Struct Defer 

pub struct Defer<F: FnOnce()> { /* private fields */ }

Execute a closure on drop.

Examples

This program prints 01:

fn foo() {
    let guard = Defer::new(|| print!("1"));
    print!("0");
} // <- guard dropped here

Implementations

impl<F: FnOnce()> Defer<F>

pub const fn new(f: F) -> Self

Creates a new guard that will executed the provided closure when it is dropped.

pub fn defuse(self)

“Defuses” this scope guard, preventing the closure from running.

For more information, see the crate docs.

Notes

This will drop the closure (and all of its captures).

Examples

let guard = Defer::new(|| unreachable!("never executed"));
guard.defuse();

Trait Implementations

impl<F: FnOnce()> Debug for Defer<F>

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

Formats the value using the given formatter.

impl<F: FnOnce()> Drop for Defer<F>

fn drop(&mut self)

Executes the destructor for this type.