# Constant alloc::heap::EMPTY [−] [src]

    pub const EMPTY: *mut () = 1 as *mut ()

Deprecated since 1.19

: Use Unique/Shared::empty() instead

🔬 This is a nightly-only experimental API. (`heap_api` #27700)

An arbitrary non-null address to represent zero-size allocations.

This preserves the non-null invariant for types like `Box<T>`. The address may overlap with non-zero-size memory allocations.

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
↑
  Move up in search results
↓
  Move down in search results
↹
  Switch tab
⏎
  Go to active search result
+ / -
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)