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![example4.rs （純関数
型）
不安定機能#![feature(core)]
#![feature(collections)]
use std::iter::AdditiveIterator;
fn main() {
let kanji_array : [String;3] = [
String::from_str("Rust is fun."),
String::from_str("You can use High Order Functions."),
String::from_str("I want to learn more.")];
let char_count = kanji_array.iter().map(|s : &String|s.len()).sum();
println!("Character count: {}", char_count);
}](https://image.slidesharecdn.com/rustpresentation-150409195323-conversion-gate01/85/Rust-15-320.jpg)
Uploaded byPaweł Rusin
Rust言語紹介
The document discusses Rust, a systems programming language developed by Mozilla. It provides an agenda, introduction to the speaker and company, why Rust was chosen, basic Rust concepts, and examples of Rust code. Memory safety is emphasized as Rust avoids vulnerabilities like memory leaks and use-after-free by using a borrow checker to validate references. Examples demonstrate immutable and mutable references, structs, functions, and memory management using Box to move values.
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Rust言語紹介
- 1.
- 2. 自己紹介 会社の紹介 なぜRustか? Rustの基本 アジェンダ
- 3. Paweł Rusin(パヴェウ・ルシン) pawel.rusin@brilliantservice.co.jp Facebook: Paweł Rusin (iofar@o2.pl) Twitter: RusinPaw 会社： 株式会社ブリリアントサービス 業務： 開発部のエンジニア（主にiOSアプリケーショ ン開発） 自己紹介
- 4. 株式会社ブリリアントサービス 本社：大阪 支社：東京（品川）、シリコンバレー アプリケーション開発、O2Oサービス開発、スマートデ バイス開発 会社の紹介
- 5. ジェスチャーで操作できる電脳メガネ ジェスチャー認識システム 拡張現実で独特な体験を提供 FreeBSDベース 開発言語はCとObjective-C... miramaについて
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- 10. 参照 ● Rust book: https://doc.rust-lang.org/book/(nightly bu ild) ● Rust documentation: http://doc.rust-lang.org/ ● IRC irc.mozilla.org #rust
- 11. $ curl -sf-L https://static.rust-lang.org/rustup.sh | sudo sh $ curl -f -L https://static.rust-lang.org/rustup.sh -O $ sudo sh rustup.sh インストール仕 方 バイナリかソースからインストール可能： http://www.rust-lang.org/install.html $ git clone https://github.com/yohanesu/tokyorust-part1
- 12. fn main() { println!("HelloWorld!"); } example1.rs マクロ $ rustc example1.rc $ ./example1
- 13. fn main() { letn = 5; if n < 0 { println!("{} is negative", n); } else if n > 0 { println!("{} is positive", n); } else { println!("{} is zero", n); } } example2.rs Non-mutable!
- 14. struct Rectangle{ x :i32, y : i32 } impl Rectangle{ fn area(&self) -> i32{ self.x*self.y } } fn main() { let rect = Rectangle{x:2,y:3}; println!("Rectangle area is {}",rect.area()); } example3.rs (OO P) struct定義でIV struct実装でメソッド
- 15. example4.rs （純関数 型） 不安定機能#![feature(core)] #![feature(collections)] use std::iter::AdditiveIterator; fn main(){ let kanji_array : [String;3] = [ String::from_str("Rust is fun."), String::from_str("You can use High Order Functions."), String::from_str("I want to learn more.")]; let char_count = kanji_array.iter().map(|s : &String|s.len()).sum(); println!("Character count: {}", char_count); }
- 16. example4.rs （純関数型） Rust is fun! Youcan use High Order Functions! I want to learn more! 12 33 21 61 sum() String.len() String.len() String.len() map()
- 17. メモリー管理 ● バッグの原因： – freeしない（メモリーリーク） – freeされたメモリーを使用 –二回目free – Null pointer dereference ● 対策 – Smart pointers – Garbage collector – ARC (Automatic reference counting)
- 18. borrow.rs （メモリー管理） fn main() { letx = 4; let y = &x; println!("Address of x is {:p} address of y is {:p}",&x,y); } Address of x is 0x7fff5fa1795c address of y is 0x7fff5fa1795c
- 19. –メモリー管理 immutable borr ow xx x y z
- 20. example5.rs （メモリー管 理） fn main() { letx = 4; let y = &x; println!("Address of x is {:p} address of y is {:p}",&x,y); *y = 1; } borrow.rs:6:4: 6:10 error: cannot assign to immutable borrowed content `*y` borrow.rs:6 *y = 1; ^~~~~~ error: aborting due to previous error
- 21. example5.rs （メモリー管 理） fn main() { letmut x = 4; let y = &x; println!("Address of x is {:p} address of y is {:p}",&x,y); *y = 1; } borrow.rs:6:4: 6:10 error: cannot assign to immutable borrowed content `*y` borrow.rs:6 *y = 1; ^~~~~~ error: aborting due to previous error
- 22. example5.rs （メモリー管 理） fn main() { letmut x = 4; let y = &mut x; println!("Address of x is {:p} address of y is {:p}",&x,y); *y = 1; } borrow.rs:5:58: 5:59 error: cannot borrow `x` as immutable because it is also borrowed as mutable borrow.rs:5 println!("Address of x is {:p} address of y is {:p}",&x,y); ^ note: in expansion of format_args! <std macros>:2:25: 2:58 note: expansion site <std macros>:1:1: 2:62 note: in expansion of print! <std macros>:3:1: 3:54 note: expansion site <std macros>:1:1: 3:58 note: in expansion of println! borrow.rs:5:4: 5:63 note: expansion site borrow.rs:4:17: 4:18 note: previous borrow of `x` occurs here; the mutable borrow prevents subsequent moves, borrows, or modification of `x` until the borrow ends borrow.rs:4 let y = &mut x; ^ borrow.rs:7:2: 7:2 note: previous borrow ends here borrow.rs:1 fn main() { ... borrow.rs:7 } ^ error: aborting due to previous error
