我试图用实现Link
的泛型创建一个SinglLink
特征和一个结构Link
,但是当我调用该结构的关联函数时,出现了错误。我应该使用像vec!
这样的宏吗?
mod Link {
use std::cell::RefCell;
use std::collections::VecDeque;
use std::fmt::Debug;
use std::rc::Rc;
trait Link {
type Node;
type Value;
fn new(data: &mut VecDeque<Self::Value>) -> Self;
}
#[derive(Debug)]
pub struct Node<T> {
pub value: T,pub next: RefCell<Option<Rc<Node<T>>>>,}
#[derive(Debug)]
pub struct SinglLink<T> {
pub header: RefCell<Option<Rc<Node<T>>>>,pub len: i32,}
impl<T: Copy> Link for SinglLink<T> {
type Node = Node<T>;
type Value = T;
fn new(data: &mut VecDeque<Self::Value>) -> Self {
SinglLink {
header: RefCell::new(None),len: 0,}
}
}
}
#[cfg(test)]
mod tests {
use super::Link::SinglLink;
use super::*;
use std::cell::RefCell;
use std::collections::VecDeque;
#[test]
fn it_works() {
let mut data: VecDeque<i32> = vec![1,2,3,4,5,6,7,8,9,10].into_iter().collect();
let single: SinglLink<i32> = SinglLink::new(&mut data);
}
}
错误消息:
error[E0599]: no function or associated item named `new` found for type `Link::SinglLink<_>` in the current scope
--> src/lib.rs:47:49
|
20 | pub struct SinglLink<T> {
| ----------------------- function or associated item `new` not found for this
...
47 | let single: SinglLink<i32> = SinglLink::new(&mut data);
| ^^^ function or associated item not found in `Link::SinglLink<_>`
|
= help: items from traits can only be used if the trait is implemented and in scope
= note: the following trait defines an item `new`,perhaps you need to implement it:
candidate #1: `Link::Link`