{"id":45156,"date":"2023-03-16T04:55:02","date_gmt":"2023-04-27T11:29:59","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45156-2\/"},"modified":"2024-04-29T19:05:42","modified_gmt":"2024-04-29T11:05:42","slug":"45156-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45156-2\/","title":{"rendered":""},"content":{"rendered":"

wasm-bindgen\u3092\u898b\u306a\u304c\u3089Cast\u306e\u7df4\u7fd2<\/p>\n

JS <-> Rust\u9593\u306e\u5024\u306e\u53d7\u3051\u6e21\u3057\u3092\u8a55\u4fa1\u3002
\nFloat64Array\u3067Rust\u306b\u6e21\u3057\u3066JS\u306bFloat64Array\u3067\u8fd4\u3059\u3002<\/p>\n

\u9014\u4e2dRust\u5185\u3067\u3001f64 -> vec -> ndarray matrix -> vec -> Box<[f64]> \u306b\u5909\u63db<\/p>\n

[dependencies]\r\nwasm-bindgen = \"0.2.63\"\r\nndarray = \"0.15.6\"\r\n<\/code><\/pre>\n
let<\/span> f64<\/span> =<\/span> new<\/span> Float64Array<\/span>([<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>,<\/span> 6<\/span>,<\/span> 7<\/span>,<\/span> 8<\/span>,<\/span> 9<\/span>]);<\/span>\r\nlet<\/span> resf64<\/span> =<\/span> wasm<\/span>.<\/span>take_boxed_number_slice_by_value<\/span>(<\/span>f64<\/span>);<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>resf64<\/span>);<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>resf64<\/span> instanceof<\/span> Float64Array<\/span>);<\/span> \/\/ true<\/span>\r\n<\/code><\/pre>\n
\r\nuse<\/span> wasm_bindgen<\/span>::<\/span>prelude<\/span>::<\/span>*<\/span>;<\/span>\r\nuse<\/span> ndarray<\/span>::<\/span>prelude<\/span>::<\/span>*<\/span>;<\/span>\r\n\r\n...<\/span>\r\n\r\n\r\nfn<\/span> type_of<\/span><<\/span>T<\/span>><\/span>(<\/span>_<\/span>:<\/span> T<\/span>)<\/span> -><\/span> String<\/span>{<\/span>\r\n    let<\/span> a<\/span> =<\/span> std<\/span>::<\/span>any<\/span>::<\/span>type_name<\/span>::<\/span><<\/span>T<\/span>><\/span>();<\/span>\r\n    return<\/span> a<\/span>.to_string<\/span>();<\/span>\r\n}<\/span>\r\n\r\n#[wasm_bindgen]<\/span>\r\npub<\/span> fn<\/span> take_boxed_number_slice_by_value<\/span>(<\/span>x<\/span>:<\/span> &<\/span>[<\/span>f64<\/span>])<\/span> -><\/span> Box<\/span><<\/span>[<\/span>f64<\/span>]<\/span>><\/span> {<\/span>\r\n   \r\n    let<\/span> mut<\/span> vec<\/span> =<\/span> Vec<\/span>::<\/span>new<\/span>();<\/span>\r\n    vec<\/span>.extend<\/span>(<\/span>x<\/span>.iter<\/span>()<\/span>.copied<\/span>());<\/span>\r\n\r\n    let<\/span> matrix<\/span> =<\/span> Array<\/span>::<\/span>from_vec<\/span>(<\/span>vec<\/span>)<\/span>.into_shape<\/span>((<\/span>3<\/span>,<\/span>3<\/span>))<\/span>.unwrap<\/span>();<\/span>\r\n    alert<\/span>(<\/span>&<\/span>format!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> matrix<\/span>));<\/span>\r\n\r\n    let<\/span> (<\/span>w<\/span>,<\/span> h<\/span>)<\/span> =<\/span> {<\/span>\r\n        let<\/span> shape<\/span> =<\/span> matrix<\/span>.shape<\/span>();<\/span>\r\n        (<\/span>shape<\/span>[<\/span>1<\/span>],<\/span> shape<\/span>[<\/span>0<\/span>])<\/span>\r\n    };<\/span>\r\n    let<\/span> v1<\/span> =<\/span> matrix<\/span>.into_shape<\/span>(<\/span>h<\/span>*<\/span>w<\/span>)<\/span>.unwrap<\/span>()<\/span>.to_vec<\/span>()<\/span>.into_boxed_slice<\/span>();<\/span>\r\n    v1<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30e1\u30e2<\/h2>\n
