forked from root/public
lee
3 years ago
2 changed files with 88 additions and 1 deletions
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## lunch_queue |
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### Instructions |
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You will have to create an API to organize a queue of people. |
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Using the given code create the following functions: |
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- `new` that will initialize the `Queue`. |
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- `add` that receives the person's information, so it can be added to the `Queue` |
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- `invert_queue` that invert the queue of persons |
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- `rm`, that will remove the person that finished ordering their food. |
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The method for organizing the manipulation of a data structure should be a |
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FIFO (first in first out) process. This function should return a tuple wrapped in an `Option` |
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with the information of that person |
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- `search`, that return a tuple with the information of a given person `id`. |
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You must also create a type called `Link` this will be the connection of the structures `Queue` and `Person`. |
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Do not forget that this will be a recursion type and it must point to `None` if there is no persons. |
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### Expected Function |
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```rust |
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pub struct Queue { |
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pub node: Link, |
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} |
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pub type Link = |
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pub struct Person { |
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pub id: i32, |
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pub name: String, |
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} |
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impl Queue { |
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pub fn new() -> Queue {} |
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pub fn add(&mut self, t: String, name: String) {} |
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pub fn invert_queue(&mut self) {} |
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pub fn rm(&mut self) -> Option<String> {} |
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pub fn search(&self) -> Option<(String, String)> {} |
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} |
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``` |
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### Usage |
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Here is a program to test your function |
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```rust |
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fn main() { |
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let mut list = Queue::new(); |
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list.add(String::from("Marie"), 20); |
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list.add(String::from("Monica"), 15); |
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list.add(String::from("Ana"), 5); |
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list.add(String::from("Alice"), 35); |
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println!("{:?}", list); |
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println!("{:?}", list.search("Marie")); |
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println!("{:?}", list.search("Alice")); |
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println!("{:?}", list.search("someone")); |
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println!("removed {:?}", list.rm()); |
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println!("list {:?}", list); |
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println!("invert {:?}", list.invert_queue()); |
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} |
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``` |
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And its output: |
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```console |
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student@ubuntu:~/[[ROOT]]/test$ cargo run |
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Queue { node: Some(Person { name: "Alice", discount: 35, next_person: Some(Person { name: "Ana", discount: 5, next_person: Some(Person { name: "Monica", discount: 15, next_person: Some(Person { name: "Marie", discount: 20, next_person: None }) }) }) }) } |
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Some(("Marie", 20)) |
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Some(("Alice", 35)) |
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None |
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removed Some(("Marie", 20)) |
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removed Some(("Monica", 15)) |
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list Queue { node: Some(Person { name: "Alice", discount: 35, next_person: Some(Person { name: "Ana", discount: 5, next_person: None }) }) } |
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inverted list Queue { node: Some(Person { name: "Ana", discount: 5, next_person: Some(Person { name: "Alice", discount: 35, next_person: None }) }) } |
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student@ubuntu:~/[[ROOT]]/test$ |
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``` |
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### Notions |
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- https://doc.rust-lang.org/rust-by-example/custom_types/enum.html |
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- https://doc.rust-lang.org/book/ch15-01-box.html |
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- https://doc.rust-lang.org/std/option/ |
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- https://doc.rust-lang.org/book/ch15-01-box.html |
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