{"id":45615,"date":"2023-09-27T19:31:07","date_gmt":"2023-06-19T22:43:08","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45615-2\/"},"modified":"2024-05-04T01:51:18","modified_gmt":"2024-05-03T17:51:18","slug":"45615-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45615-2\/","title":{"rendered":""},"content":{"rendered":"

0. \u307e\u3068\u3081<\/h1>\n

\u7528\u9014\u5225:<\/p>\n

Ok \u304b\u3089 Ok \u3078\u304a\u3088\u3073 Err \u304b\u3089 Err \u3078\u306e\u5909\u63db<\/p>\n

map
\nmap_err
\nmap_or_else<\/p>\n

Ok \u304b\u3089 Err \u3078\u304a\u3088\u3073 Err \u304b\u3089 Ok \u3078\u306e\u5909\u63db<\/p>\n

and_then
\nor_else
\nmap_or_else<\/p>\n

\u5024\u540c\u58eb\u3092\u7d50\u5408<\/p>\n

and_then
\nor_else<\/p>\n

\u53c2\u7167<\/p>\n

as_ref, as_deref, as_mut, as_deref_mut<\/p>\n

\u8907\u88fd<\/p>\n

clone, clone_from<\/p>\n

copied, cloned<\/p>\n

\u203b map_or \u30e1\u30bd\u30c3\u30c9\u3082 map_or_else \u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5024\u3092\u9045\u5ef6\u8a55\u4fa1\u3059\u308b\u305f\u3081\u306b\u672c\u8a18\u4e8b\u3067\u306f map_or_else \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
\n\u203b and \u30e1\u30bd\u30c3\u30c9\u3082 and_then \u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5024\u3092\u9045\u5ef6\u8a55\u4fa1\u3059\u308b\u305f\u3081\u306b\u672c\u8a18\u4e8b\u3067\u306f map_or_else \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
\n\u203b or \u30e1\u30bd\u30c3\u30c9\u3082 or_else \u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5024\u3092\u9045\u5ef6\u8a55\u4fa1\u3059\u308b\u305f\u3081\u306b\u672c\u8a18\u4e8b\u3067\u306f map_or_else \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n

