{"id":2763,"date":"2022-08-19T02:08:22","date_gmt":"2022-08-18T18:08:22","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=2763"},"modified":"2022-08-28T02:51:41","modified_gmt":"2022-08-27T18:51:41","slug":"c%e6%8c%87%e9%92%88%ef%bc%8c%e5%b7%a6%e5%80%bc%e5%bc%95%e7%94%a8%ef%bc%8c%e5%8f%b3%e5%80%bc%e5%bc%95%e7%94%a8%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=2763","title":{"rendered":"C++\u6307\u9488\uff0c\u5de6\u503c\u5f15\u7528\uff0c\u53f3\u503c\u5f15\u7528\u8be6\u89e3"},"content":{"rendered":"\n<p>C\u8bed\u8a00\u6709 <strong>\u6307\u9488<\/strong>\uff0c\u800c C++ \u6709<strong>\u5f15\u7528<\/strong>\uff0c\u90a3 <strong>\u5f15\u7528<\/strong> \u8ddf <strong>\u6307\u9488<\/strong> \u662f\u4e0d\u662f\u4e00\u4e2a\u4e1c\u897f\uff0c\u672c\u6587\u4f1a\u4ece \u6c47\u7f16\u7684\u89d2\u5ea6 \u6765\u5206\u6790\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u6307\u9488\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\nint main()\n{\n    int a = 999;\n    int* p_a = &amp;a;\n    printf(&quot;data: %d\\n&quot;, *p_a);\n}\n\u200b<\/code><\/pre>\n\n\n\n<p>\u5f15\u7528\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\nint main()\n{\n    int a = 999;\n    int &amp;p_a = a;\n    printf(&quot;data: %d\\n&quot;, p_a);\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u6211\u4eec\u7528 vs2019 \u6765\u7f16\u8bd1\u8c03\u8bd5\u4e00\u4e0b\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u76f4\u63a5\u8c03\u51fa\u6765 \u6c47\u7f16\u7a97\u53e3\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1021\" height=\"656\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-1.png\" alt=\"\" class=\"wp-image-2808\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-1.png 1021w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-1-300x193.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-1-768x493.png 768w\" sizes=\"auto, (max-width: 1021px) 100vw, 1021px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"666\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/1-2-1024x666.png\" alt=\"\" class=\"wp-image-2765\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/1-2-1024x666.png 1024w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/1-2-300x195.png 300w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/1-2-768x499.png 768w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/1-2.png 1029w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u53ef\u4ee5\u770b\u51fa\uff0c\u5f15\u7528 \u8ddf \u6307\u9488 \u7f16\u8bd1\u51fa\u6765\u7684\u6c47\u7f16\u4ee3\u7801\u662f\u4e00\u6837\u7684\uff0c\u6c47\u7f16\u4ee3\u7801\u7684\u529f\u80fd\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>1\uff0c\u628a 3E7 \uff0810\u8fdb\u5236\u662f999\uff09\u590d\u5236\u7ed9 a \u53d8\u91cf\u3002<\/p>\n\n\n\n<p>2\uff0c\u628a