{"id":45793,"date":"2023-09-27T21:09:02","date_gmt":"2023-08-29T09:39:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/"},"modified":"2024-05-04T01:52:23","modified_gmt":"2024-05-03T17:52:23","slug":"45793-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/","title":{"rendered":""},"content":{"rendered":"

\u74b0\u5883<\/h1>\n

Rust 1.6.0\u3092\u524d\u63d0\u306b\u3002
\n\u3068\u306f\u3044\u3048\u3001\u591a\u5c11\u53e4\u304f\u3066\u3082\u554f\u984c\u306a\u3044\u306f\u305a\u3002<\/p>\n

\u524d\u63d0<\/h2>\n
for<\/span> i<\/span> in<\/span> x<\/span> {<\/span>\r\n    foo<\/span>(<\/span>i<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3068\u3044\u3046\u306e\u306f\u3001<\/p>\n
{<\/span>\r\n    let<\/span> mut<\/span> anonymous_iter<\/span> =<\/span> x<\/span>.into_iter<\/span>();<\/span>\r\n    while<\/span> let<\/span> Some<\/span>(<\/span>i<\/span>)<\/span> =<\/span> anonymous_iter<\/span>.next<\/span>()<\/span> {<\/span>\r\n        foo<\/span>(<\/span>i<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3068\u540c\u3058\u3060\u3002<\/p>\n
\n
\u4e8b\u4f8b1: Option<Vec<_>> \u306e\u4e2d\u8eab\u306e\u30d9\u30af\u30bf\u306b\u3064\u3044\u3066\u30eb\u30fc\u30d7\u3092\u56de\u3059<\/h1>\n
\u4f8b\u3068\u3057\u3066\u3001\u300c Option<Vec> \u304c Some \u3067\u3042\u308c\u3070\u3001\u4e2d\u306e\u30d9\u30af\u30bf\u306e\u6587\u5b57\u5217\u3092\u5927\u6587\u5b57\u306b\u3057\u3066\u8868\u793a\u3059\u308b\u300d\u3053\u3068\u3092\u8003\u3048\u308b\u3002<\/p>\n
let<\/span> optvec<\/span> =<\/span> Some<\/span>(<\/span>vec!<\/span>[<\/span>\"foo\"<\/span>.to_string<\/span>(),<\/span> 2<\/span>.to_string<\/span>(),<\/span> \"bar2baz\"<\/span>.to_string<\/span>()]);<\/span>\r\nif<\/span> let<\/span> Some<\/span>(<\/span>ref<\/span> vec<\/span>)<\/span> =<\/span> optvec<\/span> {<\/span>\r\n    for<\/span> i<\/span> in<\/span> vec<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"{:?} => {:?}\"<\/span>,<\/span> i<\/span>,<\/span> i<\/span>.to_uppercase<\/span>());<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Option\u306e\u4e2d\u8eab\u3092 if let \u3067\u53d6\u308a\u51fa\u3059\u3001\u307e\u3042\u666e\u901a\u306e\u30b3\u30fc\u30c9\u3002<\/p>\n
iterator\u3092\u4f7f\u3063\u305f\u30b3\u30fc\u30c9\u306f\u3053\u3046\u306a\u308b:<\/p>\n
let<\/span> optvec<\/span> =<\/span> Some<\/span>(<\/span>vec!<\/span>[<\/span>\"foo\"<\/span>.to_string<\/span>(),<\/span> 2<\/span>.to_string<\/span>(),<\/span> \"bar2baz\"<\/span>.to_string<\/span>()]);<\/span>\r\nfor<\/span> i<\/span> in<\/span> optvec<\/span>.iter<\/span>()<\/span>.flat_map<\/span>(|<\/span>v<\/span>|<\/span> v<\/span>.iter<\/span>())<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"{:?} => {:?}\"<\/span>,<\/span> i<\/span>,<\/span> i<\/span>.to_uppercase<\/span>());<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3079\u3064\u306b if let \u3084 match \u3092\u4f7f\u3063\u3066\u3082\u3044\u3044\u306e\u3060\u304c\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u3046\u307e\u304f\u4f7f\u3046\u3068\u30cd\u30b9\u30c8(\u3068\u3044\u3046\u304b\u30a4\u30f3\u30c7\u30f3\u30c8)\u3092\u6e1b\u3089\u305b\u308b\u306e\u3067\u3046\u308c\u3057\u3044\u3002<\/p>\n
\u3061\u306a\u307f\u306b\u3001 optvec \u3092move\u3057\u3066\u826f\u3044\u306e\u3067\u3042\u308c\u3070\u3001 into_iter \u3092\u4f7f\u3046\u65b9\u304c\u826f\u3044\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092consume\u3059\u308b\u3088\u3046\u306a\u95a2\u6570\u3082\u547c\u3079\u308b\u305f\u3081\u3060\u3002<\/p>\n
\/\/ \u6587\u5b57\u5217\u3092\u30d0\u30a4\u30c8\u5217\u306b\u3057\u3066\u8868\u793a<\/span>\r\nfor<\/span> i<\/span> in<\/span> optvec<\/span>.into_iter<\/span>()<\/span>.flat_map<\/span>(<\/span>Vec<\/span>::<\/span>into_iter<\/span>)<\/span> {<\/span>\r\n    \/\/ i\u306fmove\u3055\u308c\u3066\u304f\u308b\u306e\u3067\u3001 `String::into_bytes(self)` \u304c\u547c\u3079\u308b<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> i<\/span>.into_bytes<\/span>());<\/span>\r\n}<\/span> \/\/ \u307e\u3042\u3053\u306e\u5834\u5408map\u3092\u4f7f\u3063\u305f\u65b9\u304c\u3044\u3044\u3051\u3069\u306d<\/span>\r\n<\/code><\/pre>\n
\u89e3\u8aac<\/h2>\n
Option::iter(), Option::into_iter()<\/h3>\n
Option \u578b\u304c\u300c0\u500b\u304b1\u500b\u306e\u5024\u3092\u6301\u3064\u30b3\u30f3\u30c6\u30ca\u300d\u3068\u8003\u3048\u308c\u3070\u3001 Vec \u3084 HashMap \u7b49\u3068\u540c\u3058\u3088\u3046\u306b\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f7f\u3063\u305f\u308a\u30eb\u30fc\u30d7\u3092\u56de\u305b\u308b\u306e\u306f\u81ea\u7136\u3060\u3002
