From 02481656966b0a8dfc95cf3c22bcc049660ff7d4 Mon Sep 17 00:00:00 2001
From: Federico Igne <git@federicoigne.com>
Date: Sat, 26 Dec 2020 17:48:38 +0000
Subject: Move Rust exercises in a subdirectory

---
 beer-song/src/intersperse.rs | 52 --------------------------------------------
 1 file changed, 52 deletions(-)
 delete mode 100644 beer-song/src/intersperse.rs

(limited to 'beer-song/src/intersperse.rs')

diff --git a/beer-song/src/intersperse.rs b/beer-song/src/intersperse.rs
deleted file mode 100644
index 51580e6..0000000
--- a/beer-song/src/intersperse.rs
+++ /dev/null
@@ -1,52 +0,0 @@
-use std::rc::Rc;
-
-/// An iterator that allows to insert a given element `elem` every `interval` elements of the input
-/// iterator.
-///
-/// The interleaved element is wrapped in a `Rc` smart pointer to avoid hard copies.
-pub struct Intersperse<I: Iterator> {
-    inner: std::iter::Peekable<I>, // required to have `peek(..)`
-    elem: Rc<I::Item>,
-    interval: u32,
-    intersperse: u32,
-}
-
-impl<I: Iterator> Intersperse<I> {
-    pub fn new(inner: I, elem: I::Item, interval: u32) -> Intersperse<I> {
-        Intersperse {
-            inner: inner.peekable(),
-            elem: Rc::new(elem),
-            interval: interval + 1, // `+ 1` needed to align semantics and implementation
-            intersperse: 0,
-        }
-    }
-}
-
-impl<I: Iterator> Iterator for Intersperse<I> {
-    type Item = Rc<I::Item>;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        // Counter rotation
-        self.intersperse = (self.intersperse + 1) % self.interval;
-        // Insert a copy of the element only when counter goes to 0 and we haven't reached the end
-        // of the inner iterator.
-        if self.intersperse == 0 && self.inner.peek().is_some() {
-            Some(Rc::clone(&self.elem))
-        } else {
-            self.inner.next()
-                .map(|x| Rc::new(x)) // Go from Option<I::Item> to Option<Rc<I::Item>>
-        }
-    }
-}
-
-/// Extend `Iterator`s with `intersperse` function.
-pub trait IntersperseIterator: Iterator {
-    fn intersperse(self, elem: Self::Item, interval: u32) -> Intersperse<Self>
-    where
-        Self: Sized,
-    {
-        Intersperse::new(self, elem, interval)
-    }
-}
-
-impl<I: Iterator> IntersperseIterator for I {}
-- 
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