shrev 0.5.0

Event handler, meant to be used with `specs`.
Documentation 
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extern crate shrev;

use shrev::{EventHandler, EventReadData};

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct TestEvent {
    data: u32,
}

fn main() {
    let mut event_handler = EventHandler::new();

    event_handler
        .drain_vec_write(&mut vec![TestEvent { data: 1 }, TestEvent { data: 2 }])
        .expect("");

    let mut reader_id = event_handler.register_reader();

    // Should be empty, because reader was created after the write
    match event_handler.read(&mut reader_id) {
        Ok(EventReadData::Data(data)) => assert_eq!(
            Vec::<TestEvent>::default(),
            data.cloned().collect::<Vec<_>>()
        ),
        _ => panic!(),
    }

    event_handler
        .drain_vec_write(&mut vec![TestEvent { data: 8 }, TestEvent { data: 9 }])
        .expect("");

    // Should have data, as a second write was done
    match event_handler.read(&mut reader_id) {
        Ok(EventReadData::Data(data)) => assert_eq!(
            vec![TestEvent { data: 8 }, TestEvent { data: 9 }],
            data.cloned().collect::<Vec<_>>()
        ),
        _ => panic!(),
    }
}