restaurant: Add example on modules/structure/...

restaurant/Cargo.toml

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+[package]
+name = "restaurant"
+version = "0.1.0"
+authors = ["laurens <miers132@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

restaurant/src/back_of_house.rs

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+pub mod cooking;

restaurant/src/back_of_house/cooking.rs

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+pub struct Breakfast {      // Struct is public but its members aren't!
+    pub toast: String,	// Customer can choose which toast he wants
+    seasonal_fruit: String,	// Only chef can choose fruit that is served
+}
+
+pub enum Appetizer {	// Enum is public and its possible variants too!
+    Soup,
+    Salad,
+}
+
+fn do_nothing() {}
+
+fn fix_incorrect_order() {
+    cook_order();
+
+    crate::serve_order();
+}
+
+fn cook_order() {}
+
+impl Breakfast {
+    pub fn summer(toast: &str) -> Breakfast {
+        Breakfast {
+        toast: String::from(toast),
+        seasonal_fruit: String::from("peaches"),
+        }
+    }
+}

restaurant/src/front_of_house.rs

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+pub mod hosting;

restaurant/src/front_of_house/hosting.rs

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+pub fn add_to_waitlist() {}

restaurant/src/lib.rs

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+use std::collections::*;
+use std::{self, cmp::Ordering, io};
+
+mod front_of_house;
+
+pub use crate::front_of_house::hosting;
+// pub use front_of_house::hosting;
+
+mod back_of_house;
+
+use crate::back_of_house::cooking::Breakfast as boh_breakfast;
+use back_of_house::cooking;
+
+mod util;
+
+pub fn eat_at_restaurant() {
+    // // Absolute path
+    crate::front_of_house::hosting::add_to_waitlist();
+
+    // // Relative path
+    front_of_house::hosting::add_to_waitlist();
+
+    // // Making use of the 'use' keyword
+    hosting::add_to_waitlist();
+
+    // Order a breakfast in the summer with Rye toast
+    let mut meal = boh_breakfast::summer("Rye");
+    // Change our mind about what bread we'd like
+    meal.toast = String::from("Wheat");
+    println!("I'd like {} toast please", meal.toast);
+
+    // The next line won't compile if we uncomment it; we're not allowed
+    // to see or modify the seasonal fruit that comes with the meal
+    // meal.seasonal_fruit = String::from("blueberries");
+
+    let order1 = cooking::Appetizer::Soup;
+    let order2 = cooking::Appetizer::Salad;
+
+    util::get_cutlery();
+}
+
+fn serve_order() {}

restaurant/src/util.rs

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+pub fn get_cutlery() {}