- 23. example5.rs （メモリー管 理） fn main() { letmut x = 4; let y = &mut x; println!("Address of x is {:p} address of y is {:p}",&x,y); *y = 1; } borrow.rs:5:58: 5:59 error: cannot borrow `x` as immutable because it is also borrowed as mutable borrow.rs:5 println!("Address of x is {:p} address of y is {:p}",&x,y); ^ note: in expansion of format_args! <std macros>:2:25: 2:58 note: expansion site <std macros>:1:1: 2:62 note: in expansion of print! <std macros>:3:1: 3:54 note: expansion site <std macros>:1:1: 3:58 note: in expansion of println! borrow.rs:5:4: 5:63 note: expansion site borrow.rs:4:17: 4:18 note: previous borrow of `x` occurs here; the mutable borrow prevents subsequent moves, borrows, or modification of `x` until the borrow ends borrow.rs:4 let y = &mut x; ^ borrow.rs:7:2: 7:2 note: previous borrow ends here borrow.rs:1 fn main() { ... borrow.rs:7 } ^ error: aborting due to previous error
- 24. example5.rs （メモリー管 理） fn main() { letmut x = 4; let y = &mut x; //println!("Address of x is {:p} address of y is {:p}",&x,y); *y = 1; } 成功!
- 25. example5.rs （メモリー管 理） fn main() { letmut x = 4; if true { let y = &mut x; println!("Address of y is {:p}",y); *y = 1; } println!("Address of x is {:p}",&x); } Address of y is 0x7fff51b4795c Address of x is 0x7fff51b4795c yのlifetime = 借りる範囲
- 26. –メモリー管理 mutable borrow mutx x mut x mut y
- 27. example5.rs （メモリー管 理） fn main() { letx = Box::new(4); let y = x; println!("Value of y is {}",y); } Value of y is 4
- 28. example5.rs （メモリー管 理） fn main() { letx = Box::new(4); let y = x; println!("Value of y is {}",y); println!("Value of x is {}",x); } borrow.rs:6:32: 6:33 error: use of moved value: `x` borrow.rs:6 println!("Value of x is {}",x); ^ note: in expansion of format_args! <std macros>:2:25: 2:58 note: expansion site <std macros>:1:1: 2:62 note: in expansion of print! <std macros>:3:1: 3:54 note: expansion site <std macros>:1:1: 3:58 note: in expansion of println! borrow.rs:6:4: 6:35 note: expansion site borrow.rs:4:8: 4:9 note: `x` moved here because it has type `Box<i32>`, which is moved by default borrow.rs:4 let y = x; ^ borrow.rs:4:9: 4:9 help: use `ref` to override error: aborting due to previous error
- 29. example5.rs （メモリー管 理）fn main() { letx = Box::new(4); println!("Value of x is {}",x); if true { let y = x; println!("Value of y is {}",y); } println!("Value of x is {}",x); } borrow.rs:11:35: 11:36 error: use of moved value: `x` borrow.rs:11 println!("Value of x is {}",x); ^ note: in expansion of format_args! <std macros>:2:25: 2:58 note: expansion site <std macros>:1:1: 2:62 note: in expansion of print! <std macros>:3:1: 3:54 note: expansion site <std macros>:1:1: 3:58 note: in expansion of println! borrow.rs:11:7: 11:38 note: expansion site borrow.rs:8:11: 8:12 note: `x` moved here because it has type `Box<i32>`, which is moved by default borrow.rs:8 let y = x; ^ borrow.rs:8:12: 8:12 help: use `ref` to override error: aborting due to previous error yのlifetime
- 30. example5.rs （メモリー管 理）fn main() { letx = Box::new(4); println!("Value of x is {}",x); if true { let y = x; println!("Value of y is {}",y); x = y; } println!("Value of x is {}",x); } borrow.rs:11:35: 11:36 error: use of moved value: `x` borrow.rs:11 println!("Value of x is {}",x); ^ note: in expansion of format_args! <std macros>:2:25: 2:58 note: expansion site <std macros>:1:1: 2:62 note: in expansion of print! <std macros>:3:1: 3:54 note: expansion site <std macros>:1:1: 3:58 note: in expansion of println! borrow.rs:11:7: 11:38 note: expansion site borrow.rs:8:11: 8:12 note: `x` moved here because it has type `Box<i32>`, which is moved by default borrow.rs:8 let y = x; ^ borrow.rs:8:12: 8:12 help: use `ref` to override error: aborting due to previous error
- 31. example5.rs （メモリー管 理）fn main() { letmut x = Box::new(4); println!("Value of x is {}",x); if true { let y = x; println!("Value of y is {}",y); x = y; } println!("Value of x is {}",x); } Value of x is 4 Value of y is 4 Value of x is 4
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