# 1.0.0[−][src]Enum core::result::Result

    #[must_use = "this `Result` may be an `Err` variant, which should be handled"]
    pub enum Result<T, E> {
        Ok(T),
        Err(E),
    }

`Result` is a type that represents either success (`Ok`) or failure (`Err`).

See the `std::result` module documentation for details.

## Variants

`Ok(T)`

Contains the success value

`Err(E)`

Contains the error value

## Methods

###

`impl<T, E> Result<T, E>`

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####

`pub fn is_ok(&self) -> bool`

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Returns `true` if the result is `Ok`.

# Examples

Basic usage:

    let x: Result<i32, &str> = Ok(-3);
    assert_eq!(x.is_ok(), true);

    let x: Result<i32, &str> = Err("Some error message");
    assert_eq!(x.is_ok(), false);Run

####

`pub fn is_err(&self) -> bool`

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Returns `true` if the result is `Err`.

# Examples

Basic usage:

    let x: Result<i32, &str> = Ok(-3);
    assert_eq!(x.is_err(), false);

    let x: Result<i32, &str> = Err("Some error message");
    assert_eq!(x.is_err(), true);Run

####

`pub fn ok(self) -> Option<T>`

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Converts from `Result<T, E>` to `Option<T>`.

Converts `self` into an `Option<T>`, consuming `self`, and discarding the error, if any.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(2);
    assert_eq!(x.ok(), Some(2));

    let x: Result<u32, &str> = Err("Nothing here");
    assert_eq!(x.ok(), None);Run

####

`pub fn err(self) -> Option<E>`

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Converts from `Result<T, E>` to `Option<E>`.

Converts `self` into an `Option<E>`, consuming `self`, and discarding the success value, if any.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(2);
    assert_eq!(x.err(), None);

    let x: Result<u32, &str> = Err("Nothing here");
    assert_eq!(x.err(), Some("Nothing here"));Run

####

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

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Converts from `Result<T, E>` to `Result<&T, &E>`.

Produces a new `Result`, containing a reference into the original, leaving the original in place.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(2);
    assert_eq!(x.as_ref(), Ok(&2));

    let x: Result<u32, &str> = Err("Error");
    assert_eq!(x.as_ref(), Err(&"Error"));Run

####

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

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Converts from `Result<T, E>` to `Result<&mut T, &mut E>`.

# Examples

Basic usage:

    fn mutate(r: &mut Result<i32, i32>) {
        match r.as_mut() {
            Ok(v) => *v = 42,
            Err(e) => *e = 0,
        }
    }

    let mut x: Result<i32, i32> = Ok(2);
    mutate(&mut x);
    assert_eq!(x.unwrap(), 42);

    let mut x: Result<i32, i32> = Err(13);
    mutate(&mut x);
    assert_eq!(x.unwrap_err(), 0);Run

####

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

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Maps a `Result<T, E>` to `Result<U, E>` by applying a function to a contained `Ok` value, leaving an `Err` value untouched.

This function can be used to compose the results of two functions.

# Examples

Print the numbers on each line of a string multiplied by two.

    let line = "1\n2\n3\n4\n";

    for num in line.lines() {
        match num.parse::<i32>().map(|i| i * 2) {
            Ok(n) => println!("{}", n),
            Err(..) => {}
        }
    }Run

####

`pub fn map_or_else<U, M: FnOnce(T) -> U, F: FnOnce(E) -> U>( self, fallback: F, map: M ) -> U`

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🔬 This is a nightly-only experimental API. (`result_map_or_else` #53268)

Maps a `Result<T, E>` to `U` by applying a function to a contained `Ok` value, or a fallback function to a contained `Err` value.

This function can be used to unpack a successful result while handling an error.

# Examples

Basic usage:

    #![feature(result_map_or_else)]
    let k = 21;

    let x : Result<_, &str> = Ok("foo");
    assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 3);

    let x : Result<&str, _> = Err("bar");
    assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 42);Run

####

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

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Maps a `Result<T, E>` to `Result<T, F>` by applying a function to a contained `Err` value, leaving an `Ok` value untouched.

This function can be used to pass through a successful result while handling an error.

