{"id":206147,"date":"2025-06-12T13:51:53","date_gmt":"2025-06-12T05:51:53","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206147\/"},"modified":"2025-06-12T13:51:53","modified_gmt":"2025-06-12T05:51:53","slug":"go-%e8%af%ad%e8%a8%80%e4%b8%ad%e7%9a%84-var-_-type-typenil-%e8%af%ad%e6%b3%95%e6%9c%89%e4%bb%80%e4%b9%88%e4%bd%9c%e7%94%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206147\/","title":{"rendered":"Go \u8bed\u8a00\u4e2d\u7684 `var _ Type = (*type)(nil)` \u8bed\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f"},"content":{"rendered":"

\u5b66\u4e60
\nGOLANG<\/span>\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d\u8981\u6025\uff01\u4eca\u5929\u7684\u8fd9\u7bc7\u6587\u7ae0
\n\u300aGo \u8bed\u8a00\u4e2d\u7684 `var _ Type = (*type)(nil)` \u8bed\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u300b<\/span>\u5c06\u4f1a\u4ecb\u7ecd\u5230
\n<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60
\nGOLANG<\/span>\uff0c\u53ef\u4ee5\u5173\u6ce8\u6211\uff01\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\u7684\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u80fd\u6709\u6240\u5e2e\u52a9\uff01,
\n,
\ngo \u8bed\u8a00\u4e2d\u4e00\u4e2a\u7279\u6b8a\u8bed\u6cd5\uff1avar _ type = (*type)(nil)<\/strong>,\u5728 go \u8bed\u8a00\u4e2d\uff0c\u6709\u4e00\u884c\u8bed\u6cd5\u53ef\u80fd\u4f1a\u8ba9\u65b0\u624b\u611f\u5230\u56f0\u60d1\uff1avar _ type = (*type)(nil)\u3002\u90a3\u4e48\uff0c\u8fd9\u884c\u4ee3\u7801\u5230\u5e95\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f,
\n\u8bed\u6cd5\u8be6\u89e3<\/strong>,
\n\u7528\u9014<\/strong>,\u8fd9\u884c\u4ee3\u7801\u7684\u4e3b\u8981\u76ee\u7684\u662f\u4f5c\u4e3a\u7f16\u8bd1\u65f6\u7684\u7c7b\u578b\u9632\u5b88\u673a\u5236\u3002\u5b83\u7528\u4e8e\u68c0\u67e5 type \u662f\u5426\u6b63\u786e\u5b9e\u73b0\u4e86 type \u63a5\u53e3\u3002\u5982\u679c\u5b9e\u73b0\u4e0d\u6b63\u786e\uff0c\u7f16\u8bd1\u5668\u4f1a\u5728\u7f16\u8bd1\u65f6\u62a5\u9519\u3002,
\n\u793a\u4f8b<\/strong>,\u6211\u4eec\u4ee5\u793a\u4f8b\u6765\u8bf4\u660e\u5b83\u7684\u7528\u6cd5\uff1a,\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86 var _ type = (*type)(nil) \u6765\u786e\u4fdd cat \u7c7b\u578b\u5b9e\u73b0\u4e86 hellointer \u63a5\u53e3\u3002\u5982\u679c cat \u7c7b\u578b\u6ca1\u6709\u5b9e\u73b0\u8be5\u63a5\u53e3\uff0c\u7f16\u8bd1\u5668\u4f1a\u4ea7\u751f\u4ee5\u4e0b\u9519\u8bef\uff1a,
\n\u603b\u7ed3<\/strong>,\u4f7f\u7528 var _ type = (*type)(nil) \u662f\u5728\u7f16\u8bd1\u65f6\u786e\u4fdd\u7c7b\u578b\u6b63\u786e\u6027\u7684\u6709\u6548\u65b9\u6cd5\u3002\u5b83\u53ef\u4ee5\u5728\u4ee3\u7801\u5f00\u53d1\u65e9\u671f\u53d1\u73b0\u5b9e\u73b0\u95ee\u9898\uff0c\u4ece\u800c\u907f\u514d\u8fd0\u884c\u65f6\u7684\u4e0d\u53ef\u9884\u6599\u884c\u4e3a\u3002,\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aGo \u8bed\u8a00\u4e2d\u7684 `var _ Type = (*type)(nil)` \u8bed\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\u5427\uff01,(*type)(nil)\uff1a\u5c06 type \u7684\u96f6\u503c\uff08\u5373 nil\uff09\u8f6c\u6362\u4e3a type \u6307\u9488\u7c7b\u578b\u3002,var _ type\uff1a\u58f0\u660e\u4e00\u4e2a\u540d\u4e3a _ \u7684\u53d8\u91cf\uff0c\u7c7b\u578b\u4e3a type\u3002\u7531\u4e8e _ \u53ea\u662f\u5360\u4f4d\u7b26\uff0c\u56e0\u6b64\u5b83\u4e0d\u4f1a\u88ab\u5b9e\u9645\u4f7f\u7528\u6216\u5206\u914d\u3002,go \u8bed\u8a00\u4e2d\u4e00\u4e2a\u7279\u6b8a\u8bed\u6cd5\uff1avar _ type = (*type)(nil),\u5b66\u4e60
\nGOLANG<\/span>\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d\u8981\u6025\uff01\u4eca\u5929\u7684\u8fd9\u7bc7\u6587\u7ae0
\n\u300aGo \u8bed\u8a00\u4e2d\u7684 `var _ Type = (*type)(nil)` \u8bed\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u300b<\/span>\u5c06\u4f1a\u4ecb\u7ecd\u5230
\n<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60
\nGOLANG<\/span>\uff0c\u53ef\u4ee5\u5173\u6ce8\u6211\uff01\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\u7684\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u80fd\u6709\u6240\u5e2e\u52a9\uff01,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> Go \u8bed\u8a00\u4e2d\u7684 `var _ Type = (*type)(nil)` \u8bed\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/span><\/p>\n

