Trait WritableOptionExt

pub trait WritableOptionExt<T: 'static>: Writable<Target = Option<T>> {
    // Provided methods
    fn get_or_insert(&mut self, default: T) -> WritableRef<'_, Self, T> { ... }
    fn get_or_insert_with(
        &mut self,
        default: impl FnOnce() -> T,
    ) -> WritableRef<'_, Self, T> { ... }
    fn as_mut(&mut self) -> Option<WritableRef<'_, Self, T>> { ... }
}

An extension trait for Writable<Option<T>>` that provides some convenience methods.

Provided Methods

fn get_or_insert(&mut self, default: T) -> WritableRef<'_, Self, T>

Gets the value out of the Option, or inserts the given value if the Option is empty.

fn get_or_insert_with( &mut self, default: impl FnOnce() -> T, ) -> WritableRef<'_, Self, T>

Gets the value out of the Option, or inserts the value returned by the given function if the Option is empty.

fn as_mut(&mut self) -> Option<WritableRef<'_, Self, T>>

Attempts to write the inner value of the Option.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<T, W> WritableOptionExt<T> for W

where T: 'static, W: Writable<Target = Option<T>>,