# Examples

Basic usage:

    fn stringify(x: u32) -> String { format!("error code: {}", x) }

    let x: Result<u32, u32> = Ok(2);
    assert_eq!(x.map_err(stringify), Ok(2));

    let x: Result<u32, u32> = Err(13);
    assert_eq!(x.map_err(stringify), Err("error code: 13".to_string()));Run

####
ⓘImportant traits for Iter<'a, T>

### Important traits for Iter<'a, T>

`impl<'a, T> Iterator for Iter<'a, T> type Item = &'a T;`

`pub fn iter(&self) -> Iter<T>`

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Returns an iterator over the possibly contained value.

The iterator yields one value if the result is `Result::Ok`, otherwise none.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(7);
    assert_eq!(x.iter().next(), Some(&7));

    let x: Result<u32, &str> = Err("nothing!");
    assert_eq!(x.iter().next(), None);Run

####
ⓘImportant traits for IterMut<'a, T>

### Important traits for IterMut<'a, T>

`impl<'a, T> Iterator for IterMut<'a, T> type Item = &'a mut T;`

`pub fn iter_mut(&mut self) -> IterMut<T>`

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Returns a mutable iterator over the possibly contained value.

The iterator yields one value if the result is `Result::Ok`, otherwise none.

# Examples

Basic usage:

    let mut x: Result<u32, &str> = Ok(7);
    match x.iter_mut().next() {
        Some(v) => *v = 40,
        None => {},
    }
    assert_eq!(x, Ok(40));

    let mut x: Result<u32, &str> = Err("nothing!");
    assert_eq!(x.iter_mut().next(), None);Run

####

`pub fn and<U>(self, res: Result<U, E>) -> Result<U, E>`

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Returns `res` if the result is `Ok`, otherwise returns the `Err` value of `self`.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(2);
    let y: Result<&str, &str> = Err("late error");
    assert_eq!(x.and(y), Err("late error"));

    let x: Result<u32, &str> = Err("early error");
    let y: Result<&str, &str> = Ok("foo");
    assert_eq!(x.and(y), Err("early error"));

    let x: Result<u32, &str> = Err("not a 2");
    let y: Result<&str, &str> = Err("late error");
    assert_eq!(x.and(y), Err("not a 2"));

    let x: Result<u32, &str> = Ok(2);
    let y: Result<&str, &str> = Ok("different result type");
    assert_eq!(x.and(y), Ok("different result type"));Run

####

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

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Calls `op` if the result is `Ok`, otherwise returns the `Err` value of `self`.

This function can be used for control flow based on `Result` values.

# Examples

Basic usage:

    fn sq(x: u32) -> Result<u32, u32> { Ok(x * x) }
    fn err(x: u32) -> Result<u32, u32> { Err(x) }

    assert_eq!(Ok(2).and_then(sq).and_then(sq), Ok(16));
    assert_eq!(Ok(2).and_then(sq).and_then(err), Err(4));
    assert_eq!(Ok(2).and_then(err).and_then(sq), Err(2));
    assert_eq!(Err(3).and_then(sq).and_then(sq), Err(3));Run

####

`pub fn or<F>(self, res: Result<T, F>) -> Result<T, F>`

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Returns `res` if the result is `Err`, otherwise returns the `Ok` value of `self`.

Arguments passed to `or` are eagerly evaluated; if you are passing the result of a function call, it is recommended to use `or_else`, which is lazily evaluated.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(2);
    let y: Result<u32, &str> = Err("late error");
    assert_eq!(x.or(y), Ok(2));

    let x: Result<u32, &str> = Err("early error");
    let y: Result<u32, &str> = Ok(2);
    assert_eq!(x.or(y), Ok(2));

    let x: Result<u32, &str> = Err("not a 2");
    let y: Result<u32, &str> = Err("late error");
    assert_eq!(x.or(y), Err("late error"));

    let x: Result<u32, &str> = Ok(2);
    let y: Result<u32, &str> = Ok(100);
    assert_eq!(x.or(y), Ok(2));Run

####

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

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Calls `op` if the result is `Err`, otherwise returns the `Ok` value of `self`.

This function can be used for control flow based on result values.

# Examples

Basic usage:

    fn sq(x: u32) -> Result<u32, u32> { Ok(x * x) }
    fn err(x: u32) -> Result<u32, u32> { Err(x) }

    assert_eq!(Ok(2).or_else(sq).or_else(sq), Ok(2));
    assert_eq!(Ok(2).or_else(err).or_else(sq), Ok(2));
    assert_eq!(Err(3).or_else(sq).or_else(err), Ok(9));
    assert_eq!(Err(3).or_else(err).or_else(err), Err(3));Run

####

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

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Unwraps a result, yielding the content of an `Ok`. Else, it returns `optb`.

