Trait otter_api_tests::otter_support::crates::otter_base::crates::itertools::__std_iter::Extend
1.0.0 · source · [−]pub trait Extend<A> {
fn extend<T>(&mut self, iter: T)
where
T: IntoIterator<Item = A>;
fn extend_one(&mut self, item: A) { ... }
fn extend_reserve(&mut self, additional: usize) { ... }
}
Expand description
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>,
fn extend<T>(&mut self, iter: T) where
T: IntoIterator<Item = A>,
Extends a collection with the contents of an iterator.
As this is the only required 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);
Provided Methods
fn extend_one(&mut self, item: A)
fn extend_one(&mut self, item: A)
extend_one
)Extends a collection with exactly one element.
fn extend_reserve(&mut self, additional: usize)
fn extend_reserve(&mut self, additional: usize)
extend_one
)Reserves capacity in a collection for the given number of additional elements.
The default implementation does nothing.
Implementors
impl Extend<(String, Value)> for otter_api_tests::tera::Map<String, Value>
impl Extend<(String, Value)> for otter_api_tests::otter_support::crates::toml::value::Map<String, Value>
impl Extend<Signal> for SigSet
impl Extend<char> for String
impl Extend<u8> for BytesMut
impl Extend<()> for ()
impl Extend<AtFlags> for AtFlags
impl Extend<FallocateFlags> for FallocateFlags
impl Extend<FdFlag> for otter_api_tests::otter_support::crates::nix::fcntl::FdFlag
impl Extend<OFlag> for OFlag
impl Extend<RenameFlags> for RenameFlags
impl Extend<SealFlag> for SealFlag
impl Extend<SpliceFFlags> for SpliceFFlags
impl Extend<DeleteModuleFlags> for DeleteModuleFlags
impl Extend<ModuleInitFlags> for ModuleInitFlags
impl Extend<MntFlags> for MntFlags
impl Extend<MsFlags> for otter_api_tests::otter_support::crates::nix::mount::MsFlags
impl Extend<FdFlag> for otter_api_tests::otter_support::crates::nix::mqueue::FdFlag
impl Extend<MQ_OFlag> for MQ_OFlag
impl Extend<InterfaceFlags> for InterfaceFlags
impl Extend<PollFlags> for PollFlags
impl Extend<CloneFlags> for CloneFlags
impl Extend<EpollCreateFlags> for EpollCreateFlags
impl Extend<EpollFlags> for EpollFlags
impl Extend<EfdFlags> for EfdFlags
impl Extend<AddWatchFlags> for AddWatchFlags
impl Extend<InitFlags> for InitFlags
impl Extend<MemFdCreateFlag> for MemFdCreateFlag
impl Extend<MRemapFlags> for MRemapFlags
impl Extend<MapFlags> for MapFlags
impl Extend<MlockAllFlags> for MlockAllFlags
impl Extend<MsFlags> for otter_api_tests::otter_support::crates::nix::sys::mman::MsFlags
impl Extend<ProtFlags> for ProtFlags
impl Extend<Persona> for Persona
impl Extend<Options> for Options
impl Extend<QuotaValidFlags> for QuotaValidFlags
impl Extend<SaFlags> for SaFlags
impl Extend<SfdFlags> for SfdFlags
impl Extend<MsgFlags> for MsgFlags
impl Extend<SockFlag> for SockFlag
impl Extend<TimestampingFlag> for TimestampingFlag
impl Extend<Mode> for Mode
impl Extend<SFlag> for SFlag
impl Extend<FsFlags> for FsFlags
impl Extend<ControlFlags> for ControlFlags
impl Extend<InputFlags> for InputFlags
impl Extend<LocalFlags> for LocalFlags
impl Extend<OutputFlags> for OutputFlags
impl Extend<TimerSetTimeFlags> for TimerSetTimeFlags
impl Extend<TimerFlags> for TimerFlags
impl Extend<WaitPidFlag> for WaitPidFlag
impl Extend<AccessFlags> for AccessFlags
impl Extend<Box<str, Global>> for String
impl Extend<String> for String
impl Extend<OsString> for OsString
impl Extend<CMSOptions> for CMSOptions
impl Extend<OcspFlag> for OcspFlag
impl Extend<Pkcs7Flags> for Pkcs7Flags
impl Extend<ExtensionContext> for ExtensionContext
impl Extend<ShutdownState> for ShutdownState
impl Extend<SslMode> for SslMode
impl Extend<SslOptions> for SslOptions
impl Extend<SslSessionCacheMode> for SslSessionCacheMode
impl Extend<SslVerifyMode> for SslVerifyMode
impl Extend<X509CheckFlags> for X509CheckFlags
impl Extend<X509VerifyFlags> for X509VerifyFlags
impl Extend<EventMask> for EventMask
impl Extend<FileType> for FileType
impl Extend<Op> for Op
impl Extend<Transformations> for Transformations
impl Extend<WatchMask> for WatchMask
impl<'a> Extend<&'a char> for String
impl<'a> Extend<&'a str> for String
impl<'a> Extend<&'a u8> for BytesMut
impl<'a> Extend<&'a OsStr> for OsString
impl<'a> Extend<Cow<'a, str>> for String
impl<'a> Extend<Cow<'a, OsStr>> for OsString
impl<'a, I, T> Extend<&'a T> for IndexVec<I, T> where
I: Idx,
T: 'a + Copy,
impl<'a, K, V> Extend<(&'a K, &'a V)> for EnumMap<K, V> where
K: EnumArray<V> + Copy,
V: Copy,
impl<'a, K, V> Extend<(K, &'a V)> for SecondaryMap<K, V> where
K: Key,
V: 'a + Copy,
impl<'a, K, V, A> Extend<(&'a K, &'a V)> for BTreeMap<K, V, A> where
K: Ord + Copy,
V: Copy,
A: Allocator + Clone,
impl<'a, K, V, S> Extend<(&'a K, &'a V)> for otter_api_tests::HashMap<K, V, S> where
K: Eq + Hash + Copy,
V: Copy,
S: BuildHasher,
impl<'a, K, V, S> Extend<(&'a K, &'a V)> for IndexMap<K, V, S> where
K: Hash + Eq + Copy,
V: Copy,
S: BuildHasher,
impl<'a, K, V, S> Extend<(K, &'a V)> for SparseSecondaryMap<K, V, S> where
K: Key,
V: 'a + Copy,
S: BuildHasher,
impl<'a, K, V, S, A> Extend<(&'a K, &'a V)> for HashMap<K, V, S, A> where
K: Eq + Hash + Copy,
V: Copy,
S: BuildHasher,
A: Allocator + Clone,
impl<'a, T> Extend<&'a T> for BinaryHeap<T> where
T: 'a + Ord + Copy,
impl<'a, T> Extend<&'a T> for LinkedList<T> where
T: 'a + Copy,
impl<'a, T, A> Extend<&'a T> for BTreeSet<T, A> where
T: 'a + Ord + Copy,
A: Allocator + Clone,
impl<'a, T, A> Extend<&'a T> for VecDeque<T, A> where
T: 'a + Copy,
A: Allocator,
impl<'a, T, A> Extend<&'a T> for Vec<T, A> where
T: 'a + Copy,
A: 'a + Allocator,
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.
impl<'a, T, S> Extend<&'a T> for otter_api_tests::HashSet<T, S> where
T: 'a + Eq + Hash + Copy,
S: BuildHasher,
impl<'a, T, S> Extend<&'a T> for IndexSet<T, S> where
T: 'a + Hash + Eq + Copy,
S: BuildHasher,
impl<'a, T, S, A> Extend<&'a T> for HashSet<T, S, A> where
T: 'a + Eq + Hash + Copy,
S: BuildHasher,
A: Allocator + Clone,
impl<'a, V> Extend<(usize, &'a V)> for VecMap<V> where
V: Copy,
impl<'entries, EntryData> Extend<&'entries EntryData> for VecList<EntryData> where
EntryData: 'entries + Copy,
impl<'s, T> Extend<T> for SliceVec<'s, T>
impl<A> Extend<<A as Array>::Item> for ArrayVec<A> where
A: Array,
impl<A> Extend<<A as Array>::Item> for SmallVec<A> where
A: Array,
impl<A> Extend<<A as Array>::Item> for TinyVec<A> where
A: Array,
impl<A, B, ExtendA, ExtendB> Extend<(A, B)> for (ExtendA, ExtendB) where
ExtendA: Extend<A>,
ExtendB: Extend<B>,
impl<EntryData> Extend<EntryData> for VecList<EntryData>
impl<Fut> Extend<Fut> for FuturesOrdered<Fut> where
Fut: Future,
impl<Fut> Extend<Fut> for FuturesUnordered<Fut>
impl<I, T> Extend<T> for IndexVec<I, T> where
I: Idx,
impl<K, V> Extend<(K, V)> for EnumMap<K, V> where
K: EnumArray<V>,
impl<K, V> Extend<(K, V)> for SecondaryMap<K, V> where
K: Key,
impl<K, V, A> Extend<(K, V)> for BTreeMap<K, V, A> where
K: Ord,
A: Allocator + Clone,
impl<K, V, S> Extend<(K, V)> for otter_api_tests::HashMap<K, V, S> where
K: Eq + Hash,
S: BuildHasher,
Inserts all new key-values from the iterator and replaces values with existing keys with new values returned from the iterator.
impl<K, V, S> Extend<(K, V)> for SparseSecondaryMap<K, V, S> where
K: Key,
S: BuildHasher,
impl<K, V, S> Extend<(K, V)> for IndexMap<K, V, S> where
K: Hash + Eq,
S: BuildHasher,
impl<K, V, S, A> Extend<(K, V)> for HashMap<K, V, S, A> where
K: Eq + Hash,
S: BuildHasher,
A: Allocator + Clone,
Inserts all new key-values from the iterator and replaces values with existing keys with new values returned from the iterator.
impl<L, R, A> Extend<A> for Either<L, R> where
L: Extend<A>,
R: Extend<A>,
impl<P> Extend<P> for PathBuf where
P: AsRef<Path>,
impl<St> Extend<St> for SelectAll<St> where
St: Stream + Unpin,
impl<T> Extend<(Option<HeaderName>, T)> for HeaderMap<T>
impl<T> Extend<(HeaderName, T)> for HeaderMap<T>
impl<T> Extend<T> for BinaryHeap<T> where
T: Ord,
impl<T> Extend<T> for LinkedList<T>
impl<T, A> Extend<T> for BTreeSet<T, A> where
T: Ord,
A: Allocator + Clone,
impl<T, A> Extend<T> for VecDeque<T, A> where
A: Allocator,
impl<T, A> Extend<T> for Vec<T, A> where
A: Allocator,
impl<T, S> Extend<T> for otter_api_tests::HashSet<T, S> where
T: Eq + Hash,
S: BuildHasher,
impl<T, S> Extend<T> for IndexSet<T, S> where
T: Hash + Eq,
S: BuildHasher,
impl<T, S, A> Extend<T> for HashSet<T, S, A> where
T: Eq + Hash,
S: BuildHasher,
A: Allocator + Clone,
impl<T, const CAP: usize> Extend<T> for otter_api_tests::ArrayVec<T, CAP>
Extend the ArrayVec
with an iterator.
Panics if extending the vector exceeds its capacity.