{"id":611,"date":"2026-09-18T16:31:52","date_gmt":"2026-09-18T08:31:52","guid":{"rendered":"https:\/\/cookie-qwq.xyz\/?p=611"},"modified":"2026-09-18T19:06:49","modified_gmt":"2026-09-18T11:06:49","slug":"%e9%ab%98%e7%ba%a7%e6%8c%87%e9%92%884-%e6%b2%a1%e6%9c%89%e7%b1%bb%e5%9e%8b%ef%bc%88void%ef%bc%89%e7%9a%84%e6%8c%87%e9%92%88","status":"publish","type":"post","link":"https:\/\/blog.cookie-qwq.xyz\/index.php\/2026\/09\/18\/%e9%ab%98%e7%ba%a7%e6%8c%87%e9%92%884-%e6%b2%a1%e6%9c%89%e7%b1%bb%e5%9e%8b%ef%bc%88void%ef%bc%89%e7%9a%84%e6%8c%87%e9%92%88\/","title":{"rendered":"\u6307\u9488\u9ad8\u7ea74-\u6ca1\u6709\u7c7b\u578b\uff08void\uff09\u7684\u6307\u9488"},"content":{"rendered":"\n

\uff081\uff09\u6ca1\u6709\u7c7b\u578b\u7684\u6307\u9488\u7684\u683c\u5f0f<\/mark><\/strong><\/p>\n\n\n\n

void* \u53d8\u91cf\u540d<\/p>\n\n\n\n

\u7279\u70b9\uff1a\u65e0\u6cd5\u83b7\u53d6\u6570\u636e\uff0c\u65e0\u6cd5\u8ba1\u7b97\uff0c\u4f46\u662f\u53ef\u4ee5\u63a5\u6536\u4efb\u610f\u5730\u5740\u3002<\/mark><\/strong><\/p>\n\n\n\n

\uff082\uff09\u4e0d\u540c\u7c7b\u578b\u6307\u9488\u4e4b\u95f4\u4e0d\u80fd\u4e92\u76f8\u8d4b\u503c<\/mark><\/strong><\/p>\n\n\n\n

int* p1 = &a<\/p>\n\n\n\n

char* p3 = p1;<\/p>\n\n\n\n

\u6b64\u65f6\u7528char* p3 = p1; \u8fd0\u884c\u7a0b\u5e8f\u4f1a\u63d0\u9192\uff1a\u521d\u59cb\u5316\u4eceint* \u5230char* \u7684\u7c7b\u578b\u4e0d\u517c\u5bb9<\/mark>\uff1b<\/p>\n\n\n\n

\u4f46\u662f\u53c8\u80fd\u6b63\u5e38\u8fd0\u884c\uff0c\u662f\u56e0\u4e3a\u7cfb\u7edf\u81ea\u52a8\u5e2e\u6211\u4eec\u8fdb\u884c\u4e86\u5f3a\u8f6c\uff1a<\/p>\n\n\n\n

char* p3 = (char*)p1;<\/mark><\/strong><\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u6240\u4ee5\u6309\u7167\u903b\u8f91\u6765\u8bf4\uff0c\u4e0d\u540c\u7c7b\u578b\u7684\u6307\u9488\u4e4b\u95f4\uff0c\u662f\u4e0d\u80fd\u4e92\u76f8\u8d4b\u503c\u7684\uff0c\u8d4b\u503c\u7684\u65f6\u5019\u9700\u8981\u5f3a\u8f6c\u3002<\/mark><\/strong><\/p>\n\n\n\n

void\u7c7b\u578b\u6307\u9488\u56e0\u4e3a\u6ca1\u6709\u4efb\u4f55\u7c7b\u578b\uff0c\u6240\u4ee5\u53ef\u4ee5\u63a5\u53d7\u4efb\u610f\u7c7b\u578b\u6307\u9488\u8bb0\u5f55\u7684\u5185\u5b58\u5730\u5740<\/mark><\/strong><\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