Arguments passed to `unwrap_or` are eagerly evaluated; if you are passing the result of a function call, it is recommended to use `unwrap_or_else`, which is lazily evaluated.

# Examples

Basic usage:

    let optb = 2;
    let x: Result<u32, &str> = Ok(9);
    assert_eq!(x.unwrap_or(optb), 9);

    let x: Result<u32, &str> = Err("error");
    assert_eq!(x.unwrap_or(optb), optb);Run

####

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

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Unwraps a result, yielding the content of an `Ok`. If the value is an `Err` then it calls `op` with its value.

# Examples

Basic usage:

    fn count(x: &str) -> usize { x.len() }

    assert_eq!(Ok(2).unwrap_or_else(count), 2);
    assert_eq!(Err("foo").unwrap_or_else(count), 3);Run

###

`impl<T, E: Debug> Result<T, E>`

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####

`pub fn unwrap(self) -> T`

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Unwraps a result, yielding the content of an `Ok`.

# Panics

Panics if the value is an `Err`, with a panic message provided by the `Err`'s value.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(2);
    assert_eq!(x.unwrap(), 2);Run

    let x: Result<u32, &str> = Err("emergency failure");
    x.unwrap(); // panics with `emergency failure`Run

####

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

1.4.0
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Unwraps a result, yielding the content of an `Ok`.

# Panics

Panics if the value is an `Err`, with a panic message including the passed message, and the content of the `Err`.

# Examples

Basic usage:

    let x: Result<u32, &str> = Err("emergency failure");
    x.expect("Testing expect"); // panics with `Testing expect: emergency failure`Run

###

`impl<T: Debug, E> Result<T, E>`

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####

`pub fn unwrap_err(self) -> E`

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Unwraps a result, yielding the content of an `Err`.

# Panics

Panics if the value is an `Ok`, with a custom panic message provided by the `Ok`'s value.

# Examples

    let x: Result<u32, &str> = Ok(2);
    x.unwrap_err(); // panics with `2`Run

    let x: Result<u32, &str> = Err("emergency failure");
    assert_eq!(x.unwrap_err(), "emergency failure");Run

####

`pub fn expect_err(self, msg: &str) -> E`

1.17.0
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Unwraps a result, yielding the content of an `Err`.

# Panics

Panics if the value is an `Ok`, with a panic message including the passed message, and the content of the `Ok`.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(10);
    x.expect_err("Testing expect_err"); // panics with `Testing expect_err: 10`Run

###

`impl<T: Default, E> Result<T, E>`

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####

`pub fn unwrap_or_default(self) -> T`

1.16.0
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Returns the contained value or a default

Consumes the `self` argument then, if `Ok`, returns the contained value, otherwise if `Err`, returns the default value for that type.

# Examples

Convert a string to an integer, turning poorly-formed strings into 0 (the default value for integers). `parse` converts a string to any other type that implements `FromStr`, returning an `Err` on error.

    let good_year_from_input = "1909";
    let bad_year_from_input = "190blarg";
    let good_year = good_year_from_input.parse().unwrap_or_default();
    let bad_year = bad_year_from_input.parse().unwrap_or_default();

    assert_eq!(1909, good_year);
    assert_eq!(0, bad_year);Run

###

`impl<T: Deref, E> Result<T, E>`

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####

`pub fn deref_ok(&self) -> Result<&T::Target, &E>`

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🔬 This is a nightly-only experimental API. (`inner_deref` #50264)

newly added

Converts from `&Result<T, E>` to `Result<&T::Target, &E>`.

Leaves the original Result in-place, creating a new one with a reference to the original one, additionally coercing the `Ok` arm of the Result via `Deref`.

###

`impl<T, E: Deref> Result<T, E>`

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####

`pub fn deref_err(&self) -> Result<&T, &E::Target>`

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🔬 This is a nightly-only experimental API. (`inner_deref` #50264)

newly added

Converts from `&Result<T, E>` to `Result<&T, &E::Target>`.

Leaves the original Result in-place, creating a new one with a reference to the original one, additionally coercing the `Err` arm of the Result via `Deref`.

###

`impl<T: Deref, E: Deref> Result<T, E>`

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####

`pub fn deref(&self) -> Result<&T::Target, &E::Target>`

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🔬 This is a nightly-only experimental API. (`inner_deref` #50264)

newly added

Converts from `&Result<T, E>` to `Result<&T::Target, &E::Target>`.

