Trait MutableHelper 

pub trait MutableHelper {
    type Value;

    // Required methods
    fn with_mut<R>(&self, callback: impl FnOnce(&mut Self::Value) -> R) -> R;
    fn with_ref<R>(&self, callback: impl FnOnce(&Self::Value) -> R) -> R;
}

The single entry point to a Mutable, for both the single-threaded and the multi-threaded backend.

The callback is handed a plain reference rather than the backend’s guard, which is what makes the lock impossible to hold longer than the callback: the guard is a temporary inside with_mut / with_ref and is released before either returns. Everything the callback produces therefore lives — and is dropped — outside the lock.

See the module documentation for the rules a callback has to follow.

Required Associated Types

type Value

Required Methods

fn with_mut<R>(&self, callback: impl FnOnce(&mut Self::Value) -> R) -> R

fn with_ref<R>(&self, callback: impl FnOnce(&Self::Value) -> R) -> R

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<T> MutableHelper for Mutex<T>

type Value = T

fn with_mut<R>(&self, callback: impl FnOnce(&mut T) -> R) -> R

fn with_ref<R>(&self, callback: impl FnOnce(&T) -> R) -> R

Implementors