Trait collections::std::ops::Placer [−] [src]

pub trait Placer<Data> where Data: ?Sized {
    type Place: InPlace<Data>;
    fn make_place(self) -> Self::Place;
}
Unstable (placement_new_protocol #27779)

Interface to implementations of in (PLACE) EXPR.

in (PLACE) EXPR effectively desugars into:

fn main() { 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) } }
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 in (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>

Unstable (placement_new_protocol #27779)

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

Required Methods

fn make_place(self) -> Self::Place

Unstable (placement_new_protocol #27779)

Creates a fresh place from self.

Implementors