a \u53d8\u91cf\u7684\u5185\u5b58\u5730\u5740 \u590d\u5236\u5230 <code class=\"prettyprint\" >eax<\/code> \u5bc4\u5b58\u5668\u3002<\/p>\n\n\n\n<p>3\uff0c\u628a <code class=\"prettyprint\" >eax<\/code> \u5bc4\u5b58\u5668\u7684\u503c \u590d\u5236\u5230 p_a \u53d8\u91cf\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4e0b\u9762\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b\uff0c\u51fd\u6570\u91cc\u9762 \u7528 \u5f15\u7528\u4f20\u53c2 \u8ddf \u6307\u9488\u4f20\u53c2\uff0c\u751f\u6210\u7684\u6c47\u7f16\u4ee3\u7801\u6709\u4ec0\u4e48\u533a\u522b\u3002<\/p>\n\n\n\n<p><strong>\u6307\u9488\u4ee3\u7801\u5982\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\u200b\n#include &lt;iostream&gt;\n\u200b\nvoid do_something(int* p_a) {\n    printf(&quot;data: %d\\n&quot;, p_a);\n}\n\u200b\nint main()\n{\n    int a = 999;\n    int* p_a = &amp;a;\n    do_something(p_a);\n}\n\u200b<\/code><\/pre>\n\n\n\n<p><strong>\u5f15\u7528\u4ee3\u7801\u5982\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\n\u200b\nvoid do_something(int&amp; p_a) {\n    printf(&quot;data: %d\\n&quot;, p_a);\n}\n\u200b\nint main()\n{\n    int a = 999;\n    int&amp; p_a = a;\n    do_something(p_a);\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u7f16\u8bd1\u4e4b\u540e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-3.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-4.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u751f\u6210\u7684\u6c47\u7f16\u4ee3\u7801\uff0c\u4f9d\u7136\u662f\u5b8c\u5168\u4e00\u6837\u7684\u3002\u6240\u4ee5\u4ece\u6c47\u7f16\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u5f15\u7528\u8ddf\u6307\u9488\u5b9e\u9645\u4e0a\u5c31\u662f\u540c\u4e00\u4e2a\u4e1c\u897f\u3002<\/p>\n\n\n\n<p>\u5f15\u7528 \u8ddf \u6307\u9488\uff0c\u66f4\u591a\u7684\u662f\u7c7b\u578b\u7cfb\u7edf\uff0c\u7f16\u7a0b\u8bed\u8a00\u8bed\u6cd5 \u65b9\u9762\u7684\u8bbe\u8ba1\uff0c\u4e5f\u5c31\u662f\u7531\u7f16\u8bd1\u5668\u641e\u51fa\u6765\u7684\u6982\u5ff5\uff0c\u5b9e\u9645\u4e0a\u4ed6\u4eec\u6700\u540e\u751f\u6210\u7684\u6c47\u7f16\u4ee3\u7801\u662f\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n<p>\u8f6f\u4ef6\u7a0b\u5e8f\u7684\u5e95\u5c42\u5c31\u662f\u673a\u5668\u7801\uff0c\u673a\u5668\u7801\u4e5f\u53eb\u505a CPU \u7684\u6307\u4ee4\u96c6\u3002\u65e0\u8bba\u662f\u4ec0\u4e48\u6837\u7684\u7f16\u7a0b\u8bed\u8a00\uff0cC\/C++\uff0cRUST\uff0cGo\uff0c\u7b49\u7b49\uff0c\u4ed6\u4eec\u80fd\u5b9e\u73b0\u7684\u529f\u80fd\uff0c\u4f60\u7528\u6c47\u7f16\u4e00\u6837\u80fd\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p>\u800c\u90a3\u4e9b\u6240\u8c13\u7684\u53d8\u91cf\uff0c\u5bf9\u8c61\uff0c\u90fd\u53ea\u662f\u4e00\u6bb5\u5185\u5b58\u6570\u636e\uff0cCPU\u6307\u4ee4 \u5c31\u662f\u5bf9 \u5185\u5b58\u6570\u636e\u8fdb\u884c\u8ba1\u7b97\uff0c\u64cd\u4f5c\u3002\u6240\u4ee5 \u6240\u6709\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u6216\u8005\u5bf9\u8c61\uff0c\u4ed6\u4eec\u4ece\u6c47\u7f16\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u4ed6\u4eec\u7684\u65b9\u6cd5\u90fd\u662f\u4e00\u6837\u7684\uff0c\u867d\u7136 <code class=\"prettyprint\" >int<\/code> \u8ddf <code>char<\/code> \u5728\u9ad8\u7ea7\u8bed\u8a00\u5c42\u9762\u7684\u64cd\u4f5c\u65b9\u6cd5\u4e0d\u4e00\u6837\uff0c\u4f46\u662f\u4ed6\u4eec\u90fd\u662f\u4e00\u6bb5\u5185\u5b58\uff0c\u4ece\u6c47\u7f16\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u600e\u4e48\u64cd\u4f5c\u90fd\u53ef\u4ee5\u3002<code>int<\/code> \u53d8\u91cf\u7684\u5185\u5b58\u80fd\u8fdb\u884c X \u64cd\u4f5c\uff0c<code>char<\/code> \u7684\u5185\u5b58\u4e5f\u80fd\u8fdb\u884c X \u64cd\u4f5c\u3002\u8fd9\u91cc X \u6cdb\u6307\u67d0\u79cd\u64cd\u4f5c\/\u65b9\u6cd5\uff0c\u4f8b\u5982\u53cd\u8f6c\u5185\u5b58\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u5982\u679c\u4f60\u5728 C \u8bed\u8a00\u5c42\u9762\u968f\u610f\u6df7\u7528 <code class=\"prettyprint\" >int<\/code> \u8ddf <code>char<\/code> \u7684\u64cd\u4f5c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u95ee\u9898\uff0c\u4f8b\u5982 <code>strlen()<\/code> \u51fd\u6570\u4f20\u4e86 <code>int<\/code> \u8fdb\u53bb\u3002\u67d0\u4e9b\u6df7\u7528\u7684\u573a\u666f\uff0c\u4f1a\u76f4\u63a5\u5bfc\u81f4\u7f16\u8bd1\u5668\u62a5\u9519\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u7f16\u7a0b\u8bed\u8a00\u8bed\u6cd5\uff0c\u7c7b\u578b\u7cfb\u7edf\uff0c\u505a\u7684\u4e8b\u60c5\uff0c\u5c31\u662f\u9650\u5236\u4f60\u968f\u610f\u64cd\u4f5c\u5185\u5b58\uff0c\u672c\u6765\u4f60\u7528\u6c47\u7f16\u4ec0\u4e48\u90fd\u80fd\u5e72\uff0c\u4f46\u662f\u4e5f\u5bb9\u6613\u5e72\u9519\u5f88\u591a\u4e8b\u60c5\u3002\u6240\u4ee5\u7c7b\u578b\u7cfb\u7edf\uff0c\u7f16\u7a0b\u8bed\u6cd5 \u5b9e\u9645\u4e0a\u662f\u5bf9\u5185\u5b58\u4f7f\u7528\u7684\u4e00\u79cd\u9650\u5236\uff0c\u9632\u6b62\u7a0b\u5e8f\u5458\u72af\u9519\u3002\u628a\u8fd0\u884c\u65f6\u9519\u8bef\u8f6c\u6362\u6210\u7f16\u8bd1\u578b\u9519\u8bef\uff0c\u8fd9\u6837\u4f60\u80fd\u63d0\u524d\u6539\u6b63\u9519\u8bef\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4e0a\u9762\u7684\u5f15\u7528\uff0c\u51c6\u786e\u6765\u8bf4 \u662f\u6307 \"<strong>\u5de6\u503c\u5f15\u7528<\/strong>\"\uff0cC++ \u91cc\u9762\u8fd8\u6709\u4e00\u4e2a<strong>\u53f3\u503c\u5f15\u7528<\/strong>\u7684\u7528\u6cd5\uff0c\u521d\u5b66\u8005\u521a\u5b66 C++ \u4f1a\u89c9\u5f97\u53f3\u503c\u5f15\u7528 \u975e\u5e38\u53cd\u4eba\u7c7b\uff0c\u4e0d\u597d\u7406\u89e3\u3002<\/p>\n\n\n\n<p>\u672c\u6587\u5e0c\u671b\u4ece\u6c47\u7f16\u89d2\u5ea6\u6765\u7ed9\u8bfb\u8005\u8bb2\u89e3\uff0c\u5982\u679c\u6ca1\u7528 \u53f3\u503c\u5f15\u7528\uff0c\u751f\u6210\u7684\u6c47\u7f16\u662f\u600e\u6837\u7684\uff0c\u5982\u679c\u7528\u4e86\u53f3\u503c\u5f15\u7528\uff0c\u751f\u6210\u7684\u6c47\u7f16\u53c8\u662f\u600e\u6837\u7684\uff1f<\/p>\n\n\n\n<p>\u4ece\u6c47\u7f16\u7684\u89d2\u5ea6\u4f1a\u66f4\u5bb9\u6613\u7406\u89e3\u53f3\u503c\u5f15\u7528\u7684\u610f\u4e49\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u622a\u56fe\u4e00\u4e0b\u300aC++ Primer\u300b\u5bf9\u53f3\u503c\u5f15\u7528\u7684\u9610\u8ff0\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-5.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u6211\u4eec\u6765\u4e2a\u6700\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u770b\u770b\u53f3\u503c\u5f15\u7528\u4f1a\u7ffb\u8bd1\u6210\u4ec0\u4e48\u6837\u7684\u6c47\u7f16\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\n\u200b\nint main()\n{\n    int&amp;&amp; a = 999;\n}<\/code><\/pre>\n\n\n\n<p>\u63d0\u793a\uff1a\u4e0d\u52fe\u9009 <code class=\"prettyprint\" >Show symbol names<\/code> \uff0c\u5c31\u53ef\u4ee5\u770b\u5230\u6700\u539f\u59cb\u7684\u673a\u5668\u7801\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-6.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u5207\u6362\u52fe\u9009 <code class=\"prettyprint\" >Show symbol names<\/code>\uff0c\u4f1a\u53d1\u73b0\u4e0a\u9762\u7684 <code>[ebp-0Ch]<\/code> \u5b9e\u9645\u4e0a\u5c31\u662f a \u53d8\u91cf\uff0c\u5982\u4e0b\uff0c\u800c <code>[ebp-18h]<\/code> \u53ef\u4ee5\u770b\u6210\u662f\u4e00\u4e2a\u6ca1\u6709\u540d\u79f0\u7684\u53d8\u91cf\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-6-1-1024x574.png\" alt=\"\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u5982\u679c\u6211\u4eec\u4e0d\u7528 <code class=\"prettyprint\" >&amp;&amp;<\/code>\uff0c\u76f4\u63a5 \u628a a \u8d4b\u503c\u4e3a 999\uff0c\u751f\u6210\u7684\u6c47\u7f16\u53c8\u4f1a\u600e\u6837\u5462\uff1f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-7.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u4e24\u8005\u751f\u6210\u7684\u6c47\u7f16\u662f\u6709\u6240\u4e0d\u540c\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int&amp;&amp; a = 999;\n\u88ab\u7ffb\u8bd1\u4e3a 3 \u53e5\u6c47\u7f16\nmov dword ptr &#091;ebp-18h],3E7h\nlea eax,&#091;ebp-18h]\nmov dword ptr &#091;ebp-0Ch],eax\n\u200b\nint a = 999;\n\u88ab\u7ffb\u8bd1\u4e3a\nmov dword ptr &#091;ebp-8],3E7h<\/code><\/pre>\n\n\n\n<p>\u5bf9\u4e8e\u4e0d\u719f\u6089\u6c47\u7f16\u7684\u540c\u5b66\uff0c\u6211\u5148\u8bb2\u89e3\u4e00\u4e9b\u8fd9\u51e0\u53e5\u6c47\u7f16\u7684\u542b\u4e49\u3002\u9996\u5148\u3002<\/p>\n\n\n\n<p>1\uff0c<code class=\"prettyprint\" >dword<\/code> \u7684\u5168\u79f0\u662f <code>Double Word<\/code>\uff0c<code>Word<\/code> \u672c\u8eab\u4ee3\u8868 2\u4e2a\u5b57\u8282\u957f\u5ea6\uff0c\u52a0\u4e0a <code>Double<\/code> \u6240\u4ee5\u662f 4 \u4e2a\u5b57\u8282\u3002<\/p>\n\n\n\n<p>2\uff0c<code class=\"prettyprint\" >ptr<\/code> \u7684\u5168\u79f0\u662f <code>pointer<\/code> \uff0c\u5373\u6307\u9488\uff0c<\/p>\n\n\n\n<p>\u6240\u4ee5 <code class=\"prettyprint\" >mov dword ptr [ebp-18h],3E7h<\/code> \u7684\u542b\u4e49\u5c31\u662f\uff0c\u628a <code>3E7h<\/code> \u590d\u5236\u5230 <code>[ebp-18h]<\/code> \u6307\u5411\u7684 4 \u5b57\u8282\u5185\u5b58\u7684\u4f4d\u7f6e\u3002\u5047\u5982 <code>ebp<\/code> \u662f <code>0x00E5FEB8<\/code> \uff0c<\/p>\n\n\n\n<p>\u90a3 <code class=\"prettyprint\" >0x00E5FEB8-18h = 0x00E5FEA0<\/code> \uff0c\u90a3 0x00E5FEA0 ~ 0x00E5FEA3 \u8fd9 4 \u4e2a\u5b57\u8282\u7684\u5185\u5b58\u6570\u636e\u5c31\u662f 999\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >[ebp-18h]<\/code> \u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u533f\u540d\u53d8\u91cf\uff0c\u5bf9\u6bd4\u6211\u4eec\u521a\u5f00\u59cb\u7684\u5de6\u503c\u5f15\u7528\u4f8b\u5b50\uff0c<code>int a = 999; int &amp;p_a = a;<\/code>\uff0c\u53f3\u503c\u5f15\u7528\u7684\u8d4b\u503c\u65b9\u6cd5\uff0c\u7f16\u8bd1\u5668\u81ea\u5df1\u521b\u5efa\u4e86 \u4e00\u4e2a\u533f\u540d\u53d8\u91cf\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u800c <code class=\"prettyprint\" >lea eax,[ebp-18h]<\/code> \u7684\u610f\u4e49\u662f\u628a <code>[ebp-18h]<\/code> \u76f4\u63a5\u590d\u5236\u7ed9 <code>eax<\/code>\uff0c\u6240\u4ee5 <code>eax<\/code> \u662f <code>0x00E5FEA0<\/code>\uff0c\u800c\u4e0d\u662f <code>999<\/code>\u3002<\/p>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c\u53f3\u503c\u5f15\u7528\u6700\u540e \u8fd8\u4f1a\u628a <code class=\"prettyprint\" >eax<\/code> \u590d\u5236\u7ed9 <code>[ebp-0Ch]<\/code> \uff0c\u4e5f\u5c31\u662f <code>0x00E5FEAC<\/code> \u6307\u5411\u7684\u5185\u5b58\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u5b9e\u9645\u8c03\u8bd5\u4e00\u4e0b\uff0c\u770b\u4e0b\u5185\u5b58\u6570\u636e\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-8.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-1-9.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-2-1-1024x742.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-2-2-1024x761.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u7684\u8c03\u8bd5\u6b65\u594f\u6765\u770b\uff0c\u53f3\u503c\u5f15\u7528\u91cc\u9762\uff0c\u53d8\u91cf a \u662f <code class=\"prettyprint\" >[ebp-0Ch]<\/code> \uff0c\u4e5f\u5c31\u662f <code>0x00E5FEAC<\/code> \uff0c\u800c <code>0x00E5FEAC<\/code> \u6307\u5411\u7684\u5185\u5b58\u4e0d\u662f 999\uff0c\u800c\u662f <code>0x00E5FEA0<\/code>\uff0c\u800c <code>0x00E5FEA0<\/code> \u6307\u5411\u7684\u5185\u5b58\u6570\u636e\u624d\u662f 999\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u6211\u4eec\u4e0d\u7528\u53f3\u503c\u5f15\u7528\uff0c\u53d8\u91cf a \u662f <code class=\"prettyprint\" >[ebp-8]<\/code>\uff0c<code>[ebp-8]<\/code> \u6307\u5411\u7684\u5185\u5b58\u5c31\u662f 999\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u53f3\u503c\u5f15\u7528\u5b9e\u9645\u4e0a\u662f\u4ec0\u4e48\u5462\uff1f\u5b9e\u9645\u4e0a\u5c31\u662f\u4e00\u7ea7\u6307\u9488\uff0c\u4e3a\u4e86\u9a8c\u8bc1\u8fd9\u4e2a\u4e8b\u60c5\uff0c\u6211\u4eec\u628a\u53f3\u503c\u6539\u6210 \u4e00\u7ea7\u6307\u9488\u5199\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\n\u200b\nint main()\n{\n    int nobody = 999;\n    int* a = &amp;nobody;\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\uff0c\u6211\u5b9a\u4e49\u4e86\u4e00\u4e2a nobody \u53d8\u91cf\uff0c\u6765\u6a21\u62df \u53f3\u503c\u5f15\u7528\u91cc\u9762 \u7f16\u8bd1\u5668\u81ea\u5df1\u521b\u5efa\u7684 <strong>\u533f\u540d\u53d8\u91cf<\/strong>\u3002\u7f16\u8bd1\u8c03\u8bd5\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-2-3-1024x536.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u4e00\u7ea7\u6307\u9488 \u751f\u6210\u7684\u4ee3\u7801\uff0c\u8ddf \u53f3\u503c\u5f15\u7528\u662f\u51e0\u4e4e\u4e00\u6837\uff0c\u53ea\u662f\u53d8\u91cf\u5728\u6808\u7684\u4f4d\u7f6e\u4e0d\u592a\u4e00\u6837\uff0c\u4e00\u4e2a\u5411\u4e0a\uff0c\u4e00\u4e2a\u5411\u4e0b\uff0c\u8fd9\u4e2a\u65e0\u5173\u7d27\u8981\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u5f97\u51fa\u7ed3\u8bba\uff0c\u53f3\u503c\u5f15\u7528 \u7684\u5e95\u5c42\u903b\u8f91\uff0c\u5c31\u662f\u4e00\u7ea7\u6307\u9488\u3002<\/p>\n\n\n\n<p>\u6269\u5c55\u77e5\u8bc6\uff1a\u300aC++ Primer\u300b\u63d0\u5230 <strong>\u53f3\u503c\u662f\u4e34\u65f6\u73b0\u8c61<\/strong>\uff0c\u5b9e\u9645\u4e0a\u6307\u7684\u5c31\u662f\u90a3\u4e2a nobody \u533f\u540d\u53d8\u91cf\uff0c\u6ca1\u6709\u540d\u79f0\u7684\u53d8\u91cf\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u6211\u4eec\u518d\u6765\u770b\u53f3\u503c\u5f15\u7528\u7684\u4e00\u4e2a\u590d\u6742\u7684\u4f8b\u5b50\uff0cC++ \u63d0\u4f9b\u4e86 <code class=\"prettyprint\" >std::move()<\/code>\uff0c\u6211\u4eec\u7528\u8fd9\u4e2a <code>move<\/code> \u51fd\u6570\u6765\u6f14\u793a\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\nclass Box\n{\npublic:\n    int length;   \/\/ \u76d2\u5b50\u7684\u957f\u5ea6\n    int breadth;  \/\/ \u76d2\u5b50\u7684\u5bbd\u5ea6\n    int height;   \/\/ \u76d2\u5b50\u7684\u9ad8\u5ea6\n};\nint main()\n{\n    Box b1;\n    b1.length = 10;\n    b1.breadth = 20;\n    b1.height = 30;\n    Box b2 = b1;\n    b1.length = 55;\n    printf(&quot;b2.length = %d \\n&quot;, b2.length);\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u8fd0\u884c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-2-4.