Trait ReadOptional

pub trait ReadOptional: DefinedAt {
    type Value;

    // Required method
    fn try_read(&self) -> Option<Self::Value>;

    // Provided method
    fn read(&self) -> Self::Value { ... }
}

An alternative Read trait that works with Option<Readable> types.

Required Associated Types

type Value

The guard type that will be returned, which can be dereferenced to the value.

Required Methods

fn try_read(&self) -> Option<Self::Value>

Subscribes to the signal, and returns the guard, or None if the signal has already been disposed.

Provided Methods

fn read(&self) -> Self::Value

Subscribes to the signal, and returns the guard.

Panics

Panics if you try to access a signal that has been disposed.

Implementations on Foreign Types

impl<T> ReadOptional for Option<T>

where Option<T>: DefinedAt, T: Read,

type Value = Option<<T as Read>::Value>

fn try_read(&self) -> Option<<Option<T> as ReadOptional>::Value>

Implementors