added LICENSE and cleaned source folder

src/linked_list.rs

@@ -1,153 +0,0 @@
-use std::mem;
-use std::ptr;
-
-pub struct List<T> {
-    list_head: Option<Box<Node<T>>>,
-    list_tail: Rawlink<Node<T>>,
-}
-
-struct Rawlink<T> { p: *mut T }
-
-impl<T> Copy for Rawlink<T> {}
-
-impl<T> Clone for Rawlink<T> {
-    fn clone(&self) -> Self { Rawlink { p: self.p } }
-}
-
-pub struct Node<T> {
-    next: Option<Box<Node<T>>>,
-    prev: Rawlink<Node<T>>,
-    value: T,
-}
-
-impl<T> List<T> {
-    pub fn is_empty(&self) -> bool {
-        self.list_head.is_none()
-    }
-
-    pub fn len(&self) -> usize {
-        let mut node = &self.list_head;
-        let mut i = 0;
-        loop {
-            match *node {
-                Some(ref n) => {
-                    i+=1;
-                    node=&n.next;
-                }
-                None => {
-                    return i;
-                }
-            }
-        }
-    }
-    
-    /// Create an empty DList
-    pub fn new() -> List<T> {
-        List{list_head: None, list_tail: Rawlink::none()}
-    }
-
-    pub fn push_front(&mut self, elt: T) {
-        self.push_front_node(Box::new(Node::new(elt)))
-    }
-
-    pub fn push_front_node(&mut self, mut new_head: Box<Node<T>>) {
-        match self.list_head {
-            None => {
-                self.list_tail = Rawlink::some(&mut new_head);
-                new_head.prev = Rawlink::none();
-                self.list_head = Some(new_head);
-            }
-            Some(ref mut head) => {
-                new_head.prev = Rawlink::none();
-                head.prev = Rawlink::some(&mut new_head);
-                mem::swap(head, &mut new_head);
-                head.next = Some(new_head);
-            }
-        }
-    }
-
-    /// Provide a forward iterator
-    #[inline]
-    pub fn iter<'a>(&'a self) -> ListIterator<'a, T> {
-        ListIterator{nelem: self.len(), head: &self.list_head, tail: self.list_tail}
-    }
-}
-
-impl<T> Node<T> {
-    fn new(v: T) -> Node<T> {
-        Node{value: v, next: None, prev: Rawlink::none()}
-    }
-}
-
-/// Rawlink is a type like Option<T> but for holding a raw pointer
-impl<T> Rawlink<T> {
-    /// Like Option::None for Rawlink
-    fn none() -> Rawlink<T> {
-        Rawlink{p: ptr::null_mut()}
-    }
-
-    /// Like Option::Some for Rawlink
-    fn some(n: &mut T) -> Rawlink<T> {
-        Rawlink{p: n as *mut T}
-    }
-
-    /// Convert the `Rawlink` into an Option value
-    fn resolve_immut<'a>(&self) -> Option<&'a T> {
-        unsafe { self.p.as_ref() }
-    }
-
-    /// Convert the `Rawlink` into an Option value
-    fn resolve<'a>(&mut self) -> Option<&'a mut T> {
-        unsafe { self.p.as_mut() }
-    }
-
-    /// Return the `Rawlink` and replace with `Rawlink::none()`
-    fn take(&mut self) -> Rawlink<T> {
-        mem::replace(self, Rawlink::none())
-    }
-}
-
-pub struct ListIterator<'a, T: 'a> {
-    head: &'a Option<Box<Node<T>>>,
-    tail: Rawlink<Node<T>>,
-    nelem: usize,
-}
-
-impl<'a, A> Iterator for ListIterator<'a, A> {
-    type Item = &'a A;
-    
-    #[inline]
-    fn next(&mut self) -> Option<&'a A> {
-        if self.nelem == 0 {
-            return None;
-        }
-        self.head.as_ref().map(|head| {
-            self.nelem -= 1;
-            self.head = &head.next;
-            &head.value
-        })
-    }
-
-    #[inline]
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (self.nelem, Some(self.nelem))
-    }
-}
-
-impl<'a, A> DoubleEndedIterator for ListIterator<'a, A> {
-    #[inline]
-    fn next_back(&mut self) -> Option<&'a A> {
-        if self.nelem == 0 {
-            return None;
-        }
-        let tmp = self.tail.resolve_immut();
-        tmp.as_ref().map(|prev| {
-            self.nelem -= 1;
-            self.tail = prev.prev;
-            &prev.value
-        })
-    }
-}
-
-fn main() {
-}

src/test.rs

@@ -1,55 +0,0 @@
-
-
-use std::collections::HashMap;
-
-// This struct has one lifetime parameter, 'src. The name is only used within the struct's definition.
-#[derive(Debug)]
-struct Config<'src> {
-    hostname: &'src str,
-    username: &'src str,
-}
-
-// This function also has a lifetime parameter, 'cfg. 'cfg is attached to the "config" parameter, which
-// establishes that the data in "config" lives at least as long as the 'cfg lifetime.
-// The returned struct also uses 'cfg for its lifetime, so it can live at most as long as 'cfg.
-fn parse_config<'cfg>(config: &'cfg str) -> Config<'cfg> {
-    let key_values: HashMap<_, _> = config
-        .lines()
-        .filter(|line| !line.starts_with('#'))
-        .filter_map(|line| line.split_once('='))
-        .map(|(key, value)| (key.trim(), value.trim()))
-        .collect();
-    Config {
-        hostname: key_values["hostname"],
-        username: key_values["username"],
-    }
-}
-
-// fn main() {
-//     let config = parse_config(
-//         r#"hostname = foobar
-// username=barfoo"#,
-//     );
-//     println!("Parsed config: {:#?}", config);
-// }
-
-
-struct Foo {}
-
-fn foo<T>(v : &[T]) {
-    for el in v.into_iter() {
-
-    }
-}
-
-// fn foo2(v : &mut Vec<Vec<isize>>) {
-//     let first = &v[0];
-//     let second = &mut v[1];
-
-//     second[0] = first[1] + second[2];
-// }
-fn main() { 
-    let s = String::from("🤑😂🤩🤬");
-    let c= s.chars().nth(1).unwrap(); 
-    println!("{}", c);
-}