# Trait ethcore_util::standard::ops::Placer [−] [src]

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

Unstable (`placement_new_protocol`)

Interface to implementations of `in (PLACE) EXPR`.

`in (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 `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`)

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

## Required Methods

### `fn make_place(self) -> Self::Place`

Unstable (`placement_new_protocol`)

Creates a fresh place from `self`.

## Implementors

- `impl<'a, T> Placer<T> for FrontPlace<'a, T>`
- `impl<'a, T> Placer<T> for BackPlace<'a, T>`
- `impl<T> Placer<T> for ExchangeHeapSingleton`

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