Решение на упр.07 задача 1 от Мариян Момчилов

Обратно към всички решения

Към профила на Мариян Момчилов

Код

use std::num::ParseIntError;

struct Map<I, F, U>

where

I: Iterator,

F: FnMut(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: FnMut(I::Item) -> U,

{

Map { iter, f }

}

impl<I, F, U> Iterator for Map<I, F, U>

where

I: Iterator,

F: FnMut(I::Item) -> U,

{

type Item = U;

fn next(&mut self) -> Option<Self::Item> {

match self.iter.next() {

Some(item) => Some((self.f)(item)),

None => None,

}

}

}

struct Filter<I, F>

where

I: Iterator,

F: FnMut(&I::Item) -> bool,

{

iter: I,

f: F,

}

fn iter_filter<I, F>(iter: I, f: F) -> Filter<I, F>

where

I: Iterator,

F: FnMut(&I::Item) -> bool,

{

Filter { iter, f }

}

impl<I, F> Iterator for Filter<I, F>

where

I: Iterator,

F: FnMut(&I::Item) -> bool,

{

type Item = I::Item;

fn next(&mut self) -> Option<Self::Item> {

while let Some(item) = self.iter.next() {

if (self.f)(&item) {

return Some(item);

}

}

None

}

}

fn iter_filter_map<I, F, U>(iter: I, func: F) -> impl Iterator<Item = U>

where

I: Iterator,

F: Fn(I::Item) -> Option<U>,

{

iter_map(iter_filter(iter_map(iter, func), |e| !e.is_none()), |e| {

e.unwrap()

})

}

fn get_sum(text: &str) -> i32 {

iter_filter_map(

iter_map(

iter_filter(iter_map(text.lines(), |s| s.trim()), |s| s.len() > 0),

|s| s.split(' '),

)

.flatten(),

|s| i32::from_str_radix(s, 10).ok(),

)

.sum()

}

#[derive(Debug, Eq, PartialEq)]

struct FoundWord<'a>(&'a str);

fn get_num_list(text: &str) -> Result<Vec<i32>, FoundWord<'_>> {

iter_map(

iter_map(

iter_filter(iter_map(text.lines(), |s| s.trim()), |s| s.len() > 0),

|s| s.split(' '),

)

.flatten(),

|s| match i32::from_str_radix(s, 10) {

Err(_) => Err(FoundWord(s)),

Ok(i) => Ok(i),

},

)

.collect()

}

Лог от изпълнението

Updating crates.io index
     Locking 17 packages to latest compatible versions
   Compiling proc-macro2 v1.0.103
   Compiling quote v1.0.42
   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-project-lite v0.2.16
   Compiling memchr v2.7.6
   Compiling syn v2.0.111
   Compiling pin-utils v0.1.0
   Compiling futures-io v0.3.31
   Compiling futures-task v0.3.31
   Compiling slab v0.4.11
   Compiling solution v0.1.0 (/tmp/d20251127-1757769-ccbpq0/solution)
warning: unused import: `std::num::ParseIntError`
 --> src/lib.rs:1:5
  |
1 | use std::num::ParseIntError;
  |     ^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: struct `Map` is never constructed
 --> src/lib.rs:3:8
  |
3 | struct Map<I, F, U>
  |        ^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: function `iter_map` is never used
  --> src/lib.rs:12:4
   |
12 | fn iter_map<I, F, U>(iter: I, f: F) -> Map<I, F, U>
   |    ^^^^^^^^

warning: struct `Filter` is never constructed
  --> src/lib.rs:35:8
   |
35 | struct Filter<I, F>
   |        ^^^^^^

warning: function `iter_filter` is never used
  --> src/lib.rs:44:4
   |
44 | fn iter_filter<I, F>(iter: I, f: F) -> Filter<I, F>
   |    ^^^^^^^^^^^

warning: function `iter_filter_map` is never used
  --> src/lib.rs:69:4
   |
69 | fn iter_filter_map<I, F, U>(iter: I, func: F) -> impl Iterator<Item = U>
   |    ^^^^^^^^^^^^^^^

warning: function `get_sum` is never used
  --> src/lib.rs:79:4
   |
79 | fn get_sum(text: &str) -> i32 {
   |    ^^^^^^^

warning: struct `FoundWord` is never constructed
  --> src/lib.rs:92:8
   |
92 | struct FoundWord<'a>(&'a str);
   |        ^^^^^^^^^

warning: function `get_num_list` is never used
  --> src/lib.rs:94:4
   |
94 | fn get_num_list(text: &str) -> Result<Vec<i32>, FoundWord<'_>> {
   |    ^^^^^^^^^^^^

warning: `solution` (lib) generated 9 warnings (run `cargo fix --lib -p solution` to apply 1 suggestion)
   Compiling futures-macro v0.3.31
   Compiling futures-util v0.3.31
   Compiling futures-executor v0.3.31
   Compiling futures v0.3.31
warning: unused import: `std::num::ParseIntError`
 --> tests/../src/lib.rs:1:5
  |
1 | use std::num::ParseIntError;
  |     ^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: `solution` (test "solution_test") generated 1 warning (run `cargo fix --test "solution_test"` to apply 1 suggestion)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 8.67s
     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

История (1 версия и 1 коментар)