______________________________________________________________________________________\u6211\u662f\u5206\u5272\u7ebf<\/mark><\/strong><\/p>\n\n\n\n

\uff083\uff09\u5229\u7528void\u7c7b\u578b\u6307\u9488\u6765\u4ea4\u6362\u4e24\u4e2a\u53d8\u91cf\u8bb0\u5f55\u7684\u503c<\/mark><\/strong><\/p>\n\n\n\n

\u5b9a\u4e49\u4e00\u4e2a\u65e0\u8fd4\u56de\u503c\u7c7b\u578b<\/mark>\u7684\u51fd\u6570swap()<\/mark><\/strong>\uff0c\u5f62\u53c2\u5206\u522b\u4e3avoid* p1,void* p2,int len\u3002<\/p>\n\n\n\n

\u8fd9\u91cc\u7684int len\u4ee3\u8868\u7684\u662f\u6570\u636e\u7c7b\u578b\u5b57\u8282\u5927\u5c0f<\/mark><\/strong>\uff0c\u4f8b\u5982int\u7c7b\u578b\uff0c\u8fd9\u91cc\u7684len\u5c31\u8981\u4f20\u90124\uff1b<\/p>\n\n\n\n

\u51fd\u6570\u4f53\u5982\u56fe\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u2460\u3001\u628avoid\u7c7b\u578b\u8f6c\u6362\u4e3achar\u7c7b\u578b\u7684\u6307\u9488<\/mark><\/strong><\/p>\n\n\n\n

char* pc1 =p1;<\/p>\n\n\n\n

char* pc2 =p2;<\/p>\n\n\n\n

\u8fd9\u4e00\u6b65\u7684\u4e3b\u8981\u76ee\u7684\u662f\u4e3a\u4e86\u65b9\u4fbf\u63a5\u4e0b\u6765\u7684int\u7c7b\u578b\u7684\u6570\u636e\u8f6c\u6362\u3002<\/p>\n\n\n\n

\u5728\u4e4b\u524d\u7684\u5b66\u4e60\u4e2d\uff0cint\u7c7b\u578b<\/mark><\/strong>\u5185\u5b58\u5730\u5740\u5728\u5185\u5b58\u6c60\u4e2d\u53604\u4e2a\u5b57\u8282\uff0c\u6bcf\u4e00\u4e2a\u5b57\u8282\u90fd\u662f\u5355\u72ec\u7684\u4e00\u4e2a\u5757\uff0c\u7b2c\u4e00\u4e2a\u5757\u88ab\u79f0\u4e3a\u9996\u5730\u5740<\/mark><\/strong>\uff0c\u9996\u5730\u5740<\/mark><\/strong>\u4ee3\u8868\u6574\u4e2aint\u7c7b\u578b<\/mark><\/strong>\u7684\u5730\u5740\u503c\uff0c\u8fd94\u4e2a\u5b57\u8282\u4e00\u5171\u5206\u4e3a32\u4e2abit\u4f4d\uff0c\u5982\u679c\u60f3\u8981\u628a\u4e00\u6574\u4e2aint\u7c7b\u578b<\/mark><\/strong>\u7684\u6570\u636e\u8fdb\u884c\u4e92\u6362\uff0c\u4e5f\u5c31\u662f\u8981\u6309\u7167\u987a\u5e8f\u628a\u8fd94\u4e2a\u5b57\u8282\u91cc\u9762\u768432\u4e2abit\u5168\u90e8\u4e92\u6362\u3002<\/p>\n\n\n\n

<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u6240\u4ee5\u8fd9\u91cc\u5b9a\u4e49char\u7c7b\u578b\u7684\u6307\u9488\u53d8\u91cf\uff0c\u662f\u4e3a\u4e86\u8fdb\u884c1\u4e2a\u5b57\u82821\u4e2a\u5b57\u8282\u7684\u4e92\u6362<\/mark><\/strong>\u3002<\/p>\n\n\n\n

