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#![feature(generator_trait, never_type)]
#![no_std]
#[cfg(feature = "alloc")]
extern crate alloc;
mod iter;
mod map;
#[cfg(feature = "alloc")]
use alloc::boxed::Box;
use core::{
ops::{Generator, GeneratorState},
pin::Pin,
};
pub use iter::{FusedGenIterator, RawGenIterator, SimpleGenIterator};
pub use map::{MapResume, MapReturn, MapYield};
#[cfg(feature = "alloc")]
pub type BoxGenerator<Resume, Yield, Return> =
Pin<Box<dyn Generator<Resume, Yield = Yield, Return = Return>>>;
pub trait GeneratorExt<R>: core::ops::Generator<R> {
fn map_yield<F, T>(self, func: F) -> MapYield<Self, F>
where
F: FnMut(Self::Yield) -> T,
Self: Sized,
{
MapYield { gen: self, func }
}
fn map_return<F, T>(self, func: F) -> MapReturn<Self, F>
where
F: FnMut(Self::Return) -> T,
Self: Sized,
{
MapReturn { gen: self, func }
}
fn map_resume<F, T>(self, func: F) -> MapResume<Self, F>
where
F: FnMut(T) -> R,
Self: Sized,
{
MapResume { gen: self, func }
}
fn resume_unpin(&mut self, arg: R) -> GeneratorState<Self::Yield, Self::Return>
where
Self: Unpin,
{
Pin::new(self).resume(arg)
}
fn by_ref(&mut self) -> &mut Self {
self
}
#[cfg(feature = "alloc")]
fn boxed(self) -> Pin<Box<Self>>
where
Self: Sized,
{
Box::pin(self)
}
fn iterate_over_yields(self) -> SimpleGenIterator<Self>
where
Self: Sized + Unpin,
Self::Return: iter::SupportedReturnValue,
{
SimpleGenIterator(self)
}
fn into_raw_iterator(self) -> RawGenIterator<Self>
where
Self: Generator<()> + Sized + Unpin,
{
RawGenIterator { gen: self }
}
fn into_fused_iterator(self) -> FusedGenIterator<Self>
where
Self: Generator<()> + Sized + Unpin,
{
FusedGenIterator::new(self)
}
}
impl<R, G: Generator<R>> GeneratorExt<R> for G {}