{"id":45551,"date":"2023-06-18T02:29:52","date_gmt":"2023-02-17T05:35:50","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45551-2\/"},"modified":"2024-04-30T09:24:11","modified_gmt":"2024-04-30T01:24:11","slug":"45551-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45551-2\/","title":{"rendered":""},"content":{"rendered":"

C++\u3068Rust\u3092\u6bd4\u8f03\u3059\u308b<\/h1>\n

C++\u3084\u3063\u3066\u308b\u3051\u3069\u3001\u300cRust\u3063\u3066\u5b89\u5168\u3060\u3088\u300d\u3063\u3066\u8a00\u308f\u308c\u3066\u8208\u5473\u3092\u6301\u3063\u305f\u4eba\u5411\u3051\u3002
\n\u7528\u8a9e\u306fC++\u8996\u70b9\u3067\u3002<\/p>\n

\u95a2\u6570\u306b\u6587\u5b57\u5217\u3092\u6e21\u3059<\/h2>\n

C++<\/h3>\n
#include <iostream>\r\n<\/span>\r\nvoid<\/span> say<\/span>(<\/span>std<\/span>::<\/span>string<\/span> str<\/span>){<\/span>\r\n    std<\/span>::<\/span>cout<\/span> <<<\/span> \"say: \"<\/span> <<<\/span> str<\/span> <<<\/span> std<\/span>::<\/span>endl<\/span>;<\/span>\r\n}<\/span>\r\n\r\nint<\/span> main<\/span>()<\/span>\r\n{<\/span>\r\n\r\n    auto<\/span> str<\/span> =<\/span> \"hello\"<\/span>;<\/span>\r\n    say<\/span>(<\/span>str<\/span>);<\/span>\r\n    std<\/span>::<\/span>cout<\/span> <<<\/span> \"main: \"<\/span> <<<\/span> str<\/span> <<<\/span> std<\/span>::<\/span>endl<\/span>;<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
Output<\/p>\n
say: hello\r\nmain: hello\r\n<\/code><\/pre>\n
Rust<\/h3>\n
fn<\/span> say<\/span>(<\/span>str<\/span>:<\/span> String<\/span>){<\/span>\r\n    println!<\/span>(<\/span>\"say: {}\"<\/span>,<\/span> str<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n\r\n    let<\/span> str<\/span> =<\/span> String<\/span>::<\/span>from<\/span>(<\/span>\"hello\"<\/span>);<\/span>\r\n    say<\/span>(<\/span>str<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"say: {}\"<\/span>,<\/span> str<\/span>);<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
error[E0382]: borrow of moved value: str<\/h3>\n
  --> src\/main.rs:10:25\r\n   |\r\n8  |     let str = String::from(\"hello\");\r\n   |         --- move occurs because `str` has type `std::string::String`, which does not implement the `Copy` trait\r\n9  |     say(str);\r\n   |         --- value moved here\r\n10 |     println!(\"say: {}\", str);\r\n   |                         ^^^ value borrowed here after move\r\n<\/code><\/pre>\n
Rust\u3067\u306f\u53c2\u7167\u3067\u306f\u306a\u3044\u5024\u306b\u6e21\u3059\u3068\u6240\u6709\u6a29\u304c\u79fb\u52d5\u3059\u308b(say\u547c\u3073\u51fa\u3057\u306e\u6642\u70b9\u3067main\u3067\u306fstr\u304c\u4f7f\u3048\u306a\u304f\u306a\u308b)<\/p>\n
Rust\u306b\u9ed9\u3089\u305b\u308b\u30b3\u30fc\u30c9(\u53c2\u7167\u3067\u6e21\u3059)<\/h3>\n
fn<\/span> say<\/span>(<\/span>str<\/span>:<\/span> &<\/span>String<\/span>){<\/span>\r\n    println!<\/span>(<\/span>\"say: {}\"<\/span>,<\/span> str<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n\r\n    let<\/span> str<\/span> =<\/span> String<\/span>::<\/span>from<\/span>(<\/span>\"hello\"<\/span>);<\/span>\r\n    say<\/span>(<\/span>&<\/span>str<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"say: {}\"<\/span>,<\/span> str<\/span>);<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
Rust\u306b\u9ed9\u3089\u305b\u308b\u30b3\u30fc\u30c9(\u6240\u6709\u6a29\u3092\u8fd4\u3057\u3066\u3082\u3089\u3046)<\/h3>\n
Rust\u306f\u4ee3\u5165\u6642\u306b\u6587\u5b57\u5217\u3092\u52dd\u624b\u306b\u518d\u78ba\u4fdd\uff06\u30b3\u30d4\u30fc\u3057\u305f\u308a\u3057\u307e\u305b\u3093\u3002<\/p>\n
fn<\/span> say<\/span>(<\/span>str<\/span>:<\/span> String<\/span>)<\/span> -><\/span> String<\/span>{<\/span>\r\n    println!<\/span>(<\/span>\"say: {}\"<\/span>,<\/span> str<\/span>);<\/span>\r\n    str<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n\r\n    let<\/span> str<\/span> =<\/span> String<\/span>::<\/span>from<\/span>(<\/span>\"hello\"<\/span>);<\/span>\r\n    let<\/span> str<\/span> =<\/span> say<\/span>(<\/span>str<\/span>);<\/span> \/\/\u30b7\u30e3\u30c9\u30fc\u30a4\u30f3\u30b0\u3068\u8a00\u3063\u3066\u3001\u540c\u540d\u3067\u4e0a\u66f8\u304d\u3067\u304d\u308b<\/span>\r\n    println!<\/span>(<\/span>\"say: {}\"<\/span>,<\/span> str<\/span>);<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u9006\u306bRust\u3063\u307d\u3044\u3053\u3068\u3092\u3001C++\u3067\u66f8\u3044\u3066\u307f\u308b<\/h3>\n
\u6240\u6709\u6a29\u3092\uff11\u3064\u306b\u9650\u5b9a\u3059\u308b\uff08C++11\u4ee5\u4e0a\uff09<\/p>\n
#include <iostream>\r\n#include <memory>\r\n#include <utility>\r\n<\/span>\r\n\r\nstd<\/span>::<\/span>unique_ptr<\/span><<\/span>std<\/span>::<\/span>string<\/span>><\/span> say<\/span>(<\/span>std<\/span>::<\/span>unique_ptr<\/span><<\/span>std<\/span>::<\/span>string<\/span>><\/span> str<\/span>){<\/span>\r\n    std<\/span>::<\/span>cout<\/span> <<<\/span> \"say: \"<\/span> <<<\/span> *<\/span>str<\/span> <<<\/span> std<\/span>::<\/span>endl<\/span>;<\/span>\r\n    return<\/span> str<\/span>;<\/span>\r\n}<\/span>\r\n\r\n\r\nint<\/span> main<\/span>()<\/span>\r\n{<\/span>\r\n\r\n    std<\/span>::<\/span>unique_ptr<\/span><<\/span>std<\/span>::<\/span>string<\/span>><\/span> str<\/span>(<\/span>new<\/span> std<\/span>::<\/span>string<\/span>(<\/span>\"hello\"<\/span>));<\/span>\r\n\r\n    auto<\/span> str2<\/span> =<\/span> say<\/span>(<\/span>std<\/span>::<\/span>move<\/span>(<\/span>str<\/span>));<\/span>\r\n\r\n    std<\/span>::<\/span>cout<\/span> <<<\/span> \"str@main: \"<\/span> <<<\/span> str<\/span> <<<\/span> std<\/span>::<\/span>endl<\/span>;<\/span>\r\n\r\n    \/\/\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u306a\u3044\u3068\u843d\u3061\u307e\u3059<\/span>\r\n    \/\/std::cout << \"*str@main: \" << *str << std::endl;<\/span>\r\n    std<\/span>::<\/span>cout<\/span> <<<\/span> \"*str2@main: \"<\/span> <<<\/span> *<\/span>str2<\/span> <<<\/span> std<\/span>::<\/span>endl<\/span>;<\/span>\r\n\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Output<\/p>\n
say: hello\r\nstr@main: 0x0\r\n*str2@main: hello\r\n<\/code><\/pre>\n
C++\u3067\u306f<\/p>\n
    unique_ptr\u3092\u4f7f\u3063\u3066\u3082\u3001\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u305f\u884c\u306e\u3088\u3046\u306b\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u3001\u305d\u3057\u3066\u6b7b\u306c<\/ul>\n","protected":false},"excerpt":{"rendered":"
    C++\u3068Rust\u3092\u6bd4\u8f03\u3059\u308b C++\u3084\u3063\u3066\u308b\u3051\u3069\u3001\u300cRust\u3063\u3066\u5b89\u5168\u3060\u3088\u300d\u3063\u3066\u8a00\u308f\u308c\u3066\u8208\u5473\u3092\u6301\u3063\u305f\u4eba\u5411\u3051\u3002 \u7528\u8a9e […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45551","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\/45551-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"C++\u3068Rust\u3092\u6bd4\u8f03\u3059\u308b C++\u3084\u3063\u3066\u308b\u3051\u3069\u3001\u300cRust\u3063\u3066\u5b89\u5168\u3060\u3088\u300d\u3063\u3066\u8a00\u308f\u308c\u3066\u8208\u5473\u3092\u6301\u3063\u305f\u4eba\u5411\u3051\u3002 \u7528\u8a9e […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45551-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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