\u2461\u3001\u5b9a\u4e49\u5faa\u73af\uff0c\u8fdb\u884c\u5b57\u8282\u7684\u66ff\u6362\u3002<\/p>\n\n\n\n

\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff0c\u4e00\u4e2a\u5b57\u8282\u4e00\u4e2a\u5b57\u8282\u7684\u66ff\u6362<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u5148\u8981\u5b9a\u4e49\u4e00\u4e2achar\u7c7b\u578b<\/mark><\/strong>\u7684\u53d8\u91cftemp\u5b58\u50a8\u6307\u9488pc1\u66ff\u6362\u4e4b\u524d\u7684\u6570\u636e\u3002<\/p>\n\n\n\n

\u8fd9\u91cc\u7684 i \u5355\u7eaf\u53ea\u662f\u5faa\u73af\u7684\u6267\u884c\u6b21\u6570<\/p>\n\n\n\n

\u7531\u4e8e\u66ff\u6362\u7684\u662fint\u7c7b\u578b\uff0c\u6240\u4ee5i < len\uff084\uff09\uff0c\u5faa\u73af\u6bcf\u5b8c\u6210\u4e00\u6b21\uff0ci\u5c31+1<\/p>\n\n\n\n

\u7b2c\u4e00\u6b21\u5faa\u73af\u4ece0\u5f00\u59cb\uff0c\u4ee3\u8868\u6211\u4ece\u7b2c\u4e00\u4e2a\u5b57\u8282\u5f00\u59cb\u4e92\u6362\uff0c\u5faa\u73af\u6bcf\u5b8c\u6210\u4e00\u6b21\uff0cchar\u7c7b\u578b\u6307\u9488pc1\u548cpc2\u5c31\u5411\u53f3\u79fb\u52a81\u4e2a\u5b57\u8282\uff0c\u7136\u540e\u5f00\u59cb\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u4e92\u6362\u3002<\/p>\n\n\n\n

\u4ee5\u6b64\u7c7b\u63a8\u3002<\/p>\n\n\n\n

\u8fd9\u91cc\u8fd8\u6d89\u53ca\u5230\u4e86\u6307\u5b9a\u79fb\u52a8\u7684\u6b65\u957f\uff0c\u7531\u4e8e\u662fchar\u7c7b\u578b\uff0c\u6240\u4ee5char\u7c7b\u578b\u6307\u9488\u53d8\u91cf\u6bcf+1\uff0c\u79fb\u52a8\u7684\u6b65\u957f\u4e3a1\u5b57\u8282\u3002<\/p>\n\n\n\n

\u4f7f\u7528void\u7c7b\u578b\u6307\u9488\u7528\u6765\u66ff\u6362\u540c\u7c7b\u578b\u7684\u6570\u636e\uff0c\u597d\u5904\u5c31\u662f\u8fd9\u4e2a\u51fd\u6570\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u9700\u6c42\u505a\u4e0d\u540c\u7c7b\u578b\u7684\u8f6c\u6362\u3002<\/p>\n\n\n\n

\u2462\u3001\u8c03\u7528\u51fd\u6570\u5e76\u6253\u5370\u8f93\u51fa<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\uff084\uff09void\u7c7b\u578b\u6307\u9488\u7684\u7f3a\u70b9<\/mark><\/strong><\/p>\n\n\n\n

\u65e0\u6cd5\u83b7\u53d6\u53d8\u91cf\u91cc\u9762\u7684\u6570\u636e\uff0c\u4e5f\u4e0d\u80fd\u8fdb\u884c\u52a0\u3001\u51cf\u7684\u64cd\u4f5c\uff08\u56e0\u4e3a\u52a0\u3001\u51cf\u64cd\u4f5c\u9700\u8981\u660e\u786e\u6307\u9488\u7684\u7c7b\u578b\uff09\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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