drone-stm32 0.8.3

Drone for STM32.
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use super::{Data, StackData};
use core::marker::PhantomData;
use core::mem::forget;
use fib::FiberState;
use sv::Switch;

/// A communication channel for [`FiberStack`](FiberStack).
pub struct Yielder<Sv, I, Y, R>
where
  Sv: Switch<StackData<I, Y, R>>,
  I: Send + 'static,
  Y: Send + 'static,
  R: Send + 'static,
{
  _sv: PhantomData<*const Sv>,
  _input: PhantomData<*const I>,
  _yield: PhantomData<*const Y>,
  _return: PhantomData<*const R>,
}

#[cfg_attr(feature = "cargo-clippy", allow(new_without_default_derive))]
impl<Sv, I, Y, R> Yielder<Sv, I, Y, R>
where
  Sv: Switch<StackData<I, Y, R>>,
  I: Send + 'static,
  Y: Send + 'static,
  R: Send + 'static,
{
  /// Creates a new `Yielder`. Normally one should use the yielder provided to
  /// fiber as argument.
  ///
  /// # Safety
  ///
  /// `I` and `O` types must match the enclosing fiber.
  #[inline(always)]
  pub unsafe fn new() -> Self {
    Self {
      _sv: PhantomData,
      _input: PhantomData,
      _yield: PhantomData,
      _return: PhantomData,
    }
  }

  /// Yields from the enclosing stackful fiber.
  #[cfg_attr(feature = "cargo-clippy", allow(trivially_copy_pass_by_ref))]
  pub fn stack_yield(&self, output: Y) -> I {
    unsafe {
      let output = FiberState::Yielded(output);
      let mut data = Data { output };
      let mut data_ptr = &mut data as *mut _;
      Sv::switch_back(&mut data_ptr);
      forget(data);
      data_ptr.read().input
    }
  }
}

impl<Sv, I, Y, R> Clone for Yielder<Sv, I, Y, R>
where
  Sv: Switch<StackData<I, Y, R>>,
  I: Send + 'static,
  Y: Send + 'static,
  R: Send + 'static,
{
  fn clone(&self) -> Self {
    unsafe { Self::new() }
  }
}

impl<Sv, I, Y, R> Copy for Yielder<Sv, I, Y, R>
where
  Sv: Switch<StackData<I, Y, R>>,
  I: Send + 'static,
  Y: Send + 'static,
  R: Send + 'static,
{}