Trait tor_hsservice::internal_prelude::iter::Extend
1.0.0 · source · pub trait Extend<A> {
// Required method
fn extend<T>(&mut self, iter: T)
where T: IntoIterator<Item = A>;
// Provided methods
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§
1.0.0 · sourcefn 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
// 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§
sourcefn extend_one(&mut self, item: A)
🔬This is a nightly-only experimental API. (extend_one
)
fn extend_one(&mut self, item: A)
extend_one
)Extends a collection with exactly one element.
sourcefn extend_reserve(&mut self, additional: usize)
🔬This is a nightly-only experimental API. (extend_one
)
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.
Object Safety§
Implementors§
impl Extend<(String, Value)> for serde_json::map::Map<String, Value>
impl Extend<(String, Value)> for Map<String, Value>
impl Extend<char> for String
no_global_oom_handling
only.impl Extend<u8> for BytesMut
impl Extend<()> for ()
impl Extend<String> for String
no_global_oom_handling
only.impl Extend<OsString> for OsString
impl Extend<CipherCtxFlags> for CipherCtxFlags
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<Access> for Access
impl Extend<Access> for Access
impl Extend<AtFlags> for AtFlags
impl Extend<AtFlags> for AtFlags
impl Extend<BeginFlags> for BeginFlags
impl Extend<Bytes> for BytesMut
impl Extend<ControlModes> for ControlModes
impl Extend<CreateFlags> for CreateFlags
impl Extend<CreateFlags> for CreateFlags
impl Extend<CreateFlags> for CreateFlags
impl Extend<CreateFlags> for CreateFlags
impl Extend<DupFlags> for DupFlags
impl Extend<DupFlags> for DupFlags
impl Extend<EventFlags> for EventFlags
impl Extend<EventFlags> for EventFlags
impl Extend<EventfdFlags> for EventfdFlags
impl Extend<EventfdFlags> for EventfdFlags
impl Extend<FallocateFlags> for FallocateFlags
impl Extend<FallocateFlags> for FallocateFlags
impl Extend<FdFlags> for FdFlags
impl Extend<FdFlags> for FdFlags
impl Extend<FloatingPointEmulationControl> for FloatingPointEmulationControl
impl Extend<FloatingPointExceptionMode> for FloatingPointExceptionMode
impl Extend<IFlags> for IFlags
impl Extend<InputModes> for InputModes
impl Extend<LocalModes> for LocalModes
impl Extend<MembarrierQuery> for MembarrierQuery
impl Extend<MemfdFlags> for MemfdFlags
impl Extend<MemfdFlags> for MemfdFlags
impl Extend<Mode> for Mode
impl Extend<Mode> for Mode
impl Extend<MountFlags> for MountFlags
impl Extend<MountFlags> for MountFlags
impl Extend<MountPropagationFlags> for MountPropagationFlags
impl Extend<MountPropagationFlags> for MountPropagationFlags
impl Extend<OFlags> for OFlags
impl Extend<OFlags> for OFlags
impl Extend<OutputModes> for OutputModes
impl Extend<PidfdFlags> for PidfdFlags
impl Extend<PidfdGetfdFlags> for PidfdGetfdFlags
impl Extend<PipeFlags> for PipeFlags
impl Extend<PipeFlags> for PipeFlags
impl Extend<PollFlags> for PollFlags
impl Extend<PollFlags> for PollFlags
impl Extend<ReadWriteFlags> for ReadWriteFlags
impl Extend<ReadWriteFlags> for ReadWriteFlags
impl Extend<RecvFlags> for RecvFlags
impl Extend<RelayFlags> for RelayFlags
impl Extend<RenameFlags> for RenameFlags
impl Extend<RenameFlags> for RenameFlags
impl Extend<ResolveFlags> for ResolveFlags
impl Extend<ResolveFlags> for ResolveFlags
impl Extend<SealFlags> for SealFlags
impl Extend<SealFlags> for SealFlags
