Решение на упр.03 задача 3 от Виктор Карталов

Обратно към всички решения

Към профила на Виктор Карталов

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 EventLog {

fn new() -> Self {

Self { 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(|e| match e {

Event::Purchase { user: u, amount, .. } if u == user => Some(*amount), _ => None,

}).sum()

}

fn summaries_by_type(&self) -> HashMap<String, usize> {

let mut map = HashMap::new();

for e in &self.events {

let key = match e {

Event::Login { .. } => "Login",

Event::Logout { .. } => "Logout",

Event::Purchase { .. } => "Purchase",

Event::Error { .. } => "Error",

};

*map.entry(key.to_string()).or_insert(0) += 1;

}

map

}

}

Лог от изпълнението

Updating crates.io index
     Locking 17 packages to latest compatible versions
   Compiling proc-macro2 v1.0.103
   Compiling unicode-ident v1.0.22
   Compiling quote v1.0.41
   Compiling futures-core v0.3.31
   Compiling futures-sink v0.3.31
   Compiling futures-channel v0.3.31
   Compiling memchr v2.7.6
   Compiling syn v2.0.108
   Compiling pin-project-lite v0.2.16
   Compiling pin-utils v0.1.0
   Compiling futures-task v0.3.31
   Compiling futures-io v0.3.31
   Compiling slab v0.4.11
   Compiling solution v0.1.0 (/tmp/d20251030-1757769-1hdqt8u/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: associated items `new`, `add_event`, `user_spent`, and `summaries_by_type` are never used
  --> src/lib.rs:16:8
   |
14 | impl EventLog {
   | ------------- associated items in this implementation
15 |
16 |     fn new() -> Self {
   |        ^^^
...
20 |     fn add_event(&mut self, event: Event) {
   |        ^^^^^^^^^
...
24 |     fn user_spent(&self, user: &str) -> f64 {
   |        ^^^^^^^^^^
...
30 |     fn summaries_by_type(&self) -> HashMap<String, usize> {
   |        ^^^^^^^^^^^^^^^^^

warning: `solution` (lib) generated 3 warnings
   Compiling futures-macro v0.3.31
   Compiling futures-util v0.3.31
   Compiling futures-executor v0.3.31
   Compiling futures v0.3.31
error[E0599]: no method named `filter_events` found for struct `EventLog` in the current scope
  --> tests/solution_test.rs:14:26
   |
14 |     assert!(matches!(log.filter_events(None, None).as_slice(), &[]));
   |                          ^^^^^^^^^^^^^ method not found in `EventLog`
   |
  ::: tests/../src/lib.rs:10:1
   |
10 | struct EventLog {
   | --------------- method `filter_events` not found for this struct

error[E0599]: no method named `filter_events` found for struct `EventLog` in the current scope
  --> tests/solution_test.rs:15:26
   |
15 |     assert!(matches!(log.filter_events(Some("Пешо"), None).as_slice(), &[]));
   |                          ^^^^^^^^^^^^^ method not found in `EventLog`
   |
  ::: tests/../src/lib.rs:10:1
   |
10 | struct EventLog {
   | --------------- method `filter_events` not found for this struct

error[E0599]: no method named `filter_events` found for struct `EventLog` in the current scope
  --> tests/solution_test.rs:16:26
   |
16 |     assert!(matches!(log.filter_events(None, Some(100)).as_slice(), &[]));
   |                          ^^^^^^^^^^^^^ method not found in `EventLog`
   |
  ::: tests/../src/lib.rs:10:1
   |
10 | struct EventLog {
   | --------------- method `filter_events` not found for this struct

error[E0599]: no method named `filter_events` found for struct `EventLog` in the current scope
  --> tests/solution_test.rs:86:28
   |
86 |         let filtered = log.filter_events(Some("Пешо"), None);
   |                            ^^^^^^^^^^^^^ method not found in `EventLog`
   |
  ::: tests/../src/lib.rs:10:1
   |
10 | struct EventLog {
   | --------------- method `filter_events` not found for this struct

error[E0599]: no method named `filter_events` found for struct `EventLog` in the current scope
   --> tests/solution_test.rs:120:28
    |
120 |         let filtered = log.filter_events(None, Some(139));
    |                            ^^^^^^^^^^^^^ method not found in `EventLog`
    |
   ::: tests/../src/lib.rs:10:1
    |
10  | struct EventLog {
    | --------------- method `filter_events` not found for this struct

error[E0599]: no method named `filter_events` found for struct `EventLog` in the current scope
   --> tests/solution_test.rs:143:28
    |
143 |         let filtered = log.filter_events(Some("Тошо"), Some(130));
    |                            ^^^^^^^^^^^^^ method not found in `EventLog`
    |
   ::: tests/../src/lib.rs:10:1
    |
10  | struct EventLog {
    | --------------- method `filter_events` not found for this struct

For more information about this error, try `rustc --explain E0599`.
error: could not compile `solution` (test "solution_test") due to 6 previous errors

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