Trait nom::lib::std::prelude::v1::rust_2015::Extend1.0.0[−][src]

pub trait Extend<A> {
    pub fn extend<T>(&mut self, iter: T)
    where
        T: IntoIterator<Item = A>;

    pub fn extend_one(&mut self, item: A) { ... }
    pub fn extend_reserve(&mut self, additional: usize) { ... }
}

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

`pub fn extend<T>(&mut self, iter: T) where T: IntoIterator<Item = A>,` [src][−]

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

`pub fn extend_one(&mut self, item: A)`[src][−]

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

Extends a collection with exactly one element.

`pub fn extend_reserve(&mut self, additional: usize)`[src][−]

🔬 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.

Implementors

`impl Extend<()> for ()`1.28.0[src][+]

[+] Show hidden undocumented items

`pub fn extend<T>(&mut self, iter: T) where T: IntoIterator<Item = ()>,` [src]

`pub fn extend_one(&mut self, _item: ())`[src]

`impl Extend<Sides> for Sides`

`impl Extend<ColorMask> for ColorMask`

`impl Extend<Mirror> for Mirror`

`impl<L, R, A> Extend<A> for Either<L, R> where L: Extend<A>, R: Extend<A>,`

`impl Extend<Access> for Access`

`impl Extend<Bind> for Bind`

`impl Extend<Usage> for Usage`

`impl Extend<DepthStencilFlags> for DepthStencilFlags`

`impl Extend<ModifierKey> for ModifierKey`

`impl Extend<AtFlags> for AtFlags`

`impl Extend<OFlag> for OFlag`

`impl Extend<SealFlag> for SealFlag`

`impl Extend<FdFlag> for FdFlag`

`impl Extend<SpliceFFlags> for SpliceFFlags`

`impl Extend<FallocateFlags> for FallocateFlags`

`impl Extend<ModuleInitFlags> for ModuleInitFlags`

`impl Extend<DeleteModuleFlags> for DeleteModuleFlags`

`impl Extend<MsFlags> for MsFlags`

`impl Extend<MntFlags> for MntFlags`

`impl Extend<MQ_OFlag> for MQ_OFlag`

`impl Extend<FdFlag> for FdFlag`

`impl Extend<InterfaceFlags> for InterfaceFlags`

`impl Extend<PollFlags> for PollFlags`

`impl Extend<CloneFlags> for CloneFlags`

`impl Extend<EpollFlags> for EpollFlags`

`impl Extend<EpollCreateFlags> for EpollCreateFlags`

`impl Extend<EfdFlags> for EfdFlags`

`impl Extend<MemFdCreateFlag> for MemFdCreateFlag`

`impl Extend<ProtFlags> for ProtFlags`

`impl Extend<MapFlags> for MapFlags`

`impl Extend<MRemapFlags> for MRemapFlags`

`impl Extend<MsFlags> for MsFlags`

`impl Extend<MlockAllFlags> for MlockAllFlags`

`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<SockFlag> for SockFlag`

`impl Extend<MsgFlags> for MsgFlags`

`impl Extend<SFlag> for SFlag`

`impl Extend<Mode> for Mode`

`impl Extend<FsFlags> for FsFlags`

`impl Extend<InputFlags> for InputFlags`

`impl Extend<OutputFlags> for OutputFlags`

`impl Extend<ControlFlags> for ControlFlags`

`impl Extend<LocalFlags> for LocalFlags`

`impl Extend<WaitPidFlag> for WaitPidFlag`

`impl Extend<AddWatchFlags> for AddWatchFlags`

`impl Extend<InitFlags> for InitFlags`

`impl Extend<TimerFlags> for TimerFlags`

`impl Extend<TimerSetTimeFlags> for TimerSetTimeFlags`

`impl Extend<AccessFlags> for AccessFlags`

`impl Extend<Transformations> for Transformations`

`impl Extend<TokenTree> for TokenStream`

`impl Extend<TokenStream> for TokenStream`

`impl<A: Array> Extend<<A as Array>::Item> for SmallVec<A>`

`impl<T, P> Extend<T> for Punctuated<T, P> where P: Default,`

`impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P>`

`impl Extend<Error> for Error`

`impl Extend<DndAction> for DndAction`

`impl Extend<Resize> for Resize`

`impl Extend<Transient> for Transient`

`impl Extend<Capability> for Capability`

`impl Extend<Mode> for Mode`

`impl Extend<ContentHint> for ContentHint`

`impl Extend<Anchor> for Anchor`

`impl Extend<Gravity> for Gravity`

`impl Extend<ConstraintAdjustment> for ConstraintAdjustment`

`impl Extend<Anchor> for Anchor`

`impl Extend<Flags> for Flags`

`impl Extend<Kind> for Kind`

`impl Extend<ConstraintAdjustment> for ConstraintAdjustment`

`impl Extend<ModifiersState> for ModifiersState`

`impl<'a> Extend<(&'a str, &'a str)> for Namespace`

`impl<'a> Extend<(&'a str, &'a str)> for NamespaceStack`

`impl<'a, 'b> Extend<(&'b str, &'b str)> for CheckedTarget<'a>`