Leaves the original Result in-place, creating a new one with a reference to the original one, additionally coercing both the `Ok` and `Err` arms of the Result via `Deref`.

###

`impl<T, E> Result<Option<T>, E>`

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####

`pub fn transpose(self) -> Option<Result<T, E>>`

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🔬 This is a nightly-only experimental API. (`transpose_result` #47338)

Transposes a `Result` of an `Option` into an `Option` of a `Result`.

`Ok(None)` will be mapped to `None`. `Ok(Some(_))` and `Err(_)` will be mapped to `Some(Ok(_))` and `Some(Err(_))`.

# Examples

    #![feature(transpose_result)]

    #[derive(Debug, Eq, PartialEq)]
    struct SomeErr;

    let x: Result<Option<i32>, SomeErr> = Ok(Some(5));
    let y: Option<Result<i32, SomeErr>> = Some(Ok(5));
    assert_eq!(x.transpose(), y);Run

## Trait Implementations

###

`impl<T: Copy, E: Copy> Copy for Result<T, E>`

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###

`impl<T, E> Try for Result<T, E>`

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#### `type Ok = T`

🔬 This is a nightly-only experimental API. (`try_trait` #42327)

The type of this value when viewed as successful.

#### `type Error = E`

🔬 This is a nightly-only experimental API. (`try_trait` #42327)

The type of this value when viewed as failed.

####

`fn into_result(self) -> Self`

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🔬 This is a nightly-only experimental API. (`try_trait` #42327)

Applies the "?" operator. A return of `Ok(t)` means that the execution should continue normally, and the result of `?` is the value `t`. A return of `Err(e)` means that execution should branch to the innermost enclosing `catch`, or return from the function. Read more

####

`fn from_ok(v: T) -> Self`

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🔬 This is a nightly-only experimental API. (`try_trait` #42327)

Wrap an OK value to construct the composite result. For example, `Result::Ok(x)` and `Result::from_ok(x)` are equivalent. Read more

####

`fn from_error(v: E) -> Self`

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🔬 This is a nightly-only experimental API. (`try_trait` #42327)

Wrap an error value to construct the composite result. For example, `Result::Err(x)` and `Result::from_error(x)` are equivalent. Read more

###

`impl<T: PartialEq, E: PartialEq> PartialEq<Result<T, E>> for Result<T, E>`

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####

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

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

####

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

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This method tests for `!=`.

###

`impl<T: Eq, E: Eq> Eq for Result<T, E>`

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###

`impl<T: Ord, E: Ord> Ord for Result<T, E>`

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####

`fn cmp(&self, other: &Result<T, E>) -> Ordering`

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This method returns an `Ordering` between `self` and `other`. Read more

####

`fn max(self, other: Self) -> Self where Self: Sized,`

1.21.0
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Compares and returns the maximum of two values. Read more

####

`fn min(self, other: Self) -> Self where Self: Sized,`

1.21.0
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Compares and returns the minimum of two values. Read more

###

`impl<T: PartialOrd, E: PartialOrd> PartialOrd<Result<T, E>> for Result<T, E>`

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####

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

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

####

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

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

####

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

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

####

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

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

####

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

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

###

`impl<T: Clone, E: Clone> Clone for Result<T, E>`

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####

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

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Returns a copy of the value. Read more

####

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

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Performs copy-assignment from `source`. Read more

###

`impl<A, E, V: FromIterator<A>> FromIterator<Result<A, E>> for Result<V, E>`

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####

`fn from_iter<I: IntoIterator<Item = Result<A, E>>>(iter: I) -> Result<V, E>`

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Takes each element in the `Iterator`: if it is an `Err`, no further elements are taken, and the `Err` is returned. Should no `Err` occur, a container with the values of each `Result` is returned.

Here is an example which increments every integer in a vector, checking for overflow:

    let v = vec![1, 2];
    let res: Result<Vec<u32>, &'static str> = v.iter().map(|x: &u32|
        x.checked_add(1).ok_or("Overflow!")
    ).collect();
    assert!(res == Ok(vec![2, 3]));Run

###

`impl<T, E> IntoIterator for Result<T, E>`

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#### `type Item = T`

The type of the elements being iterated over.

#### `type IntoIter = IntoIter<T>`

Which kind of iterator are we turning this into?

####
ⓘImportant traits for IntoIter<T>

### Important traits for IntoIter<T>

`impl<T> Iterator for IntoIter<T> type Item = T;`

`fn into_iter(self) -> IntoIter<T>`

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Returns a consuming iterator over the possibly contained value.

