{"id":46817,"date":"2023-12-11T15:09:54","date_gmt":"2023-12-11T07:09:54","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=46817"},"modified":"2023-12-11T15:09:54","modified_gmt":"2023-12-11T07:09:54","slug":"%e8%af%b7%e4%bd%a0%e8%af%b4%e4%b8%80%e8%af%b4%e6%93%8d%e4%bd%9c%e7%b3%bb%e7%bb%9f%e4%b8%ad%e7%9a%84%e7%bb%93%e6%9e%84%e4%bd%93%e5%af%b9%e9%bd%90%ef%bc%8c%e5%ad%97%e8%8a%82%e5%af%b9%e9%bd%90-3","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/%e8%af%b7%e4%bd%a0%e8%af%b4%e4%b8%80%e8%af%b4%e6%93%8d%e4%bd%9c%e7%b3%bb%e7%bb%9f%e4%b8%ad%e7%9a%84%e7%bb%93%e6%9e%84%e4%bd%93%e5%af%b9%e9%bd%90%ef%bc%8c%e5%ad%97%e8%8a%82%e5%af%b9%e9%bd%90-3\/","title":{"rendered":"\u8bf7\u4f60\u8bf4\u4e00\u8bf4\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u7684\u7ed3\u6784\u4f53\u5bf9\u9f50\uff0c\u5b57\u8282\u5bf9\u9f50"},"content":{"rendered":"

“`” \u53c2\u8003\u56de\u7b54\uff1a<\/p>\n

1\u3001\u539f\u56e0\uff1a<\/p>\n

1\uff09\u5e73\u53f0\u539f\u56e0\uff08\u79fb\u690d\u539f\u56e0\uff09\uff1a\u4e0d\u662f\u6240\u6709\u7684\u786c\u4ef6\u5e73\u53f0\u90fd\u80fd\u8bbf\u95ee\u4efb\u610f\u5730\u5740\u4e0a\u7684\u4efb\u610f\u6570\u636e\u7684\uff1b\u67d0\u4e9b\u786c\u4ef6\u5e73\u53f0\u53ea\u80fd\u5728\u67d0\u4e9b\u5730\u5740\u5904\u53d6\u67d0\u4e9b\u7279\u5b9a\u7c7b\u578b\u7684\u6570\u636e\uff0c\u5426\u5219\u629b\u51fa\u786c\u4ef6\u5f02\u5e38\u3002<\/p>\n

2\uff09\u6027\u80fd\u539f\u56e0\uff1a\u6570\u636e\u7ed3\u6784\uff08\u5c24\u5176\u662f\u6808\uff09\u5e94\u8be5\u5c3d\u53ef\u80fd\u5730\u5728\u81ea\u7136\u8fb9\u754c\u4e0a\u5bf9\u9f50\u3002\u539f\u56e0\u5728\u4e8e\uff0c\u4e3a\u4e86\u8bbf\u95ee\u672a\u5bf9\u9f50\u7684\u5185\u5b58\uff0c\u5904\u7406\u5668\u9700\u8981\u4f5c\u4e24\u6b21\u5185\u5b58\u8bbf\u95ee\uff1b\u800c\u5bf9\u9f50\u7684\u5185\u5b58\u8bbf\u95ee\u4ec5\u9700\u8981\u4e00\u6b21\u8bbf\u95ee\u3002<\/p>\n

2\u3001\u89c4\u5219<\/p>\n

1\uff09\u6570\u636e\u6210\u5458\u5bf9\u9f50\u89c4\u5219\uff1a\u7ed3\u6784(struct)(\u6216\u8054\u5408(union))\u7684\u6570\u636e\u6210\u5458\uff0c\u7b2c\u4e00\u4e2a\u6570\u636e\u6210\u5458\u653e\u5728offset\u4e3a0\u7684\u5730\u65b9\uff0c\u4ee5\u540e\u6bcf\u4e2a\u6570\u636e\u6210\u5458\u7684\u5bf9\u9f50\u6309\u7167#pragma pack\u6307\u5b9a\u7684\u6570\u503c\u548c\u8fd9\u4e2a\u6570\u636e\u6210\u5458\u81ea\u8eab\u957f\u5ea6\u4e2d\uff0c\u6bd4\u8f83\u5c0f\u7684\u90a3\u4e2a\u8fdb\u884c\u3002<\/p>\n

2\uff09\u7ed3\u6784(\u6216\u8054\u5408)\u7684\u6574\u4f53\u5bf9\u9f50\u89c4\u5219\uff1a\u5728\u6570\u636e\u6210\u5458\u5b8c\u6210\u5404\u81ea\u5bf9\u9f50\u4e4b\u540e\uff0c\u7ed3\u6784(\u6216\u8054\u5408)\u672c\u8eab\u4e5f\u8981\u8fdb\u884c\u5bf9\u9f50\uff0c\u5bf9\u9f50\u5c06\u6309\u7167#pragma pack\u6307\u5b9a\u7684\u6570\u503c\u548c\u7ed3\u6784(\u6216\u8054\u5408)\u6700\u5927\u6570\u636e\u6210\u5458\u957f\u5ea6\u4e2d\uff0c\u6bd4\u8f83\u5c0f\u7684\u90a3\u4e2a\u8fdb\u884c\u3002<\/p>\n

3\uff09\u7ed3\u6784\u4f53\u4f5c\u4e3a\u6210\u5458\uff1a\u5982\u679c\u4e00\u4e2a\u7ed3\u6784\u91cc\u6709\u67d0\u4e9b\u7ed3\u6784\u4f53\u6210\u5458\uff0c\u5219\u7ed3\u6784\u4f53\u6210\u5458\u8981\u4ece\u5176\u5185\u90e8\u6700\u5927\u5143\u7d20\u5927\u5c0f\u7684\u6574\u6570\u500d\u5730\u5740\u5f00\u59cb\u5b58\u50a8\u3002<\/p>\n

3\u3001\u5b9a\u4e49\u7ed3\u6784\u4f53\u5bf9\u9f50<\/p>\n

\u53ef\u4ee5\u901a\u8fc7\u9884\u7f16\u8bd1\u547d\u4ee4#pragma pack(n)\uff0cn=1,2,4,8,16\u6765\u6539\u53d8\u8fd9\u4e00\u7cfb\u6570\uff0c\u5176\u4e2d\u7684n\u5c31\u662f\u6307\u5b9a\u7684\u201c\u5bf9\u9f50\u7cfb\u6570\u201d\u3002<\/p>\n

4\u3001\u4e3e\u4f8b<\/p>\n

#pragma pack(2)<\/p>\n

struct AA {<\/p>\n

int a; \/\/\u957f\u5ea64 > 2 \u63092\u5bf9\u9f50\uff1b\u504f\u79fb\u91cf\u4e3a0\uff1b\u5b58\u653e\u4f4d\u7f6e\u533a\u95f4[0,3]<\/p>\n

char b; \/\/\u957f\u5ea61 < 2 \u63091\u5bf9\u9f50\uff1b\u504f\u79fb\u91cf\u4e3a4\uff1b\u5b58\u653e\u4f4d\u7f6e\u533a\u95f4[4]<\/p>\n

short c; \/\/\u957f\u5ea62 = 2 \u63092\u5bf9\u9f50\uff1b\u504f\u79fb\u91cf\u8981\u63d0\u5347\u52302\u7684\u500d\u65706\uff1b\u5b58\u653e\u4f4d\u7f6e\u533a\u95f4[6,7]<\/p>\n

char d; \/\/\u957f\u5ea61 < 2 \u63091\u5bf9\u9f50\uff1b\u504f\u79fb\u91cf\u4e3a7\uff1b\u5b58\u653e\u4f4d\u7f6e\u533a\u95f4[8]\uff1b\u5171\u4e5d\u4e2a\u5b57\u8282<\/p>\n

};<\/p>\n

#pragma pack()<\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” \u53c2\u8003\u56de\u7b54\uff1a 1\u3001\u539f\u56e0\uff1a 1\uff09\u5e73\u53f0\u539f\u56e0\uff08\u79fb\u690d\u539f\u56e0\uff09\uff1a\u4e0d\u662f\u6240\u6709\u7684\u786c\u4ef6\u5e73\u53f0\u90fd\u80fd\u8bbf\u95ee\u4efb […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-46817","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46817","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=46817"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46817\/revisions"}],"predecessor-version":[{"id":46818,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46817\/revisions\/46818"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=46817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=46817"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=46817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}