Enum either::Either
[−]
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pub enum Either<L, R> { Left(L), Right(R), }
Either
represents an alternative holding one value out of
either of the two possible values.
Either
is a general purpose sum type of two parts. For representing
success or error, use the regular Result<T, E>
instead.
Variants
Left(L)
A value of type L
.
Right(R)
A value of type R
.
Methods
impl<L, R> Either<L, R>
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fn is_left(&self) -> bool
fn is_right(&self) -> bool
fn left(self) -> Option<L>
fn right(self) -> Option<R>
fn as_ref(&self) -> Either<&L, &R>
fn as_mut(&mut self) -> Either<&mut L, &mut R>
fn flip(self) -> Either<R, L>
Trait Implementations
impl<L: Debug, R: Debug> Debug for Either<L, R>
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impl<L: Hash, R: Hash> Hash for Either<L, R>
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fn hash<__HLR: Hasher>(&self, __arg_0: &mut __HLR)
Feeds this value into the state given, updating the hasher as necessary.
fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher
1.3.0
Feeds a slice of this type into the state provided.
impl<L: Ord, R: Ord> Ord for Either<L, R>
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fn cmp(&self, __arg_0: &Either<L, R>) -> Ordering
This method returns an Ordering
between self
and other
. Read more
impl<L: PartialOrd, R: PartialOrd> PartialOrd for Either<L, R>
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fn partial_cmp(&self, __arg_0: &Either<L, R>) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
fn lt(&self, __arg_0: &Either<L, R>) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
fn le(&self, __arg_0: &Either<L, R>) -> bool
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
fn gt(&self, __arg_0: &Either<L, R>) -> bool
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
fn ge(&self, __arg_0: &Either<L, R>) -> bool
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
impl<L: Eq, R: Eq> Eq for Either<L, R>
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impl<L: PartialEq, R: PartialEq> PartialEq for Either<L, R>
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fn eq(&self, __arg_0: &Either<L, R>) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Either<L, R>) -> bool
This method tests for !=
.
impl<L: Clone, R: Clone> Clone for Either<L, R>
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fn clone(&self) -> Either<L, R>
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0
Performs copy-assignment from source
. Read more
impl<L: Copy, R: Copy> Copy for Either<L, R>
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impl<L, R> From<Result<R, L>> for Either<L, R>
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Convert from Result
to Either
with Ok => Right
and Err => Left
.
impl<L, R> Into<Result<R, L>> for Either<L, R>
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Convert from Either
to Result
with Right => Ok
and Left => Err
.
impl<L, R> Iterator for Either<L, R> where L: Iterator, R: Iterator<Item=L::Item>
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Either<L, R>
is an iterator if both L
and R
are iterators.
type Item = L::Item
The type of the elements being iterated over.
fn next(&mut self) -> Option<L::Item>
Advances the iterator and returns the next value. Read more
fn size_hint(&self) -> (usize, Option<usize>)
Returns the bounds on the remaining length of the iterator. Read more
fn count(self) -> usize
1.0.0
Consumes the iterator, counting the number of iterations and returning it. Read more
fn last(self) -> Option<Self::Item>
1.0.0
Consumes the iterator, returning the last element. Read more
fn nth(&mut self, n: usize) -> Option<Self::Item>
1.0.0
Consumes the n
first elements of the iterator, then returns the next()
one. Read more
fn chain<U>(self, other: U) -> Chain<Self, U::IntoIter> where U: IntoIterator<Item=Self::Item>
1.0.0
Takes two iterators and creates a new iterator over both in sequence. Read more
fn zip<U>(self, other: U) -> Zip<Self, U::IntoIter> where U: IntoIterator
1.0.0
'Zips up' two iterators into a single iterator of pairs. Read more
fn map<B, F>(self, f: F) -> Map<Self, F> where F: FnMut(Self::Item) -> B
1.0.0
Takes a closure and creates an iterator which calls that closure on each element. Read more
fn filter<P>(self, predicate: P) -> Filter<Self, P> where P: FnMut(&Self::Item) -> bool
1.0.0
Creates an iterator which uses a closure to determine if an element should be yielded. Read more
fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> where F: FnMut(Self::Item) -> Option<B>
1.0.0
Creates an iterator that both filters and maps. Read more
fn enumerate(self) -> Enumerate<Self>
1.0.0
Creates an iterator which gives the current iteration count as well as the next value. Read more
fn peekable(self) -> Peekable<Self>
1.0.0
Creates an iterator which can use peek
to look at the next element of the iterator without consuming it. Read more
fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> where P: FnMut(&Self::Item) -> bool
1.0.0
Creates an iterator that [skip()
]s elements based on a predicate. Read more
fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> where P: FnMut(&Self::Item) -> bool
1.0.0
Creates an iterator that yields elements based on a predicate. Read more
fn skip(self, n: usize) -> Skip<Self>
1.0.0
Creates an iterator that skips the first n
elements. Read more
fn take(self, n: usize) -> Take<Self>
1.0.0
Creates an iterator that yields its first n
elements. Read more
fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> where F: FnMut(&mut St, Self::Item) -> Option<B>
1.0.0
An iterator adaptor similar to [fold()