impl Extend<SendFlags> for SendFlags
impl Extend<SockaddrXdpFlags> for SockaddrXdpFlags
impl Extend<SocketFlags> for SocketFlags
impl Extend<SpeculationFeatureControl> for SpeculationFeatureControl
impl Extend<SpeculationFeatureState> for SpeculationFeatureState
impl Extend<SpliceFlags> for SpliceFlags
impl Extend<SpliceFlags> for SpliceFlags
impl Extend<StatVfsMountFlags> for StatVfsMountFlags
impl Extend<StatVfsMountFlags> for StatVfsMountFlags
impl Extend<StatxFlags> for StatxFlags
impl Extend<StatxFlags> for StatxFlags
impl Extend<Table> for ArrayOfTables
impl Extend<TimerfdFlags> for TimerfdFlags
impl Extend<TimerfdTimerFlags> for TimerfdTimerFlags
impl Extend<TrustAnchor<'static>> for RootCertStore
impl Extend<UnalignedAccessControl> for UnalignedAccessControl
impl Extend<UnmountFlags> for UnmountFlags
impl Extend<UnmountFlags> for UnmountFlags
impl Extend<WaitOptions> for WaitOptions
impl Extend<WaitidOptions> for WaitidOptions
impl Extend<WatchFlags> for WatchFlags
impl Extend<WatchFlags> for WatchFlags
impl Extend<XattrFlags> for XattrFlags
impl Extend<XattrFlags> for XattrFlags
impl Extend<XdpDescOptions> for XdpDescOptions
impl Extend<XdpOptionsFlags> for XdpOptionsFlags
impl Extend<XdpRingFlags> for XdpRingFlags
impl Extend<XdpUmemRegFlags> for XdpUmemRegFlags
impl<'a> Extend<&'a char> for String
no_global_oom_handling
only.impl<'a> Extend<&'a str> for String
no_global_oom_handling
only.impl<'a> Extend<&'a u8> for BytesMut
impl<'a> Extend<&'a u8> for PrefixedPayload
impl<'a> Extend<&'a OsStr> for OsString
impl<'a> Extend<Cow<'a, str>> for String
no_global_oom_handling
only.impl<'a> Extend<Cow<'a, OsStr>> for OsString
impl<'a, K, V> Extend<&'a V> for TiVec<K, V>where
V: 'a + Copy,
impl<'a, K, V, A> Extend<(&'a K, &'a V)> for BTreeMap<K, V, A>
impl<'a, K, V, S> Extend<(&'a <K as WeakElement>::Strong, &'a V)> for PtrWeakKeyHashMap<K, V, S>where
K: 'a + WeakElement,
<K as WeakElement>::Strong: Clone + Deref,
V: 'a + Clone,
S: BuildHasher,
impl<'a, K, V, S> Extend<(&'a <K as WeakElement>::Strong, &'a V)> for WeakKeyHashMap<K, V, S>
impl<'a, K, V, S> Extend<(&'a K, &'a <V as WeakElement>::Strong)> for WeakValueHashMap<K, V, S>where
K: 'a + Eq + Hash + Clone,
V: 'a + WeakElement,
<V as WeakElement>::Strong: Clone,
S: BuildHasher,
impl<'a, K, V, S> Extend<(&'a K, &'a V)> for tor_hsservice::internal_prelude::HashMap<K, V, S>
impl<'a, K, V, S> Extend<(&'a K, &'a V)> for IndexMap<K, V, S>
impl<'a, K, V, S, A> Extend<&'a (K, V)> for HashMap<K, V, S, A>
Inserts all new key-values from the iterator and replaces values with existing keys with new values returned from the iterator.
impl<'a, K, V, S, A> Extend<(&'a K, &'a V)> for HashMap<K, V, S, A>
Inserts all new key-values from the iterator and replaces values with existing keys with new values returned from the iterator.
impl<'a, M, T1, T2, O1, O2> Extend<BitRef<'a, M, T2, O2>> for BitVec<T1, O1>where
M: Mutability,
T1: BitStore,
T2: BitStore,
O1: BitOrder,
O2: BitOrder,
tarpaulin_include
only.§Bit-Vector Extension by Proxy References
DO NOT use this. You clearly have a bit-slice. Use
.extend_from_bitslice()
instead!
Iterating over a bit-slice requires loading from memory and constructing a proxy reference for each bit. This is needlessly slow; the specialized method is able to avoid this per-bit cost and possibly even use batched operations.
