Struct r3_core::closure::ClosureEnv

#[repr(transparent)]
pub struct ClosureEnv(_);

The environment parameter type for Closure. It’s ABI-compatible with *mut () but might not be fully initialized.

It’s something that would usually be just intptr_t or void * in C code. It’s designed to have the following properties:

• It’s ABI-compatible with a C pointer, making it possible to pass the components of a Closure to kernel implementations written in inline assembly or other languages without needing to wrap it with another trampoline.

• Unlike dyn FnOnce(), it doesn’t waste memory for vtable, most entries of which will never be used for static closures.

• Constructing it from a pointer doens’t require a pointer-to-integer cast, which is disallowed in a constant context.

Currently it must be filled with initialized bytes because of compiler restrictions. This may change in the future.

Trait Implementations

impl Clone for ClosureEnv

fn clone(&self) -> ClosureEnv

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ClosureEnv

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ClosureEnv

const fn default() -> Self

Returns the “default value” for a type.

impl Init for ClosureEnv

const INIT: Self = _

The default value.

impl Copy for ClosureEnv