Created
May 22, 2018 01:12
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| use std::collections::BTreeMap; | |
| use std::io::{self, Write}; | |
| pub struct Todo { | |
| name: String, | |
| checked: bool, | |
| priority: i32, | |
| } | |
| impl Todo { | |
| pub fn write<W: Write>(&self, w: &mut W) { | |
| write!(w, "{}:\n", self.name); | |
| write!(w, "Checked: {}\n", self.checked); | |
| write!(w, "Priority: {}\n", self.priority); | |
| write!(w, "\n"); | |
| } | |
| pub fn print(&self) { | |
| self.write(&mut io::stdout()); | |
| } | |
| } | |
| #[derive(Default)] | |
| pub struct TodoList { | |
| list: BTreeMap<i32, Vec<Todo>>, | |
| } | |
| impl TodoList { | |
| pub fn new() -> TodoList { | |
| TodoList { | |
| list: BTreeMap::new(), | |
| } | |
| } | |
| pub fn add(&mut self, todo: Todo) { | |
| let list = self.list.entry(todo.priority).or_insert_with(Vec::new); | |
| list.push(todo); | |
| } | |
| pub fn todos(&self) -> impl Iterator<Item = &Todo> { | |
| self.list.iter().flat_map(|(_, list)| list.iter()) | |
| } | |
| pub fn unchecked(&self) -> impl Iterator<Item = &Todo> { | |
| self.todos().filter(|t| !t.checked) | |
| } | |
| pub fn checked(&self) -> impl Iterator<Item = &Todo> { | |
| self.todos().filter(|t| t.checked) | |
| } | |
| } | |
| fn main() { | |
| let mut list = TodoList::new(); | |
| list.add(Todo { | |
| name: "A".to_string(), | |
| checked: false, | |
| priority: 10, | |
| }); | |
| list.add(Todo { | |
| name: "B".to_string(), | |
| checked: false, | |
| priority: 5, | |
| }); | |
| list.add(Todo { | |
| name: "C".to_string(), | |
| checked: false, | |
| priority: 6, | |
| }); | |
| list.add(Todo { | |
| name: "D".to_string(), | |
| checked: true, | |
| priority: 1, | |
| }); | |
| println!("Unchecked todos:"); | |
| for todo in list.unchecked() { | |
| todo.print(); | |
| } | |
| println!("Checked todos:"); | |
| for todo in list.checked() { | |
| todo.print(); | |
| } | |
| } |
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