Trait stdcli::prelude::itertools::__std_iter::Extend 1.0.0
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pub trait Extend<A> { fn extend<T>(&mut self, iter: T)
where
T: IntoIterator<Item = A>; }
Extend a collection with the contents of an iterator.
Iterators produce a series of values, and collections can also be thought
of as a series of values. The Extend
trait bridges this gap, allowing you
to extend a collection by including the contents of that iterator. When
extending a collection with an already existing key, that entry is updated
or, in the case of collections that permit multiple entries with equal
keys, that entry is inserted.
Examples
Basic usage:
// You can extend a String with some chars: let mut message = String::from("The first three letters are: "); message.extend(&['a', 'b', 'c']); assert_eq!("abc", &message[29..32]);
Implementing Extend
:
// A sample collection, that's just a wrapper over Vec<T> #[derive(Debug)] struct MyCollection(Vec<i32>); // Let's give it some methods so we can create one and add things // to it. impl MyCollection { fn new() -> MyCollection { MyCollection(Vec::new()) } fn add(&mut self, elem: i32) { self.0.push(elem); } } // since MyCollection has a list of i32s, we implement Extend for i32 impl Extend<i32> for MyCollection { // This is a bit simpler with the concrete type signature: we can call // extend on anything which can be turned into an Iterator which gives // us i32s. Because we need i32s to put into MyCollection. fn extend<T: IntoIterator<Item=i32>>(&mut self, iter: T) { // The implementation is very straightforward: loop through the // iterator, and add() each element to ourselves. for elem in iter { self.add(elem); } } } let mut c = MyCollection::new(); c.add(5); c.add(6); c.add(7); // let's extend our collection with three more numbers c.extend(vec![1, 2, 3]); // we've added these elements onto the end assert_eq!("MyCollection([5, 6, 7, 1, 2, 3])", format!("{:?}", c));
Required Methods
fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = A>,
T: IntoIterator<Item = A>,
Extends a collection with the contents of an iterator.
As this is the only method for this trait, the trait-level docs contain more details.
Examples
Basic usage:
// You can extend a String with some chars: let mut message = String::from("abc"); message.extend(['d', 'e', 'f'].iter()); assert_eq!("abcdef", &message);
Implementations on Foreign Types
impl<'a, K, V, S> Extend<(&'a K, &'a V)> for LinkedHashMap<K, V, S> where
K: 'a + Hash + Eq + Copy,
S: BuildHasher,
V: 'a + Copy,
K: 'a + Hash + Eq + Copy,
S: BuildHasher,
V: 'a + Copy,
impl<K, V, S> Extend<(K, V)> for LinkedHashMap<K, V, S> where
K: Eq + Hash,
S: BuildHasher,
K: Eq + Hash,
S: BuildHasher,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = (K, V)>,
I: IntoIterator<Item = (K, V)>,
impl<'a, T> Extend<&'a T> for VecDeque<T> where
T: 'a + Copy,
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T: 'a + Copy,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a T>,
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I: IntoIterator<Item = &'a T>,
impl<'a> Extend<&'a char> for String
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fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a char>,
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I: IntoIterator<Item = &'a char>,
impl<T> Extend<T> for BTreeSet<T> where
T: Ord,
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T: Ord,
fn extend<Iter>(&mut self, iter: Iter) where
Iter: IntoIterator<Item = T>,
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Iter: IntoIterator<Item = T>,
impl<T> Extend<T> for BinaryHeap<T> where
T: Ord,
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T: Ord,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = T>,
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I: IntoIterator<Item = T>,
impl<'a, T> Extend<&'a T> for BinaryHeap<T> where
T: 'a + Copy + Ord,
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T: 'a + Copy + Ord,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a T>,
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I: IntoIterator<Item = &'a T>,
impl<A> Extend<A> for VecDeque<A>
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fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = A>,
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T: IntoIterator<Item = A>,
impl<'a, K, V> Extend<(&'a K, &'a V)> for BTreeMap<K, V> where
K: Copy + Ord,
V: Copy,
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K: Copy + Ord,
V: Copy,
impl<'a> Extend<&'a str> for String
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fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a str>,
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I: IntoIterator<Item = &'a str>,
impl<T> Extend<T> for LinkedList<T>
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fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = T>,
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I: IntoIterator<Item = T>,
impl<'a, T> Extend<&'a T> for LinkedList<T> where
T: 'a + Copy,
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T: 'a + Copy,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a T>,
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I: IntoIterator<Item = &'a T>,
impl<K, V> Extend<(K, V)> for BTreeMap<K, V> where
K: Ord,
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K: Ord,
fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = (K, V)>,
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T: IntoIterator<Item = (K, V)>,
impl<T> Extend<T> for Vec<T>
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fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = T>,
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I: IntoIterator<Item = T>,
impl<'a, T> Extend<&'a T> for BTreeSet<T> where
T: 'a + Copy + Ord,
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T: 'a + Copy + Ord,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a T>,
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I: IntoIterator<Item = &'a T>,
impl Extend<char> for String
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fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = char>,
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I: IntoIterator<Item = char>,
impl<'a, T> Extend<&'a T> for Vec<T> where
T: 'a + Copy,
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T: 'a + Copy,
Extend implementation that copies elements out of references before pushing them onto the Vec.
