{"id":207934,"date":"2025-07-08T13:01:47","date_gmt":"2025-07-08T05:01:47","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207934\/"},"modified":"2025-07-08T13:01:47","modified_gmt":"2025-07-08T05:01:47","slug":"%e5%8c%bf%e5%90%8d-%e6%98%be%e5%bc%8f%e5%9c%a8%e7%bb%93%e6%9e%84%e4%b8%ad%e5%b5%8c%e5%85%a5%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207934\/","title":{"rendered":"\u533f\u540d\/\u663e\u5f0f\u5728\u7ed3\u6784\u4e2d\u5d4c\u5165\u63a5\u53e3"},"content":{"rendered":"<p><b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>\u533f\u540d\/\u663e\u5f0f\u5728\u7ed3\u6784\u4e2d\u5d4c\u5165\u63a5\u53e3<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-26 22:45:37<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u533f\u540d\/\u663e\u5f0f\u5728\u7ed3\u6784\u4e2d\u5d4c\u5165\u63a5\u53e3\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">Golang<\/span>\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<pre>type A interface {\n    f()\n}\n\ntype B struct {\n    A\n}\n\ntype C struct {\n    Imp A\n}\n\nfunc main() {\n    b := B{}\n    c := C{}\n    \/\/b can be directly assigned to the A interface, but c prompts that it cannot be assigned\n    var ab A = b\n    \/\/Cannot use 'c' (type C) as type A in assignment Type does not implement 'A' as some methods are missing: f() \n    var ac A = c\n}<\/pre>\n<p>b \u7ed3\u6784\u548c c \u7ed3\u6784\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f<\/p>\n<p>\u5728 go \u5de5\u4f5c\u8868\u4e2d<\/p>\n<p> \u4f7f\u7528\u7c7b\u578b\u58f0\u660e\u4f46\u6ca1\u6709\u663e\u5f0f\u5b57\u6bb5\u540d\u79f0\u7684\u5b57\u6bb5\u79f0\u4e3a\u5d4c\u5165\u5b57\u6bb5\u3002\u5d4c\u5165\u5b57\u6bb5\u5fc5\u987b\u6307\u5b9a\u4e3a\u7c7b\u578b\u540d\u79f0 t \u6216\u6307\u5411\u975e\u63a5\u53e3\u7c7b\u578b\u540d\u79f0 *t \u7684\u6307\u9488\uff0c\u5e76\u4e14 t \u672c\u8eab\u53ef\u80fd\u4e0d\u662f\u6307\u9488\u7c7b\u578b\u3002\u975e\u9650\u5b9a\u7c7b\u578b\u540d\u79f0\u5145\u5f53\u5b57\u6bb5\u540d\u79f0\u3002 <\/p>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>\u5982\u679c\u60a8\u7ee7\u7eed\u9605\u8bfb\u89c4\u8303\u7684\u540c\u4e00\u4e2a \uff0c\u60a8\u4f1a\u6ce8\u610f\u5230\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u7ed3\u6784\u7c7b\u578b S \u548c\u4e00\u4e2a\u5b9a\u4e49\u7684\u7c7b\u578b T\uff0c\u63d0\u5347\u7684\u65b9\u6cd5\u662f \u5305\u542b\u5728\u8be5\u7ed3\u6784\u4f53\u7684\u65b9\u6cd5\u96c6\u4e2d\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u5982\u679c S \u5305\u542b\u5d4c\u5165\u5b57\u6bb5 T\uff0c\u5219 S \u548c *S \u7684\u65b9\u6cd5\u96c6\u90fd\u662f \u5305\u62ec\u63a5\u6536\u8005 T \u7684\u63d0\u5347\u65b9\u6cd5\u3002 *S \u7684\u65b9\u6cd5\u96c6\u4e5f \u5305\u62ec\u5e26\u6709\u63a5\u6536\u5668 *T \u7684\u5347\u7ea7\u65b9\u6cd5\u3002<\/li>\n<li>\u5982\u679c S \u5305\u542b\u5d4c\u5165\u7684 \u5b57\u6bb5*T\uff0cS\u548c*S\u7684\u65b9\u6cd5\u96c6\u90fd\u5305\u542b\u63d0\u5347\u7684\u65b9\u6cd5 \u4e0e\u63a5\u6536\u5668 T \u6216 *T\u3002<\/li>\n<\/ul>\n<p>\u60a8\u7684\u7ed3\u6784 <code>B<\/code> \u6ca1\u6709\u663e\u5f0f\u5b9a\u4e49\u7684\u65b9\u6cd5\uff0c\u4f46 <strong><code>B<\/code> \u7684\u65b9\u6cd5\u96c6\u9690\u5f0f\u5305\u542b\u6765\u81ea\u5d4c\u5165\u5b57\u6bb5\u7684\u63d0\u5347\u65b9\u6cd5<\/strong>\u3002\u5728\u672c\u4f8b\u4e2d\uff0c\u5d4c\u5165\u5b57\u6bb5\u662f\u65b9\u6cd5 <code>f()<\/code> \u7684\u63a5\u53e3\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u6ee1\u8db3\u8be5\u63a5\u53e3\u7684\u4efb\u4f55\u5bf9\u8c61\uff0c\u5176 <code>f()<\/code> \u65b9\u6cd5\u5c06\u81ea\u52a8\u6210\u4e3a <code>B<\/code> \u65b9\u6cd5\u96c6\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<p>\u53e6\u4e00\u65b9\u9762\uff0c\u60a8\u7684 <code>C<\/code> \u7ed3\u6784\u6709\u4e00\u4e2a\u547d\u540d\u5b57\u6bb5\u3002 <strong><code>Imp<\/code> \u4e0a\u7684\u65b9\u6cd5\u4e0d\u4f1a\u81ea\u52a8\u6dfb\u52a0\u5230 <code>C<\/code> \u7684\u65b9\u6cd5\u96c6\u4e2d<\/strong>\u3002\u76f8\u53cd\uff0c\u8981\u4ece <code>Imp<\/code> \u8bbf\u95ee <code>f()<\/code> \u65b9\u6cd5\uff0c\u60a8\u9700\u8981\u4e13\u95e8\u8c03\u7528 <code>C.Imp.f()<\/code>\u3002<\/p>\n<p>\u6700\u540e\uff1a\u60a8\u4f7f\u7528\u63a5\u53e3\u4f5c\u4e3a\uff08\u5d4c\u5165\u4e0e\u5426\uff09\u5b57\u6bb5\u7684\u4e8b\u5b9e\u5e76\u4e0d\u91cd\u8981\uff0c\u5b83\u5f88\u53ef\u80fd\u662f\u53e6\u4e00\u4e2a\u5177\u6709 <code>f()<\/code> \u65b9\u6cd5\u7684\u7ed3\u6784\u3002 <strong>\u91cd\u8981\u7684\u662f<code>f()<\/code>\u662f\u5426\u6210\u4e3a\u7236\u7ed3\u6784\u4f53\u65b9\u6cd5\u96c6\u7684\u4e00\u90e8\u5206\uff0c\u8fd9\u5c06\u5141\u8bb8\u5b83\u5b9e\u73b0<code>A<\/code>\u6216\u4e0d\u5b9e\u73b0\u3002<\/strong><\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u533f\u540d\/\u663e\u5f0f\u5728\u7ed3\u6784\u4e2d\u5d4c\u5165\u63a5\u53e3\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u524d\u4f4d\u7f6e\uff1a &gt; &gt; &#46;&#46;&#46;<\/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-207934","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207934","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=207934"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207934\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207934"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207934"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207934"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}