![](\"https:\/\/pic.vanforever.com.cn\/Vanforever\/20240421\/wallhaven-zyrv6g_3840x2400.png\")
<\/div><\/div><\/div>\n<\/p>\n
C++\u662f\u5982\u4f55\u505a\u5185\u5b58\u7ba1\u7406\u7684?<\/h1>\n\u4e86\u89e3\u5185\u5b58\u533a\u57df<\/h2>\n\u521d\u6b65\u4e86\u89e3<\/h3>\n
\u521d\u6b65\u4e86\u89e3<\/h3>\n
\u5728C++\u4e2d\uff0c\u5185\u5b58\u5206\u4e3a\uff1a\u6808\u3001\u5806\u3001\u81ea\u7531\u5b58\u50a8\u533a\u3001\u5168\u5c40\/\u9759\u6001\u5b58\u50a8\u533a\u3001\u5e38\u91cf\u5b58\u50a8\u533a\u3002<\/p>\n
\u5806<\/strong>\uff0c\u5c31\u662f\u90a3\u4e9b\u7531malloc\u5206\u914d\u7684\u5185\u5b58\u5757\uff0c\u7528free\u6765\u91ca\u653e\u5185\u5b58\u3002\u5806\u5c5e\u4e8e\u52a8\u6001\u5185\u5b58\u5206\u914d\uff0c\u5b83\u53ef\u4ee5\u5206\u914d\u8f83\u5927\u5757\u7684\u5185\u5b58\uff0c\u4f46\u662f\u901f\u5ea6\u4f1a\u6bd4\u8f83\u6162\u3002<\/p>\n \u6808<\/strong>\uff0c\u5c40\u90e8\u53d8\u91cf\uff0c\u51fd\u6570\u53c2\u6570\uff0c\u8fd4\u56de\u5730\u5740\u90fd\u5728\u6808\u4e0a\u5206\u914d\uff0c\u800c\u4e14\u6808\u7684\u5206\u914d\u548c\u91ca\u653e\u975e\u5e38\u5feb\uff0c\u4f46\u662f\u5927\u5c0f\u6709\u9650\u3002<\/p>\n \u81ea\u7531\u5b58\u50a8\u533a<\/strong>\uff0c\u90a3\u4e9b\u4f7f\u7528 \u5168\u5c40\/\u9759\u6001\u5b58\u50a8\u533a<\/strong>\uff0c\u7a0b\u5e8f\u751f\u547d\u5468\u671f\u5185\u4e00\u76f4\u5b58\u5728\u7684\u5185\u5b58\u533a\u57df\u3002\u7528\u4e8e\u5b58\u50a8\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\uff0c\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\u88ab\u5206\u914d\u5230\u540c\u4e00\u5757\u5185\u5b58\u4e2d\uff0c\u5728\u7a0b\u5e8f\u542f\u52a8\u65f6\u5206\u914d\uff0c\u5728\u7a0b\u5e8f\u7ed3\u675f\u65f6\u91ca\u653e\u3002<\/p>\n \u5e38\u91cf\u5b58\u50a8\u533a<\/strong>\uff0c\u7528\u4e8e\u5b58\u50a8\u7a0b\u5e8f\u4e2d\u7684\u5e38\u91cf\uff0c\u5982 <\/p>\n \u4ece\u6280\u672f\u4e0a\u6765\u8bf4\uff0c\u5806\uff08heap\uff09\u662fC\u8bed\u8a00\u548c\u64cd\u4f5c\u7cfb\u7edf\u7684\u672f\u8bed\u3002\u5806\u662f\u64cd\u4f5c\u7cfb\u7edf\u6240\u7ef4\u62a4\u7684\u4e00\u5757\u7279\u6b8a\u5185\u5b58\uff0c\u5b83\u63d0\u4f9b\u4e86\u52a8\u6001\u5206\u914d\u7684\u529f\u80fd\uff0c\u5f53\u8fd0\u884c\u7a0b\u5e8f\u8c03\u7528malloc()\u65f6\u5c31\u4f1a\u