This implementation is specialized for slice iterators, where it uses copy_from_slice
to
append the entire slice at once.
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a T>,
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I: IntoIterator<Item = &'a T>,
impl<'a> Extend<Cow<'a, str>> for String
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fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = Cow<'a, str>>,
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I: IntoIterator<Item = Cow<'a, str>>,
impl Extend<String> for String
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fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = String>,
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I: IntoIterator<Item = String>,
impl Extend<Flags> for Flags
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fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = Flags>,
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T: IntoIterator<Item = Flags>,
impl<'a> Extend<&'a u8> for BytesMut
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fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = &'a u8>,
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T: IntoIterator<Item = &'a u8>,
impl<'a> Extend<&'a u8> for Bytes
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fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = &'a u8>,
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T: IntoIterator<Item = &'a u8>,
impl Extend<u8> for BytesMut
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fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = u8>,
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T: IntoIterator<Item = u8>,
impl Extend<u8> for Bytes
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fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = u8>,
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T: IntoIterator<Item = u8>,
impl<P> Extend<P> for PathBuf where
P: AsRef<Path>,
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P: AsRef<Path>,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = P>,
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I: IntoIterator<Item = P>,
impl<K, V, S> Extend<(K, V)> for HashMap<K, V, S> where
K: Eq + Hash,
S: BuildHasher,
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K: Eq + Hash,
S: BuildHasher,
fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = (K, V)>,
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T: IntoIterator<Item = (K, V)>,
impl<'a, T, S> Extend<&'a T> for HashSet<T, S> where
S: BuildHasher,
T: 'a + Eq + Hash + Copy,
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S: BuildHasher,
T: 'a + Eq + Hash + Copy,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a T>,
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I: IntoIterator<Item = &'a T>,
impl<T, S> Extend<T> for HashSet<T, S> where
S: BuildHasher,
T: Eq + Hash,
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S: BuildHasher,
T: Eq + Hash,
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = T>,
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I: IntoIterator<Item = T>,
impl<'a, K, V, S> Extend<(&'a K, &'a V)> for HashMap<K, V, S> where
K: Eq + Hash + Copy,
S: BuildHasher,
V: Copy,
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K: Eq + Hash + Copy,
S: BuildHasher,
V: Copy,
impl<'a, V> Extend<(usize, &'a V)> for VecMap<V> where
V: Copy,
V: Copy,
impl<V> Extend<(usize, V)> for VecMap<V>
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = (usize, V)>,
I: IntoIterator<Item = (usize, V)>,
impl Extend<OFlag> for OFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = OFlag>,
T: IntoIterator<Item = OFlag>,
impl Extend<SealFlag> for SealFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = SealFlag>,
T: IntoIterator<Item = SealFlag>,
impl Extend<MsgFlags> for MsgFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = MsgFlags>,
T: IntoIterator<Item = MsgFlags>,
impl Extend<Mode> for Mode
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = Mode>,
T: IntoIterator<Item = Mode>,
impl Extend<MQ_OFlag> for MQ_OFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = MQ_OFlag>,
T: IntoIterator<Item = MQ_OFlag>,
impl Extend<EpollFlags> for EpollFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = EpollFlags>,
T: IntoIterator<Item = EpollFlags>,
impl Extend<FsFlags> for FsFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = FsFlags>,
T: IntoIterator<Item = FsFlags>,
impl Extend<FdFlag> for FdFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = FdFlag>,
T: IntoIterator<Item = FdFlag>,
