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README.md | 2 years ago |
README.md
how many references
Instructions
Create the following functions:
add_ele
: which adds an element to the value in theNode
.how_many_references
: which returns how many times the value is referenced in the code.rm_all_ref
: which accepts anRc<String>
and removes all elements from the vector that are equal to that value. This should only happen if the twoRc
s point to the same allocation.
Expected Functions and structures
pub use std::rc::Rc;
pub struct Node {
pub value: Vec<Rc<String>>,
}
impl Node {
pub fn new(value: Vec<Rc<String>>) -> Node {
Node { value: value }
}
pub fn add_ele(&mut self, v: Rc<String>) {}
pub fn rm_all_ref(&mut self, v: Rc<String>) {}
}
pub fn how_many_references(value: &Rc<String>) -> usize {}
Usage
Here is a program to test your functions,
use how_many_references::*;
fn main() {
let a = Rc::new(String::from("a"));
let b = Rc::new(String::from("b"));
let c = Rc::new(String::from("c"));
let a1 = Rc::new(String::from("a"));
let mut new_node = Node::new(vec![a.clone()]);
new_node.add_ele(b.clone());
new_node.add_ele(a.clone());
new_node.add_ele(c.clone());
new_node.add_ele(a.clone());
println!("a: {:?}", how_many_references(&a));
println!("b: {:?}", how_many_references(&b));
println!("c: {:?}", how_many_references(&c));
new_node.rm_all_ref(a1.clone());
new_node.rm_all_ref(a.clone());
println!("a: {:?}", how_many_references(&a));
println!("b: {:?}", how_many_references(&b));
println!("c: {:?}", how_many_references(&c));
}
And its output:
$ cargo run
a: 4
b: 2
c: 2
a: 1
b: 2
c: 2
$