{"id":207239,"date":"2025-07-08T10:14:01","date_gmt":"2025-07-08T02:14:01","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207239\/"},"modified":"2025-07-08T10:14:01","modified_gmt":"2025-07-08T02:14:01","slug":"%e5%87%bd%e6%95%b0%e6%8c%87%e9%92%88%e4%bd%9c%e4%b8%ba%e8%bf%94%e5%9b%9e%e6%8e%a5%e5%8f%a3%e7%9a%84%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207239\/","title":{"rendered":"\u51fd\u6570\u6307\u9488\u4f5c\u4e3a\u201c\u8fd4\u56de\u63a5\u53e3{}\u201d\u7684\u53c2\u6570"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u51fd\u6570\u6307\u9488\u4f5c\u4e3a\u201c\u8fd4\u56de\u63a5\u53e3{}\u201d\u7684\u53c2\u6570<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-20 23:48:38<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u52aa\u529b\u5b66\u4e60\u5427\uff01\u672c\u6587\u300a\u51fd\u6570\u6307\u9488\u4f5c\u4e3a\u201c\u8fd4\u56de\u63a5\u53e3{}\u201d\u7684\u53c2\u6570\u300b<\/span>\u4e3b\u8981\u8bb2\u89e3\u4e86<\/span>\u7b49\u7b49\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6211\u4f1a\u5728\u4e2d\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u7cfb\u5217\u6587\u7ae0\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u5e76\u79ef\u6781\u7559\u8a00\u5efa\u8bae\u3002\u4e0b\u9762\u5c31\u5148\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u672c\u7bc7\u6b63\u6587\u5185\u5bb9\u5427\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n

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

\u6211\u60f3\u5c06\u51fd\u6570\u6307\u9488\u4f20\u9012\u7ed9\u201c\u4efb\u4f55\u4e1c\u897f\u201d\u3002<\/p>\n

\u6253\u5370\u4ece\u4efb\u4f55\u4e1c\u897f\u4f20\u5165\u7684\u5185\u5bb9\u90fd\u5f88\u5bb9\u6613\uff08\u5982 https:\/\/play.golang.org\/p\/gmoy6jwxgm0 \u4e2d\u6240\u793a\uff09\uff1a<\/p>\n