] that holds internal state and produces a new iterator. Read more
fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> where F: FnMut(Self::Item) -> U, U: IntoIterator
1.0.0
Creates an iterator that works like map, but flattens nested structure. Read more
fn fuse(self) -> Fuse<Self>
1.0.0
Creates an iterator which ends after the first None
. Read more
fn inspect<F>(self, f: F) -> Inspect<Self, F> where F: FnMut(&Self::Item) -> ()
1.0.0
Do something with each element of an iterator, passing the value on. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0
Borrows an iterator, rather than consuming it. Read more
fn collect<B>(self) -> B where B: FromIterator<Self::Item>
1.0.0
Transforms an iterator into a collection. Read more
fn partition<B, F>(self, f: F) -> (B, B) where B: Default + Extend<Self::Item>, F: FnMut(&Self::Item) -> bool
1.0.0
Consumes an iterator, creating two collections from it. Read more
fn fold<B, F>(self, init: B, f: F) -> B where F: FnMut(B, Self::Item) -> B
1.0.0
An iterator adaptor that applies a function, producing a single, final value. Read more
fn all<F>(&mut self, f: F) -> bool where F: FnMut(Self::Item) -> bool
1.0.0
Tests if every element of the iterator matches a predicate. Read more
fn any<F>(&mut self, f: F) -> bool where F: FnMut(Self::Item) -> bool
1.0.0
Tests if any element of the iterator matches a predicate. Read more
fn find<P>(&mut self, predicate: P) -> Option<Self::Item> where P: FnMut(&Self::Item) -> bool
1.0.0
Searches for an element of an iterator that satisfies a predicate. Read more
fn position<P>(&mut self, predicate: P) -> Option<usize> where P: FnMut(Self::Item) -> bool
1.0.0
Searches for an element in an iterator, returning its index. Read more
fn rposition<P>(&mut self, predicate: P) -> Option<usize> where P: FnMut(Self::Item) -> bool, Self: ExactSizeIterator + DoubleEndedIterator
1.0.0
Searches for an element in an iterator from the right, returning its index. Read more
fn max(self) -> Option<Self::Item> where Self::Item: Ord
1.0.0
Returns the maximum element of an iterator. Read more
fn min(self) -> Option<Self::Item> where Self::Item: Ord
1.0.0
Returns the minimum element of an iterator. Read more
fn max_by_key<B, F>(self, f: F) -> Option<Self::Item> where B: Ord, F: FnMut(&Self::Item) -> B
1.6.0
Returns the element that gives the maximum value from the specified function. Read more
fn min_by_key<B, F>(self, f: F) -> Option<Self::Item> where B: Ord, F: FnMut(&Self::Item) -> B
1.6.0
Returns the element that gives the minimum value from the specified function. Read more
fn rev(self) -> Rev<Self> where Self: DoubleEndedIterator
1.0.0
Reverses an iterator's direction. Read more
fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB) where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Iterator<Item=(A, B)>
1.0.0
Converts an iterator of pairs into a pair of containers. Read more
fn cloned<'a, T>(self) -> Cloned<Self> where Self: Iterator<Item=&'a T>, T: 'a + Clone
1.0.0
Creates an iterator which clone()
s all of its elements. Read more
fn cycle(self) -> Cycle<Self> where Self: Clone
1.0.0
Repeats an iterator endlessly. Read more
fn sum<S>(self) -> S where S: Sum<Self::Item>
1.11.0
Sums the elements of an iterator. Read more
fn product<P>(self) -> P where P: Product<Self::Item>
1.11.0
Iterates over the entire iterator, multiplying all the elements Read more
fn cmp<I>(self, other: I) -> Ordering where I: IntoIterator<Item=Self::Item>, Self::Item: Ord
1.5.0
Lexicographically compares the elements of this Iterator
with those of another. Read more
fn partial_cmp<I>(self, other: I) -> Option<Ordering> where I: IntoIterator, Self::Item: PartialOrd<I::Item>
1.5.0
Lexicographically compares the elements of this Iterator
with those of another. Read more
fn eq<I>(self, other: I) -> bool where I: IntoIterator, Self::Item: PartialEq<I::Item>
1.5.0
Determines if the elements of this Iterator
are equal to those of another. Read more
fn ne<I>(self, other: I) -> bool where I: IntoIterator, Self::Item: PartialEq<I::Item>
1.5.0
Determines if the elements of this Iterator
are unequal to those of another. Read more
fn lt<I>(self, other: I) -> bool where I: IntoIterator, Self::Item: PartialOrd<I::Item>
1.5.0
Determines if the elements of this Iterator
are lexicographically less than those of another. Read more
fn le<I>(self, other: I) -> bool where I: IntoIterator, Self::Item: PartialOrd<I::Item>
1.5.0
Determines if the elements of this Iterator
are lexicographically less or equal to those of another. Read more
fn gt<I>(self, other: I) -> bool where I: IntoIterator, Self::Item: PartialOrd<I::Item>
1.5.0
Determines if the elements of this Iterator
are lexicographically greater than those of another. Read more
fn ge<I>(self, other: I) -> bool where I: IntoIterator, Self::Item: PartialOrd<I::Item>
1.5.0
Determines if the elements of this Iterator
are lexicographically greater than or equal to those of another. Read more
impl<L, R> DoubleEndedIterator for Either<L, R> where L: DoubleEndedIterator, R: DoubleEndedIterator<Item=L::Item>
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fn next_back(&mut self) -> Option<L::Item>
Removes and returns an element from the end of the iterator. Read more
impl<L, R> ExactSizeIterator for Either<L, R> where L: ExactSizeIterator, R: ExactSizeIterator<Item=L::Item>
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fn len(&self) -> usize
1.0.0
Returns the exact number of times the iterator will iterate. Read more
fn is_empty(&self) -> bool
exact_size_is_empty
)Returns whether the iterator is empty. Read more
impl<L, R> Read for Either<L, R> where L: Read, R: Read
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Either<L, R>
implements Read
if both L
and R
do.
