Trait SubstateAccess 

pub trait SubstateAccess<T> {
    // Required methods
    fn substate(&self) -> SubstateResult<&T>;
    fn substate_mut(&mut self) -> SubstateResult<&mut T>;
}

A trait for obtaining immutable and mutable references to a substate of type T.

Example

impl SubstateAccess<P2pState> for State {
   fn substate(&self) -> SubstateResult<&P2pState> {
       self.p2p
           .ready()
           .ok_or_else(|| "P2P state unavailable. P2P layer is not ready".to_owned())
   }

   fn substate_mut(&mut self) -> SubstateResult<&mut P2pState> {
       self.p2p
           .ready_mut()
           .ok_or_else(|| "P2P state unavailable. P2P layer is not ready".to_owned())
   }
 }

Required Methods

fn substate(&self) -> SubstateResult<&T>

Attempts to obtain an immutable reference to the substate.

In case of failure, an error String describing the reason is returned.

fn substate_mut(&mut self) -> SubstateResult<&mut T>

Attempts to obtain a mutable reference to the substate.

In case of failure, an error String describing the reason is returned.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors