Решение на упр.03 задача 3 от Владимир Великов
Към профила на Владимир Великов
Резултати
- 2 точки от тестове
- 0 бонус точки
- 2 точки общо
- 2 успешни тест(а)
- 0 неуспешни тест(а)
Код
use std::collections::HashMap;
enum Event {
Login { user: String, timestamp: u64 },
Logout { user: String, timestamp: u64 },
Purchase { user: String, item: String, amount: f64, timestamp: u64 },
Error { code: i32, message: String, timestamp: u64 },
}
struct EventLog {
events: Vec<Event>,
}
impl Event {
fn timestamp(&self) -> u64 {
match self {
Event::Login { timestamp, .. } => *timestamp,
Event::Logout { timestamp, .. } => *timestamp,
Event::Purchase { timestamp, .. } => *timestamp,
Event::Error { timestamp, .. } => *timestamp,
}
}
}
impl EventLog {
fn new() -> EventLog {
EventLog { events: Vec::new() }
}
fn add_event(&mut self, event: Event) {
self.events.push(event);
}
fn user_spent(&self, user: &str) -> f64 {
self.events.iter()
.filter_map(|event| {
match event {
Event::Purchase { user: event_user, amount, .. } if event_user == user => Some(*amount),
_ => None,
}
})
.sum()
}
fn summaries_by_type(&self) -> HashMap<String, usize> {
let mut counts: HashMap<String, usize> = HashMap::new();
for event in &self.events {
let type_name = match event {
Event::Login { .. } => "Login",
Event::Logout { .. } => "Logout",
Event::Purchase { .. } => "Purchase",
Event::Error { .. } => "Error",
};
*counts.entry(type_name.to_string()).or_insert(0) += 1;
}
counts
}
fn filter_events(&self, user: Option<&str>, after: Option<u64>) -> Vec<&Event> {
self.events.iter()
.filter(|event| {
let pass_time_filter = match after {
None => true,
Some(t) => event.timestamp() > t,
};
let pass_user_filter = match user {
None => true,
Some(u) => {
match event {
Event::Login { user, .. } => user == u,
Event::Logout { user, .. } => user == u,
Event::Purchase { user, .. } => user == u,
Event::Error { .. } => false,
}
}
};
pass_time_filter && pass_user_filter
})
.collect()
}
}
Лог от изпълнението
Updating crates.io index
Locking 17 packages to latest compatible versions
Compiling proc-macro2 v1.0.103
Compiling quote v1.0.41
Compiling unicode-ident v1.0.22
Compiling futures-core v0.3.31
Compiling futures-sink v0.3.31
Compiling futures-channel v0.3.31
Compiling pin-utils v0.1.0
Compiling memchr v2.7.6
Compiling syn v2.0.108
Compiling pin-project-lite v0.2.16
Compiling futures-io v0.3.31
Compiling futures-task v0.3.31
Compiling slab v0.4.11
Compiling solution v0.1.0 (/tmp/d20251030-1757769-fp5o4r/solution)
warning: enum `Event` is never used
--> src/lib.rs:3:6
|
3 | enum Event {
| ^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: struct `EventLog` is never constructed
--> src/lib.rs:10:8
|
10 | struct EventLog {
| ^^^^^^^^
warning: method `timestamp` is never used
--> src/lib.rs:15:8
|
14 | impl Event {
| ---------- method in this implementation
15 | fn timestamp(&self) -> u64 {
| ^^^^^^^^^
warning: associated items `new`, `add_event`, `user_spent`, `summaries_by_type`, and `filter_events` are never used
--> src/lib.rs:27:8
|
25 | impl EventLog {
| ------------- associated items in this implementation
26 |
27 | fn new() -> EventLog {
| ^^^
...
31 | fn add_event(&mut self, event: Event) {
| ^^^^^^^^^
...
35 | fn user_spent(&self, user: &str) -> f64 {
| ^^^^^^^^^^
...
46 | fn summaries_by_type(&self) -> HashMap<String, usize> {
| ^^^^^^^^^^^^^^^^^
...
63 | fn filter_events(&self, user: Option<&str>, after: Option<u64>) -> Vec<&Event> {
| ^^^^^^^^^^^^^
warning: `solution` (lib) generated 4 warnings
Compiling futures-macro v0.3.31
Compiling futures-util v0.3.31
Compiling futures-executor v0.3.31
Compiling futures v0.3.31
Finished `test` profile [unoptimized + debuginfo] target(s) in 9.76s
Running tests/solution_test.rs (target/debug/deps/solution_test-bfd50394249726db)
running 2 tests
test solution_test::test_empty ... ok
test solution_test::test_basic ... ok
test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s