fn read(&mut self, buf: &mut [u8]) -> Result<usize>
Pull some bytes from this source into the specified buffer, returning how many bytes were read. Read more
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize>
Read all bytes until EOF in this source, placing them into buf
. Read more
fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>
1.0.0
Read all bytes until EOF in this source, placing them into buf
. Read more
fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>
1.6.0
Read the exact number of bytes required to fill buf
. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0
Creates a "by reference" adaptor for this instance of Read
. Read more
fn bytes(self) -> Bytes<Self>
1.0.0
Transforms this Read
instance to an Iterator
over its bytes. Read more
fn chars(self) -> Chars<Self>
io
): the semantics of a partial read/write of where errors happen is currently unclear and may change
Transforms this Read
instance to an Iterator
over char
s. Read more
fn chain<R>(self, next: R) -> Chain<Self, R> where R: Read
1.0.0
Creates an adaptor which will chain this stream with another. Read more
fn take(self, limit: u64) -> Take<Self>
1.0.0
Creates an adaptor which will read at most limit
bytes from it. Read more
impl<L, R> BufRead for Either<L, R> where L: BufRead, R: BufRead
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fn fill_buf(&mut self) -> Result<&[u8]>
Fills the internal buffer of this object, returning the buffer contents. Read more
fn consume(&mut self, amt: usize)
Tells this buffer that amt
bytes have been consumed from the buffer, so they should no longer be returned in calls to read
. Read more
fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> Result<usize, Error>
1.0.0
Read all bytes into buf
until the delimiter byte
is reached. Read more
fn read_line(&mut self, buf: &mut String) -> Result<usize, Error>
1.0.0
Read all bytes until a newline (the 0xA byte) is reached, and append them to the provided buffer. Read more
fn split(self, byte: u8) -> Split<Self>
1.0.0
Returns an iterator over the contents of this reader split on the byte byte
. Read more
fn lines(self) -> Lines<Self>
1.0.0
Returns an iterator over the lines of this reader. Read more
impl<L, R> Write for Either<L, R> where L: Write, R: Write
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Either<L, R>
implements Write
if both L
and R
do.
fn write(&mut self, buf: &[u8]) -> Result<usize>
Write a buffer into this object, returning how many bytes were written. Read more
fn flush(&mut self) -> Result<()>
Flush this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
1.0.0
Attempts to write an entire buffer into this write. Read more
fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>
1.0.0
Writes a formatted string into this writer, returning any error encountered. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0
Creates a "by reference" adaptor for this instance of Write
. Read more
impl<L, R, Target> AsRef<Target> for Either<L, R> where L: AsRef<Target>, R: AsRef<Target>
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fn as_ref(&self) -> &Target
Performs the conversion.
impl<L, R, Target> AsMut<Target> for Either<L, R> where L: AsMut<Target>, R: AsMut<Target>
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fn as_mut(&mut self) -> &mut Target
Performs the conversion.
impl<L, R> Deref for Either<L, R> where L: Deref, R: Deref<Target=L::Target>
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type Target = L::Target
The resulting type after dereferencing
fn deref(&self) -> &Self::Target
The method called to dereference a value
impl<L, R> DerefMut for Either<L, R> where L: DerefMut, R: DerefMut<Target=L::Target>
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fn deref_mut(&mut self) -> &mut Self::Target
The method called to mutably dereference a value
impl<L, R> Error for Either<L, R> where L: Error, R: Error
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Either
implements Error
if both L
and R
implement it.
fn description(&self) -> &str
A short description of the error. Read more
fn cause(&self) -> Option<&Error>
The lower-level cause of this error, if any. Read more