{"id":207435,"date":"2025-07-08T08:58:43","date_gmt":"2025-07-08T00:58:43","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207435\/"},"modified":"2025-07-08T08:58:43","modified_gmt":"2025-07-08T00:58:43","slug":"unsafe-sizeof-%e8%a1%a8%e7%a4%ba%e4%bb%bb%e4%bd%95%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%83%bd%e9%9c%80%e8%a6%81-16-%e4%b8%aa%e5%ad%97%e8%8a%82%ef%bc%8c%e4%bd%86%e6%98%af%e5%a6%82%e4%bd%95%e5%91%a2%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207435\/","title":{"rendered":"unsafe.SizeOf() \u8868\u793a\u4efb\u4f55\u5b57\u7b26\u4e32\u90fd\u9700\u8981 16 \u4e2a\u5b57\u8282\uff0c\u4f46\u662f\u5982\u4f55\u5462\uff1f"},"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>unsafe.SizeOf() \u8868\u793a\u4efb\u4f55\u5b57\u7b26\u4e32\u90fd\u9700\u8981 16 \u4e2a\u5b57\u8282\uff0c\u4f46\u662f\u5982\u4f55\u5462\uff1f<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-22 16:24:32<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u77e5\u8bc6\u70b9\u638c\u63e1\u4e86\uff0c\u8fd8\u9700\u8981\u4e0d\u65ad\u7ec3\u4e60\u624d\u80fd\u719f\u7ec3\u8fd0\u7528\u3002\u4e0b\u9762\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u4e2aGolang\u5f00\u53d1\u5b9e\u6218\uff0c\u624b\u628a\u624b\u6559\u5927\u5bb6\u5b66\u4e60\u300aunsafe.SizeOf() \u8868\u793a\u4efb\u4f55\u5b57\u7b26\u4e32\u90fd\u9700\u8981 16 \u4e2a\u5b57\u8282\uff0c\u4f46\u662f\u5982\u4f55\u5462\uff1f\u300b\uff0c\u5728\u5b9e\u73b0\u529f\u80fd\u7684\u8fc7\u7a0b\u4e2d\u4e5f\u5e26\u5927\u5bb6\u91cd\u65b0\u6e29\u4e60\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6e29\u6545\u800c\u77e5\u65b0\uff0c\u56de\u5934\u770b\u770b\u8bf4\u4e0d\u5b9a\u53c8\u6709\u4e0d\u4e00\u6837\u7684\u611f\u609f\uff01<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u53ea\u9700\u8fd0\u884c <code>fmt.Println(unsafe.Sizeof(\"\"))<\/code> \u5373\u53ef\u6253\u5370 16\u3002\u66f4\u6539\u5b57\u7b26\u4e32\u7684\u5185\u5bb9\u4e0d\u4f1a\u5f71\u54cd\u7ed3\u679c\u3002<\/p>\n<p>\u6709\u4eba\u80fd\u89e3\u91ca\u4e00\u4e0b\u8fd9\u4e2a\u6570\u5b57\uff0816\uff09\u662f\u600e\u4e48\u6765\u7684\u5417\uff1f<\/p>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>go \u4e2d\u7684\u5b57\u7b26\u4e32\u7531 \u8868\u793a\uff0c\u5176\u4e2d\u5305\u542b\u6307\u5411\u5b9e\u9645\u5b57\u7b26\u4e32\u6570\u636e\u7684\u6307\u9488\u548c\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff1a<\/p>\n<pre>type StringHeader struct {\n        Data uintptr\n        Len  int\n}\n<\/pre>\n<p><code>unsafe.sizeof(s)<\/code> \u5c06\u4ec5\u8fd4\u56de <code>stringheader<\/code> \u7ed3\u6784\u7684\u5927\u5c0f\uff0c\u800c\u4e0d\u8fd4\u56de\u6307\u5411\u7684\u6570\u636e\u672c\u8eab\u3002\u56e0\u6b64\uff08\u5728\u60a8\u7684\u793a\u4f8b\u4e2d\uff09\u5b83\u5c06\u662f <code>data<\/code> \u7684 8 \u4e2a\u5b57\u8282\u548c <code>len<\/code> \u7684 8 \u4e2a\u5b57\u8282\u4e4b\u548c\uff0c\u4f7f\u5176\u6210\u4e3a 16 \u4e2a\u5b57\u8282\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aunsafe.SizeOf() \u8868\u793a\u4efb\u4f55\u5b57\u7b26\u4e32\u90fd\u9700\u8981 16 \u4e2a\u5b57\u8282\uff0c\u4f46\u662f\u5982\u4f55\u5462\uff1f\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":"<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-207435","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207435","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=207435"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207435\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207435"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207435"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}