{"id":207785,"date":"2025-07-08T09:23:14","date_gmt":"2025-07-08T01:23:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207785\/"},"modified":"2025-07-08T09:23:14","modified_gmt":"2025-07-08T01:23:14","slug":"%e5%9c%a8%e4%b8%8d%e5%90%8c%e7%bb%93%e6%9e%84%e4%b9%8b%e9%97%b4%e5%85%b1%e4%ba%ab%e6%96%b9%e6%b3%95%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207785\/","title":{"rendered":"\u5728\u4e0d\u540c\u7ed3\u6784\u4e4b\u95f4\u5171\u4eab\u65b9\u6cd5\u5b9e\u73b0"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u5728\u4e0d\u540c\u7ed3\u6784\u4e4b\u95f4\u5171\u4eab\u65b9\u6cd5\u5b9e\u73b0<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-25 16:45:33<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5c0f\u4f19\u4f34\u4eec\u5bf9Golang\u7f16\u7a0b\u611f\u5174\u8da3\u5417\uff1f\u662f\u5426\u6b63\u5728\u5b66\u4e60\u76f8\u5173\u77e5\u8bc6\u70b9\uff1f\u5982\u679c\u662f\uff0c\u90a3\u4e48\u672c\u6587\u300a\u5728\u4e0d\u540c\u7ed3\u6784\u4e4b\u95f4\u5171\u4eab\u65b9\u6cd5\u5b9e\u73b0\u300b\uff0c\u5c31\u5f88\u9002\u5408\u4f60\uff0c\u672c\u7bc7\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec\u3002\u5728\u4e4b\u540e\u7684\u6587\u7ae0\u4e2d\u4e5f\u4f1a\u591a\u591a\u5206\u4eab\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u5047\u8bbe\u6211\u4eec\u6709 2 \u4e2a\u7ed3\u6784\u4f53\u5171\u4eab\u4e00\u4e2a\u5c5e\u6027\uff0c\u5177\u6709\u76f8\u540c\u7684\u540d\u79f0\u548c\u7528\u9014\uff0c\u4f46\u5927\u5c0f\u4e0d\u540c\uff1a<\/p>\n

type (\n    l16 struct {\n        length uint16\n    }\n\n    l32 struct {\n        length uint32\n    }\n)\n<\/pre>\n
\u76ee\u6807\u662f\u4f7f\u8fd9\u4e9b\u7ed3\u6784\u4f53\u5177\u6709\u5177\u6709\u5b8c\u5168\u76f8\u540c\u7b7e\u540d\u548c\u5b9e\u73b0\u7684 getlength<\/code> \u65b9\u6cd5\uff1a<\/p>\n
func (h *l16) getlength() int {\n    return int(h.length)\n}\n\nfunc (h *l32) getlength() int {\n    return int(h.length)\n}\n<\/pre>\n
\u2014\u2014\u4f46\u8981\u907f\u514d\u91cd\u590d\u6bcf\u4e2a\u7ed3\u6784\u7684\u5b9e\u73b0\u3002<\/p>\n
\u6240\u4ee5\u6211\u5c1d\u8bd5\uff1a<\/p>\n
type (\n\n    LengthHolder interface {\n        GetLength() int\n    }\n\n    LengthHolderStruct struct {\n        LengthHolder\n    }\n\n    L16 struct {\n        LengthHolderStruct\n        Length uint16\n    }\n\n    L32 struct {\n        LengthHolderStruct\n        Length uint32\n    }\n\n)\n\nfunc (h *LengthHolderStruct) GetLength() int {\n    return int(h.Length)\n}\n<\/pre>\n
 – \u4f46 h.length \u672a\u5b9a\u4e49\u9519\u8bef\uff08\u7c7b\u578b *lengthholderstruct \u6ca1\u6709\u5b57\u6bb5\u6216\u65b9\u6cd5 length\uff09<\/code>\u3002<\/p>\n
\u6211\u4eec\u8be5\u600e\u4e48\u505a\uff1f<\/p>\n
 <\/p>\n
\u6b63\u786e\u7b54\u6848<\/h2>\n
 <\/p>\n
\u8f6c\u5230 1.17 \u53ca\u4ee5\u4e0b\u7248\u672c<\/h4>\n
\u6beb\u4e0d\u5ba2\u6c14\u7684\u56de\u7b54\u662f
\n 
\n   \u4f60\u4e0d\u80fd
\n <\/strike>\u4f60\u4e0d\u5e94\u8be5\u3002\u53ea\u9700\u5728\u6bcf\u4e2a\u7ed3\u6784\u4e0a\u5b9e\u73b0\u8be5\u65b9\u6cd5\u5373\u53ef\u8ba9\u672a\u6765\u7684\u60a8\u548c\u5176\u4ed6\u7ef4\u62a4\u8005\u611f\u5230\u9ad8\u5174\u3002<\/p>\n
