Struct Boundary 

pub(crate) struct Boundary {
    id: u64,
    outer: u64,
}

A miniextendr boundary that resumes R exits (RUnwind): the innermost on its thread from enter until it is dropped or leaves.

An exit belongs to the boundary that was innermost when its evaluation started, and only that boundary may resume it. Its jump target is an R context on the C stack, alive only while that boundary’s call is: an exit caught with catch_unwind, kept, and resumed after the call returned would jump into a frame that no longer exists. resume_if_r_unwind refuses it.

Fields

id: u64

outer: u64

Implementations

impl Boundary

pub(crate) fn enter() -> Self

Become the innermost boundary on this thread.

pub(crate) fn leave(&self)

Make the enclosing boundary the innermost again. Call it before leaving by an R jump, which skips Drop.

Trait Implementations

impl Drop for Boundary

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes