{"id":45532,"date":"2023-10-11T23:22:30","date_gmt":"2022-11-07T20:16:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45532-2\/"},"modified":"2024-05-04T03:45:42","modified_gmt":"2024-05-03T19:45:42","slug":"45532-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45532-2\/","title":{"rendered":""},"content":{"rendered":"

Rust\u3067\u6574\u6570\u5024\u304c\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3057\u305f\u5834\u5408\u306e\u6319\u52d5\u3092\u307e\u3068\u3081\u3066\u307f\u307e\u3059\u3002<\/p>\n

\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u8d77\u304d\u308b\u5f0f<\/h1>\n

\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u8d77\u3053\u3059\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3001Rust Playground\u306b\u8cbc\u308a\u4ed8\u3051\u3066\u5b9f\u884c\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n

fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span>:<\/span> u8<\/span> =<\/span> 200<\/span>;<\/span>\r\n    let<\/span> b<\/span>:<\/span> u8<\/span> =<\/span> 100<\/span>;<\/span>\r\n    let<\/span> c<\/span>:<\/span> u8<\/span> =<\/span> a<\/span> +<\/span> b<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> c<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3092\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
thread 'main' panicked at 'attempt to add with overflow', src\/main.rs:5:17\r\nnote: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.\r\n<\/code><\/pre>\n
\u3068\u3044\u3046\u308f\u3051\u3067\u3001Rust\u306f\u6574\u6570\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u691c\u77e5\u3057\u3001\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u767a\u751f\u6642\u306b\u306f\u30d1\u30cb\u30c3\u30af\u3092\u8d77\u3053\u3057\u307e\u3059\u3002<\/p>\n
Release\u30e2\u30fc\u30c9\u3067\u306f\u3069\u3046\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
44\r\n<\/code><\/pre>\n
Release\u30e2\u30fc\u30c9\u3060\u3068\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u691c\u77e5\u305b\u305a\u3001\u7121\u8996\u3057\u305f\u7d50\u679c\u304c\u8fd4\u3063\u3066\u304d\u307e\u3057\u305f\u3002\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4e0a\u306e\u554f\u984c\u304b\u3089\u3001Release\u30e2\u30fc\u30c9\u3067\u306f\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u691c\u77e5\u3059\u308b\u30b3\u30fc\u30c9\u306f\u53d6\u308a\u9664\u304b\u308c\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n
C\u8a00\u8a9e\u306a\u3069\u306f\u7b26\u53f7\u4ed8\u304d\u6574\u6570\u306e\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306f\u672a\u5b9a\u7fa9\u52d5\u4f5c\u306b\u306a\u308a\u307e\u3059\u304c\u3001Rust\u3067\u306f\u672a\u5b9a\u7fa9\u52d5\u4f5c\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001Release\u30e2\u30fc\u30c9\u3067\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u304d\u305f\u9014\u7aef\u306b\u5168\u3066\u58ca\u308c\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3082\u3061\u308d\u3093\u3001\u6355\u6349\u3055\u308c\u306a\u3044\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306f\u8d77\u3053\u3055\u306a\u3044\u3088\u3046\u306b\u3059\u3079\u304d\u306a\u306e\u3067\u3001\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u304d\u5f97\u308b\u7b87\u6240\u3067\u306f\u4ee5\u4e0b\u306b\u8ff0\u3079\u308b\u3088\u3046\u306b\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u660e\u793a\u7684\u306b\u5236\u5fa1\u3059\u3079\u304d\u3067\u3057\u3087\u3046\u3002<\/p>\n
Rust\u3067\u306e\u6574\u6570\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u6271\u3044\u306f\u3001Myths and Legends about Integer Overflow in Rust\u3068\u3044\u3046\u8a18\u4e8b\u304c\u53c2\u8003\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u5236\u5fa1\u3059\u308b<\/h1>\n
\u6574\u6570\u306e\u64cd\u4f5c\u3067\u8d77\u3053\u308b\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306f\u3001Debug\u30e2\u30fc\u30c9\u3067\u306f\u30c1\u30a7\u30c3\u30af\u3055\u308c\u3001Release\u30e2\u30fc\u30c9\u3067\u306f\u7121\u8996\u3055\u308c\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u660e\u793a\u7684\u306b\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u30c1\u30a7\u30c3\u30af\u3057\u305f\u308a\u3001\u7121\u8996\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u305d\u306e\u305f\u3081\u306b\u3001Rust\u3067\u306f\u6574\u6570\u578b\u306b\u3044\u304f\u3064\u304b\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
wrapping<\/h2>\n
wrapping\u3067\u59cb\u307e\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u304a\u304d\u3066\u3082\u6ea2\u308c\u305f\u6841\u3092\u7121\u8996\u3057\u305f\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
assert_eq!<\/span>(<\/span>250u8<\/span>.wrapping_add<\/span>(<\/span>10<\/span>),<\/span> 4<\/span>);<\/span>\r\nassert_eq!<\/span>(<\/span>4u8<\/span>.wrapping_sub<\/span>(<\/span>10<\/span>),<\/span> 250<\/span>);<\/span>\r\n<\/code><\/pre>\n
wrapping_add\u3067\u8db3\u3057\u7b97\u3001wrapping_sub\u3067\u5f15\u304d\u7b97\u306b\u306a\u308a\u307e\u3059\u3002\u4ed6\u306e\u56db\u5247\u6f14\u7b97\u3084\u4f59\u308a\u7b49\u306e\u8a08\u7b97\u306b\u3082\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
checked<\/h2>\n
checked\u3067\u59cb\u307e\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u304d\u305f\u5834\u5408\u306bNone\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
assert_eq!<\/span>(<\/span>200u8<\/span>.checked_add<\/span>(<\/span>50<\/span>),<\/span> Some<\/span>(<\/span>250<\/span>));<\/span>\r\nassert_eq!<\/span>(<\/span>200u8<\/span>.checked_add<\/span>(<\/span>60<\/span>),<\/span> None<\/span>);<\/span>\r\n<\/code><\/pre>\n
wrapping\u7cfb\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u69d8\u3001\u56db\u5247\u6f14\u7b97\u3084\u305d\u306e\u4ed6\u306e\u6f14\u7b97\u306e\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u540c\u69d8\u3067\u3059\u3002<\/p>\n
overflowing<\/h2>\n
overflowing\u3067\u59cb\u307e\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u8a08\u7b97\u7d50\u679c\u3068\u305d\u306e\u6f14\u7b97\u3067\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u3053\u3063\u305f\u304b\u3069\u3046\u304b\u306ebool\u5024\u306e\u30bf\u30d7\u30eb\u3092\u8fd4\u3057\u307e\u3059\u3002\u8a08\u7b97\u7d50\u679c\u306fwrapping\u7cfb\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
assert_eq!<\/span>(<\/span>200u8<\/span>.overflowing_add<\/span>(<\/span>50<\/span>),<\/span> (<\/span>250<\/span>,<\/span> false<\/span>));<\/span>\r\nassert_eq!<\/span>(<\/span>200u8<\/span>.overflowing_add<\/span>(<\/span>60<\/span>),<\/span> (<\/span>4<\/span>,<\/span> true<\/span>));<\/span>\r\n<\/code><\/pre>\n
saturating<\/h2>\n
saturating\u3067\u59cb\u307e\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u3053\u308b\u3088\u3046\u306a\u5834\u5408\u306b\u3001\u8a08\u7b97\u7d50\u679c\u304c\u305d\u306e\u578b\u306e\u6700\u5927\u5024\u3082\u3057\u304f\u306f\u6700\u5c0f\u5024\u3067\u98fd\u548c\u3057\u307e\u3059\u3002<\/p>\n
assert_eq!<\/span>(<\/span>200u8<\/span>.saturating_add<\/span>(<\/span>50<\/span>),<\/span> 250<\/span>);<\/span>\r\nassert_eq!<\/span>(<\/span>200u8<\/span>.saturating_add<\/span>(<\/span>60<\/span>),<\/span> 255<\/span>);<\/span>\r\nassert_eq!<\/span>((<\/span>-<\/span>100i8<\/span>)<\/span>.saturating_sub<\/span>(<\/span>50<\/span>),<\/span> -<\/span>128<\/span>);<\/span>\r\n<\/code><\/pre>\n