impl<'a, T, A> Extend<&'a T> for BinaryHeap<T, A>
impl<'a, T, A> Extend<&'a T> for VecDeque<T, A>
impl<'a, T, A> Extend<&'a T> for BTreeSet<T, A>
impl<'a, T, A> Extend<&'a T> for LinkedList<T, A>
impl<'a, T, A> Extend<&'a T> for alloc::vec::Vec<T, A>
no_global_oom_handling
only.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, A> Extend<&'a T> for Vec<T, A>where
T: Copy + 'a,
A: Allocator + 'a,
no_global_oom_handling
only.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, O> Extend<&'a bool> for BitVec<T, O>where
T: BitStore,
O: BitOrder,
tarpaulin_include
only.impl<'a, T, O> Extend<&'a T> for BitVec<T, O>where
T: BitStore,
O: BitOrder,
tarpaulin_include
only.impl<'a, T, S> Extend<&'a T> for tor_hsservice::internal_prelude::HashSet<T, S>
impl<'a, T, S> Extend<&'a T> for IndexSet<T, S>
impl<'a, T, S, A> Extend<&'a T> for HashSet<T, S, A>
impl<'s, T> Extend<T> for SliceVec<'s, T>
impl<'slice, 'fd> Extend<SendAncillaryMessage<'slice, 'fd>> for SendAncillaryBuffer<'_, 'slice, 'fd>
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> Extend<Box<str, A>> for Stringwhere
A: Allocator,
no_global_oom_handling
only.impl<A> Extend<A> for AsciiStringwhere
A: AsRef<AsciiStr>,
impl<A> Extend<Box<str, A>> for Stringwhere
A: Allocator,
alloc
only.impl<A, B, ExtendA, ExtendB> Extend<(A, B)> for (ExtendA, ExtendB)
impl<E, T> Extend<T> for RetryError<E>where
T: Into<E>,
impl<Fut> Extend<Fut> for FuturesOrdered<Fut>where
Fut: Future,
impl<Fut> Extend<Fut> for FuturesUnordered<Fut>
impl<ID> Extend<ID> for RelayIdSetwhere
ID: Into<RelayId>,
impl<K, V> Extend<(Range<K>, V)> for RangeMap<K, V>
impl<K, V> Extend<(RangeInclusive<K>, V)> for RangeInclusiveMap<K, V>
impl<K, V> Extend<(K, V)> for InlineTable
impl<K, V> Extend<(K, V)> for Table
impl<K, V> Extend<V> for TiVec<K, V>
impl<K, V, A> Extend<(K, V)> for BTreeMap<K, V, A>
impl<K, V, S> Extend<(<K as WeakElement>::Strong, <V as WeakElement>::Strong)> for PtrWeakWeakHashMap<K, V, S>
impl<K, V, S> Extend<(<K as WeakElement>::Strong, <V as WeakElement>::Strong)> for WeakWeakHashMap<K, V, S>
impl<K, V, S> Extend<(<K as WeakElement>::Strong, V)> for PtrWeakKeyHashMap<K, V, S>
impl<K, V, S> Extend<(<K as WeakElement>::Strong, V)> for WeakKeyHashMap<K, V, S>where
K: WeakKey,
S: BuildHasher,
impl<K, V, S> Extend<(K, <V as WeakElement>::Strong)> for WeakValueHashMap<K, V, S>
impl<K, V, S> Extend<(K, V)> for tor_hsservice::internal_prelude::HashMap<K, V, S>
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 IndexMap<K, V, S>
impl<K, V, S, A> Extend<(K, V)> for HashMap<K, V, S, A>
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>
impl<P> Extend<P> for tor_hsservice::internal_prelude::PathBuf
impl<P> Extend<P> for PathBufwhere
P: AsRef<Path>,
impl<St> Extend<St> for SelectAll<St>
impl<T> Extend<(Option<HeaderName>, T)> for HeaderMap<T>
impl<T> Extend<(HeaderName, T)> for HeaderMap<T>
impl<T> Extend<Range<T>> for RangeSet<T>
impl<T> Extend<RangeInclusive<T>> for RangeInclusiveSet<T>
impl<T> Extend<T> for BoundedVecDeque<T>
impl<T, A> Extend<T> for BinaryHeap<T, A>
impl<T, A> Extend<T> for VecDeque<T, A>where
A: Allocator,
impl<T, A> Extend<T> for BTreeSet<T, A>
impl<T, A> Extend<T> for LinkedList<T, A>where
A: Allocator,
impl<T, A> Extend<T> for alloc::vec::Vec<T, A>where
A: Allocator,
no_global_oom_handling
only.impl<T, A> Extend<T> for Vec<T, A>where
A: Allocator,
no_global_oom_handling
only.impl<T, O> Extend<bool> for BitVec<T, O>where
T: BitStore,
O: BitOrder,
§Bit-Vector Extension
This extends a bit-vector from anything that produces individual bits.
§Original
§Notes
This .extend()
call is the second-slowest possible way to append bits into a
bit-vector, faster only than calling iter.for_each(|bit| bv.push(bit))
.
DO NOT use this if you have any other choice.
If you are extending a bit-vector from the contents of a bit-slice, then you
should use .extend_from_bitslice()
instead. That method is specialized to
perform upfront allocation and, where possible, use a batch copy rather than
copying each bit individually from the source into the bit-vector.
impl<T, O> Extend<T> for BitVec<T, O>where
T: BitStore,
O: BitOrder,
impl<T, S> Extend<<T as WeakElement>::Strong> for PtrWeakHashSet<T, S>
impl<T, S> Extend<<T as WeakElement>::Strong> for WeakHashSet<T, S>where
T: WeakKey,
S: BuildHasher,
impl<T, S> Extend<T> for tor_hsservice::internal_prelude::HashSet<T, S>
impl<T, S> Extend<T> for IndexSet<T, S>
impl<T, S, A> Extend<T> for HashSet<T, S, A>
impl<T, const CAP: usize> Extend<T> for arrayvec::arrayvec::ArrayVec<T, CAP>
Extend the ArrayVec
with an iterator.
Panics if extending the vector exceeds its capacity.