\/\/ <\/span>\r\npub<\/span> fn<\/span> map<\/span><<\/span>U<\/span>><\/span>(<\/span>self<\/span>:<\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>,<\/span> op<\/span>:<\/span> impl<\/span> FnOnce<\/span>(<\/span>T<\/span>)<\/span> -><\/span> U<\/span>)<\/span> -><\/span> Result<\/span><<\/span>U<\/span>,<\/span> E<\/span>><\/span>\r\npub<\/span> fn<\/span> map_err<\/span><<\/span>F<\/span>><\/span>(<\/span>self<\/span>:<\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>,<\/span> op<\/span>:<\/span> impl<\/span> FnOnce<\/span>(<\/span>E<\/span>)<\/span> -><\/span> F<\/span>)<\/span> -><\/span> Result<\/span><<\/span>T<\/span>,<\/span> F<\/span>><\/span>\r\n\r\n\/\/ <\/span>\r\npub<\/span> fn<\/span> map_or_else<\/span><<\/span>U<\/span>><\/span>(<\/span>self<\/span>:<\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>,<\/span> default<\/span>:<\/span> impl<\/span> FnOnce<\/span>(<\/span>E<\/span>)<\/span> -><\/span> U<\/span>,<\/span> f<\/span>:<\/span> impl<\/span> FnOnce<\/span>(<\/span>T<\/span>)<\/span> -><\/span> U<\/span>)<\/span> -><\/span> U<\/span>\r\n\r\n\/\/ <\/span>\r\npub<\/span> fn<\/span> and_then<\/span><<\/span>U<\/span>><\/span>(<\/span>self<\/span>:<\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>,<\/span> op<\/span>:<\/span> impl<\/span> FnOnce<\/span>(<\/span>T<\/span>)<\/span> -><\/span> Result<\/span><<\/span>U<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>U<\/span>,<\/span> E<\/span>><\/span>\r\npub<\/span> fn<\/span> or_else<\/span><<\/span>F<\/span>><\/span>(<\/span>self<\/span>:<\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>,<\/span> op<\/span>:<\/span> impl<\/span> FnOnce<\/span>(<\/span>E<\/span>)<\/span> -><\/span> Result<\/span><<\/span>T<\/span>,<\/span> F<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>T<\/span>,<\/span> F<\/span>><\/span>\r\n\r\n\/\/ <\/span>\r\npub<\/span> fn<\/span> as_ref<\/span>(<\/span>self<\/span>:<\/span> &<\/span>Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><&<\/span>T<\/span>,<\/span> &<\/span>E<\/span>><\/span>\r\npub<\/span> fn<\/span> as_deref<\/span>(<\/span>self<\/span>:<\/span> &<\/span>Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><&<\/span>T<\/span>::<\/span>Target<\/span>,<\/span> &<\/span>E<\/span>><\/span>\r\nwhere<\/span>\r\n    T<\/span>:<\/span> Deref<\/span>,<\/span>\r\n\r\npub<\/span> fn<\/span> as_mut<\/span>(<\/span>self<\/span>:<\/span> &<\/span>mut<\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><&<\/span>mut<\/span> T<\/span>,<\/span> &<\/span>mut<\/span> E<\/span>><\/span>\r\npub<\/span> fn<\/span> as_deref_mut<\/span>(<\/span>self<\/span>:<\/span> &<\/span>mut<\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><&<\/span>mut<\/span> T<\/span>::<\/span>Target<\/span>,<\/span> &<\/span>mut<\/span> E<\/span>><\/span>\r\nwhere<\/span>\r\n    T<\/span>:<\/span> DerefMut<\/span>,<\/span>\r\n\r\n\/\/ <\/span>\r\npub<\/span> fn<\/span> clone<\/span>(<\/span>self<\/span>:<\/span> &<\/span>Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>\r\npub<\/span> fn<\/span> clone_from<\/span>(<\/span>self<\/span>:<\/span> &<\/span>mut<\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>,<\/span> source<\/span>:<\/span> &<\/span>Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>)<\/span>\r\n\r\n\/\/ <\/span>\r\npub<\/span> fn<\/span> copied<\/span>(<\/span>self<\/span>:<\/span> Result<\/span><&<\/span>T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>\r\nwhere<\/span>\r\n    T<\/span>:<\/span> Copy<\/span>,<\/span>\r\npub<\/span> fn<\/span> cloned<\/span>(<\/span>self<\/span>:<\/span> Result<\/span><&<\/span>T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>\r\nwhere<\/span>\r\n    T<\/span>:<\/span> Clone<\/span>,<\/span>\r\npub<\/span> fn<\/span> copied<\/span>(<\/span>self<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>\r\nwhere<\/span>\r\n    T<\/span>:<\/span> Copy<\/span>,<\/span>\r\npub<\/span> fn<\/span> cloned<\/span>(<\/span>self<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> T<\/span>,<\/span> E<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>T<\/span>,<\/span> E<\/span>><\/span>\r\nwhere<\/span>\r\n    T<\/span>:<\/span> Clone<\/span>,<\/span>\r\n<\/code><\/pre>\n
