Trait geng::prelude::itertools::__std_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§

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§

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

The default implementation does nothing.

Object Safety§

This trait is not object safe.

Implementors§

impl Extend<(String, Value)> for geng::prelude::serde_json::Map<String, Value>

impl Extend<(String, Value)> for geng::prelude::toml::map::Map<String, Value>

impl Extend<char> for String

impl Extend<u8> for Bytes

impl Extend<u8> for bytes::bytes::BytesMut

impl Extend<u8> for BytesMut

1.28.0 · source§

impl Extend<()> for ()

impl Extend<Extensions> for Extensions

1.45.0 · source§

impl Extend<Box<str>> for String

1.4.0 · source§

impl Extend<String> for String

1.52.0 · source§

impl Extend<OsString> for OsString

impl Extend<Access> for Access

impl Extend<Access> for Access

impl Extend<AccessFlags> for AccessFlags

impl Extend<Anchor> for Anchor

impl Extend<Anchor> for Anchor

impl Extend<Api> for Api

impl Extend<AtFlags> for AtFlags

impl Extend<AtFlags> for AtFlags

impl Extend<AtFlags> for AtFlags

impl Extend<Bytes> for BytesMut

impl Extend<CapabilitiesSecureBits> for CapabilitiesSecureBits

impl Extend<Capability> for Capability

impl Extend<Capability> for Capability

impl Extend<Capability> for Capability

impl Extend<CapabilityFlags> for CapabilityFlags

impl Extend<Channels> for Channels

impl Extend<ConfigSurfaceTypes> for ConfigSurfaceTypes

impl Extend<ConstraintAdjustment> for ConstraintAdjustment

impl Extend<ContentHint> for ContentHint

impl Extend<ContentHint> for ContentHint

impl Extend<ContentHint> for ContentHint

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<DisplayFeatures> for DisplayFeatures

impl Extend<DndAction> for DndAction

impl Extend<DupFlags> for DupFlags

impl Extend<DupFlags> for DupFlags

impl Extend<EfdFlags> for EfdFlags

impl Extend<EfdFlags> for EfdFlags

impl Extend<EpollCreateFlags> for EpollCreateFlags

impl Extend<EpollCreateFlags> for EpollCreateFlags

impl Extend<EpollFlags> for EpollFlags

impl Extend<EpollFlags> for EpollFlags

impl Extend<EventFlags> for EventFlags

impl Extend<EventFlags> for EventFlags

impl Extend<EventMask> for EventMask

impl Extend<EventMask> for EventMask

impl Extend<EventfdFlags> for EventfdFlags

impl Extend<EventfdFlags> for EventfdFlags

impl Extend<FallocateFlags> for FallocateFlags

impl Extend<FallocateFlags> for FallocateFlags

impl Extend<FallocateFlags> for FallocateFlags

impl Extend<FdFlag> for FdFlag

impl Extend<FdFlags> for FdFlags

impl Extend<FdFlags> for FdFlags

impl Extend<Flags> for Flags

impl Extend<Flags> for Flags

impl Extend<Flags> for Flags

impl Extend<FloatingPointEmulationControl> for FloatingPointEmulationControl

impl Extend<FloatingPointExceptionMode> for FloatingPointExceptionMode

impl Extend<FsFlags> for FsFlags

impl Extend<FutexFlags> for FutexFlags

impl Extend<InputModes> for InputModes

impl Extend<Kind> for Kind

impl Extend<LocalModes> for LocalModes

impl Extend<MRemapFlags> for MRemapFlags

impl Extend<MapFlags> for MapFlags

impl Extend<MemFdCreateFlag> for MemFdCreateFlag

impl Extend<MembarrierQuery> for MembarrierQuery

impl Extend<MemfdFlags> for MemfdFlags

impl Extend<MemfdFlags> for MemfdFlags

impl Extend<MlockAllFlags> for MlockAllFlags

impl Extend<Mode> for Mode

impl Extend<Mode> for Mode

impl Extend<Mode> for Mode

impl Extend<Mode> for Mode

impl Extend<ModifiersState> for ModifiersState

impl Extend<MountFlags> for MountFlags

impl Extend<MountFlags> for MountFlags

impl Extend<MountPropagationFlags> for MountPropagationFlags

impl Extend<MountPropagationFlags> for MountPropagationFlags

impl Extend<MsFlags> for MsFlags

impl Extend<MsgFlags> for MsgFlags

impl Extend<OFlag> for OFlag

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<PollFlags> for PollFlags

impl Extend<PortCap> for PortCap

impl Extend<PortType> for PortType

impl Extend<ProtFlags> for ProtFlags

impl Extend<ReadWriteFlags> for ReadWriteFlags

impl Extend<ReadWriteFlags> for ReadWriteFlags

impl Extend<RecvFlags> for RecvFlags

impl Extend<Remove> for Remove

impl Extend<RenameFlags> for RenameFlags

impl Extend<RenameFlags> for RenameFlags

impl Extend<RenameFlags> for RenameFlags

impl Extend<Resize> for Resize

impl Extend<ResolveFlags> for ResolveFlags

impl Extend<ResolveFlags> for ResolveFlags

impl Extend<SFlag> for SFlag

impl Extend<SealFlag> for SealFlag

impl Extend<SealFlags> for SealFlags

impl Extend<SealFlags> for SealFlags

impl Extend<SendFlags> for SendFlags

impl Extend<ShmOFlags> for ShmOFlags

impl Extend<SockFlag> for SockFlag

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<TaggedAddressMode> for TaggedAddressMode

