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extern crate coroutine;
use std::marker::PhantomData;
use coroutine::asymmetric::{Coroutine, Handle};
pub use coroutine::Error;
#[derive(Debug)]
pub struct Resumer<R, Y> {
handle: Handle,
_resume_marker: PhantomData<R>,
_yield_marker: PhantomData<Y>,
}
impl<R, Y> Resumer<R, Y> {
fn new(handle: Handle) -> Self {
Resumer {
handle: handle,
_resume_marker: PhantomData,
_yield_marker: PhantomData,
}
}
pub fn resume_with(&mut self, r: R) -> Result<Y, Error> {
let boxed = Box::new(r);
let pointer = self.handle.resume(Box::into_raw(boxed) as usize)?;
let data = unsafe { Box::from_raw(pointer as *mut Y) };
Ok(*data)
}
}
#[derive(Debug)]
pub struct Yielder<'a, R, Y> {
coroutine: &'a mut Coroutine,
_resume_marker: PhantomData<R>,
_yield_marker: PhantomData<Y>,
}
impl<'a, R, Y> Yielder<'a, R, Y> {
fn new(coroutine: &'a mut Coroutine) -> Self {
Yielder {
coroutine: coroutine,
_resume_marker: PhantomData,
_yield_marker: PhantomData,
}
}
pub fn yield_with(&mut self, y: Y) -> R {
let boxed = Box::new(y);
let pointer = self.coroutine.yield_with(Box::into_raw(boxed) as usize);
let data = unsafe { Box::from_raw(pointer as *mut R) };
*data
}
}
pub fn spawn<F, R, Y>(f: F) -> Resumer<R, Y>
where F: FnOnce(Yielder<R, Y>, R) -> Y + 'static {
let handle = Coroutine::spawn(|coroutine, pointer| {
let data = unsafe { Box::from_raw(pointer as *mut R) };
let result = f(Yielder::new(coroutine), *data);
let boxed = Box::new(result);
Box::into_raw(boxed) as usize
});
Resumer::new(handle)
}
#[cfg(test)]
mod tests {
use super::*;
#[derive(Debug,PartialEq)]
enum Request {
Init,
Chars(&'static str),
}
#[derive(Debug,PartialEq)]
enum Response {
Ready,
Integer(u64),
Float(f64),
Done,
}
#[test]
fn test_coroutines() {
let mut resumer = spawn(|mut yielder, init| {
assert_eq!(init, Request::Init);
assert_eq!(yielder.yield_with(Response::Ready), Request::Chars("integer"));
assert_eq!(yielder.yield_with(Response::Integer(123)), Request::Chars("float"));
assert_eq!(yielder.yield_with(Response::Float(1.23)), Request::Chars("done"));
Response::Done
});
assert_eq!(resumer.resume_with(Request::Init).unwrap(), Response::Ready);
assert_eq!(resumer.resume_with(Request::Chars("integer")).unwrap(), Response::Integer(123));
assert_eq!(resumer.resume_with(Request::Chars("float")).unwrap(), Response::Float(1.23));
assert_eq!(resumer.resume_with(Request::Chars("done")).unwrap(), Response::Done);
}
#[test]
fn test_panics() {
let mut resumer = spawn(|_, _| {
panic!("Oh no!");
});
assert!(resumer.resume_with(Request::Init).is_err());
}
}