func printstuff(stuff interface{}) {\n    fmt.printf(\"testing : %v\", stuff)\n}<\/pre>\n
\u4f46\u662f\uff0c\u5047\u8bbe\u6211\u60f3\u8fd9\u6837\u505a\uff1a<\/p>\n
    \n
  1. \u6709\u591a\u4e2a\u7ed3\u6784<\/li>\n
  2. \u4ece\u5404\u79cd\u51fd\u6570\u52a0\u8f7d\u6570\u636e<\/li>\n
  3. \u6709\u4e00\u4e2a\u53ef\u4ee5\u4e3a\u6211\u8c03\u7528\u8be5\u51fd\u6570\u7684\u901a\u7528\u6253\u5370<\/li>\n<\/ol>\n
    \u6211\u5728 play (https:\/\/play.golang.org\/p\/l3-okl6tsmw) \u4e2d\u5c1d\u8bd5\u4e86\u6b64\u64cd\u4f5c\uff0c\u4f46\u6536\u5230\u4ee5\u4e0b\u9519\u8bef\uff1a<\/p>\n
     .\/prog.go:35:12\uff1a\u65e0\u6cd5\u5728 printstuff \u7684\u53c2\u6570\u4e2d\u4f7f\u7528 getstuff1 \uff08\u7c7b\u578b func() someobject\uff09\u4f5c\u4e3a\u7c7b\u578b functype .\/prog.go:36:12\uff1a\u65e0\u6cd5\u5728 printstuff \u7684\u53c2\u6570\u4e2d\u4f7f\u7528 getstuff2 \uff08\u7c7b\u578b func() someotherobject\uff09\u4f5c\u4e3a\u7c7b\u578b functype <\/p>\n
    \u5982\u679c play \u5185\u5bb9\u88ab\u5220\u9664\uff0c\u4e0b\u9762\u662f\u6211\u8bd5\u56fe\u5f04\u6e05\u695a\u5982\u4f55\u5f00\u59cb\u5de5\u4f5c\u7684\u4ee3\u7801\uff1a<\/p>\n
    package main\n\nimport (\n    \"fmt\"\n)\n\ntype someobject struct {\n    value string\n}\n\ntype someotherobject struct {\n        value string\n}\n\ntype functype func() interface{}\n\nfunc getstuff1() someobject {\n    return someobject{\n        value: \"hello, world!\",\n    }\n}\n\nfunc getstuff2() someotherobject {\n    return someotherobject{\n        value: \"another, hello!\",\n    }\n}\n\nfunc printstuff(tocall functype) {\n    stuff := tocall()\n    fmt.printf(\"testing : %v\", stuff)\n}\n\nfunc main() {\n    printstuff(getstuff1)\n    printstuff(getstuff2)\n}<\/pre>\n
    \u6b63\u786e\u4f20\u9012\u8fd9\u4e9b\u5185\u5bb9\u7684\u79d8\u8bc0\u662f\u4ec0\u4e48\uff1f<\/p>\n
    \u66f4\u5927\u7684\u76ee\u6807\u8bf4\u660e<\/h2>\n
    \u6240\u4ee5\u6211\u5728\u8fd9\u91cc\u60f3\u8981\u5b8c\u6210\u7684\u662f\u51cf\u5c11\u5b58\u5728\u4e8e\u5de8\u5927\u6587\u4ef6\u4e2d\u7684\u6837\u677f\u4ee3\u7801\u3002\u4e0d\u5e78\u7684\u662f\uff0c\u7531\u4e8e\u5176\u4ed6\u9650\u5236\uff0c\u6211\u73b0\u5728\u65e0\u6cd5\u8fdb\u4e00\u6b65\u91cd\u6784\u5b83\uff0c\u6211\u60f3\u77e5\u9053\u8003\u8651\u5230\u9519\u8bef\u6d88\u606f\u548c\u6211\u8bfb\u5230\u7684\u5185\u5bb9\u4f3c\u4e4e\u53e6\u6709\u8bf4\u660e\uff0c\u8fd9\u662f\u5426\u53ef\u80fd\u3002<\/p>\n
    \u6709\u5927\u91cf\u7684\u590d\u5236\u7c98\u8d34\u4ee3\u7801\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
    func resendcontradevice(trap *traplapse, operation *trapoperation) {\n    loaded := contra.load()\n    err := trap.snapback(operation).send(loaded);\n\n    \/\/ default error handling\n    \/\/ logging\n    \/\/ boilerplate post-process\n}\n\nfunc resendpolicydevice(trap *traplapse, operation *trapoperation) {\n    loaded := policy.load()\n    err := trap.snapback(operation).send(loaded);\n\n    \/\/ default error handling\n    \/\/ logging\n    \/\/ boilerplate post-process\n}\n\n\/\/ etc.<\/pre>\n
    \u5728\u8fd9\u4e9b\u51fd\u6570\u4e2d\uff0cload()<\/code> \u51fd\u6570\u90fd\u8fd4\u56de\u4e0d\u540c\u7684\u7ed3\u6784\u7c7b\u578b\uff0c\u5e76\u4e14\u5b83\u4eec\u5728\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\u7684\u5176\u4ed6\u5730\u65b9\u4f7f\u7528\u3002<\/p>\n
    \u6211\u5e0c\u671b\u5f97\u5230\u4e00\u4e9b\u6211\u53ef\u4ee5\u62e5\u6709\u7684\u4e1c\u897f\uff1a<\/p>\n
    loaded := fn()\nerr := trap.snapback(operation).send(loaded);\n\n\/\/ default error handling\n\/\/ logging\n\/\/ boilerplate post-process<\/pre>\n
    \u53d1\u9001\u7b7e\u540d\u4e3a\uff0c\u5b83\u63a5\u53d7 interface{}<\/code> \u53c2\u6570\uff1a<\/p>\n
    func (s SnapBack) send(data interface{}) error<\/pre>\n
     <\/p>\n
    \u89e3\u51b3\u65b9\u6848<\/h2>\n
    \u4f8b\u5982\uff0c\u6211\u4e0d\u77e5\u9053\u60a8\u662f\u5426\u53ef\u4ee5\u63a7\u5236
    \ncontra.load()<\/code> \u548c
    \npolicy.load()<\/code> \u7684\u8fd4\u56de\u503c\uff0c\u56e0\u6b64\u53ef\u80fd\u6709\u66f4\u597d\u7684\u65b9\u6cd5\uff0c\u4f46\u5047\u8bbe\u8fd9\u4e9b\u65e0\u6cd5\u4fee\u6539\uff0c\u8fd9\u53ef\u4ee5\u8ba9\u4f60\u6d88\u9664\u5927\u91cf\u7684\u6837\u677f\u6587\u4ef6\uff0c\u800c\u4e0d\u9700\u8981\u4efb\u4f55\u82b1\u54e8\u7684\u64cd\u4f5c\uff1a <\/p>\n
    func boilerplate(tram *traplapse, operation *trapoperation, loader func() interface{}) {\n    loaded := loader()\n    err := trap.snapback(operation).send(loaded);\n\n    \/\/ default error handling\n    \/\/ logging\n    \/\/ boilerplate post-process\n}\n\nfunc resendcontradevice(trap *traplapse, operation *trapoperation) {\n    boilerplate(trap, operation, func() interface{} { return contra.load() })\n}\n\nfunc resendpolicydevice(trap *traplapse, operation *trapoperation) {\n    boilerplate(trap, operation, func() interface{} { return policy.load() })\n}\n<\/pre>\n
    \u5982\u679c\u6ca1\u6709\u66f4\u590d\u6742\u7684\u4e8b\u60c5\uff0c\u60a8\u8fd8\u53ef\u4ee5\u8fdb\u4e00\u6b65\u7b80\u5316\uff1a<\/p>\n
    func boilerplate(tram *TrapLapse, operation *TrapOperation, loaded interface{}) {\n    err := trap.SnapBack(operation).send(loaded);\n\n    \/\/ default error handling\n    \/\/ logging\n    \/\/ boilerplate post-process\n}\n\nfunc resendContraDevice(trap *TrapLapse, operation *TrapOperation) {\n    boilerplate(trap, operation, contra.Load())\n}\n\nfunc resendPolicyDevice(trap *TrapLapse, operation *TrapOperation) {\n    boilerplate(trap, operation, policy.Load())\n}\n<\/pre>\n
    \u4ee5\u4e0a\u5c31\u662f\u300a\u51fd\u6570\u6307\u9488\u4f5c\u4e3a\u201c\u8fd4\u56de\u63a5\u53e3{}\u201d\u7684\u53c2\u6570\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\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-207239","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207239","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=207239"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207239\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}