\n\u305d\u3093\u306a\u308f\u3051\u3067(\u304b\u3069\u3046\u304b\u306f\u77e5\u3089\u306a\u3044\u304c)\u3001 Option \u306f\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
for<\/span> i<\/span> in<\/span> Some<\/span>(<\/span>1<\/span>)<\/span> {<\/span> \/\/ for i in Some(1).into_iter() \u3068\u540c\u3058<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> i<\/span>);<\/span> \/\/ => 1<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
if let \u306f\u3042\u3089\u3086\u308b(?)\u578b\u306b\u3064\u3044\u3066destructure\u3067\u304d\u308b\u306e\u3067\u5f37\u3044\u304c\u3001 Option \u306b\u3064\u3044\u3066\u306f for in \u3092\u4f7f\u3046\u3068\u3044\u3046\u9078\u629e\u80a2\u3082\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3060\u3002
\n\u308f\u304b\u308a\u3084\u3059\u3044\u304b\u306f\u5225\u306b\u3057\u3066\u3002<\/p>\n
Vec::iter(), Vec::into_iter()<\/h3>\n
\u305d\u306e\u540d\u306e\u901a\u308a\u3001\u30d9\u30af\u30bf\u306e\u8981\u7d20\u3092\u5217\u6319\u3059\u308b\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f5c\u308b\u30e1\u30f3\u30d0\u95a2\u6570\u3002<\/p>\n
\u305d\u308c\u306f\u826f\u3044\u3068\u3057\u3066\u3001\u306a\u305c optvec.iter().flat_map(|v| v.iter()) \u3067 |v| v.iter() \u3092\u4f7f\u3063\u305f\u304b\u3002
\n\u3053\u3053\u3067\u306e v \u306f &Vec<_> \u3060\u304c\u3001\u5b9f\u306f Vec::iter \u306f\u5b58\u5728\u305b\u305a\u3001 v.iter() \u3057\u305f\u3068\u304d Deref<Target=[T]> \u3068\u3044\u3046\u30c8\u30ec\u30a4\u30c8\u306b\u3088\u308b\u53c2\u7167\u5916\u3057\u7d4c\u7531\u3067 slice::iter \u304c\u547c\u3070\u308c\u308b\u3053\u3068\u3067\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u53d6\u5f97\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3042\u308b\u3002
\n\u3088\u3063\u3066\u3001\u30e1\u30f3\u30d0\u95a2\u6570\u4e00\u767a\u3067 Vec<_> \u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u5f97\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u304b\u3089\u3001\u6697\u9ed9\u306ederef\u3092\u6709\u52b9\u6d3b\u7528\u3057\u3066 |v| v.iter() \u3068\u66f8\u304f\u306e\u304c\u4e00\u756a\u77ed\u304f\u306a\u308b\u306e\u3067\u3042\u308b\u3002<\/p>\n
Iterator::flat_map()<\/h3>\n
std::iter::Iterator – Rust \u2190\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8aad\u3081\u3070\u308f\u304b\u308b\u3002
\n\u7c21\u5358\u306b\u8a00\u3048\u3070\u3001
\n\u300c\u30a4\u30c6\u30ec\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u3001\u300e\u30e2\u30ce\u3092\u53d7\u3051\u53d6\u3063\u3066\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u8fd4\u3059\u95a2\u6570\u300f\u3092\u53d7\u3051\u53d6\u308a\u3001\u305d\u308c\u305e\u308c\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u7e4b\u3052\u3066\u8fd4\u3059\u300d\u3001
\n\u3064\u307e\u308a Iter -> (T -> Iter) -> Iter \u3068\u3044\u3046\u611f\u3058\u306e\u95a2\u6570\u3060\u3002(\u4f1d\u308f\u308c\uff01)<\/u><\/u><\/p>\n
\u4e8b\u4f8b2: Option \u306e\u4e2d\u8eab\u304c\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u306a\u304b\u3063\u305f\u3089 None \u306b\u3059\u308b<\/h1>\n
\u8ffd\u8a18 2017-11-15: Add Option::filter() according to RFC 2124 by LukasKalbertodt \u00b7 Pull Request #45863 \u00b7 rust-lang\/rust \u3068\u3044\u3046\u6a5f\u80fd\u304c\u5165\u3063\u305f\u306e\u3067\u3001 Rust-1.22 \u304b\u3089\u306f\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f7f\u308f\u305a\u3068\u3082\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n
let<\/span> optint<\/span> =<\/span> Some<\/span>(<\/span>3<\/span>);<\/span>\r\nlet<\/span> positive<\/span> =<\/span> optint<\/span>.filter<\/span>(|<\/span>&<\/span>v<\/span>|<\/span> v<\/span> >=<\/span> 0<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"positive: {:?}\"<\/span>,<\/span> positive<\/span>);<\/span> \/\/ => 3<\/span>\r\n<\/code><\/pre>\n
\u8ffd\u8a182 2017-12-05: Tracking issue for Option::filter (feature option_filter) \u00b7 Issue #45860 \u00b7 rust-lang\/rust
\nUnstable \u3067\u3057\u305f\u2026\u2026<\/p>\n
\u8ffd\u8a183 2018-06-22: Option::filter \u306f rust 1.27 \u3067\u5b89\u5b9a\u5316\u3055\u308c\u307e\u3057\u305f?<\/p>\n
\n
\u4f8b\u3068\u3057\u3066\u3001\u300c Option \u306e\u4e2d\u8eab\u304c\u8ca0\u3067\u3042\u308c\u3070 None \u306b\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u305d\u306e\u307e\u307e\u306b\u3059\u308b\u300d\u3053\u3068\u3092\u8003\u3048\u308b\u3002<\/p>\n