The iterator yields one value if the result is `Result::Ok`, otherwise none.

# Examples

Basic usage:

    let x: Result<u32, &str> = Ok(5);
    let v: Vec<u32> = x.into_iter().collect();
    assert_eq!(v, [5]);

    let x: Result<u32, &str> = Err("nothing!");
    let v: Vec<u32> = x.into_iter().collect();
    assert_eq!(v, []);Run

###

`impl<'a, T, E> IntoIterator for &'a Result<T, E>`

1.4.0
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#### `type Item = &'a T`

The type of the elements being iterated over.

#### `type IntoIter = Iter<'a, T>`

Which kind of iterator are we turning this into?

####
ⓘImportant traits for Iter<'a, T>

### Important traits for Iter<'a, T>

`impl<'a, T> Iterator for Iter<'a, T> type Item = &'a T;`

`fn into_iter(self) -> Iter<'a, T>`

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Creates an iterator from a value. Read more

###

`impl<'a, T, E> IntoIterator for &'a mut Result<T, E>`

1.4.0
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#### `type Item = &'a mut T`

The type of the elements being iterated over.

#### `type IntoIter = IterMut<'a, T>`

Which kind of iterator are we turning this into?

####
ⓘImportant traits for IterMut<'a, T>

### Important traits for IterMut<'a, T>

`impl<'a, T> Iterator for IterMut<'a, T> type Item = &'a mut T;`

`fn into_iter(self) -> IterMut<'a, T>`

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Creates an iterator from a value. Read more

###

`impl<T, U, E> Sum<Result<U, E>> for Result<T, E> where T: Sum<U>,`

1.16.0
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####

`fn sum<I>(iter: I) -> Result<T, E> where I: Iterator<Item = Result<U, E>>,`

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Takes each element in the `Iterator`: if it is an `Err`, no further elements are taken, and the `Err` is returned. Should no `Err` occur, the sum of all elements is returned.

# Examples

This sums up every integer in a vector, rejecting the sum if a negative element is encountered:

    let v = vec![1, 2];
    let res: Result<i32, &'static str> = v.iter().map(|&x: &i32|
        if x < 0 { Err("Negative element found") }
        else { Ok(x) }
    ).sum();
    assert_eq!(res, Ok(3));Run

###

`impl<T, U, E> Product<Result<U, E>> for Result<T, E> where T: Product<U>,`

1.16.0
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####

`fn product<I>(iter: I) -> Result<T, E> where I: Iterator<Item = Result<U, E>>,`

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Takes each element in the `Iterator`: if it is an `Err`, no further elements are taken, and the `Err` is returned. Should no `Err` occur, the product of all elements is returned.

###

`impl<T: Hash, E: Hash> Hash for Result<T, E>`

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####

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

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Feeds this value into the given [`Hasher`]. Read more

####

`fn hash_slice<H: Hasher>(data: &[Self], state: &mut H) where Self: Sized,`

1.3.0
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Feeds a slice of this type into the given [`Hasher`]. Read more

###

`impl<T: Debug, E: Debug> Debug for Result<T, E>`

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####

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

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Formats the value using the given formatter. Read more

## Auto Trait Implementations

###

`impl<T, E> Send for Result<T, E> where E: Send, T: Send,`

###

`impl<T, E> Sync for Result<T, E> where E: Sync, T: Sync,`

## Blanket Implementations

###

`impl<T, U> Into for T where U: From<T>,`

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####

`fn into(Self) -> U`

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Performs the conversion.

###

`impl<T> From for T`

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####

`fn from(T) -> T`

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Performs the conversion.

###

`impl<T, U> TryInto for T where U: TryFrom<T>,`

[src]

#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_into(Self) -> Result<U, <U as TryFrom<T>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T, U> TryFrom for T where T: From<U>,`

[src]

#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_from(U) -> Result<T, <T as TryFrom<U>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

[src]

####

`fn borrow(&Self) -> &T`

[src]

Immutably borrows from an owned value. Read more

###

`impl<T> BorrowMut for T where T: ?Sized,`

[src]

####

`fn borrow_mut(&mut Self) -> &mut T`

[src]

Mutably borrows from an owned value. Read more

###

`impl<T> Any for T where T: 'static + ?Sized,`

[src]

####

`fn get_type_id(&Self) -> TypeId`

[src]

🔬 This is a nightly-only experimental API. (`get_type_id` #27745)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

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