[][src]Enum rocket::Outcome

#[must_use]
pub enum Outcome<S, E, F> { Success(S), Failure(E), Forward(F), }

An enum representing success (Success), failure (Failure), or forwarding (Forward).

See the top level documentation for detailed information.

Variants

Contains the success value.

Contains the failure error value.

Contains the value to forward on.

Methods

impl<S, E, F> Outcome<S, E, F>
[src]

Unwraps the Outcome, yielding the contents of a Success.

Panics

Panics if the value is not Success.

Examples

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.unwrap(), 10);

Unwraps the Outcome, yielding the contents of a Success.

Panics

If the value is not Success, panics with the given message.

Examples

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.expect("success value"), 10);

Return true if this Outcome is a Success.

Examples

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.is_success(), true);

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.is_success(), false);

let x: Outcome<i32, &str, usize> = Forward(25);
assert_eq!(x.is_success(), false);

Return true if this Outcome is a Failure.

Examples

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.is_failure(), false);

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.is_failure(), true);

let x: Outcome<i32, &str, usize> = Forward(25);
assert_eq!(x.is_failure(), false);

Return true if this Outcome is a Forward.

Examples

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.is_forward(), false);

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.is_forward(), false);

let x: Outcome<i32, &str, usize> = Forward(25);
assert_eq!(x.is_forward(), true);

Converts from Outcome<S, E, F> to Option<S>.

Returns the Some of the Success if this is a Success, otherwise returns None. self is consumed, and all other values are discarded.

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.succeeded(), Some(10));

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.succeeded(), None);

let x: Outcome<i32, &str, usize> = Forward(25);
assert_eq!(x.succeeded(), None);

Converts from Outcome<S, E, F> to Option<E>.

Returns the Some of the Failure if this is a Failure, otherwise returns None. self is consumed, and all other values are discarded.

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.failed(), None);

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.failed(), Some("Hi! I'm an error."));

let x: Outcome<i32, &str, usize> = Forward(25);
assert_eq!(x.failed(), None);

Converts from Outcome<S, E, F> to Option<F>.

Returns the Some of the Forward if this is a Forward, otherwise returns None. self is consumed, and all other values are discarded.

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.forwarded(), None);

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.forwarded(), None);

let x: Outcome<i32, &str, usize> = Forward(25);
assert_eq!(x.forwarded(), Some(25));

Converts from Outcome<S, E, F> to Result<S, T> for a given T.

Returns Ok with the Success value if this is a Success, otherwise returns an Err with the provided value. self is consumed, and all other values are discarded.

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.success_or(false), Ok(10));

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.success_or(false), Err(false));

let x: Outcome<i32, &str, usize> = Forward(25);
assert_eq!(x.success_or("whoops"), Err("whoops"));

Converts from Outcome<S, E, F> to Result<S, T> for a given T produced from a supplied function or closure.

Returns Ok with the Success value if this is a Success, otherwise returns an Err with the result of calling f. self is consumed, and all other values are discarded.

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.success_or_else(|| false), Ok(10));

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.success_or_else(|| false), Err(false));

let x: Outcome<i32, &str, usize> = Forward(25);
assert_eq!(x.success_or_else(|| "whoops"), Err("whoops"));

Converts from Outcome<S, E, F> to Outcome<&S, &E, &F>.

let x: Outcome<i32, &str, usize> = Success(10);
assert_eq!(x.as_ref(), Success(&10));

let x: Outcome<i32, &str, usize> = Failure("Hi! I'm an error.");
assert_eq!(x.as_ref(), Failure(&"Hi! I'm an error."));

Maps an Outcome<S, E, F> to an Outcome<T, E, F> by applying the function f to the value of type S in self if self is an Outcome::Success.

let x: Outcome<i32, &str, usize> = Success(10);

let mapped = x.map(|v| if v == 10 { "10" } else { "not 10" });
assert_eq!(mapped, Success("10"));

Maps an Outcome<S, E, F> to an Outcome<S, T, F> by applying the function f to the value of type E in self if self is an Outcome::Failure.

