rustの構造体を使ったプログラムの実装

Question

rustの構造体を使って以下のことを実装したい

set_enable関数はenabledをtrue(1)にする
set_direction関数はenabledがtrueではないとき処理を抜け、trueである場合directionをtrueに
set_output_statusはenabledがtrueではないかつdirectionもtrueではないとき処理を抜け
trueである場合　outputをtrueにする

struct Gpio{
    enabled:bool,
    direction:bool,
    output:bool,
    mode:u32
}

impl Gpio{
    pub fn set_enable(&mut self){
        self.enabled=true;
    }

    pub fn set_direction(&mut self){
        if self.enabled=!true{
            Err();
        }
        self.direction=true;
    }

    pub fn set_output_status(&mut self){
        if self.enabled=!true{
            Err();
        }
        if self.direction=!true{
            Err();
        }
        self.output=true;
    }
}

fn main(){
    let mut gpio=Gpio{
        enabled:true,
        direction:true,
        output:true,
    };
    gpio.set_enable();
    let pin=gpio.set_enable();
    println!("{}",pin);
}

実行すると以下のようなエラーが出ますがどこをどう修正すればいいかわかりません
助言をお願いしたいです

rror[E0425]: cannot find value `enabled` in this scope
  --> src\main.rs:10:9
   |
10 |         enabled=true;
   |         ^^^^^^^ help: you might have meant to use the available field: `self.enabled`

error[E0425]: cannot find value `enabled` in this scope
  --> src\main.rs:14:12
   |
14 |         if enabled=!true{
   |            ^^^^^^^
   |
help: you might have meant to use pattern matching
   |
14 |         if let enabled=!true{
   |            ^^^
help: you might have meant to use the available field
   |
14 |         if self.enabled=!true{
   |            ^^^^^^^^^^^^

error[E0425]: cannot find value `direction` in this scope
  --> src\main.rs:17:9
   |
17 |         direction=true;
   |         ^^^^^^^^^ help: you might have meant to use the available field: `self.direction`

error[E0425]: cannot find value `enabled` in this scope
  --> src\main.rs:21:12
   |
21 |         if enabled=!true{
   |            ^^^^^^^
   |
help: you might have meant to use pattern matching
   |
21 |         if let enabled=!true{
   |            ^^^
help: you might have meant to use the available field
   |
21 |         if self.enabled=!true{
   |            ^^^^^^^^^^^^

error[E0425]: cannot find value `direction` in this scope
  --> src\main.rs:24:12
   |
24 |         if direction=!true{
   |            ^^^^^^^^^
   |
help: you might have meant to use pattern matching
   |
24 |         if let direction=!true{
   |            ^^^
help: you might have meant to use the available field
   |
24 |         if self.direction=!true{
   |            ^^^^^^^^^^^^^^

error[E0425]: cannot find value `output` in this scope
  --> src\main.rs:27:9
   |
27 |         output=true;
   |         ^^^^^^ help: you might have meant to use the available field: `self.output`

error[E0061]: this function takes 1 argument but 0 arguments were supplied
  --> src\main.rs:15:13
   |
15 |             Err();
   |             ^^^-- supplied 0 arguments
   |             |
   |             expected 1 argument

error[E0061]: this function takes 1 argument but 0 arguments were supplied
  --> src\main.rs:22:13
   |
22 |             Err();
   |             ^^^-- supplied 0 arguments
   |             |
   |             expected 1 argument

error[E0061]: this function takes 1 argument but 0 arguments were supplied
  --> src\main.rs:25:13
   |
25 |             Err();
   |             ^^^-- supplied 0 arguments
   |             |
   |             expected 1 argument

error[E0063]: missing field `mode` in initializer of `Gpio`
  --> src\main.rs:32:18
   |
32 |     let mut gpio=Gpio{
   |                  ^^^^ missing `mode`

error[E0277]: `()` doesn't implement `std::fmt::Display`
  --> src\main.rs:39:19
   |
39 |     println!("{}",pin);
   |                   ^^^ `()` cannot be formatted with the default formatter
   |
   = help: the trait `std::fmt::Display` is not implemented for `()`
   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
   = note: required by `std::fmt::Display::fmt`
   = note: this error originates in the macro `$crate::format_args_nl` (in Nightly builds, run with -Z macro-backtrace for more info)      

error: aborting due to 11 previous errors

Some errors have detailed explanations: E0061, E0063, E0277, E0425.
For more information about an error, try `rustc --explain E0061`.
error: could not compile `test_cargo`

To learn more, run the command again with --verbose.

Comments

[ozwk]

過去の質問が4つほど放置されています。処理してください。

[takahashi1031]

Err()で処理を抜ける方法がわかりません。Result型というのにしなくてはいけないようですが
breakでifを抜けれるかと思いやってみるとエラーが出てしまいます。
ここも助言いただければ幸いです

Answer 1

=!ではなく!=です。
Err()は引数が1つ必要です。
let mut gpio=Gpio{...で、フィールド:modeの初期化がされてません。
let pin=gpio.set_enable();とありますが、これは何がしたいのでしょう? set_enable()は何も返しません。

---

set_direction関数はenabledがtrueではないとき処理を抜け、trueである場合directionをtrueに

この、「処理を抜け」るが本当にただ何もせずに処理を抜けるだけならreturn;と書きましょう。