Enum lazy_mut::LazyMut

pub enum LazyMut<T> {
    Init(fn() -> T),
    Value(T),
}

A mutable lazy value with either an initializer or a value

See the module-level documentation for more information on usage.

Variants

Init(fn() -> T)

An initializer that will be run to obtain the first value

Value(T)

The value from the initializer

Methods

impl<T> LazyMut<T>

pub fn unwrap(self) -> T

Returns the wrapped value, initializing if needed

pub fn init(&mut self) -> &mut LazyMut<T>

Initializes the wrapped value if it is uninitialized

pub fn init_once(&mut self) -> &mut LazyMut<T>

Initializes the wrapped value, panicking if it was already initialized

pub fn get(this: &LazyMut<T>) -> Option<&T>

Tries to get a reference to the value, returns None if the value is uninitialized

Uses associated function syntax (LazyMut::get(&VAL))

pub fn get_mut(this: &mut LazyMut<T>) -> Option<&mut T>

Tries to get a mutable reference the value, returns None if the value is uninitialized

Uses associated function syntax (LazyMut::get_mut(&mut VAL))

pub fn is_initialized(&self) -> bool

Returns true if the wrapped value has been initialized

Trait Implementations

impl<T: Clone> Clone for LazyMut<T>

fn clone(&self) -> LazyMut<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for LazyMut<T>

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

Formats the value using the given formatter.

impl<T> Deref for LazyMut<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for LazyMut<T>

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

Mutably dereferences the value.

impl<T> Display for LazyMut<T> where
    T: Display, 

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

Formats the value using the given formatter.