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README.md |
README.md
box_recursion
Instructions
Using the given code, create the following associated functions:
new
: which will initialize theWorkEnvironment
withgrade
set toNone
.add_worker
: which receives two strings, one being the role and the other the name of the worker. It will add the worker at the start of the list.remove_worker
: which removes the last worker that was placed in theWorkEnvironment
, this function returns anOption
with the name of the worker.last_worker
: which returns anOption
with a tuple containing the name and role of the last added worker.
You must also create a type named Link
. This will be the connection between the WorkEnvironment
and Worker
structures. This will be a recursion type, and it must point to None
if there is no Worker
to point to.
Expected Functions and structures
#[derive(Debug)]
pub struct WorkEnvironment {
pub grade: Link,
}
pub type Link =
#[derive(Debug)]
pub struct Worker {
pub role: String,
pub name: String,
pub next: Link,
}
impl WorkEnvironment {
pub fn new() -> WorkEnvironment {}
pub fn add_worker(&mut self, role: String, name: String) {}
pub fn remove_worker(&mut self) -> Option<String> {}
pub fn last_worker(&self) -> Option<(String, String)> {}
}
Usage
Here is a program to test your function,
use box_recursion::*;
fn main() {
let mut list = WorkEnvironment::new();
list.add_worker(String::from("CEO"), String::from("Marie"));
list.add_worker(String::from("Manager"), String::from("Monica"));
list.add_worker(String::from("Normal Worker"), String::from("Ana"));
list.add_worker(String::from("Normal Worker"), String::from("Alice"));
println!("{:#?}", list);
println!("{:?}", list.last_worker());
list.remove_worker();
list.remove_worker();
list.remove_worker();
println!("{:?}", list);
list.remove_worker();
println!("{:?}", list);
}
And its output:
$ cargo run
WorkEnvironment {
grade: Some(
Worker {
role: "Normal Worker",
name: "Alice",
next: Some(
Worker {
role: "Normal Worker",
name: "Ana",
next: Some(
Worker {
role: "Manager",
name: "Monica",
next: Some(
Worker {
role: "CEO",
name: "Marie",
next: None,
},
),
},
),
},
),
},
),
}
Some(("Alice", "Normal Worker"))
WorkEnvironment { grade: Some(Worker { role: "CEO", name: "Marie", next: None }) }
WorkEnvironment { grade: None }
$