Struct dangerous_option::DangerousOption

pub struct DangerousOption<T, H: ExceptionHandler = DefaultExceptionHandler>(_, _);

Represents a value that might be uninitialized, but most probably isn't. It provides convenient access to the value via Deref while checking whether the value is actually initialized.

When deref of initialized value is attempted, the ExceptionHandler is called. This will lead to aborting of the task.

Methods

impl<T, H: ExceptionHandler> DangerousOption<T, H>

fn new(val: T) -> Self

Creates valid value.

fn new_uninitialized() -> Self

Creates uninitialized value.

fn take_unchecked(this: &mut Self) -> T

Takes out the value, failing if it's not there. After call to this function, the value is uninitialized.

fn take_checked(this: &mut Self) -> Option<T>

Tries to take out the value. After call to this function, the value is uninitialized.

fn try(this: &Self) -> Option<&T>

Non-panicking version of deref, which returns None, if value is uninitiaized.

fn try_mut(this: &mut Self) -> Option<&mut T>

Non-panicking version of deref_mut, which returns None, if value is uninitiaized.

fn put(this: &mut Self, val: T) -> Option<T>

Puts the new value in place of old, optionally returning old value.

Trait Implementations

impl<T: Debug, H: Debug + ExceptionHandler> Debug for DangerousOption<T, H>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<T, H: ExceptionHandler> Deref for DangerousOption<T, H>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T, H: ExceptionHandler> DerefMut for DangerousOption<T, H>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<T> Clone for DangerousOption<T> where
    T: Clone, 

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.