let<\/span> optint<\/span> =<\/span> Some<\/span>(<\/span>3<\/span>);<\/span>\r\nlet<\/span> positive<\/span> =<\/span> if<\/span> let<\/span> Some<\/span>(<\/span>i<\/span>)<\/span> =<\/span> optint<\/span> {<\/span>\r\n    if<\/span> i<\/span> >=<\/span> 0<\/span> {<\/span>\r\n        Some<\/span>(<\/span>i<\/span>)<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        None<\/span>\r\n    }<\/span>\r\n}<\/span> else<\/span> {<\/span>\r\n    None<\/span>\r\n};<\/span>\r\nprintln!<\/span>(<\/span>\"positive: {:?}\"<\/span>,<\/span> positive<\/span>);<\/span> \/\/ => 3<\/span>\r\n<\/code><\/pre>\n
Some \u306a\u3089\uff5b\u975e\u8ca0\u306a\u3089 Some \u3001\u305d\u308c\u4ee5\u5916\u306a\u3089 None \uff5d\u3001\u305d\u308c\u4ee5\u5916\u306a\u3089 None
\n\u3068\u3044\u3046\u611f\u3058\u3002\u30cd\u30b9\u30c8\u304c\u91cd\u306a\u3063\u3066\u6c5a\u3044\u3046\u3048\u3001Some \u3092\u5265\u304c\u3057\u3066\u307e\u305f\u5305\u3080\u3068\u3044\u3046\u3001\u306a\u3093\u3068\u3082\u7f8e\u3057\u304f\u306a\u3044\u30b3\u30fc\u30c9\u3060\u3002<\/p>\n
let<\/span> optint<\/span> =<\/span> Some<\/span>(<\/span>3<\/span>);<\/span>\r\nlet<\/span> positive<\/span> =<\/span> optint<\/span>.and_then<\/span>(|<\/span>i<\/span>|<\/span> if<\/span> i<\/span> >=<\/span> 0<\/span> {<\/span> Some<\/span>(<\/span>i<\/span>)<\/span> }<\/span> else<\/span> {<\/span> None<\/span> });<\/span>\r\nprintln!<\/span>(<\/span>\"positive: {:?}\"<\/span>,<\/span> positive<\/span>);<\/span> \/\/ => 3<\/span>\r\n<\/code><\/pre>\n
Option::and_then() \u3092\u4f7f\u3063\u3066\u3001\u4e00\u884c\u306b\u307e\u3068\u3081\u305f\u3002
\nC\u30b9\u30bf\u30a4\u30eb\u306e\u4e09\u9805\u6f14\u7b97\u5b50\u304c\u3042\u308c\u3070\u30de\u30b7\u306b\u306a\u308b\u306e\u3060\u304c\u3001\u6b8b\u5ff5\u306a\u304c\u3089Rust\u3067\u306f if \u304c\u5f0f\u3068\u3057\u3066\u4f7f\u3048\u308b\u305f\u3081\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u7528\u610f\u3055\u308c\u3066\u3044\u306a\u3044\u3002
\n(\u53c2\u8003 (\u3055\u3093\u3053\u3046\u3060\u3051\u306b): Remove ternary operator \u00b7 Issue #1698 \u00b7 rust-lang\/rust)
\n\u3061\u306a\u307f\u306b\u3001if\u306e\u4e2d\u62ec\u5f27\u306f\u7701\u7565\u3067\u304d\u306a\u3044\u3002<\/p>\n
\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u6d3b\u7528\u3057\u305f\u30b3\u30fc\u30c9:<\/p>\n
let<\/span> optint<\/span> =<\/span> Some<\/span>(<\/span>3<\/span>);<\/span>\r\nlet<\/span> positive<\/span> =<\/span> optint<\/span>.into_iter<\/span>()<\/span>.find<\/span>(|<\/span>&<\/span>v<\/span>|<\/span> v<\/span> >=<\/span> 0<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"positive: {:?}\"<\/span>,<\/span> positive<\/span>);<\/span> \/\/ => 3<\/span>\r\n<\/code><\/pre>\n
\u77ed\u3044\u3002\u5358\u7d14\u3055\u306f\u6b63\u7fa9\u3060\u3002
\n\u305d\u3057\u3066\u3001\u300c\u5265\u304c\u3057\u3066\u5305\u3080\u300d\u3068\u3044\u3046\u7121\u99c4\u306b\u898b\u3048\u308b\u64cd\u4f5c\u3092\u66f8\u304b\u305a\u306b\u6e08\u3080\u3088\u3046\u306b\u306a\u3063\u305f\u3002<\/p>\n
\u89e3\u8aac<\/h2>\n
Iterator::find()<\/h3>\n
std::iter::Iterator – Rust
\n\u540d\u524d\u304b\u3089\u60f3\u50cf\u3055\u308c\u308b\u901a\u308a\u3001\u300c\u4e0e\u3048\u3089\u308c\u305f\u6761\u4ef6\u3092\u6700\u521d\u306b\u6e80\u305f\u3057\u305f\u8981\u7d20\u3092\u8fd4\u3059(Some)\u3001\u3082\u3057\u3072\u3068\u3064\u3082\u306a\u3051\u308c\u3070 None \u300d\u3068\u3044\u3046\u95a2\u6570\u3060\u3002
\n\u3053\u308c\u3092 Option \u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u306b\u4f7f\u3048\u3070\u3001 None \u306e\u5834\u5408\u306f\u8981\u7d20\u304c\u7121\u3044\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u306e\u3067 find \u3082 None \u3092\u8fd4\u3057\u3001 Some \u3067\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u5834\u5408\u3082 None \u3092\u8fd4\u3057\u3001 Some \u3067\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308c\u3070\u305d\u308c\u3092 Some \u3067\u8fd4\u3059\u3001\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u3002<\/p>\n
Iterator::and_then()<\/h3>\n
std::option::Option – Rust
\nHaskell\u98a8\u306b\u66f8\u304f\u3068 Option -> (T -> Option) -> Option \u3067\u3042\u308b\u3002
\n\u3068\u3044\u3046\u304b\u3001\u307e\u3055\u3057\u304fHaskell\u3067\u8a00\u3046\u3068\u3053\u308d\u306e (>>=) \u3060\u3002
\n\u3061\u306a\u307f\u306b\u3001\u3053\u3044\u3064\u306f Option \u3060\u3051\u3067\u306a\u304f\u3001 Result \u306b\u3082\u7528\u610f\u3055\u308c\u3066\u3044\u308b (std::result::Result – Rust)\u3002<\/u><\/u><\/p>\n
\u4e8b\u4f8b3: Option \u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u3067\u3001\u6700\u521d\u306e None \u306e\u76f4\u524d\u307e\u3067\u3092unwrap\u3057\u305f\u3082\u306e\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u5f97\u308b\u3002 None \u4ee5\u964d\u306f\u6368\u3066\u308b<\/h1>\n
