{"id":207965,"date":"2025-07-08T11:57:07","date_gmt":"2025-07-08T03:57:07","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207965\/"},"modified":"2025-07-08T11:57:07","modified_gmt":"2025-07-08T03:57:07","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e5%9c%a8%e8%bf%99%e4%b8%aa%e4%be%8b%e5%ad%90%e4%b8%ad%e6%88%91%e4%bb%ac%e8%bf%94%e5%9b%9e%e4%b8%80%e4%b8%aa%e6%8c%87%e9%92%88%e8%80%8c%e4%b8%8d%e6%98%af%e4%b8%80%e4%b8%aa","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207965\/","title":{"rendered":"\u4e3a\u4ec0\u4e48\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u6211\u4eec\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\u800c\u4e0d\u662f\u4e00\u4e2a\u503c\uff1f"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4e3a\u4ec0\u4e48\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u6211\u4eec\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\u800c\u4e0d\u662f\u4e00\u4e2a\u503c\uff1f<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-27 13:24:56<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300a\u4e3a\u4ec0\u4e48\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u6211\u4eec\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\u800c\u4e0d\u662f\u4e00\u4e2a\u503c\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n

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

package main\n\nimport \"fmt\"\n\n\ntype argError struct {\n    arg  int\n    prob string\n}\n\nfunc (e *argError) Error() string {\n    return fmt.Sprintf(\"%d - %s\", e.arg, e.prob)\n}\n\nfunc f2(arg int) (int, error) {\n    return -1, &argError{arg, \"can't work with it\"}\n}\n\nfunc main() {\n\n    _, e := f2(42)\n    if ae, ok := e.(*argError); ok {\n        fmt.Println(ae.arg)\n        fmt.Println(ae.prob)\n    }\n}<\/pre>\n
\u5728 f2 \u4e2d\uff0c\u6211\u4eec\u5c06\u6307\u9488 &argerror…<\/strong> \u4f5c\u4e3a\u8fd4\u56de\u503c\uff0c\u4f46\u65b9\u6cd5\u58f0\u660e\u4e3a\u8fd4\u56de error<\/strong>\u3002\u4e3a\u4ec0\u4e48f2\u7b7e\u540d\u6ca1\u6709\u5b9a\u4e49\u4e3a<\/p>\n
func f2(arg int) (int, *error<\/strong>) \u800c\u662f\uff1f\u6216\u8005\u4e3a\u4ec0\u4e48\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6211\u4eec\u8fd4\u56de\u6307\u9488\u800c\u4e0d\u662f\u503c\uff1f<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
error \u662f\u4e00\u4e2a\u8981\u6c42\u6709 Error() string<\/code> \u65b9\u6cd5\u7684\u63a5\u53e3\u3002<\/p>\n
\u8fd9\u91cc\u7684\u95ee\u9898\u662f\u60a8\u5728\u6307\u9488\u4e0a\u58f0\u660e\u4e86 Error() string<\/code> \u65b9\u6cd5\u3002 func (e *argError) Error() string<\/code>\uff0c\u56e0\u6b64\u53ea\u6709 *argError<\/code> \u5b9e\u73b0 error<\/code>\uff0c\u4f46\u4e0d\u80fd\u5b9e\u73b0 argError<\/code>\u3002\u6240\u4ee5\u53ea\u80fd\u8fd4\u56de\u4e00\u4e2a&argError{...}<\/code>\u3002<\/p>\n
\u60a8\u5e94\u8be5\u77e5\u9053\u6307\u9488\u7684 *error<\/code> \u548c error<\/code> \u662f\u4e0d\u540c\u7684\u3002\u524d\u8005\u662f\u6307\u5411\u6301\u6709\u4efb\u4f55\u5177\u4f53\u7c7b\u578b\u7684 interface<\/code> \u7684\u6307\u9488\uff0c\u540e\u8005\u662f\u6301\u6709\u6307\u9488\u7684 interface<\/code> \u3002 <\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u7531\u4e8e interface<\/code> \u90fd\u662f\u5173\u4e8e\u65b9\u6cd5\u7684\uff0c\u56e0\u6b64\u6307\u5411 interface<\/code> \u7684\u6307\u9488\u5f88\u5c11\u6709\u7528\uff0c\u800c\u6301\u6709\u6307\u9488\u7684 interface<\/code> \u5219\u88ab\u5e7f\u6cdb\u4f7f\u7528\u3002 <\/p>\n
\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8eGolang\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/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-207965","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207965","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=207965"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207965\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}