\u53c2\u8003\u300cmap – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300cmap_err – Result in std::result – Rust\u300d<\/p>\n
\u53c2\u8003\u300cmap_or_else – Result in std::result – Rust\u300d<\/p>\n
\u53c2\u8003\u300cand_then – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300cor_else – Result in std::result – Rust\u300d<\/p>\n
\u53c2\u8003\u300cas_ref – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300cas_deref – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300cas_mut – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300cas_deref_mut – Result in std::result – Rust\u300d<\/p>\n
\u53c2\u8003\u300cclone – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300cclone_from – Result in std::result – Rust\u300d<\/p>\n
\u53c2\u8003\u300ccopied – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300ccloned – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300ccopied – Result in std::result – Rust\u300d
\n\u53c2\u8003\u300ccloned – Result in std::result – Rust\u300d<\/p>\n
1. Ok \u304b\u3089 Ok \u3078\u304a\u3088\u3073 Err \u304b\u3089 Err \u3078\u306e\u5909\u63db<\/h1>\n
1.1. Result<T, E> \u578b\u304b\u3089 Result<U, E> \u578b\u3078\u306e\u5909\u63db<\/h2>\n
Ok \u306e\u5024\u306e\u307f\u5909\u63db\u3059\u308b\u5834\u5408\u306f map \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n
let<\/span> f<\/span> =<\/span> |<\/span>t<\/span>:<\/span> i64<\/span>|<\/span> t<\/span>.to_string<\/span>();<\/span>\r\n\r\nlet<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>23<\/span>);<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>42<\/span>);<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x1<\/span>.map<\/span>(<\/span>f<\/span>);<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x2<\/span>.map<\/span>(<\/span>f<\/span>);<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y1<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y2<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok(\"23\")\r\nErr(42)\r\n<\/code><\/pre>\n
1.2. Result<T, E> \u578b\u304b\u3089 Result<T, F> \u578b\u3078\u306e\u5909\u63db<\/h2>\n
Err \u306e\u5024\u306e\u307f\u5909\u63db\u3059\u308b\u5834\u5408\u306f map_err \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n
let<\/span> f<\/span> =<\/span> |<\/span>e<\/span>:<\/span> i64<\/span>|<\/span> e<\/span>.to_string<\/span>();<\/span>\r\n\r\nlet<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>23<\/span>);<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>42<\/span>);<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> String<\/span>><\/span> =<\/span> x1<\/span>.map_err<\/span>(<\/span>f<\/span>);<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> String<\/span>><\/span> =<\/span> x2<\/span>.map_err<\/span>(<\/span>f<\/span>);<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y1<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y2<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok(23)\r\nErr(\"42\")\r\n<\/code><\/pre>\n
1.3. Result<T, E> \u578b\u304b\u3089 Result<U, F> \u578b\u3078\u306e\u5909\u63db<\/h2>\n
Ok \u3068 Err \u306e\u4e21\u65b9\u306e\u5024\u3092\u5909\u63db\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f (\u5c11\u306a\u304f\u3068\u3082\u30d0\u30fc\u30b8\u30e7\u30f3 1.73.0 \u73fe\u5728\u306f) \u6a19\u6e96\u3067\u306f\u63d0\u4f9b\u3055\u308c\u306a\u3044\u305f\u3081\u3001map_or_else \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u3066\u5909\u63db\u3057\u307e\u3059\u3002<\/p>\n
(\u203b map_or \u30e1\u30bd\u30c3\u30c9\u3067\u3082\u540c\u69d8\u306e\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001map_or \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u308b\u3068 self \u304c Ok \u306e\u5834\u5408\u3067\u3082 Err \u7528\u306e\u5f15\u6570\u306e\u8a08\u7b97\u3092\u6b63\u683c\u8a55\u4fa1\u3067\u884c\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001map_or_else \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u3066\u5f15\u6570\u3092\u9045\u5ef6\u8a55\u4fa1\u3057\u307e\u3059\u3002)
\n(\u203b map \u30e1\u30bd\u30c3\u30c9\u3068 map_err \u30e1\u30bd\u30c3\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3082\u540c\u69d8\u306e\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u6700\u9069\u5316\u3092\u8003\u616e\u3057\u306a\u3044\u5834\u5408\u306f\u8a08\u7b97\u30b3\u30b9\u30c8\u304c\u5897\u52a0\u3057\u307e\u3059\u3002)<\/p>\n