\u65e0\u8bba\u5982\u4f55\uff0c\u5047\u8bbe\u60a8\u7edd\u5bf9\u5fc5\u987b\u8fd9\u6837\u505a\uff0c\u5f53\u7136 embedded<\/strong> \u7c7b\u578b\u5bf9 embedding<\/strong> \u7c7b\u578b\u4e00\u65e0\u6240\u77e5\uff0c\u56e0\u6b64\u60a8\u65e0\u6cd5\u4ece lengthholderstruct<\/code> \u5f15\u7528 length<\/code> .<\/p>\n
\u5c31\u6211\u4e2a\u4eba\u800c\u8a00\uff0c\u6211\u8ba4\u4e3a \u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u59a5\u534f\u65b9\u6848\u3002\u4e3a\u4e86\u63d0\u4f9b\u66ff\u4ee3\u65b9\u6848\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u5c06 length<\/code> \u5b57\u6bb5\u58f0\u660e\u4e3a\u5d4c\u5165\u5f0f\u7ed3\u6784\u4e0a\u7684 interface{}<\/code> \u5e76\u4f7f\u7528\u7c7b\u578b\u5f00\u5173\uff08\u5728\u5783\u573e\u7bb1\u4e2d\u629b\u51fa\u7c7b\u578b\u5b89\u5168\uff09\uff0c\u4ee5\u975e\u5e38\u96be\u770b<\/em>\u7684\u65b9\u5f0f\u89e3\u51b3\u6b64\u95ee\u9898.<\/p>\n
\u6211\u4e0d\u4f1a\u5728\u6211\u7684\u751f\u4ea7\u7cfb\u7edf\u4e2d\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff0c\u4f46\u4f60\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n
func main() {\n    l16 := l16{\n        lengthholderstruct: lengthholderstruct{\n            length: uint16(200), \n            \/\/ but nothing stops you from setting uint32(200)\n        },\n    }\n    fmt.println(l16.getlength())\n}\n\ntype (\n    lengthholder interface {\n        getlength() int\n    }\n\n    lengthholderstruct struct {\n        length interface{}\n    }\n\n    l16 struct {\n        lengthholderstruct\n    }\n\n    l32 struct {\n        lengthholderstruct\n    }\n)\n\nfunc (h *lengthholderstruct) getlength() int {\n    switch t := h.length.(type) {\n    case uint16:\n        return int(t)\n    case uint32:\n        return int(t)\n    }\n    return 0\n}<\/pre>\n
\u8f6c\u5230 1.18 \u53ca\u66f4\u9ad8\u7248\u672c<\/h4>\n
\u4f7f\u7528\u6cdb\u578b\u3002\u53ea\u8981constraint<\/code>\u4e2d\u7684\u7c7b\u578b\u90fd\u53ef\u4ee5\u8f6c\u6362\u4e3aint<\/code>\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
type Constraint interface {\n     ~uint16 | ~uint32\n}\n\ntype LX[T Constraint] struct {\n    Length T\n}\n\nfunc (h *LX[T]) GetLength() int {\n    return int(h.Length)\n}\n\nfunc main() {\n    lx := LX[uint16]{\n        Length: uint16(200),\n    }\n    fmt.Println(lx.GetLength()) \/\/ 200\n}<\/pre>\n
go\u6f14\u793a\uff1a<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u5728\u4e0d\u540c\u7ed3\u6784\u4e4b\u95f4\u5171\u4eab\u65b9\u6cd5\u5b9e\u73b0\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207785","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207785","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207785"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207785\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207785"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207785"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207785"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}