\u516c\u5f0f\u306eHello World\u3092\u898b\u306a\u304c\u3089wasm-bindgen\u74b0\u5883\u3092\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3059\u308b\u3068\u3001npm link\u306e\u8a18\u8ff0\u304c\u306a\u3044\u70ba\u3001\u5909\u66f4\u306e\u53cd\u6620\u304c\u3067\u304d\u306a\u304f\u3066\u30cf\u30de\u308b\u306e\u3067\u6ce8\u610f\u3059\u308b\u3002npm link\u306f\u3053\u3061\u3089\u3092\u53c2\u8003\u306b\u3057\u305f\u3002
\nextern create\u306f\u3044\u3089\u306a\u3044\u3002Cargo.toml\u306b\u66f8\u3044\u305f\u3089\u547c\u3073\u51fa\u305b\u308b
\nJS<->Rust\u3067 Float64Array\u306f\u53e4\u3044\u8a18\u4e8b\u3067\u306fpointer\u3067\u6e21\u3057\u3066\u3044\u308b\u304c\u3001\u66f8\u304d\u65b9\u304c\u6539\u5584\u3057\u3066\u3044\u308b\u3002
\n\u30ed\u30fc\u30ab\u30eb\u306ePlayground\u74b0\u5883\u306fJupyter\u304c\u4f7f\u3048\u308b<\/p>\n
$ <\/span>brew install <\/span>jupyter\r\n$ <\/span>cargo install <\/span>evcxr_jupyter\r\n$ <\/span>evcxr_jupyter --install<\/span>\r\n<\/code><\/pre>\n
    Jupyter\u4e0a\u306eRust\u3067ndarray\u3092\u4f7f\u3046\u5834\u5408\u306f\u304a\u307e\u3058\u306a\u3044\u304c\u5fc5\u8981<\/ul>\n
    :<\/span>dep<\/span> showata<\/span> =<\/span> {<\/span> version<\/span> =<\/span> \"0.3\"<\/span>,<\/span> features<\/span>=<\/span>[<\/span>\"show_ndarray\"<\/span>]}<\/span>\r\n:<\/span>dep<\/span> ndarray<\/span> =<\/span> \"0.14\"<\/span>\r\n\r\nuse<\/span> showata<\/span>::<\/span>Showable<\/span>;<\/span>\r\nuse<\/span> ndarray<\/span>::<\/span>prelude<\/span>::<\/span>*<\/span>;<\/span>\r\n<\/code><\/pre>\n
    \u53c2\u8003<\/h2>\n
    rust\u3067ndarray\u3092\u5229\u7528\u3057\u3066\u884c\u5217\u3092\u6271\u3046\u65b9\u6cd5<\/p>\n
    wasm-bindgen<\/p>\n
    Number Slices
    \nBoxed Number Slices<\/p>\n
    Rust ?and WebAssembly<\/p>\n
    \u521d\u3081\u3066Rust\u3067WebAssembly\u3059\u308b\u3068\u304d\u306b\u7d39\u4ecb\u3057\u305f\u3044\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb (\u5165\u9580)<\/p>\n
    evcxr_jupyter<\/p>\n
    showata<\/p>\n","protected":false},"excerpt":{"rendered":"
    wasm-bindgen\u3092\u898b\u306a\u304c\u3089Cast\u306e\u7df4\u7fd2 JS <-> Rust\u9593\u306e\u5024\u306e\u53d7\u3051\u6e21\u3057\u3092\u8a55\u4fa1\u3002  […]<\/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-45156","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\/45156-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"wasm-bindgen\u3092\u898b\u306a\u304c\u3089Cast\u306e\u7df4\u7fd2 JS <-> Rust\u9593\u306e\u5024\u306e\u53d7\u3051\u6e21\u3057\u3092\u8a55\u4fa1\u3002 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45156-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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