Решение на упр.07 задача 1 от Димитър Колев
Резултати
- 4 точки от тестове
- 0 бонус точки
- 4 точки общо
- 2 успешни тест(а)
- 0 неуспешни тест(а)
Код
trait IteratorExt: Iterator {
fn my_map<F, U>(self, func: F) -> Map<Self, F, U>
where
F: Fn(Self::Item) -> U,
Self: Sized,
{
iter_map(self, func)
}
fn my_filter<F>(self, func: F) -> Filter<Self, F>
where
F: Fn(&Self::Item) -> bool,
Self: Sized,
{
iter_filter(self, func)
}
fn my_filter_map<F, U>(self, func: F) -> impl Iterator<Item = U>
where
F: Fn(Self::Item) -> Option<U>,
Self: Sized,
{
iter_filter_map(self, func)
}
}
impl<I> IteratorExt for I where I: Iterator {}
struct Map<I, F, U>
where
I: Iterator,
F: Fn(I::Item) -> U,
{
iter: I,
f: F,
}
fn iter_map<I, F, U>(iter: I, f: F) -> Map<I, F, U>
where
I: Iterator,
F: Fn(I::Item) -> U,
{
Map { iter, f }
}
impl<I, F, U> Iterator for Map<I, F, U>
where
I: Iterator,
F: Fn(I::Item) -> U,
{
type Item = U;
fn next(&mut self) -> Option<Self::Item> {
Some((self.f)(self.iter.next()?))
}
}
struct Filter<I, F>
where
I: Iterator,
F: Fn(&I::Item) -> bool,
{
iter: I,
f: F,
}
fn iter_filter<I, F>(iter: I, f: F) -> Filter<I, F>
where
I: Iterator,
F: Fn(&I::Item) -> bool,
{
Filter { iter, f }
}
impl<I, F> Iterator for Filter<I, F>
where
I: Iterator,
F: Fn(&I::Item) -> bool,
{
type Item = I::Item;
fn next(&mut self) -> Option<Self::Item> {
loop {
let x = self.iter.next()?;
if (self.f)(&x) {
break Some(x);
}
}
}
}
fn iter_filter_map<I, F, U>(iter: I, f: F) -> impl Iterator<Item = U>
where
I: Iterator,
F: Fn(I::Item) -> Option<U>,
{
iter.my_map(f)
.my_filter(Option::is_some)
.my_map(Option::unwrap)
}
fn get_sum(text: &str) -> i32 {
text.split_whitespace()
.my_filter_map(|x| x.parse::<i32>().ok())
.sum()
}
#[derive(Debug, Eq, PartialEq)]
struct FoundWord<'a>(&'a str);
fn get_num_list(text: &str) -> Result<Vec<i32>, FoundWord<'_>> {
text.split_whitespace()
.my_map(|x| x.parse::<i32>().map_err(|_| FoundWord(x)))
.collect::<Result<Vec<i32>, FoundWord>>()
}
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 v1.0.42
Compiling futures-core v0.3.31
Compiling futures-sink v0.3.31
Compiling futures-channel v0.3.31
Compiling futures-task v0.3.31
Compiling syn v2.0.111
Compiling pin-utils v0.1.0
Compiling pin-project-lite v0.2.16
Compiling memchr v2.7.6
Compiling futures-io v0.3.31
Compiling slab v0.4.11
Compiling solution v0.1.0 (/tmp/d20251127-1757769-1x6abl4/solution)
warning: trait `IteratorExt` is never used
--> src/lib.rs:1:7
|
1 | trait IteratorExt: Iterator {
| ^^^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: struct `Map` is never constructed
--> src/lib.rs:29:8
|
29 | struct Map<I, F, U>
| ^^^
warning: function `iter_map` is never used
--> src/lib.rs:38:4
|
38 | fn iter_map<I, F, U>(iter: I, f: F) -> Map<I, F, U>
| ^^^^^^^^
warning: struct `Filter` is never constructed
--> src/lib.rs:58:8
|
58 | struct Filter<I, F>
| ^^^^^^
warning: function `iter_filter` is never used
--> src/lib.rs:67:4
|
67 | fn iter_filter<I, F>(iter: I, f: F) -> Filter<I, F>
| ^^^^^^^^^^^
warning: function `iter_filter_map` is never used
--> src/lib.rs:92:4
|
92 | fn iter_filter_map<I, F, U>(iter: I, f: F) -> impl Iterator<Item = U>
| ^^^^^^^^^^^^^^^
warning: function `get_sum` is never used
--> src/lib.rs:102:4
|
102 | fn get_sum(text: &str) -> i32 {
| ^^^^^^^
warning: struct `FoundWord` is never constructed
--> src/lib.rs:109:8
|
109 | struct FoundWord<'a>(&'a str);
| ^^^^^^^^^
warning: function `get_num_list` is never used
--> src/lib.rs:111:4
|
111 | fn get_num_list(text: &str) -> Result<Vec<i32>, FoundWord<'_>> {
| ^^^^^^^^^^^^
warning: `solution` (lib) generated 9 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 8.44s
Running tests/solution_test.rs (target/debug/deps/solution_test-ee0783488e12dce9)
running 2 tests
test solution_test::test_adapters_ ... ok
test solution_test::test_text_parsers_ ... ok
test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s