impl Extend<ThreadNameSpaceType> for ThreadNameSpaceType

impl Extend<TimerfdFlags> for TimerfdFlags

impl Extend<TimerfdTimerFlags> for TimerfdTimerFlags

impl Extend<TimestampingFlag> for TimestampingFlag

impl Extend<TrancheFlags> for TrancheFlags

impl Extend<Transformations> for Transformations

impl Extend<Transient> for Transient

impl Extend<UnalignedAccessControl> for UnalignedAccessControl

impl Extend<UnmountFlags> for UnmountFlags

impl Extend<UnmountFlags> for UnmountFlags

impl Extend<UnshareFlags> for UnshareFlags

impl Extend<WaitOptions> for WaitOptions

impl Extend<WaitidOptions> for WaitidOptions

impl Extend<WatchFlags> for WatchFlags

impl Extend<WatchFlags> for WatchFlags

impl Extend<WatchMask> for WatchMask

impl Extend<WatchMask> for WatchMask

impl Extend<WindowButtons> for WindowButtons

impl Extend<WindowManagerCapabilities> for WindowManagerCapabilities

impl Extend<WindowState> for WindowState

impl Extend<XattrFlags> for XattrFlags

impl Extend<XattrFlags> for XattrFlags

impl Extend<xkb_state_component> for xkb_state_component

1.2.0 · source§

impl<'a> Extend<&'a char> for String

impl<'a> Extend<&'a str> for String

impl<'a> Extend<&'a u8> for Bytes

impl<'a> Extend<&'a u8> for bytes::bytes::BytesMut

impl<'a> Extend<&'a u8> for BytesMut

1.52.0 · source§

impl<'a> Extend<&'a OsStr> for OsString

1.19.0 · source§

impl<'a> Extend<Cow<'a, str>> for String

1.52.0 · source§

impl<'a> Extend<Cow<'a, OsStr>> for OsString

1.2.0 · source§

impl<'a, K, V, A> Extend<(&'a K, &'a V)> for BTreeMap<K, V, A>
where K: Ord + Copy, V: Copy, A: Allocator + Clone,

1.4.0 · source§

impl<'a, K, V, S> Extend<(&'a K, &'a V)> for geng::prelude::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<(&'a K, &'a V)> for AHashMap<K, V, S>
where K: Eq + Hash + Copy + 'a, V: Copy + 'a, S: BuildHasher,

impl<'a, K, V, S, A> Extend<&'a (K, V)> for HashMap<K, V, S, A>
where K: Eq + Hash + Copy, V: Copy, S: BuildHasher, A: Allocator,

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>
where K: Eq + Hash + Copy, V: Copy, S: BuildHasher, A: Allocator,

Inserts all new key-values from the iterator and replaces values with existing keys with new values returned from the iterator.

1.2.0 · source§

impl<'a, T, A> Extend<&'a T> for BinaryHeap<T, A>
where T: 'a + Ord + Copy, A: Allocator,

1.2.0 · source§

impl<'a, T, A> Extend<&'a T> for BTreeSet<T, A>
where T: 'a + Ord + Copy, A: Allocator + Clone,

1.2.0 · source§

impl<'a, T, A> Extend<&'a T> for LinkedList<T, A>
where T: 'a + Copy, A: Allocator,

1.2.0 · source§

impl<'a, T, A> Extend<&'a T> for VecDeque<T, A>
where T: 'a + Copy, A: Allocator,

1.2.0 · source§

impl<'a, T, A> Extend<&'a T> for Vec<T, A>
where T: 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.

1.4.0 · source§

impl<'a, T, S> Extend<&'a T> for geng::prelude::HashSet<T, S>
where T: 'a + Eq + Hash + Copy, S: BuildHasher,

impl<'a, T, S> Extend<&'a T> for IndexSet<T, S>
where T: Hash + Eq + Copy + 'a, S: BuildHasher,

impl<'a, T, S> Extend<&'a T> for AHashSet<T, S>
where T: 'a + Eq + Hash + 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,

impl<'a, V> Extend<(usize, &'a V)> for VecMap<V>
where V: Copy,

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,

1.56.0 · source§

impl<A, B, ExtendA, ExtendB> Extend<(A, B)> for (ExtendA, ExtendB)
where ExtendA: Extend<A>, ExtendB: Extend<B>,

impl<Fut> Extend<Fut> for FuturesOrdered<Fut>
where Fut: Future,

impl<Fut> Extend<Fut> for FuturesUnordered<Fut>

impl<K, V> Extend<(K, V)> for InlineTable
where K: Into<Key>, V: Into<Value>,

impl<K, V> Extend<(K, V)> for Table
where K: Into<Key>, V: Into<Value>,

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 geng::prelude::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 IndexMap<K, V, S>
where K: Hash + Eq, S: BuildHasher,

impl<K, V, S> Extend<(K, V)> for AHashMap<K, V, S>
where K: Eq + Hash, S: BuildHasher,

impl<K, V, S, A> Extend<(K, V)> for HashMap<K, V, S, A>
where K: Eq + Hash, S: BuildHasher, A: Allocator,

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 std::path::PathBuf
where P: AsRef<Path>,

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 Collection<T>
where T: HasId,

impl<T, A> Extend<T> for BinaryHeap<T, A>
where T: Ord, A: Allocator,

impl<T, A> Extend<T> for BTreeSet<T, A>
where T: Ord, A: Allocator + Clone,

impl<T, A> Extend<T> for LinkedList<T, A>
where A: Allocator,

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 geng::prelude::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> Extend<T> for AHashSet<T, S>
where T: Eq + Hash, S: BuildHasher,

impl<T, S, A> Extend<T> for HashSet<T, S, A>
where T: Eq + Hash, S: BuildHasher, A: Allocator,

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.

impl<V> Extend<(usize, V)> for VecMap<V>

impl<V> Extend<V> for Array
where V: Into<Value>,