\u8981\u3059\u308b\u306b\u3001 take_while() \u3068 filter_map() (\u6216\u3044\u306f unwrap())\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u3088\u3046\u306a\u3053\u3068\u3092\u3057\u305f\u3044\u5834\u5408\u3002<\/p>\n
let<\/span> vec<\/span> =<\/span> vec!<\/span>[<\/span>\"1\"<\/span>,<\/span> \"2\"<\/span>,<\/span> \"3\"<\/span>,<\/span> \"lol\"<\/span>,<\/span> \"5\"<\/span>];<\/span>\r\nfor<\/span> num<\/span> in<\/span> vec<\/span>.into_iter<\/span>()<\/span>.map<\/span>(|<\/span>v<\/span>|<\/span> v<\/span>.parse<\/span>::<\/span><<\/span>i32<\/span>><\/span>()<\/span>.ok<\/span>())<\/span>.take_while<\/span>(|<\/span>v<\/span>|<\/span> v<\/span>.is_some<\/span>())<\/span>.map<\/span>(|<\/span>v<\/span>|<\/span> v<\/span>.unwrap<\/span>())<\/span> {<\/span>\r\n    print!<\/span>(<\/span>\"{},\"<\/span>,<\/span> num<\/span>);<\/span>\r\n}<\/span>\r\n\/\/ \u51fa\u529b: 1,2,3,<\/span>\r\n<\/code><\/pre>\n
let<\/span> vec<\/span> =<\/span> vec!<\/span>[<\/span>\"1\"<\/span>,<\/span> \"2\"<\/span>,<\/span> \"3\"<\/span>,<\/span> \"lol\"<\/span>,<\/span> \"5\"<\/span>];<\/span>\r\nfor<\/span> num<\/span> in<\/span> vec<\/span>.into_iter<\/span>()<\/span>.map<\/span>(|<\/span>v<\/span>|<\/span> v<\/span>.parse<\/span>::<\/span><<\/span>i32<\/span>><\/span>()<\/span>.ok<\/span>())<\/span>.take_while<\/span>(|<\/span>v<\/span>|<\/span> v<\/span>.is_some<\/span>())<\/span>.filter_map<\/span>(|<\/span>v<\/span>|<\/span> v<\/span>)<\/span> {<\/span>\r\n    print!<\/span>(<\/span>\"{},\"<\/span>,<\/span> num<\/span>);<\/span>\r\n}<\/span>\r\n\/\/ \u51fa\u529b: 1,2,3,<\/span>\r\n<\/code><\/pre>\n
\u7f8e\u3057\u304f\u306a\u3044\u306a\u3041\u3002<\/p>\n
\u3053\u306e\u30b3\u30fc\u30c9\u306e\u6839\u672c\u7684\u306a\u554f\u984c\u306f\u3001 \u4e00\u5ea6 is_some() \u3067\u578b(variant)\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304a\u304d\u306a\u304c\u3089\u3001\u3082\u3046\u4e00\u5ea6 unwrap() \u3084 filter_map() \u3067\u5168\u304f\u540c\u3058\u78ba\u8a8d\u304c\u3055\u308c\u308b \u3068\u3044\u3046\u3068\u3053\u308d\u306b\u3042\u308b\u3002
\nunwrap() \u3060\u3063\u3066\u3001panic\u3059\u308b\u304b\u5024\u3092\u8fd4\u3059\u304b\u9078\u3076\u305f\u3081\u306b\u3001\u3061\u3083\u3093\u3068\u578b\u3092\u78ba\u8a8d\u3057\u3066\u3044\u308b\u306e\u3060\u3002
\n\u3053\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3092\u306a\u304f\u3059\u305f\u3081\u306b\u306f\u3001 Some \u3067\u3042\u308b\u3053\u3068\u306e\u78ba\u8a8d\u3068\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u5207\u308b\u306e\u3092\u3001\u540c\u6642\u306b\u884c\u308f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/p>\n
\u305d\u3093\u306a\u90fd\u5408\u306e\u826f\u3044\u30e1\u30bd\u30c3\u30c9\u304c\u3001\u5b9f\u306f\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u306e\u3060\u3002
\n(\u601d\u3044\u4ed8\u304b\u306a\u3044\u65b9\u306f\u3001\u624b\u524d\u5473\u564c\u3060\u304cRust\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u7db2\u7f85\u7684\u304b\u3064\u5927\u96d1\u628a\u306a\u7d39\u4ecb – Qiita\u3084\u3001std::iter::Iterator – Rust\u3092\u8aad\u3093\u3067\u307f\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3059\u308b\u3002)<\/p>\n
Iterator::scan() \u3067\u3042\u308b\u3002
\n\u3053\u3044\u3064\u306f\u3001Iterator::fold()\u306e\u9014\u4e2d\u7d4c\u904e\u3092\u898b\u3048\u308b\u3088\u3046\u306b\u3057\u305f\u3088\u3046\u306a\u3082\u306e\u3060\u304c\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u8fd4\u3059\u5024\u3068\u3057\u3066 Option \u3092\u8fd4\u3059\u3053\u3068\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u3053\u308c\u3092\u5229\u7528\u3059\u308b\u3002<\/p>\n
let<\/span> vec<\/span> =<\/span> vec!<\/span>[<\/span>\"1\"<\/span>,<\/span> \"2\"<\/span>,<\/span> \"3\"<\/span>,<\/span> \"lol\"<\/span>,<\/span> \"5\"<\/span>];<\/span>\r\nfor<\/span> num<\/span> in<\/span> vec<\/span>.into_iter<\/span>()<\/span>.scan<\/span>((),<\/span> |<\/span>_<\/span>,<\/span> v<\/span>|<\/span> v<\/span>.parse<\/span>::<\/span><<\/span>i32<\/span>><\/span>()<\/span>.ok<\/span>())<\/span> {<\/span>\r\n    print!<\/span>(<\/span>\"{},\"<\/span>,<\/span> num<\/span>);<\/span>\r\n}<\/span>\r\n\/\/ \u51fa\u529b: 1,2,3,<\/span>\r\n<\/code><\/pre>\n
\u89e3\u8aac<\/h2>\n
\u3060\u3044\u305f\u3044\u898b\u308c\u3070\u308f\u304b\u308b\u304c\u3002
\nIterator::scan() \u306e\u7b2c1\u5f15\u6570(\u3053\u306e\u4f7f\u3044\u65b9\u3067\u306f ())\u306f\u3001\u72b6\u614b\u3067\u3042\u308b\u3002
