Trait Handler 

pub trait Handler<Req, Resp> {
    // Required methods
    fn name(&self) -> &'static str;
    fn run(&mut self, request: Req, world: &mut World) -> Result<Resp, String>;
    fn access(&self) -> Vec<Access>;
}

Trait-object interface for all handler types.

Parallel to System, but shaped for request/response invocation: the caller supplies a Req value and receives Result<Resp, String> back. SystemParams are injected from the ECS world just as they are in regular systems.

Required Methods

fn name(&self) -> &'static str

Human-readable handler name (for diagnostics and conflict messages).

fn run(&mut self, request: Req, world: &mut World) -> Result<Resp, String>

Run the handler with the given request against the world.

fn access(&self) -> Vec<Access>

Declare what world data this handler accesses.

Returns the union of all parameter accesses for parameterized handlers.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors