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use crate::{Generator, GeneratorResult, ValueResult};
#[derive(Clone)]
pub struct Copied<Src> {
source: Src,
}
impl<Src> Copied<Src> {
pub(crate) fn new(source: Src) -> Self {
Self { source }
}
}
impl<'a, Src, T> Generator for Copied<Src>
where
T: 'a + Copy,
Src: Generator<Output = &'a T>,
{
type Output = T;
#[inline]
fn run(&mut self, mut output: impl FnMut(Self::Output) -> ValueResult) -> GeneratorResult {
self.source.run(|&x| output(x))
}
#[inline]
fn try_advance(&mut self, n: core::num::NonZeroUsize) -> (usize, GeneratorResult) {
self.source.try_advance(n)
}
}
#[cfg(test)]
mod tests {
use crate::test::StoppingGen;
use crate::{GeneratorExt, GeneratorResult};
#[test]
fn spuriously_stopping() {
let data = [1, 2, 3];
for x in 0..data.len() {
let mut gen = StoppingGen::new(x as i32, &data).copied();
let mut output: Vec<i32> = Vec::new();
let result = gen.for_each(|x| output.push(x));
assert_eq!(result, GeneratorResult::Stopped);
let result = gen.for_each(|x| output.push(x));
assert_eq!(result, GeneratorResult::Complete);
assert_eq!(output, [1, 2, 3]);
}
}
}