\n\u4eca\u56de\u306f\u72b6\u614b\u306f\u4e0d\u8981\u306a\u306e\u3067 () \u3092\u6e21\u305d\u3046\u3002\u305f\u3076\u3093\u6700\u9069\u5316\u304c\u304d\u304f\u3002(\u672c\u5f53\u304b\u306a\uff1f)<\/p>\n
\u7b2c2\u5f15\u6570\u306f &mut State -> T -> Option \u306e\u3088\u3046\u306a\u95a2\u6570\u3060\u3002
\n&mut State \u306f\u72b6\u614b\u3002\u4eca\u56de\u306f\u4f7f\u308f\u306a\u3044\u306e\u3067 _ \u3067\u53d7\u3051\u308b\u3002
\nT \u306f\u5143\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u8981\u7d20\u306e\u578b\u3001\u3053\u3053\u3067\u306f\u6587\u5b57\u5217(&str)\u3060\u3002\u3053\u308c\u3092 v \u3067\u53d7\u3051\u308b\u3002
\n\u95a2\u6570\u306e\u623b\u308a\u5024 Option \u306e U \u306f\u3001\u65b0\u3057\u3044\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u8981\u7d20\u306e\u578b\u3067\u3042\u308b\u3002
\n\u4eca\u56de\u306f\u30d1\u30fc\u30b9\u5f8c\u306e i32 \u304c\u6b32\u3057\u3044\u306e\u3067\u3001 Option \u3092\u8fd4\u3059\u3002
\n\u305f\u3060\u3057 parse() \u306f Result \u3092\u8fd4\u3059\u306e\u3067\u3001 Result::ok() \u3067 Option \u306b\u5909\u63db\u3059\u308b\u3002<\/u><\/u><\/p>\n
fold \u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/h2>\n
\u3082\u3057 Ok(_) \u306e\u5024\u3092 fold() \u3078\u6d41\u305d\u3046\u3068\u3057\u3066\u3044\u308b\u306e\u3067\u3042\u308c\u3070\u3001 scan() \u3092\u7d4c\u7531\u305b\u305a\u3001 rust 1.27 \u3067\u5b89\u5b9a\u5316\u3055\u308c\u305f Iterator::try_fold() \u3092\u76f4\u63a5\u4f7f\u3046\u3079\u304d\u3067\u3042\u308b\u3002<\/p>\n
\u4e8b\u4f8b3: write!() \u7b49\u3067\u30b3\u30f3\u30de\u533a\u5207\u308a\u306e\u30ea\u30b9\u30c8\u3092\u8868\u793a\u3059\u308b(\u305f\u3060\u3057\u30b1\u30c4\u30ab\u30f3\u30de\u306f\u8a8d\u3081\u306a\u3044)<\/h1>\n
\u591a\u5c11\u30b3\u30fc\u30c9\u306f\u5909\u5316\u3059\u308b\u304c\u3001\u57fa\u672c\u7684\u306b io::Write \u3067\u3082 fmt::Formatter \u3067\u3082\u4f7f\u3048\u308b\u3002<\/p>\n
list<\/span>.iter<\/span>()<\/span>.try_fold<\/span>(<\/span>\"\"<\/span>,<\/span> |<\/span>sep<\/span>,<\/span> arg<\/span>|<\/span> {<\/span>\r\n    write!<\/span>(<\/span>f<\/span>,<\/span> \"{}{}\"<\/span>,<\/span> sep<\/span>,<\/span> arg<\/span>)<\/span>.map<\/span>(|<\/span>_<\/span>|<\/span> \", \"<\/span>)<\/span>\r\n})<\/span>?<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5b9f\u969b\u305d\u308c\u3063\u307d\u3044\u611f\u3058\u3067\u4f7f\u3046\u3068\u3001\u3053\u3093\u306a\u611f\u3058 (playground) \u306b\u306a\u308b\u3002<\/p>\n
\u6216\u3044\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u6c4e\u7528\u7684\u306a\u95a2\u6570\u3092\u4f5c\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002<\/p>\n
use<\/span> std<\/span>::<\/span>fmt<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\n\r\nfn<\/span> write_with_sep<\/span><<\/span>W<\/span>,<\/span> T<\/span>,<\/span> I<\/span>><\/span>(<\/span>mut<\/span> w<\/span>:<\/span> W<\/span>,<\/span> iter<\/span>:<\/span> I<\/span>,<\/span> sep<\/span>:<\/span> &<\/span>str<\/span>)<\/span> -><\/span> io<\/span>::<\/span>Result<\/span><<\/span>()<\/span>><\/span>\r\nwhere<\/span>\r\n    W<\/span>:<\/span> io<\/span>::<\/span>Write<\/span>,<\/span>\r\n    T<\/span>:<\/span> fmt<\/span>::<\/span>Display<\/span>,<\/span>\r\n    I<\/span>:<\/span> IntoIterator<\/span><<\/span>Item<\/span> =<\/span> T<\/span>><\/span>,<\/span>\r\n{<\/span>\r\n    iter<\/span>.into_iter<\/span>()<\/span>.try_fold<\/span>(<\/span>\"\"<\/span>,<\/span> |<\/span>s<\/span>,<\/span> item<\/span>|<\/span> {<\/span>\r\n        w<\/span>.write_fmt<\/span>(<\/span>format_args!<\/span>(<\/span>\"{}{}\"<\/span>,<\/span> s<\/span>,<\/span> item<\/span>))<\/span>?<\/span>;<\/span>\r\n        Ok<\/span>(<\/span>sep<\/span>)<\/span>\r\n    })<\/span>.map<\/span>(|<\/span>_<\/span>|<\/span> ())<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> src<\/span> =<\/span> vec!<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 4<\/span>,<\/span> 8<\/span>,<\/span> 16<\/span>];<\/span>\r\n    write_with_sep<\/span>(<\/span>io<\/span>::<\/span>stdout<\/span>(),<\/span> src<\/span>,<\/span> \" => \"<\/span>)<\/span>.expect<\/span>(<\/span>\"Write failed\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
(playground)<\/p>\n
\u8003\u3048\u65b9<\/h2>\n
\u4ed5\u639b\u3051\u3068\u3057\u3066\u306f\u5358\u7d14\u3067\u3001 try_fold \u306f\u57fa\u672c\u7684\u306b fold \u3068\u540c\u3058\u3067\u300c\u524d\u306e\u8981\u7d20\u3092\u51e6\u7406\u3057\u305f\u7d50\u679c\u3092\u6b21\u306e\u8981\u7d20\u306e\u51e6\u7406\u3078\u6e21\u3059\u300d\u3068\u3044\u3046\u5f79\u5272\u3092\u6301\u3063\u3066\u3044\u308b\u3002
