Trait Observable 

pub trait Observable: Output {
    // Required method
    fn snapshot(&mut self) -> u64;
}

Available on crate feature testing only.

A backend that can report a digest of what changed since the last call.

See the module docs for why “since the last call”, not the whole history or the whole current state, is the contract every implementation has to meet.

Required Methods

fn snapshot(&mut self) -> u64

A digest of what changed since the previous call (or since construction, for the first call).

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors