state_machine_future 0.2.0

Easily create type-safe `Future`s from state machines — without the boilerplate.
Documentation 
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//! Test that the `AfterBlah` types implement `From<Successor>` for all
//! `Successor` typestates that come after the `Blah` typestate.

extern crate futures;
#[macro_use]
extern crate state_machine_future;

use futures::{Async, Poll};
use state_machine_future::RentToOwn;

#[derive(StateMachineFuture)]
pub enum Machine {
    /// Choose which next state to go into depending on what start value is
    /// given.
    #[state_machine_future(start)]
    #[state_machine_future(transitions(Ready, TransitionMacro))]
    Start,

    #[state_machine_future(transitions(Ready))]
    TransitionMacro,

    #[state_machine_future(ready)]
    Ready(usize),

    #[state_machine_future(error)]
    Error(usize),
}

impl PollMachine for Machine {
    fn poll_start<'a>(_: &'a mut RentToOwn<'a, Start>) -> Poll<AfterStart, usize> {
        Ok(Async::Ready(Ready(1).into()))
    }

    fn poll_transition_macro<'a>(
        _: &'a mut RentToOwn<'a, TransitionMacro>,
    ) -> Poll<AfterTransitionMacro, usize> {
        transition!(Ready(2))
    }
}