# Struct collections::boxed::ExchangeHeapSingleton [−] [src]

    pub struct ExchangeHeapSingleton {
        // some fields omitted
    }

Unstable (`box_heap` #27779)

: may be renamed; uncertain about custom allocator design

This the singleton type used solely for `boxed::HEAP`.

## Trait Implementations

### `impl Clone for ExchangeHeapSingleton`

#### `fn clone(&self) -> ExchangeHeapSingleton`

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`
1.0.0

Performs copy-assignment from `source`. Read more

### `impl Copy for ExchangeHeapSingleton`

### `impl<T> Placer<T> for ExchangeHeapSingleton`

#### `type Place = IntermediateBox<T>`

Unstable (`placement_new_protocol` #27779)

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

#### `fn make_place(self) -> IntermediateBox<T>`

Unstable (`placement_new_protocol` #27779)

Creates a fresh place from `self`.

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