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0cb2 \u5e76\u6ca1\u6709\u53d7\u5230 b1 \u8d4b\u503c\u7684\u5f71\u54cd\uff0c\u6240\u4ee5 <code class=\"prettyprint\" >b2.length<\/code> \u7b49\u4e8e 10\uff0c\u800c\u4e0d\u662f 55\u3002\u56e0\u6b64 b1 \u53d8\u91cf \u8ddf b2 \u53d8\u91cf\u5b9e\u9645\u4e0a\u662f\u4e24\u5757\u4e0d\u540c\u7684\u5185\u5b58\u3002\u8fd9\u53eb\u505a\u62f7\u8d1d\u8d4b\u503c<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4e0b\u9762\u6211\u4eec\u7528 <code class=\"prettyprint\" >std::move()<\/code> \u6765\u8d4b\u503c b2 \uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\nclass Box\n{\npublic:\n    int length;   \/\/ \u76d2\u5b50\u7684\u957f\u5ea6\n    int breadth;  \/\/ \u76d2\u5b50\u7684\u5bbd\u5ea6\n    int height;   \/\/ \u76d2\u5b50\u7684\u9ad8\u5ea6\n};\nint main()\n{\n    Box b1;\n    b1.length = 10;\n    b1.breadth = 20;\n    b1.height = 30;\n\tBox&amp;&amp; b2 = std::move(b1);\n    b1.length = 55;\n    printf(&quot;b2.length = %d \\n&quot;, b2.length);\n}<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-2-5.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230 b2 \u53d7\u5230\u4e86 b1 \u8d4b\u503c\u7684\u5f71\u54cd\uff0c\u6240\u4ee5\u4ed6\u4eec\u5df2\u7ecf\u6307\u5411\u540c\u4e00\u5757\u5185\u5b58\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u5b9e\u9645\u4e0a\u4e0a\u9762\u7684\u4ee3\u7801\u7b49\u4ef7\u4e0e \u4e00\u7ea7\u6307\u9488\u7684\u5199\u6cd5\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-2-6.png\" alt=\"\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u6240\u4ee5\u53f3\u503c\u5f15\u7528 \uff0cmove \u51fd\u6570\u7684\u672c\u8d28\u662f\u4ec0\u4e48\u5462\uff1f\u5b9e\u9645\u4e0a\u5c31\u662f\u53d6\u5730\u5740\uff0c\u590d\u5236\u5730\u5740\uff0c\u51cf\u5c11\u62f7\u8d1d\u3002<\/p>\n\n\n\n<p>\u6211\u4e2a\u4eba\u7684\u7406\u89e3\u662f\u8fd9\u6837\u7684\uff0c\u867d\u7136 C++ \u662f\u517c\u5bb9 C \u8bed\u8a00\u7684\uff0c\u6240\u4ee5\u4f60\u53ef\u4ee5\u7528 \u4e00\u7ea7\u6307\u9488\uff0c\u4e8c\u7ea7\u6307\u9488\uff0c\u4f46\u662f C++ \u59d4\u5458\u4f1a\u8c8c\u4f3c\u4e00\u76f4\u60f3\u5728 C++ \u91cc\u9762\u53bb\u6389 \u6307\u9488\u7684\u7528\u6cd5\uff0c\u6240\u4ee5\u4ed6\u4eec\u53d1\u660e\u4e86 \u53f3\u503c\u5f15\u7528 \u8ddf move\uff0c\u5b9e\u9645\u5c31\u662f\u4e3a\u4e86 \u533a\u5206 <strong>\u62f7\u8d1d<\/strong> \u8ddf <strong>\u79fb\u52a8<\/strong> \u8fd9\u4e24\u4e2a\u64cd\u4f5c\u3002\u79fb\u52a8\u5b9e\u9645\u4e0a\u5c31\u662f\u53d6\u5730\u5740\uff0c\u7136\u540e\u628a\u5730\u5740\u653e\u5230\u53e6\u4e00\u4e2a\u53d8\u91cf\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u53ef\u4ee5\u628a \u53f3\u503c\u5f15\u7528 \u770b\u6210 \u662f\u6307\u9488\u7684\u66ff\u4ee3\u54c1\u3002\u4f46\u6211\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u6307\u9488\u6bd4\u53f3\u503c\u5f15\u7528\u5bb9\u6613\u4f7f\u7528\u5f88\u591a\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u8bed\u8a00\u6709 \u6307\u9488\uff0c\u800c C++ 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