Struct ondrop::OnDrop

pub struct OnDrop<F: FnOnce()>(_);

Calls the wrapped closure when dropped.

That's it.

Examples

Test that Box does in fact drop its contents:

let mut drops = 0;
let boxed = Box::new(OnDrop::new(|| {
    drops += 1;
}));

drop(boxed);

assert_eq!(drops, 1);

Methods

impl<F: FnOnce()> OnDrop<F>

pub fn new(f: F) -> Self

Creates a new OnDrop from a closure.

pub fn into_inner(self) -> F

Unwraps the closure without calling it.

Examples

let dropper = OnDrop::new(|| panic!());
dropper.into_inner(); // no panic

Trait Implementations

impl<F: Clone + FnOnce()> Clone for OnDrop<F>

fn clone(&self) -> OnDrop<F>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<F: Debug + FnOnce()> Debug for OnDrop<F>

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

Formats the value using the given formatter.

impl<F: Default + FnOnce()> Default for OnDrop<F>

fn default() -> OnDrop<F>

Returns the "default value" for a type.

impl<F: FnOnce()> Drop for OnDrop<F>

fn drop(&mut self)

Executes the destructor for this type.

impl<F: Eq + FnOnce()> Eq for OnDrop<F>

impl<F: Hash + FnOnce()> Hash for OnDrop<F>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl<F: Ord + FnOnce()> Ord for OnDrop<F>

fn cmp(&self, other: &OnDrop<F>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

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

Restrict a value to a certain interval.

impl<F: PartialEq + FnOnce()> PartialEq<OnDrop<F>> for OnDrop<F>

fn eq(&self, other: &OnDrop<F>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &OnDrop<F>) -> bool

This method tests for !=.

impl<F: PartialOrd + FnOnce()> PartialOrd<OnDrop<F>> for OnDrop<F>

fn partial_cmp(&self, other: &OnDrop<F>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &OnDrop<F>) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &OnDrop<F>) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &OnDrop<F>) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &OnDrop<F>) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<F: FnOnce()> StructuralEq for OnDrop<F>

impl<F: FnOnce()> StructuralPartialEq for OnDrop<F>