Go \u8bed\u8a00\u4e2d\u7684 `var _ Type = (*type)(nil)` \u8bed\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/h1>\n

2024-11-04 20:19:04<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5b66\u4e60GOLANG<\/span>\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d\u8981\u6025\uff01\u4eca\u5929\u7684\u8fd9\u7bc7\u6587\u7ae0\u300aGo \u8bed\u8a00\u4e2d\u7684 `var _ Type = (*type)(nil)` \u8bed\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u300b<\/span>\u5c06\u4f1a\u4ecb\u7ecd\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60GOLANG<\/span>\uff0c\u53ef\u4ee5\u5173\u6ce8\u6211\uff01\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\u7684\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u80fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

<\/p>\n

go \u8bed\u8a00\u4e2d\u4e00\u4e2a\u7279\u6b8a\u8bed\u6cd5\uff1avar _ type = (*type)(nil)<\/strong><\/p>\n

\u5728 go \u8bed\u8a00\u4e2d\uff0c\u6709\u4e00\u884c\u8bed\u6cd5\u53ef\u80fd\u4f1a\u8ba9\u65b0\u624b\u611f\u5230\u56f0\u60d1\uff1avar _ type = (*type)(nil)\u3002\u90a3\u4e48\uff0c\u8fd9\u884c\u4ee3\u7801\u5230\u5e95\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f<\/p>\n