\n\u305d\u3053\u3067\u3001\u3053\u308c\u3092\u300c\u51e6\u7406\u306e\u7d50\u679c\u300d\u3067\u3042\u308b\u51fa\u529b\u6210\u529f\/\u5931\u6557\u306e\u4f1d\u9054\u3068\u3001\u300c\u533a\u5207\u308a\u304c\u5fc5\u8981\u304b\u5426\u304b\u300d\u306e\u4f1d\u9054\u306e\u4e21\u65b9\u306b\u540c\u6642\u306b\u4f7f\u3063\u3066\u3084\u308d\u3046\u3068\u3044\u3046\u767a\u60f3\u3067\u3042\u308b\u3002<\/p>\n
let<\/span> mut<\/span> needs_leading_comma<\/span> =<\/span> false<\/span>;<\/span>\r\nfor<\/span> item<\/span> in<\/span> iter<\/span> {<\/span>\r\n    if<\/span> needs_leading_comma<\/span> {<\/span>\r\n        w<\/span>.write_fmt<\/span>(<\/span>format_args!<\/span>(<\/span>\"{}\"<\/span>,<\/span> sep<\/span>))<\/span>?<\/span>;<\/span>\r\n    }<\/span>\r\n    write!<\/span>(<\/span>w<\/span>,<\/span> \"{}\"<\/span>,<\/span> item<\/span>)<\/span>?<\/span>;<\/span>\r\n    needs_leading_comma<\/span> =<\/span> true<\/span>;<\/span>\r\n}<\/span>\r\nOk<\/span>(())<\/span>\r\n<\/code><\/pre>\n
if \u3067\u300c\u4f55\u3082\u8868\u793a\u3057\u306a\u3044\u300d\u30b3\u30fc\u30c9\u3068\u5206\u5c90\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001\u300c\u7a7a\u6587\u5b57\u5217\u3092\u8868\u793a\u3059\u308b\u300d\u30b3\u30fc\u30c9\u306b\u3059\u308b\u3053\u3068\u3067\u5206\u5c90\u3092\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
let<\/span> mut<\/span> leading_sep<\/span> =<\/span> \"\"<\/span>;<\/span>\r\nfor<\/span> item<\/span> in<\/span> iter<\/span> {<\/span>\r\n    write!<\/span>(<\/span>w<\/span>,<\/span> \"{}{}\"<\/span>,<\/span> leading_sep<\/span>,<\/span> item<\/span>)<\/span>?<\/span>;<\/span>\r\n    leading_sep<\/span> =<\/span> sep<\/span>;<\/span>\r\n}<\/span>\r\nOk<\/span>(())<\/span>\r\n<\/code><\/pre>\n
\u3053\u3053\u3067\u3001\u30eb\u30fc\u30d7\u4e2d\u3067\u4f1d\u9054\u3055\u308c\u308b\u3079\u304d\u300c\u72b6\u614b\u300d\u306f leading_sep \u3001\u521d\u671f\u5024\u306f “” \u3067\u3042\u308b\u3002
\ntry_fold \u3067\u4f7f\u3046\u305f\u3081\u306b\u3001 leading_sep \u306b sep \u3092\u4ee3\u5165\u3059\u308b\u4ee3\u308f\u308a\u306b Ok(sep) \u3092\u8fd4\u3059\u3002<\/p>\n
iter<\/span>.into_iter<\/span>()<\/span>.try_fold<\/span>(<\/span>\"\"<\/span>,<\/span> |<\/span>leading_sep<\/span>,<\/span> item<\/span>|<\/span> {<\/span>\r\n    write!<\/span>(<\/span>w<\/span>,<\/span> \"{}{}\"<\/span>,<\/span> leading_sep<\/span>,<\/span> item<\/span>)<\/span>?<\/span>;<\/span>\r\n    Ok<\/span>(<\/span>sep<\/span>)<\/span>\r\n})<\/span>?<\/span>;<\/span>\r\nOk<\/span>(())<\/span>\r\n<\/code><\/pre>\n
\u306f\u3044\u3002
\n\u304a\u597d\u307f\u3067 .map(|_| ()) \u3082\u3069\u3046\u305e\u3002<\/p>\n
\u4e8b\u4f8b4: take_while \u3067\u8aad\u307f\u6368\u3066\u3089\u308c\u308b\u6700\u5f8c\u306e\u5024\u3092\u62fe\u3046<\/h2>\n
let<\/span> a<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>];<\/span>\r\nlet<\/span> mut<\/span> iter<\/span> =<\/span> a<\/span>.into_iter<\/span>();<\/span>\r\n\r\nlet<\/span> result<\/span>:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> iter<\/span>\r\n    .by_ref<\/span>()<\/span>\r\n    .take_while<\/span>(|<\/span>n<\/span>|<\/span> **<\/span>n<\/span> !=<\/span> 3<\/span>)<\/span>\r\n    .cloned<\/span>()<\/span>\r\n    .collect<\/span>();<\/span>\r\n\r\nassert_eq!<\/span>(<\/span>result<\/span>,<\/span> &<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>]);<\/span>\r\n\r\nlet<\/span> result<\/span>:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> iter<\/span>.cloned<\/span>()<\/span>.collect<\/span>();<\/span>\r\n\r\nassert_eq!<\/span>(<\/span>result<\/span>,<\/span> &<\/span>[<\/span>4<\/span>]);<\/span>\r\n<\/code><\/pre>\n
playground, \u516c\u5f0f\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9 \u306e\u4f8b\u3088\u308a<\/p>\n
\u3053\u306e\u4f8b\u304b\u3089\u308f\u304b\u308b\u3088\u3046\u306b\u30013\u306f\u8aad\u307f\u6368\u3066\u3089\u308c\u3066\u3057\u307e\u3046\u3002
\n\u3053\u308c\u3092\u62fe\u3044\u305f\u3044\u5834\u5408\u306b\u3069\u3046\u3059\u308b\u304b\u3002<\/p>\n
inspect \u3092\u4f7f\u3046\u3002<\/p>\n
