learn_rust_bugs 0.1.0

Self-learning Rust
Documentation 
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use super::*;

pub trait State {
    fn request_review(self: Box<Self>) -> Box<dyn State>;
    fn approve(self: Box<Self>) -> Box<dyn State>;
    fn content<'a>(&self, post: &'a Post) -> &'a str {
        ""
    }
}

pub struct Draft {}
struct PendingReview {}
struct Approved {}

impl State for Draft {
    fn request_review(self: Box<Self>) -> Box<dyn State> {
        Box::new(PendingReview {})
    }
    fn approve(self: Box<Self>) -> Box<dyn State> {
        self
    }
}

impl State for PendingReview {
    fn request_review(self: Box<Self>) -> Box<dyn State> {
        self
    }
    fn approve(self: Box<Self>) -> Box<dyn State> {
        Box::new(Approved {})
    }
}

impl State for Approved {
    fn request_review(self: Box<Self>) -> Box<dyn State> {
        self
    }
    fn approve(self: Box<Self>) -> Box<dyn State> {
        self
    }
    fn content<'a>(&self, post: &'a Post) -> &'a str {
        &post.content
    }
}