\u8bed\u6cd5\u8be6\u89e3<\/strong><\/p>\n

    \n
  • var _ type\uff1a\u58f0\u660e\u4e00\u4e2a\u540d\u4e3a _ \u7684\u53d8\u91cf\uff0c\u7c7b\u578b\u4e3a type\u3002\u7531\u4e8e _ \u53ea\u662f\u5360\u4f4d\u7b26\uff0c\u56e0\u6b64\u5b83\u4e0d\u4f1a\u88ab\u5b9e\u9645\u4f7f\u7528\u6216\u5206\u914d\u3002<\/li>\n
  • (*type)(nil)\uff1a\u5c06 type \u7684\u96f6\u503c\uff08\u5373 nil\uff09\u8f6c\u6362\u4e3a type \u6307\u9488\u7c7b\u578b\u3002<\/li>\n<\/ul>\n

    \u7528\u9014<\/strong><\/p>\n

    \u8fd9\u884c\u4ee3\u7801\u7684\u4e3b\u8981\u76ee\u7684\u662f\u4f5c\u4e3a\u7f16\u8bd1\u65f6\u7684\u7c7b\u578b\u9632\u5b88\u673a\u5236\u3002\u5b83\u7528\u4e8e\u68c0\u67e5 type \u662f\u5426\u6b63\u786e\u5b9e\u73b0\u4e86 type \u63a5\u53e3\u3002\u5982\u679c\u5b9e\u73b0\u4e0d\u6b63\u786e\uff0c\u7f16\u8bd1\u5668\u4f1a\u5728\u7f16\u8bd1\u65f6\u62a5\u9519\u3002<\/p>\n

    \u793a\u4f8b<\/strong><\/p>\n

    \u6211\u4eec\u4ee5\u793a\u4f8b\u6765\u8bf4\u660e\u5b83\u7684\u7528\u6cd5\uff1a<\/p>\n

    var _ hellointer = (*cat)(nil)\n\ntype hellointer interface {\n    hello() string\n}\n\ntype cat struct {\n    hellointer\n    name string\n}\n\nfunc (c *cat) hello() string {\n    return c.name + \"miaomiao\"\n}<\/pre>\n
    \u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86 var _ type = (*type)(nil) \u6765\u786e\u4fdd cat \u7c7b\u578b\u5b9e\u73b0\u4e86 hellointer \u63a5\u53e3\u3002\u5982\u679c cat \u7c7b\u578b\u6ca1\u6709\u5b9e\u73b0\u8be5\u63a5\u53e3\uff0c\u7f16\u8bd1\u5668\u4f1a\u4ea7\u751f\u4ee5\u4e0b\u9519\u8bef\uff1a<\/p>\n
    invalid conversion: (*Cat)(nil) is not HelloInter<\/pre>\n
    \u603b\u7ed3<\/strong><\/p>\n
    \u4f7f\u7528 var _ type = (*type)(nil) \u662f\u5728\u7f16\u8bd1\u65f6\u786e\u4fdd\u7c7b\u578b\u6b63\u786e\u6027\u7684\u6709\u6548\u65b9\u6cd5\u3002\u5b83\u53ef\u4ee5\u5728\u4ee3\u7801\u5f00\u53d1\u65e9\u671f\u53d1\u73b0\u5b9e\u73b0\u95ee\u9898\uff0c\u4ece\u800c\u907f\u514d\u8fd0\u884c\u65f6\u7684\u4e0d\u53ef\u9884\u6599\u884c\u4e3a\u3002<\/p>\n
    \u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aGo \u8bed\u8a00\u4e2d\u7684 `var _ Type = (*type)(nil)` \u8bed\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\u5427\uff01<\/p>\n
    \n
    \n <\/dt>\n
    \n   \u62bd\u8c61\uff1a\u89e3\u7801 Java \u4e2d\u7684\u62bd\u8c61\u7c7b\n <\/dd>\n<\/dl>\n
    \n
    \n <\/dt>\n
    \n   \u4f7f\u7528 Github \u9875\u9762\u90e8\u7f72 React Nextjs \u5e94\u7528\u7a0b\u5e8f\u7684\u6b65\u9aa4\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    \u5b66\u4e60 GOLANG\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d...<\/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-206147","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206147","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=206147"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206147\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206147"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}