let<\/span> a<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>];<\/span>\r\nlet<\/span> mut<\/span> iter<\/span> =<\/span> a<\/span>.into_iter<\/span>();<\/span>\r\n\r\nlet<\/span> mut<\/span> last_read<\/span> =<\/span> None<\/span>;<\/span> \/\/ <- Keep the last value<\/span>\r\nlet<\/span> result<\/span>:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> iter<\/span>\r\n    .by_ref<\/span>()<\/span>\r\n    .inspect<\/span>(|<\/span>n<\/span>|<\/span> last_read<\/span> =<\/span> Some<\/span>(<\/span>**<\/span>n<\/span>))<\/span> \/\/ <- Store the last value<\/span>\r\n    .take_while<\/span>(|<\/span>n<\/span>|<\/span> **<\/span>n<\/span> !=<\/span> 3<\/span>)<\/span>\r\n    .cloned<\/span>()<\/span>\r\n    .collect<\/span>();<\/span>\r\n\r\nassert_eq!<\/span>(<\/span>result<\/span>,<\/span> &<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>]);<\/span>\r\nassert_eq!<\/span>(<\/span>last_loaded<\/span>,<\/span> Some<\/span>(<\/span>3<\/span>));<\/span> \/\/ Here you are<\/span>\r\n\r\nlet<\/span> result<\/span>:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> iter<\/span>.cloned<\/span>()<\/span>.collect<\/span>();<\/span>\r\n\r\nassert_eq!<\/span>(<\/span>result<\/span>,<\/span> &<\/span>[<\/span>4<\/span>]);<\/span>\r\n<\/code><\/pre>\n
playground<\/p>\n
\u89e3\u8aac<\/h3>\n
\u672c\u6765 inspect \u306f\u3001\u305d\u306e\u540d\u306e\u901a\u308a\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u6d41\u308c\u308b\u8981\u7d20\u3092\u691c\u67fb\u3059\u308b (\u7279\u306b\u30c7\u30d0\u30c3\u30b0\u76ee\u7684\u306a\u3069\u3067\u30ed\u30b0\u3092\u5410\u304f) \u305f\u3081\u306b\u4f7f\u308f\u308c\u308b\u3002
\n\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3082\u305d\u3046\u3044\u3063\u305f\u7528\u9014\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u3002<\/p>\n
\u3053\u306e\u95a2\u6570\u306f\u300c\u8981\u7d20\u306e\u53c2\u7167\u3092\u53d7\u3051\u53d6\u3063\u3066 () \u3092\u8fd4\u3059\u300d\u3082\u306e\u3067\u3042\u308a\u3001\u526f\u4f5c\u7528\u3092\u524d\u63d0\u306b\u4f5c\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u5b9f\u969b\u306b\u306f\u8868\u793a\u4ee5\u5916\u3067\u3082\u3001\u5024\u3092\u30a4\u30c6\u30ec\u30fc\u30bf\u306b\u6d41\u3059\u3088\u3046\u306a\u3053\u3068\u3067\u306a\u3051\u308c\u3070\u307b\u307c\u4f55\u3067\u3082\u3067\u304d\u308b\u3002
\n\u305d\u3053\u3067\u3001\u3053\u308c\u3092\u30ed\u30b0\u51fa\u529b\u3067\u306f\u306a\u304f\u300c\u6d41\u308c\u3066\u304d\u305f\u5024\u3092\u8907\u88fd\u3057\u3066\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u5916\u306b\u7528\u610f\u3055\u308c\u305f\u5909\u6570\u306b\u4fdd\u5b58\u3059\u308b\u300d\u3068\u3044\u3046\u76ee\u7684\u306b\u5229\u7528\u3057\u3066\u3044\u308b\u306e\u304c\u3001\u4e0a\u306e\u30b3\u30fc\u30c9\u3067\u3042\u308b\u3002<\/p>\n
\u52ff\u8ad6\u7121\u99c4\u306a\u30b3\u30d4\u30fc\u306f\u767a\u751f\u3057\u3066\u3057\u307e\u3046\u304c\u3001\u305d\u308c\u304c\u6c17\u306b\u306a\u308b\u3088\u3046\u3067\u3042\u308c\u3070\u3001\u6700\u521d\u304b\u3089\u3082\u3063\u3068\u52b9\u7387\u306e\u826f\u3044\u30a2\u30c0\u30d7\u30bf\u3092\u81ea\u5206\u3067\u66f8\u304f\u306a\u308a crate \u3092\u63a2\u3059\u306a\u308a\u30eb\u30fc\u30d7\u3092\u4f7f\u3046\u306a\u308a\u3059\u308b\u3079\u304d\u3067\u3042\u308b\u3002<\/p>\n
\n
\u307e\u3068\u3081<\/h1>\n
    \n
  • \n
      \u30a4\u30c6\u30ec\u30fc\u30bf\u306f for \u30eb\u30fc\u30d7\u3067\u4f7f\u3048\u308b<\/ul>\n<\/li>\n<\/ul>\n
      Option \u306f\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f5c\u308c\u308b<\/p>\n
      Iterator \u306e\u95a2\u6570\u3092\u6d3b\u7528\u3059\u308b\u3068\u3001\u5217\u6319\u3055\u308c\u308b\u3082\u306e\u306e\u4e2d\u8eab\u3092\u5f04\u308c\u308b<\/p>\n
      \u306e\u3067\u3001\u30cd\u30b9\u30c8\u3068\u304b\u3092\u6e1b\u3089\u305b\u308b\u3053\u3068\u304c\u3042\u308b
      \n\u300c\u306f\u304c\u3059\u300d\u300c\u306f\u304c\u3055\u305a\u5909\u5316\u3055\u305b\u308b\u300d\u306e\u3088\u3046\u306a\u64cd\u4f5c\u306f\u3001\u3069\u3046\u306b\u304b\u3057\u3066\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f7f\u3048\u308b\u3068\u8003\u3048\u308b\u3079\u3057<\/p>\n
      \u4ee5\u4e0b\u306e\u30da\u30fc\u30b8\u306f\u4e00\u5ea6\u5168\u4f53\u3092\u8aad\u3093\u3067\u304a\u304f\u3068\u69d8\u3005\u306a\u5834\u9762\u3067\u6d3b\u7528\u3067\u304d\u308b\u306e\u3067\u3001\u5168\u90e8\u306e\u95a2\u6570\u3092\u773a\u3081\u3066\u304a\u304f\u3068\u3001\u3044\u3056\u3068\u3044\u3046\u3068\u304d\u300c\u3053\u3093\u306a\u95a2\u6570\u3042\u3063\u305f\u3088\u306a\u2026\u2026\u300d\u3068\u601d\u3044\u51fa\u305b\u308b<\/p>\n
      std::iter::Iterator – Rust
      \nstd::option::Option – Rust
      \nstd::result::Result – Rust<\/p>\n