let<\/span> f<\/span> =<\/span> |<\/span>t<\/span>:<\/span> i64<\/span>|<\/span> t<\/span>.to_string<\/span>();<\/span>\r\nlet<\/span> g<\/span> =<\/span> |<\/span>e<\/span>:<\/span> i64<\/span>|<\/span> e<\/span>.to_string<\/span>();<\/span>\r\n\r\nlet<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>23<\/span>);<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>42<\/span>);<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> =<\/span> x1<\/span>.map_or_else<\/span>(|<\/span>e<\/span>|<\/span> Err<\/span>(<\/span>g<\/span>(<\/span>e<\/span>)),<\/span> |<\/span>t<\/span>|<\/span> Ok<\/span>(<\/span>f<\/span>(<\/span>t<\/span>)));<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> =<\/span> x2<\/span>.map_or_else<\/span>(|<\/span>e<\/span>|<\/span> Err<\/span>(<\/span>g<\/span>(<\/span>e<\/span>)),<\/span> |<\/span>t<\/span>|<\/span> Ok<\/span>(<\/span>f<\/span>(<\/span>t<\/span>)));<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y1<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y2<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok(\"23\")\r\nErr(\"42\")\r\n<\/code><\/pre>\n
2. Ok \u304b\u3089 Err \u3078\u304a\u3088\u3073 Err \u304b\u3089 Ok \u3078\u306e\u5909\u63db<\/h1>\n
2.1. Result<T, E> \u578b\u304b\u3089 Result<U, E> \u578b\u3078\u306e\u5909\u63db<\/h2>\n
Ok \u306e\u5024\u3092 Ok \u307e\u305f\u306f Err \u306e\u5024\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u306f and_then \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n
let<\/span> f<\/span> =<\/span> |<\/span>t<\/span>:<\/span> i64<\/span>|<\/span> if<\/span> t<\/span> >=<\/span> 0<\/span> {<\/span> Ok<\/span>(<\/span>t<\/span>.to_string<\/span>())<\/span> }<\/span> else<\/span> {<\/span> Err<\/span>(<\/span>t<\/span>)<\/span> };<\/span>\r\n\r\nlet<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>23<\/span>);<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>-<\/span>23<\/span>);<\/span>\r\nlet<\/span> x3<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>42<\/span>);<\/span>\r\nlet<\/span> x4<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>-<\/span>42<\/span>);<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x1<\/span>.and_then<\/span>(<\/span>f<\/span>);<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x2<\/span>.and_then<\/span>(<\/span>f<\/span>);<\/span>\r\nlet<\/span> y3<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x3<\/span>.and_then<\/span>(<\/span>f<\/span>);<\/span>\r\nlet<\/span> y4<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x4<\/span>.and_then<\/span>(<\/span>f<\/span>);<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y1<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y2<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y3<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y4<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok(\"23\")\r\nErr(-23)\r\nErr(42)\r\nErr(-42)\r\n<\/code><\/pre>\n
2.2. Result<T, E> \u578b\u304b\u3089 Result<T, F> \u578b\u3078\u306e\u5909\u63db<\/h2>\n
Err \u306e\u5024\u3092 Ok \u307e\u305f\u306f Err \u306e\u5024\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u306f or_else \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n
let<\/span> f<\/span> =<\/span> |<\/span>e<\/span>:<\/span> i64<\/span>|<\/span> if<\/span> e<\/span> >=<\/span> 0<\/span> {<\/span> Ok<\/span>(<\/span>e<\/span>)<\/span> }<\/span> else<\/span> {<\/span> Err<\/span>(<\/span>e<\/span>.to_string<\/span>())<\/span> };<\/span>\r\n\r\nlet<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>23<\/span>);<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>-<\/span>23<\/span>);<\/span>\r\nlet<\/span> x3<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>42<\/span>);<\/span>\r\nlet<\/span> x4<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>-<\/span>42<\/span>);<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> String<\/span>><\/span> =<\/span> x1<\/span>.or_else<\/span>(<\/span>f<\/span>);<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> String<\/span>><\/span> =<\/span> x2<\/span>.or_else<\/span>(<\/span>f<\/span>);<\/span>\r\nlet<\/span> y3<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> String<\/span>><\/span> =<\/span> x3<\/span>.or_else<\/span>(<\/span>f<\/span>);<\/span>\r\nlet<\/span> y4<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> String<\/span>><\/span> =<\/span> x4<\/span>.or_else<\/span>(<\/span>f<\/span>);<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y1<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y2<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y3<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y4<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok(23)\r\nOk(-23)\r\nOk(42)\r\nErr(\"-42\")\r\n<\/code><\/pre>\n
