New for loops in Rust
How to handle iteration in Rust has been a hotly debated topic for many months. We have several loop constructs but generally prefer to loop using higher order functions. A recent change by marijn makes for aware of how to iterate using higher-order functions and stack-based lambdas, while still allowing loop control flow using break, cont and even ret. The bottom line is that you can now write: f
Rust's object system · baby steps
This blog is where I post up various half-baked ideas that I have. All PostsCategoriesGitHubTwitterRSS/Atom feedsSelected posts: The borrow checker withinEmpathy in open source: be gentle with each other On the rust-dev mailing list, someone pointed out another “BitC retrospective†post by Jonathon Shapiro concerning typeclasses. The Rust object system provides interesting solutions to some of the
Rust 㧠Generic ãªæ•°å€¤åž‹ã‚’作る - gifnksmã®é›‘多ãªãƒ¡ãƒ¢
ã¡ã¾ãŸã§è©±é¡Œ(？) ã® Rust 言語。昨年末ãらã„ã‹ã‚‰ã€Œæ—¥æœ¬èªžæƒ…å ±ãŒå…¨ç„¶ç„¡ã„ã€å…ˆé§†è€…ã«ãªã‚‹ãƒãƒ£ãƒ³ã‚¹ï¼ã€ã¨ã‹æ€ã„ãªãŒã‚‰ã®ã‚ã®ã‚ã—ã¦ãŸã‚‰ã€å…ˆæ—¥ã®0.1版発表ã§ä¸€æ°—ã«çŸ¥å度ãŒä¸ŠãŒã£ã¦ã—ã¾ã„(´・ω・`)ã¨ã—ã¦ã„ã‚‹gifnksmã§ã™ã€‚ 0.1リリースã§ã„ã‚ã„ã‚変ã‚ã‚Šã¾ã—ãŸã。tag ㌠enum ã«ãªã£ãŸã‚Šã€alt ã§åˆ—挙型ã®å€¤ã§åˆ†å²ã™ã‚‹ã¨ãã«æœ«å°¾ã«ã©ã£ã¨(.) ã‚’ã¤ã‘ãªãã¦ã‚‚よããªã£ãŸã‚Šã€‚実装ã™ã‚‹äºˆå®šã®æ©Ÿèƒ½(Proposals · graydon/rust Wiki · GitHub) ã‚‚ã¾ã ã¾ã ãŸãã•ã‚“ã‚ã‚Šã€ä»Šå¾Œã«ã¾ã™ã¾ã™æœŸå¾…ã§ã™ã€‚ ã•ã¦ã•ã¦ã€ãã‚“ãªRust言語ã§ã€ Generic ãªæ•´æ•°åž‹ã‚’作ã£ã¦ã¿ã¾ã—ãŸã€‚ ãªãœä½œã£ãŸã‹ã¨è¨€ã„ã¾ã™ã¨ã€ä»¥ä¸‹ã®ã‚ˆã†ãªã‚³ãƒ¼ãƒ‰ã‚’普通ã«ã‚³ãƒ³ãƒ‘イルã—ãŸå ´åˆã€ fn add<T>(a: T, b: T) -> T { a + b } 以下ã®ã‚ˆã†ãªã‚¨ãƒ©ãƒ¼ã§ã‚³ãƒ³ãƒ‘イルãŒé€šã‚‰
Rust 言語ã®äº‹å‰æ¡ä»¶åˆ¶ç´„ - ヤルã‚デナイズド
追記：以下ã®è¨˜è¿°ã¯å¤ããªã£ã¦ã„る。事å‰æ¡ä»¶åˆ¶ç´„ã¯ã™ã§ã«è¨€èªžã‹ã‚‰å–り除ã‹ã‚ŒãŸã€‚ Rust 言語ã§ã¯é–¢æ•°ã«äº‹å‰æ¡ä»¶ã‚’指定ã™ã‚‹ã“ã¨ãŒã§ãる。 use std; // predicate pure fn is_even(x: int) -> bool { ret x % 2 == 0; } fn print_even_number(x: int) : is_even(x) { std::io::println(#fmt("%d", x)); } fn main(args: [str]) { let x = 42; check is_even(x); print_even_number(x); }bool を返㙠pure 関数㯠predicate ã¨å‘¼ã°ã‚Œã‚‹ã€‚ã„ã‹ãªã‚‹é–¢æ•°ã«ã‚‚事å‰æ¡ä»¶ã¨ã—㦠predicate を指定ã™ã‚‹ã“ã¨ãŒã§ãる。事å‰æ¡ä»¶ pred_fn(x) ã‚’æŒã¤é–¢æ•°ã‚’呼ã¶ã¨ãã¯ã€äº‹å‰ã«
Rust 言語ã®ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ - ヤルã‚デナイズド
追記：以下ã®è¨˜è¿°ã¯å¤ããªã£ã¦ã„る。インターフェースã¯ã™ã§ã«è¨€èªžã‹ã‚‰å–り除ã‹ã‚ŒãŸã€‚ Rust 言語ã®ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã¯ã€ã‚ã‚‹åž‹ã®å€¤ã«é©ç”¨ã§ãる関数ã®ã‚»ãƒƒãƒˆã‚’定義ã™ã‚‹ã‚‚ã®ã€‚ iface prettifier { fn to_pretty_str() -> str; }ã‚ã‚‹åž‹ã«ã¤ã„ã¦ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã‚’実装ã™ã‚‹ã¨ã€ãã®åž‹ã®å€¤ value ã«å¯¾ã—㦠value.some_func() ã¨ã„ã†æ§‹æ–‡ã§é–¢æ•°ã‚’呼ã³å‡ºã›ã‚‹ã€‚関数内ã§ã¯ã€ value 㯠self ã¨ã—ã¦å‚ç…§ã§ãる。 impl of prettifier for uint { fn to_pretty_str() -> str { #fmt("unsigned int %u", self) } } impl of to_str for int { fn to_pretty_str() -> str { #fmt("int %d", self)
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