let x: Outcome<i32, &str, usize> = Failure("hi");

let mapped = x.map_failure(|v| if v == "hi" { 10 } else { 0 });
assert_eq!(mapped, Failure(10));

Maps an Outcome<S, E, F> to an Outcome<S, E, T> by applying the function f to the value of type F in self if self is an Outcome::Forward.

let x: Outcome<i32, &str, usize> = Forward(5);

let mapped = x.map_forward(|v| if v == 5 { "a" } else { "b" });
assert_eq!(mapped, Forward("a"));

Maps an Outcome<S, E, F> to an Outcome<T, E, F> by applying the function f to the value of type S in self if self is an Outcome::Success.

Examples

let x: Outcome<i32, &str, bool> = Success(10);

let mapped = x.and_then(|v| match v {
   10 => Success("10"),
   1 => Forward(false),
   _ => Failure("30")
});

assert_eq!(mapped, Success("10"));

Maps an Outcome<S, E, F> to an Outcome<S, T, F> by applying the function f to the value of type E in self if self is an Outcome::Failure.

Examples

let x: Outcome<i32, &str, bool> = Failure("hi");

let mapped = x.failure_then(|v| match v {
   "hi" => Failure(10),
   "test" => Forward(false),
   _ => Success(10)
});

assert_eq!(mapped, Failure(10));

Maps an Outcome<S, E, F> to an Outcome<S, E, T> by applying the function f to the value of type F in self if self is an Outcome::Forward.

Examples

let x: Outcome<i32, &str, Option<bool>> = Forward(Some(false));

let mapped = x.forward_then(|v| match v {
   Some(true) => Success(10),
   Some(false) => Forward(20),
   None => Failure("10")
});

assert_eq!(mapped, Forward(20));

Converts from Outcome<S, E, F> to Outcome<&mut S, &mut E, &mut F>.

let mut x: Outcome<i32, &str, usize> = Success(10);
if let Success(val) = x.as_mut() {
    *val = 20;
}

assert_eq!(x.unwrap(), 20);

Trait Implementations

impl<S: Clone, E: Clone, F: Clone> Clone for Outcome<S, E, F>
[src]

Performs copy-assignment from source. Read more

impl<S: Copy, E: Copy, F: Copy> Copy for Outcome<S, E, F>
[src]

impl<S: Eq, E: Eq, F: Eq> Eq for Outcome<S, E, F>
[src]

impl<S: PartialOrd, E: PartialOrd, F: PartialOrd> PartialOrd<Outcome<S, E, F>> for Outcome<S, E, F>
[src]

impl<S: PartialEq, E: PartialEq, F: PartialEq> PartialEq<Outcome<S, E, F>> for Outcome<S, E, F>
[src]

impl<S: Ord, E: Ord, F: Ord> Ord for Outcome<S, E, F>
[src]

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

impl<S, E, F> Debug for Outcome<S, E, F>
[src]

impl<S, E, F> Display for Outcome<S, E, F>
[src]

impl<S: Hash, E: Hash, F: Hash> Hash for Outcome<S, E, F>
[src]

Feeds a slice of this type into the given [Hasher]. Read more

impl<S, E, F> Try for Outcome<S, E, F>
[src]

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

The type of this value when viewed as successful.

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

The type of this value when viewed as failed.

Auto Trait Implementations

impl<S, E, F> Send for Outcome<S, E, F> where
    E: Send,
    F: Send,
    S: Send

impl<S, E, F> Sync for Outcome<S, E, F> where
    E: Sync,
    F: Sync,
    S: Sync

Blanket Implementations

impl<T> From for T
[src]

impl<T, U> Into for T where
    U: From<T>, 
[src]

impl<T> ToString for T where
    T: Display + ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

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

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
[src]

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.

impl<T> BorrowMut for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Typeable for T where
    T: Any

Get the TypeId of this object.

impl<T> IntoCollection for T
[src]

impl<T, I> AsResult for T where
    I: Input
[src]

impl<Q, K> Equivalent for Q where
    K: Borrow<Q> + ?Sized,
    Q: Eq + ?Sized
[src]