2.3. Result<T, E> \u578b\u304b\u3089 Result<U, F> \u578b\u3078\u306e\u5909\u63db<\/h2>\n
Ok \u3068 Err \u306e\u76f8\u4e92\u5909\u63db\u3092\u3059\u308b\u5834\u5408\u306f map_or_else \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n
let<\/span> f<\/span> =<\/span> |<\/span>t<\/span>:<\/span> i64<\/span>|<\/span> {<\/span>\r\n    if<\/span> t<\/span> >=<\/span> 0<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>t<\/span>.to_string<\/span>())<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        Err<\/span>(<\/span>t<\/span>.to_string<\/span>())<\/span>\r\n    }<\/span>\r\n};<\/span>\r\nlet<\/span> g<\/span> =<\/span> |<\/span>e<\/span>:<\/span> i64<\/span>|<\/span> {<\/span>\r\n    if<\/span> e<\/span> >=<\/span> 0<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>e<\/span>.to_string<\/span>())<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        Err<\/span>(<\/span>e<\/span>.to_string<\/span>())<\/span>\r\n    }<\/span>\r\n};<\/span>\r\n\r\nlet<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>23<\/span>);<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>-<\/span>23<\/span>);<\/span>\r\nlet<\/span> x3<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>42<\/span>);<\/span>\r\nlet<\/span> x4<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>-<\/span>42<\/span>);<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> =<\/span> x1<\/span>.map_or_else<\/span>(<\/span>g<\/span>,<\/span> f<\/span>);<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> =<\/span> x2<\/span>.map_or_else<\/span>(<\/span>g<\/span>,<\/span> f<\/span>);<\/span>\r\nlet<\/span> y3<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> =<\/span> x3<\/span>.map_or_else<\/span>(<\/span>g<\/span>,<\/span> f<\/span>);<\/span>\r\nlet<\/span> y4<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> =<\/span> x4<\/span>.map_or_else<\/span>(<\/span>g<\/span>,<\/span> f<\/span>);<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y1<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y2<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y3<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y4<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok(\"23\")\r\nErr(\"-23\")\r\nOk(\"42\")\r\nErr(\"-42\")\r\n<\/code><\/pre>\n
3. \u5024\u540c\u58eb\u3092\u7d50\u5408\u3059\u308b<\/h1>\n
3.1. Result<T, E> \u578b\u304b\u3089 Result<U, E> \u578b\u3078\u306e\u5909\u63db<\/h2>\n
and_then \u30e1\u30bd\u30c3\u30c9\u306f\u30012 \u5024\u304c\u4e21\u65b9\u3068\u3082 Ok \u306a\u3089 Ok \u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306f Err \u3092\u8fd4\u3059\u76ee\u7684\u3067\u3082\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
(\u203b and \u30e1\u30bd\u30c3\u30c9\u3067\u3082\u540c\u69d8\u306e\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001and \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u308b\u3068 self \u304c Err \u306e\u5834\u5408\u3067\u3082\u5f15\u6570\u306e\u8a08\u7b97\u3092\u6b63\u683c\u8a55\u4fa1\u3067\u884c\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001and_then \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u3066\u5f15\u6570\u3092\u9045\u5ef6\u8a55\u4fa1\u3057\u307e\u3059\u3002)<\/p>\n