Wrapping<\/h2>\n
std::num::Wrapping\u3092\u4f7f\u3063\u3066\u6574\u6570\u3092\u30e9\u30c3\u30d7\u3059\u308b\u3068\u3001+-*\/\u3068\u3044\u3063\u305f\u6f14\u7b97\u5b50\u304cwrapping\u7cfb\u306e\u6f14\u7b97\u306b\u7f6e\u304d\u63db\u308f\u308a\u307e\u3059\u3002<\/p>\n
use<\/span> std<\/span>::<\/span>num<\/span>::<\/span>Wrapping<\/span>;<\/span>\r\nassert_eq!<\/span>(<\/span>Wrapping<\/span>(<\/span>250u8<\/span>)<\/span> +<\/span> Wrapping<\/span>(<\/span>10u8<\/span>),<\/span> Wrapping<\/span>(<\/span>4u8<\/span>));<\/span>\r\nassert_eq!<\/span>(<\/span>Wrapping<\/span>(<\/span>4u8<\/span>)<\/span> -<\/span> Wrapping<\/span>(<\/span>10u8<\/span>),<\/span> Wrapping<\/span>(<\/span>250u8<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u307e\u3068\u3081<\/h1>\n
\u6574\u6570\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306f\u30d0\u30b0\u306e\u6e29\u5e8a\u306b\u306a\u308a\u3084\u3059\u3044\u3068\u3053\u308d\u3067\u3001\u305d\u308c\u306b\u5bfe\u3059\u308bRust\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306f\u3001\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u4e88\u60f3\u3055\u308c\u308b\u3068\u3053\u308d\u3067\u306f\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u660e\u793a\u7684\u306b\u51e6\u7406\u3057\u3001\u305d\u306e\u4ed6\u306e\u5834\u6240\u3067\u306fDebug\u30e2\u30fc\u30c9\u3067\u3067\u304d\u308b\u3060\u3051\u6355\u6349\u3059\u308b\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002Python\u306e\u3088\u3046\u306b\u6574\u6570\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u7121\u3044\u8a00\u8a9e\u3082\u3042\u308a\u307e\u3059\u304c\u3001Rust\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3082\u91cd\u8996\u3059\u308b\u8a00\u8a9e\u3067\u3059\u306e\u3067\u3042\u308b\u7a0b\u5ea6\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u9762\u5012\u3092\u898b\u3066\u3084\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3001C\u306a\u3069\u3060\u3068\u30a2\u30c9\u30ec\u30b9\u306e\u8a08\u7b97\u4e2d\u306b\u6574\u6570\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u304d\u308b\u3068\u30e1\u30e2\u30ea\u95a2\u9023\u306e\u30d0\u30b0\u306e\u539f\u56e0\u306b\u306a\u308b\u3068\u3053\u308d\u3092\u3001Rust\u3067\u306funsafe\u306a\u3053\u3068\u3092\u3057\u306a\u3044\u9650\u308a\u6574\u6570\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u304d\u3066\u3082\u30e1\u30e2\u30ea\u5b89\u5168\u6027\u304c\u4fdd\u305f\u308c\u308b\u306e\u306fRust\u3089\u3057\u3044\u3068\u3053\u308d\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Rust\u3067\u6574\u6570\u5024\u304c\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3057\u305f\u5834\u5408\u306e\u6319\u52d5\u3092\u307e\u3068\u3081\u3066\u307f\u307e\u3059\u3002 \u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u8d77\u304d\u308b\u5f0f \u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u8d77 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45532","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\/45532-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"Rust\u3067\u6574\u6570\u5024\u304c\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3057\u305f\u5834\u5408\u306e\u6319\u52d5\u3092\u307e\u3068\u3081\u3066\u307f\u307e\u3059\u3002 \u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u8d77\u304d\u308b\u5f0f \u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u8d77 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45532-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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