Решение на упр.04 задача 2 от Пламен Колев
Резултати
- 2 точки от тестове
- 0 бонус точки
- 2 точки общо
- 4 успешни тест(а)
- 0 неуспешни тест(а)
Код
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[allow(dead_code)]
enum CompareResult {
Less,
Equal,
Greater,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[allow(dead_code)]
enum SortOrder {
Desc,
Asc,
}
#[derive(Clone)]
#[allow(dead_code)]
struct Book {
title: String,
author: String,
year: u32,
rating: f32,
}
trait Compare {
fn compare(&self, other: &Self) -> CompareResult;
}
trait Filter {
fn matches(&self, query: &str) -> bool;
}
trait Aggregate {
type Output;
fn aggregate(items: &[Self]) -> Self::Output
where
Self: Sized;
}
fn process_items<T>(items: Vec<T>, query: &str, order: SortOrder) -> (Vec<T>, T::Output)
where
T: Compare + Filter + Aggregate + Clone,
{
let mut filtered_items: Vec<T> = items.into_iter()
.filter(|i| i.matches(query))
.collect();
for i in 0..filtered_items.len(){
for j in i + 1..filtered_items.len() {
let is_swap = match order {
SortOrder::Asc => filtered_items[i].compare(&filtered_items[j]) == CompareResult::Greater,
SortOrder::Desc => filtered_items[i].compare(&filtered_items[j]) == CompareResult::Less,
};
if is_swap {
filtered_items.swap(i, j);
}
}
}
let aggregate = T::aggregate(&filtered_items);
(filtered_items, aggregate)
}
impl Compare for Book {
fn compare(&self, other: &Self) -> CompareResult {
if self.year < other.year {
CompareResult::Less
} else if self.year > other.year {
CompareResult::Greater
} else {
CompareResult::Equal
}
}
}
impl Filter for Book {
fn matches(&self, query: &str) -> bool {
if self.title.contains(query) || self.author.contains(query) {
true
} else {
false
}
}
}
impl Aggregate for Book {
type Output = f32;
fn aggregate(items: &[Self]) -> Self::Output
{
if items.is_empty() {
0.0
} else {
let total: f32 = items.iter().map(|b| b.rating).sum();
total / (items.len() as f32)
}
}
}
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-sink v0.3.31
Compiling futures-core v0.3.31
Compiling futures-channel v0.3.31
Compiling pin-utils v0.1.0
Compiling memchr v2.7.6
Compiling syn v2.0.109
Compiling slab v0.4.11
Compiling pin-project-lite v0.2.16
Compiling futures-task v0.3.31
Compiling futures-io v0.3.31
Compiling solution v0.1.0 (/tmp/d20251106-1757769-9dq6a0/solution)
warning: trait `Compare` is never used
--> src/lib.rs:26:7
|
26 | trait Compare {
| ^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: trait `Filter` is never used
--> src/lib.rs:30:7
|
30 | trait Filter {
| ^^^^^^
warning: trait `Aggregate` is never used
--> src/lib.rs:34:7
|
34 | trait Aggregate {
| ^^^^^^^^^
warning: function `process_items` is never used
--> src/lib.rs:41:4
|
41 | fn process_items<T>(items: Vec<T>, query: &str, order: SortOrder) -> (Vec<T>, T::Output)
| ^^^^^^^^^^^^^
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 9.18s
Running tests/solution_test.rs (target/debug/deps/solution_test-8c2c5f784503f204)
running 4 tests
test solution_test::test_aggregate ... ok
test solution_test::test_compare ... ok
test solution_test::test_matches ... ok
test solution_test::test_process ... ok
test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s