let<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>23<\/span>);<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> Err<\/span>(<\/span>\"Error: x\"<\/span>);<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> x1<\/span>.and_then<\/span>(|<\/span>_<\/span>|<\/span> Ok<\/span>(<\/span>\"Foo\"<\/span>));<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> x1<\/span>.and_then<\/span>(|<\/span>_<\/span>|<\/span> Err<\/span>(<\/span>\"Error: y\"<\/span>));<\/span>\r\nlet<\/span> y3<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> x2<\/span>.and_then<\/span>(|<\/span>_<\/span>|<\/span> Ok<\/span>(<\/span>\"Foo\"<\/span>));<\/span>\r\nlet<\/span> y4<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> x2<\/span>.and_then<\/span>(|<\/span>_<\/span>|<\/span> Err<\/span>(<\/span>\"Error: y\"<\/span>));<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y1<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y2<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y3<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y4<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok(\"Foo\")\r\nErr(\"Error: y\")\r\nErr(\"Error: x\")\r\nErr(\"Error: x\")\r\n<\/code><\/pre>\n
3.2. Result<T, E> \u578b\u304b\u3089 Result<T, F> \u578b\u3078\u306e\u5909\u63db<\/h2>\n
or_else \u30e1\u30bd\u30c3\u30c9\u306f\u30012 \u5024\u306e\u3069\u3061\u3089\u304b\u4e00\u65b9\u304c Ok \u306a\u3089 Ok \u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306f Err \u3092\u8fd4\u3059\u76ee\u7684\u3067\u3082\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
(\u203b or \u30e1\u30bd\u30c3\u30c9\u3067\u3082\u540c\u69d8\u306e\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001or \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u308b\u3068 self \u304c Ok \u306e\u5834\u5408\u3067\u3082\u5f15\u6570\u306e\u8a08\u7b97\u3092\u6b63\u683c\u8a55\u4fa1\u3067\u884c\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001or_else \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u3066\u5f15\u6570\u3092\u9045\u5ef6\u8a55\u4fa1\u3057\u307e\u3059\u3002)<\/p>\n
let<\/span> x1<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>\"Foo\"<\/span>);<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>23<\/span>);<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> x1<\/span>.or_else<\/span>(|<\/span>_<\/span>|<\/span> Ok<\/span>(<\/span>\"Bar\"<\/span>));<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> x1<\/span>.or_else<\/span>(|<\/span>_<\/span>|<\/span> Err<\/span>(<\/span>\"Error: y\"<\/span>));<\/span>\r\nlet<\/span> y3<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> x2<\/span>.or_else<\/span>(|<\/span>_<\/span>|<\/span> Ok<\/span>(<\/span>\"Bar\"<\/span>));<\/span>\r\nlet<\/span> y4<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>str<\/span>><\/span> =<\/span> x2<\/span>.or_else<\/span>(|<\/span>_<\/span>|<\/span> Err<\/span>(<\/span>\"Error: y\"<\/span>));<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y1<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y2<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y3<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> y4<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok(\"Foo\")\r\nOk(\"Foo\")\r\nOk(\"Bar\")\r\nErr(\"Error: y\")\r\n<\/code><\/pre>\n
4. \u53c2\u7167<\/h1>\n
Ok \u304a\u3088\u3073 Err \u306e\u4e2d\u8eab\u306e\u5024\u3092\u501f\u7528\u3057\u307e\u3059\u3002<\/p>\n
Ok \u306b\u95a2\u3057\u3066\u306f\u4e2d\u8eab\u306e\u5024\u3092\u501f\u7528\u304b\u3064 deref() \u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
let<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>\"Foo\"<\/span>.to_string<\/span>());<\/span>\r\nlet<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>23<\/span>);<\/span>\r\n\r\n\/\/ <\/span>\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><&<\/span>String<\/span>,<\/span> &<\/span>i64<\/span>><\/span> =<\/span> x1<\/span>.as_ref<\/span>();<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><&<\/span>String<\/span>,<\/span> &<\/span>i64<\/span>><\/span> =<\/span> x2<\/span>.as_ref<\/span>();<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>i64<\/span>><\/span> =<\/span> x1<\/span>.as_deref<\/span>();<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><&<\/span>str<\/span>,<\/span> &<\/span>i64<\/span>><\/span> =<\/span> x2<\/span>.as_deref<\/span>();<\/span>\r\n<\/code><\/pre>\n