impl Extend<QuotaValidFlags> for QuotaValidFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = QuotaValidFlags>,
T: IntoIterator<Item = QuotaValidFlags>,
impl Extend<SockFlag> for SockFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = SockFlag>,
T: IntoIterator<Item = SockFlag>,
impl Extend<WaitPidFlag> for WaitPidFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = WaitPidFlag>,
T: IntoIterator<Item = WaitPidFlag>,
impl Extend<MemFdCreateFlag> for MemFdCreateFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = MemFdCreateFlag>,
T: IntoIterator<Item = MemFdCreateFlag>,
impl Extend<EpollCreateFlags> for EpollCreateFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = EpollCreateFlags>,
T: IntoIterator<Item = EpollCreateFlags>,
impl Extend<EventFlags> for EventFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = EventFlags>,
T: IntoIterator<Item = EventFlags>,
impl Extend<MntFlags> for MntFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = MntFlags>,
T: IntoIterator<Item = MntFlags>,
impl Extend<SaFlags> for SaFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = SaFlags>,
T: IntoIterator<Item = SaFlags>,
impl Extend<SFlag> for SFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = SFlag>,
T: IntoIterator<Item = SFlag>,
impl Extend<ControlFlags> for ControlFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = ControlFlags>,
T: IntoIterator<Item = ControlFlags>,
impl Extend<InputFlags> for InputFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = InputFlags>,
T: IntoIterator<Item = InputFlags>,
impl Extend<CloneFlags> for CloneFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = CloneFlags>,
T: IntoIterator<Item = CloneFlags>,
impl Extend<ProtFlags> for ProtFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = ProtFlags>,
T: IntoIterator<Item = ProtFlags>,
impl Extend<SpliceFFlags> for SpliceFFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = SpliceFFlags>,
T: IntoIterator<Item = SpliceFFlags>,
impl Extend<FdFlag> for FdFlag
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = FdFlag>,
T: IntoIterator<Item = FdFlag>,
impl Extend<MsFlags> for MsFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = MsFlags>,
T: IntoIterator<Item = MsFlags>,
impl Extend<LocalFlags> for LocalFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = LocalFlags>,
T: IntoIterator<Item = LocalFlags>,
impl Extend<MsFlags> for MsFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = MsFlags>,
T: IntoIterator<Item = MsFlags>,
impl Extend<OutputFlags> for OutputFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = OutputFlags>,
T: IntoIterator<Item = OutputFlags>,
impl Extend<MapFlags> for MapFlags
fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = MapFlags>,
T: IntoIterator<Item = MapFlags>,
impl<A> Extend<<A as Array>::Item> for SmallVec<A> where
A: Array,
A: Array,
fn extend<I>(&mut self, iterable: I) where
I: IntoIterator<Item = <A as Array>::Item>,
I: IntoIterator<Item = <A as Array>::Item>,
impl Extend<SslVerifyMode> for SslVerifyMode
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fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = SslVerifyMode>,
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T: IntoIterator<Item = SslVerifyMode>,
impl Extend<SslMode> for SslMode
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fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = SslMode>,
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T: IntoIterator<Item = SslMode>,
impl Extend<SslOption> for SslOption
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fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = SslOption>,
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T: IntoIterator<Item = SslOption>,
impl Extend<Flag> for Flag
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fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = Flag>,
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T: IntoIterator<Item = Flag>,
impl Extend<u8> for Chunk
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fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = u8>,
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T: IntoIterator<Item = u8>,
impl<A> Extend<<A as Array>::Item> for SmallVec<A> where
A: Array,
A: Array,
fn extend<I>(&mut self, iterable: I) where
I: IntoIterator<Item = <A as Array>::Item>,
I: IntoIterator<Item = <A as Array>::Item>,
impl Extend<Flags> for Flags
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fn extend<T>(&mut self, iterator: T) where
T: IntoIterator<Item = Flags>,
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T: IntoIterator<Item = Flags>,