Решение на упр.04 задача 2 от Константин Илиев
Към профила на Константин Илиев
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)]
enum CompareResult {
Less,
Equal,
Greater,
}
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;
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum SortOrder{
Desc,
Asc,
}
fn process_items<T>(items: Vec<T>, query: &str, order: SortOrder) -> (Vec<T>, T::Output)
where
T: Compare + Filter + Aggregate + Clone,
{
let mut filtered = Vec::new();
for item in items {
if item.matches(query){
filtered.push(item);
}
}
let n = filtered.len();
for i in 0..n{
let mut max = i;
for j in (i + 1)..n{
let compare = filtered[j].compare(&filtered[max]);
let compare_result = match order{
SortOrder::Asc => compare == CompareResult::Less,
SortOrder::Desc => compare == CompareResult::Greater,
};
if compare_result{
max = j;
}
}
if max != i {filtered.swap(i, max);}
}
let aggregate_filtered = T::aggregate(&filtered);
(filtered, aggregate_filtered)
}
#[derive(Clone)]
struct Book {
title: String,
author: String,
year: u32,
rating: f32,
}
impl Filter for Book{
fn matches(&self, query: &str) -> bool{
let key = query.to_lowercase();
self.title.to_lowercase().contains(&key) || self.author.to_lowercase().contains(&key)
}
}
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 Aggregate for Book{
type Output = f32;
fn aggregate(items: &[Self]) -> Self::Output{
let mut sum: f32 = 0.0;
for book in items{
sum += book.rating;
}
sum / (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 unicode-ident v1.0.22
Compiling quote v1.0.41
Compiling futures-sink v0.3.31
Compiling futures-core v0.3.31
Compiling futures-channel v0.3.31
Compiling futures-io v0.3.31
Compiling pin-project-lite v0.2.16
Compiling syn v2.0.109
Compiling pin-utils v0.1.0
Compiling slab v0.4.11
Compiling futures-task v0.3.31
Compiling memchr v2.7.6
Compiling solution v0.1.0 (/tmp/d20251106-1757769-g8i1h0/solution)
warning: enum `CompareResult` is never used
--> src/lib.rs:2:6
|
2 | enum CompareResult {
| ^^^^^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: trait `Compare` is never used
--> src/lib.rs:8:7
|
8 | trait Compare {
| ^^^^^^^
warning: trait `Filter` is never used
--> src/lib.rs:12:7
|
12 | trait Filter {
| ^^^^^^
warning: trait `Aggregate` is never used
--> src/lib.rs:16:7
|
16 | trait Aggregate{
| ^^^^^^^^^
warning: enum `SortOrder` is never used
--> src/lib.rs:24:6
|
24 | enum SortOrder{
| ^^^^^^^^^
warning: function `process_items` is never used
--> src/lib.rs:29:4
|
29 | fn process_items<T>(items: Vec<T>, query: &str, order: SortOrder) -> (Vec<T>, T::Output)
| ^^^^^^^^^^^^^
warning: struct `Book` is never constructed
--> src/lib.rs:62:8
|
62 | struct Book {
| ^^^^
warning: `solution` (lib) generated 7 warnings
Compiling futures-macro v0.3.31
Compiling futures-util v0.3.31
Compiling futures-executor v0.3.31
Compiling futures v0.3.31
warning: variant `Asc` is never constructed
--> tests/../src/lib.rs:26:5
|
24 | enum SortOrder{
| --------- variant in this enum
25 | Desc,
26 | Asc,
| ^^^
|
= note: `SortOrder` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
= note: `#[warn(dead_code)]` on by default
warning: `solution` (test "solution_test") generated 1 warning
Finished `test` profile [unoptimized + debuginfo] target(s) in 8.74s
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