let<\/span> mut<\/span> x1<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>\"Foo\"<\/span>.to_string<\/span>());<\/span>\r\nlet<\/span> mut<\/span> x2<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Err<\/span>(<\/span>23<\/span>);<\/span>\r\n\r\n\/\/<\/span>\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> String<\/span>,<\/span> &<\/span>mut<\/span> i64<\/span>><\/span> =<\/span> x1<\/span>.as_mut<\/span>();<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> String<\/span>,<\/span> &<\/span>mut<\/span> i64<\/span>><\/span> =<\/span> x2<\/span>.as_mut<\/span>();<\/span>\r\n\r\nlet<\/span> y1<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> str<\/span>,<\/span> &<\/span>mut<\/span> i64<\/span>><\/span> =<\/span> x1<\/span>.as_deref_mut<\/span>();<\/span>\r\nlet<\/span> y2<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> str<\/span>,<\/span> &<\/span>mut<\/span> i64<\/span>><\/span> =<\/span> x2<\/span>.as_deref_mut<\/span>();<\/span>\r\n<\/code><\/pre>\n
5. \u8907\u88fd<\/h1>\n
Ok \u304a\u3088\u3073 Err \u306e\u5916\u8eab\u306e\u5024\u3092\u8907\u88fd\u3059\u308b\u5834\u5408\u306f clone \u30e1\u30bd\u30c3\u30c9\u307e\u305f\u306f clone_from \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n
let<\/span> x<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>23<\/span>);<\/span>\r\n\r\n\/\/ <\/span>\r\nlet<\/span> y<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x<\/span>.clone<\/span>();<\/span>\r\n\r\nlet<\/span> mut<\/span> y<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x<\/span>.clone<\/span>();<\/span>\r\ny<\/span>.clone_from<\/span>(<\/span>&<\/span>x<\/span>);<\/span>\r\n<\/code><\/pre>\n
Ok \u306e\u4e2d\u8eab\u306e\u5024\u3092\u8907\u88fd\u3059\u308b\u5834\u5408\u306f copied \u30e1\u30bd\u30c3\u30c9\u307e\u305f\u306f cloned \u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u307e\u3059\u3002<\/p>\n
\/\/<\/span>\r\nlet<\/span> value<\/span> =<\/span> 23<\/span>;<\/span>\r\nlet<\/span> x<\/span>:<\/span> Result<\/span><&<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>&<\/span>value<\/span>);<\/span>\r\nlet<\/span> y<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x<\/span>.copied<\/span>();<\/span>\r\n\r\nlet<\/span> value<\/span> =<\/span> 23<\/span>;<\/span>\r\nlet<\/span> x<\/span>:<\/span> Result<\/span><&<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>&<\/span>value<\/span>);<\/span>\r\nlet<\/span> y<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x<\/span>.cloned<\/span>();<\/span>\r\n\r\n\/\/<\/span>\r\nlet<\/span> value<\/span> =<\/span> \"Foo\"<\/span>.to_string<\/span>();<\/span>\r\nlet<\/span> x<\/span>:<\/span> Result<\/span><&<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>&<\/span>value<\/span>);<\/span>\r\nlet<\/span> y<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x<\/span>.cloned<\/span>();<\/span>\r\n\r\n\/\/<\/span>\r\nlet<\/span> mut<\/span> value<\/span> =<\/span> 23<\/span>;<\/span>\r\nlet<\/span> x<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>&<\/span>mut<\/span> value<\/span>);<\/span>\r\nlet<\/span> y<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x<\/span>.copied<\/span>();<\/span>\r\n\r\nlet<\/span> mut<\/span> value<\/span> =<\/span> 23<\/span>;<\/span>\r\nlet<\/span> x<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>&<\/span>mut<\/span> value<\/span>);<\/span>\r\nlet<\/span> y<\/span>:<\/span> Result<\/span><<\/span>i64<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x<\/span>.cloned<\/span>();<\/span>\r\n\r\n\/\/<\/span>\r\nlet<\/span> mut<\/span> value<\/span> =<\/span> \"Foo\"<\/span>.to_string<\/span>();<\/span>\r\nlet<\/span> x<\/span>:<\/span> Result<\/span><&<\/span>mut<\/span> String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> Ok<\/span>(<\/span>&<\/span>mut<\/span> value<\/span>);<\/span>\r\nlet<\/span> y<\/span>:<\/span> Result<\/span><<\/span>String<\/span>,<\/span> i64<\/span>><\/span> =<\/span> x<\/span>.cloned<\/span>();<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
0. \u307e\u3068\u3081 \u7528\u9014\u5225: Ok \u304b\u3089 Ok \u3078\u304a\u3088\u3073 Err \u304b\u3089 Err \u3078\u306e\u5909\u63db map map_err m […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45615","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\/45615-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"0. \u307e\u3068\u3081 \u7528\u9014\u5225: Ok \u304b\u3089 Ok \u3078\u304a\u3088\u3073 Err \u304b\u3089 Err \u3078\u306e\u5909\u63db map map_err m […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45615-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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