an RErr.

Example

assert_eq!(ROk::<u32,u32>(10).unwrap_or_default(),10);
assert_eq!(RErr::<u32,u32>(5).unwrap_or_default(),0);

pub fn ok(self) -> ROption<T>

Converts from RResult<T, E> to ROption,ROk maps to RSome,RErr maps to RNone.

Example

assert_eq!(ROk::<u32,u32>(10).ok(),RSome(10));
assert_eq!(RErr::<u32,u32>(5).ok(),RNone);

pub fn err(self) -> ROption<E>

Converts from RResult<T, E> to ROption,ROk maps to RNone,RErr maps to RSome.

Example

assert_eq!(ROk::<u32,u32>(10).err(),RNone);
assert_eq!(RErr::<u32,u32>(5).err(),RSome(5));

Trait Implementations

impl<T, E> IntoReprRust for RResult<T, E>

type ReprRust = Result<T, E>

fn into_rust(self) -> Self::ReprRust

impl<T, E> SharedStableAbi for RResult<T, E> where
    E: __StableAbi,
    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 = RResult<__StaticEquivalent<T>, __StaticEquivalent<E>>

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: PartialEq, E: PartialEq> PartialEq<RResult<T, E>> for RResult<T, E>

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

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

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

This method tests for !=.

impl<T, E> From<Result<T, E>> for RResult<T, E>

fn from(this: Result<T, E>) -> RResult<T, E>

Performs the conversion.

impl<T: Clone, E: Clone> Clone for RResult<T, E>

fn clone(&self) -> RResult<T, E>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Ord, E: Ord> Ord for RResult<T, E>

fn cmp(&self, other: &RResult<T, E>) -> 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: Eq, E: Eq> Eq for RResult<T, E>

impl<T, E> Into<Result<T, E>> for RResult<T, E>

fn into(self) -> Result<T, E>

Performs the conversion.

impl<T: Copy, E: Copy> Copy for RResult<T, E>

impl<T: PartialOrd, E: PartialOrd> PartialOrd<RResult<T, E>> for RResult<T, E>

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

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

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

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

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

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

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

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

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

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

impl<T: Debug, E: Debug> Debug for RResult<T, E>

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

Formats the value using the given formatter.

impl<T: Hash, E: Hash> Hash for RResult<T, E>

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

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, E> Deserialize<'de> for RResult<T, E> where
    T: Deserialize<'de>,
    E: 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, E> Serialize for RResult<T, E> where
    T: Serialize,
    E: Serialize, 

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

Serialize this value into the given Serde serializer.