Trait collections::std::ops::Boxed
[−]
[src]
pub trait Boxed { type Data; type Place: BoxPlace<Self::Data>; unsafe fn finalize(filled: Self::Place) -> Self; }
Unstable (
placement_new_protocol
#27779)Core trait for the box EXPR
form.
box EXPR
effectively desugars into:
let mut place = BoxPlace::make_place(); let raw_place = Place::pointer(&mut place); let value = EXPR; unsafe { ::std::ptr::write(raw_place, value); Boxed::finalize(place) }
The type of box EXPR
is supplied from its surrounding
context; in the above expansion, the result type T
is used
to determine which implementation of Boxed
to use, and that
<T as Boxed>
in turn dictates determines which
implementation of BoxPlace
to use, namely:
<<T as Boxed>::Place as BoxPlace>
.
Associated Types
type Data
Unstable (
placement_new_protocol
#27779)The kind of data that is stored in this kind of box.
type Place: BoxPlace<Self::Data>
Unstable (
placement_new_protocol
#27779)The place that will negotiate the storage of the data.
Required Methods
unsafe fn finalize(filled: Self::Place) -> Self
Unstable (
placement_new_protocol
#27779)Converts filled place into final owning value, shifting
deallocation/cleanup responsibilities (if any remain), over to
returned instance of Self
and forgetting filled
.