{"id":46831,"date":"2023-12-11T15:09:57","date_gmt":"2023-12-11T07:09:57","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=46831"},"modified":"2023-12-11T15:09:57","modified_gmt":"2023-12-11T07:09:57","slug":"a-a-new-a-a-i-10%e5%9c%a8%e5%86%85%e6%a0%b8%e4%b8%ad%e7%9a%84%e5%86%85%e5%ad%98%e5%88%86%e9%85%8d%e4%b8%8a%e5%8f%91%e7%94%9f%e4%ba%86%e4%bb%80%e4%b9%88%ef%bc%9f-3","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/a-a-new-a-a-i-10%e5%9c%a8%e5%86%85%e6%a0%b8%e4%b8%ad%e7%9a%84%e5%86%85%e5%ad%98%e5%88%86%e9%85%8d%e4%b8%8a%e5%8f%91%e7%94%9f%e4%ba%86%e4%bb%80%e4%b9%88%ef%bc%9f-3\/","title":{"rendered":"A* a = new A; a->i = 10;\u5728\u5185\u6838\u4e2d\u7684\u5185\u5b58\u5206\u914d\u4e0a\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f"},"content":{"rendered":"

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

1\u3001\u7a0b\u5e8f\u5185\u5b58\u7ba1\u7406\uff1a<\/p>\n

\u4e00\u4e2a\u7a0b\u5e8f\u672c\u8d28\u4e0a\u90fd\u662f\u7531BSS\u6bb5\u3001data\u6bb5\u3001text\u6bb5\u4e09\u4e2a\u7ec4\u6210\u7684\u3002\u53ef\u4ee5\u770b\u5230\u4e00\u4e2a\u53ef\u6267\u884c\u7a0b\u5e8f\u5728\u5b58\u50a8\uff08\u6ca1\u6709\u8c03\u5165\u5185\u5b58\uff09\u65f6\u5206\u4e3a\u4ee3\u7801\u6bb5\u3001\u6570\u636e\u533a\u548c\u672a\u521d\u59cb\u5316\u6570\u636e\u533a\u4e09\u90e8\u5206\u3002<\/p>\n

<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190313\/311436_1552470750551_BF3BB3BB445EFF96BEAE1410CE2CDA74""><\/p>\n

BSS\u6bb5\uff08\u672a\u521d\u59cb\u5316\u6570\u636e\u533a\uff09\uff1a\u901a\u5e38\u7528\u6765\u5b58\u653e\u7a0b\u5e8f\u4e2d\u672a\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\u7684\u4e00\u5757\u5185\u5b58\u533a\u57df\u3002BSS\u6bb5\u5c5e\u4e8e\u9759\u6001\u5206\u914d\uff0c\u7a0b\u5e8f\u7ed3\u675f\u540e\u9759\u6001\u53d8\u91cf\u8d44\u6e90\u7531\u7cfb\u7edf\u81ea\u52a8\u91ca\u653e\u3002<\/p>\n

\u6570\u636e\u6bb5\uff1a\u5b58\u653e\u7a0b\u5e8f\u4e2d\u5df2\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf\u7684\u4e00\u5757\u5185\u5b58\u533a\u57df\u3002\u6570\u636e\u6bb5\u4e5f\u5c5e\u4e8e\u9759\u6001\u5185\u5b58\u5206\u914d<\/p>\n

\u00a0<\/p>\n

\u4ee3\u7801\u6bb5\uff1a\u5b58\u653e\u7a0b\u5e8f\u6267\u884c\u4ee3\u7801\u7684\u4e00\u5757\u5185\u5b58\u533a\u57df\u3002\u8fd9\u90e8\u5206\u533a\u57df\u7684\u5927\u5c0f\u5728\u7a0b\u5e8f\u8fd0\u884c\u524d\u5c31\u5df2\u7ecf\u786e\u5b9a\uff0c\u5e76\u4e14\u5185\u5b58\u533a\u57df\u5c5e\u4e8e\u53ea\u8bfb\u3002\u5728\u4ee3\u7801\u6bb5\u4e2d\uff0c\u4e5f\u6709\u53ef\u80fd\u5305\u542b\u4e00\u4e9b\u53ea\u8bfb\u7684\u5e38\u6570\u53d8\u91cf<\/p>\n

\u00a0<\/p>\n

text\u6bb5\u548cdata\u6bb5\u5728\u7f16\u8bd1\u65f6\u5df2\u7ecf\u5206\u914d\u4e86\u7a7a\u95f4\uff0c\u800cBSS\u6bb5\u5e76\u4e0d\u5360\u7528\u53ef\u6267\u884c\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u5b83\u662f\u7531\u94fe\u63a5\u5668\u6765\u83b7\u53d6\u5185\u5b58\u7684\u3002<\/p>\n

\u00a0<\/p>\n

bss\u6bb5\uff08\u672a\u8fdb\u884c\u521d\u59cb\u5316\u7684\u6570\u636e\uff09\u7684\u5185\u5bb9\u5e76\u4e0d\u5b58\u653e\u5728\u78c1\u76d8\u4e0a\u7684\u7a0b\u5e8f\u6587\u4ef6\u4e2d\u3002\u5176\u539f\u56e0\u662f\u5185\u6838\u5728\u7a0b\u5e8f\u5f00\u59cb\u8fd0\u884c\u524d\u5c06\u5b83\u4eec\u8bbe\u7f6e\u4e3a0\u3002\u9700\u8981\u5b58\u653e\u5728\u7a0b\u5e8f\u6587\u4ef6\u4e2d\u7684\u53ea\u6709\u6b63\u6587\u6bb5\u548c\u521d\u59cb\u5316\u6570\u636e\u6bb5\u3002<\/p>\n

\u00a0<\/p>\n

data\u6bb5\uff08\u5df2\u7ecf\u521d\u59cb\u5316\u7684\u6570\u636e\uff09\u5219\u4e3a\u6570\u636e\u5206\u914d\u7a7a\u95f4\uff0c\u6570\u636e\u4fdd\u5b58\u5230\u76ee\u6807\u6587\u4ef6\u4e2d\u3002<\/p>\n

\u00a0<\/p>\n

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\u00a0<\/p>\n

\u53ef\u6267\u884c\u7a0b\u5e8f\u5728\u8fd0\u884c\u65f6\u53c8\u591a\u51fa\u4e24\u4e2a\u533a\u57df\uff1a\u6808\u533a\u548c\u5806\u533a\u3002<\/p>\n

\u00a0<\/p>\n

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\u00a0<\/p>\n

\u5806\u533a\uff1a\u7528\u4e8e\u52a8\u6001\u5206\u914d\u5185\u5b58\uff0c\u4f4d\u4e8eBSS\u548c\u6808\u4e2d\u95f4\u7684\u5730\u5740\u533a\u57df\u3002\u7531\u7a0b\u5e8f\u5458\u7533\u8bf7\u5206\u914d\u548c\u91ca\u653e\u3002\u5806\u662f\u4ece\u4f4e\u5730\u5740\u4f4d\u5411\u9ad8\u5730\u5740\u4f4d\u589e\u957f\uff0c\u91c7\u7528\u94fe\u5f0f\u5b58\u50a8\u7ed3\u6784\u3002\u9891\u7e41\u7684 malloc\/free\u9020\u6210\u5185\u5b58\u7a7a\u95f4\u7684\u4e0d\u8fde\u7eed\uff0c\u4ea7\u751f\u788e\u7247\u3002\u5f53\u7533\u8bf7\u5806\u7a7a\u95f4\u65f6\u5e93\u51fd\u6570\u662f\u6309\u7167\u4e00\u5b9a\u7684\u7b97\u6cd5\u641c\u7d22\u53ef\u7528\u7684\u8db3\u591f\u5927\u7684\u7a7a\u95f4\u3002\u56e0\u6b64\u5806\u7684\u6548\u7387\u6bd4\u6808\u8981\u4f4e\u7684\u591a\u3002<\/p>\n

2\u3001A* a = new A; a->i = 10\uff1a<\/p>\n

1\uff09A *a\uff1aa\u662f\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\uff0c\u7c7b\u578b\u4e3a\u6307\u9488\uff0c\u6545\u800c\u64cd\u4f5c\u7cfb\u7edf\u5728\u7a0b\u5e8f\u6808\u533a\u5f00\u8f9f4\/8\u5b57\u8282\u7684\u7a7a\u95f4\uff080x000m\uff09\uff0c\u5206\u914d\u7ed9\u6307\u9488a\u3002<\/p>\n

2\uff09new A\uff1a\u901a\u8fc7new\u52a8\u6001\u7684\u5728\u5806\u533a\u7533\u8bf7\u7c7bA\u5927\u5c0f\u7684\u7a7a\u95f4\uff080x000n\uff09\u3002<\/p>\n

3\uff09a = new A\uff1a\u5c06\u6307\u9488a\u7684\u5185\u5b58\u533a\u57df\u586b\u5165\u6808\u4e2d\u7c7bA\u7533\u8bf7\u5230\u7684\u5730\u5740\u7684\u5730\u5740\u3002\u5373*\uff080x000m\uff09=0x000n\u3002<\/p>\n

4\uff09a->i\uff1a\u5148\u627e\u5230\u6307\u9488a\u7684\u5730\u57400x000m\uff0c\u901a\u8fc7a\u7684\u503c0x000n\u548ci\u5728\u7c7ba\u4e2d\u504f\u79fboffset\uff0c\u5f97\u5230a->i\u7684\u5730\u57400x000n + offset\uff0c\u8fdb\u884c*(0x000n + offset) = 10\u7684\u8d4b\u503c\u64cd\u4f5c\uff0c\u5373\u5185\u5b580x000n + offset\u7684\u503c\u662f10\u3002<\/p>\n

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

“`” \u53c2\u8003\u56de\u7b54\uff1a 1\u3001\u7a0b\u5e8f\u5185\u5b58\u7ba1\u7406\uff1a \u4e00\u4e2a\u7a0b\u5e8f\u672c\u8d28\u4e0a\u90fd\u662f\u7531BSS\u6bb5\u3001data\u6bb5\u3001te […]<\/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-46831","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46831","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=46831"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46831\/revisions"}],"predecessor-version":[{"id":46832,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46831\/revisions\/46832"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=46831"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=46831"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=46831"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}