      \u4f55\u304b\u826f\u3044\u4f8b\u3084\u66f8\u304d\u65b9\u3001\u300c\u3053\u3093\u306a\u30af\u30bd\u306a\u66f8\u304d\u65b9\u3057\u306d\u30fc\u3088\uff01\u300d\u7b49\u3001\u3054\u610f\u898b\u304c\u3042\u308c\u3070\u662f\u975e\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u74b0\u5883 Rust 1.6.0\u3092\u524d\u63d0\u306b\u3002 \u3068\u306f\u3044\u3048\u3001\u591a\u5c11\u53e4\u304f\u3066\u3082\u554f\u984c\u306a\u3044\u306f\u305a\u3002 \u524d\u63d0 for i in x { f […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45793","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u74b0\u5883 Rust 1.6.0\u3092\u524d\u63d0\u306b\u3002 \u3068\u306f\u3044\u3048\u3001\u591a\u5c11\u53e4\u304f\u3066\u3082\u554f\u984c\u306a\u3044\u306f\u305a\u3002 \u524d\u63d0 for i in x { f […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-08-29T09:39:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-03T17:52:23+00:00\" \/>\n<meta name=\"author\" content=\"\u65b0, \u97f5\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u65b0, \u97f5\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/\",\"name\":\"- Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#website\"},\"datePublished\":\"2023-08-29T09:39:03+00:00\",\"dateModified\":\"2024-05-03T17:52:23+00:00\",\"author\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/4ba4019495123db3038fd0809e6959c9\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/\"]}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#website\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/\",\"name\":\"Blog - Silicon Cloud\",\"description\":\"\",\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/4ba4019495123db3038fd0809e6959c9\",\"name\":\"\u65b0, \u97f5\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/d484b6c6e4ae82e8a9efea989e1d2af46d9b6ef128101e63b18f559fca0ae627?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/d484b6c6e4ae82e8a9efea989e1d2af46d9b6ef128101e63b18f559fca0ae627?s=96&d=mm&r=g\",\"caption\":\"\u65b0, \u97f5\"},\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/author\/yunxin\/\"},{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/#local-main-organization-logo\",\"url\":\"\",\"contentUrl\":\"\",\"caption\":\"Blog - Silicon Cloud\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"- Blog - Silicon Cloud","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/","og_locale":"zh_CN","og_type":"article","og_description":"\u74b0\u5883 Rust 1.6.0\u3092\u524d\u63d0\u306b\u3002 \u3068\u306f\u3044\u3048\u3001\u591a\u5c11\u53e4\u304f\u3066\u3082\u554f\u984c\u306a\u3044\u306f\u305a\u3002 \u524d\u63d0 for i in x { f […]","og_url":"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/","og_site_name":"Blog - Silicon Cloud","article_published_time":"2023-08-29T09:39:03+00:00","article_modified_time":"2024-05-03T17:52:23+00:00","author":"\u65b0, \u97f5","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"\u65b0, \u97f5","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"4 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/","url":"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/","name":"- Blog - Silicon Cloud","isPartOf":{"@id":"https:\/\/www.silicloud.com\/zh\/blog\/#website"},"datePublished":"2023-08-29T09:39:03+00:00","dateModified":"2024-05-03T17:52:23+00:00","author":{"@id":"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/4ba4019495123db3038fd0809e6959c9"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/"]}]},{"@type":"WebSite","@id":"https:\/\/www.silicloud.com\/zh\/blog\/#website","url":"https:\/\/www.silicloud.com\/zh\/blog\/","name":"Blog - Silicon Cloud","description":"","inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/4ba4019495123db3038fd0809e6959c9","name":"\u65b0, \u97f5","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/d484b6c6e4ae82e8a9efea989e1d2af46d9b6ef128101e63b18f559fca0ae627?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d484b6c6e4ae82e8a9efea989e1d2af46d9b6ef128101e63b18f559fca0ae627?s=96&d=mm&r=g","caption":"\u65b0, \u97f5"},"url":"https:\/\/www.silicloud.com\/zh\/blog\/author\/yunxin\/"},{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.silicloud.com\/zh\/blog\/45793-2\/#local-main-organization-logo","url":"","contentUrl":"","caption":"Blog - Silicon Cloud"}]}},"_links":{"self":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/45793","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/comments?post=45793"}],"version-history":[{"count":2,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/45793\/revisions"}],"predecessor-version":[{"id":95397,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/45793\/revisions\/95397"}],"wp:attachment":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/media?parent=45793"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/categories?post=45793"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/tags?post=45793"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}