Struct DropGuard

Source

pub struct DropGuard<T, F>where
    F: FnOnce(T),
{ /* private fields */ }

Expand description

Runs F on T when the instance is dropped.

Equivalent of std::mem::DropGuard.

Implementations§

Source §

impl<T, F> DropGuard<T, F>
where F: FnOnce(T),

Source

pub const fn new(value: T, f: F) -> DropGuard<T, F>

Creates a new OnDrop instance.

Source

pub fn into_inner(guard: DropGuard<T, F>) -> T

Consumes the DropGuard, returning the wrapped value.

This will not execute the closure. This is implemented as an associated function to prevent any potential conflicts with any other methods called into_inner from the Deref and DerefMut impls.

It is typically preferred to call this function instead of mem::forget because it will return the stored value and drop variables captured by the closure instead of leaking their owned resources.

Trait Implementations§

Source §

impl<T, F> Deref for DropGuard<T, F>
where F: FnOnce(T),

Source §

type Target = T

The resulting type after dereferencing.

Source §

fn deref(&self) -> &<DropGuard<T, F> as Deref>::Target

Dereferences the value.

Source §

impl<T, F> DerefMut for DropGuard<T, F>
where F: FnOnce(T),

Source §

fn deref_mut(&mut self) -> &mut <DropGuard<T, F> as Deref>::Target

Mutably dereferences the value.

Source §

impl<T, F> Drop for DropGuard<T, F>
where F: FnOnce(T),

Source §

fn drop(&mut self)

Executes the destructor for this type. Read more

Auto Trait Implementations§

§

impl<T, F> Freeze for DropGuard<T, F>
where T: Freeze, F: Freeze,

§

impl<T, F> RefUnwindSafe for DropGuard<T, F>
where T: RefUnwindSafe, F: RefUnwindSafe,

§

impl<T, F> UnwindSafe for DropGuard<T, F>
where T: UnwindSafe, F: UnwindSafe,

Blanket Implementations§

Source §

impl<T> Any for T
where T: 'static + ?Sized,

Source §

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

Source §

impl<T> Borrow<T> for T
where T: ?Sized,

Source §

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

Source §

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source §

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

Source §

impl<T, R> CollectAndApply<T, R> for T

Source §

fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

Source §

type Output = R

Source §

impl<T> From<T> for T

Source §

fn from(t: T) -> T

Returns the argument unchanged.

Source §

impl<T> Instrument for T

Source §

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Source §

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Source §

impl<T, U> Into for T
where U: From<T>,

Source §

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Source §

impl<T> IntoEither for T

Source §

fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

Source §

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

Source §