Trait std::ops::Placer

pub trait Placer<Data> where
    Data: ?Sized, {
    type Place: InPlace<Data>;
    fn make_place(self) -> Self::Place;
}

🔬 This is a nightly-only experimental API. (placement_new_protocol #27779)

Interface to implementations of PLACE <- EXPR.

PLACE <- EXPR effectively desugars into:

let p = PLACE;
let mut place = Placer::make_place(p);
let raw_place = Place::pointer(&mut place);
let value = EXPR;
unsafe {
    std::ptr::write(raw_place, value);
    InPlace::finalize(place)
}

The type of PLACE <- EXPR is derived from the type of PLACE; if the type of PLACE is P, then the final type of the whole expression is P::Place::Owner (see the InPlace and Boxed traits).

Values for types implementing this trait usually are transient intermediate values (e.g. the return value of Vec::emplace_back) or Copy, since the make_place method takes self by value.

Associated Types

type Place: InPlace<Data>

🔬 This is a nightly-only experimental API. (placement_new_protocol #27779)

Place is the intermediate agent guarding the uninitialized state for Data.

Required Methods

fn make_place(self) -> Self::Place

🔬 This is a nightly-only experimental API. (placement_new_protocol #27779)

Creates a fresh place from self.

Implementors

• impl<'a, T> Placer<T> for std::vec::PlaceBack<'a, T> type Place = PlaceBack<'a, T>;

• impl<'a, T> Placer<T> for std::collections::vec_deque::PlaceBack<'a, T> type Place = PlaceBack<'a, T>;

• impl<T> Placer<T> for ExchangeHeapSingleton type Place = IntermediateBox<T>;

• impl<'a, T> Placer<T> for &'a mut BinaryHeap<T> where     T: 'a + Clone + Ord,  type Place = BinaryHeapPlace<'a, T>;

• impl<'a, T> Placer<T> for FrontPlace<'a, T> type Place = FrontPlace<'a, T>;

• impl<'a, T> Placer<T> for BackPlace<'a, T> type Place = BackPlace<'a, T>;

• impl<'a, T> Placer<T> for PlaceFront<'a, T> type Place = PlaceFront<'a, T>;

• impl<'a, K, V> Placer<V> for Entry<'a, K, V> type Place = EntryPlace<'a, K, V>;