4ece\u4e2d\u5206\u914d\uff0c\u7a0d\u540e\u8c03\u7528free\u53ef\u628a\u5185\u5b58\u4ea4\u8fd8\u3002\u800c\u81ea\u7531\u5b58\u50a8\u533a\u662fC++\u4e2d\u901a\u8fc7new\u548cdelete\u52a8\u6001\u5206\u914d\u548c\u91ca\u653e\u5bf9\u8c61\u7684\u62bd\u8c61\u6982\u5ff5<\/strong>\uff0c\u901a\u8fc7new\u6765\u7533\u8bf7\u7684\u5185\u5b58\u533a\u57df\u53ef\u79f0\u4e3a\u81ea\u7531\u5b58\u50a8\u533a\u3002<\/p>\n \u95ee:<\/strong> \u501f\u4ee5malloc\u5b9e\u73b0\u7684new\uff0c\u6240\u7533\u8bf7\u7684\u5185\u5b58\u662f\u5728\u5806\u4e0a\u8fd8\u662f\u5728\u81ea\u7531\u5b58\u50a8\u533a\u4e0a\uff1f<\/p>\n \u7b54:<\/strong> \u5f53\u4f60\u4f7f\u7528 C++ \u7684 \u4f46\u7a0b\u5e8f\u5458\u4e5f\u53ef\u4ee5\u901a\u8fc7\u91cd\u8f7d\u64cd\u4f5c\u7b26\uff0c\u6539\u7528\u5176\u4ed6\u5185\u5b58\u6765\u5b9e\u73b0\u81ea\u7531\u5b58\u50a8\uff0c\u4f8b\u5982\u5168\u5c40\u53d8\u91cf\u505a\u7684\u5bf9\u8c61\u6c60\uff0c\u8fd9\u65f6\u81ea\u7531\u5b58\u50a8\u533a\u5c31\u533a\u522b\u4e8e\u5806\u4e86\u3002<\/p>\n <\/p>\n \u8fd9\u6761\u77ed\u77ed\u7684\u4e00\u53e5\u8bdd\u5c31\u5305\u542b\u4e86\u5806\u4e0e\u6808\uff0c\u770b\u5230new\uff0c\u6211\u4eec\u9996\u5148\u5c31\u5e94\u8be5\u60f3\u5230\uff0c\u6211\u4eec\u5206\u914d\u4e86\u4e00\u5757\u5806\u5185\u5b58\uff0c\u90a3\u4e48\u6307\u9488p\u5462\uff1f\u4ed6\u5206\u914d\u7684\u662f\u4e00\u5757\u6808\u5185\u5b58\uff0c\u6240\u4ee5\u8fd9\u53e5\u8bdd\u7684\u610f\u601d\u5c31\u662f\uff1a\u5728\u6808\u5185\u5b58\u4e2d\u5b58\u653e\u4e86\u4e00\u4e2a\u6307\u5411\u4e00\u5757\u5806\u5185\u5b58\u7684\u6307\u9488p\u3002\u5728\u7a0b\u5e8f\u4f1a\u5148\u786e\u5b9a\u5728\u5806\u4e2d\u5206\u914d\u5185\u5b58\u7684\u5927\u5c0f\uff0c\u7136\u540e\u8c03\u7528operator new\u5206\u914d\u5185\u5b58\uff0c\u7136\u540e\u8fd4\u56de\u8fd9\u5757\u5185\u5b58\u7684\u9996\u5730\u5740\uff0c\u653e\u5165\u6808\u4e2d<\/strong>\u3002<\/p>\n \u4e0b\u9762\u662f\u5728Visual C++ 2022\u4e0b\u7684\u6c47\u7f16\u4ee3\u7801<\/p>\n <\/p>\n \u90a3\u4e48\u56de\u5230\u6b63\u9898,\u5806\u4e0e\u6808\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/p>\n \u7ba1\u7406\u65b9\u5f0f<\/strong>\uff1a<\/p>\n \u7a7a\u95f4\u5927\u5c0f\uff1a<\/strong><\/p>\n \t\u4e00\u822c\u6765\u8bb2\u572832\u4f4d\u7cfb\u7edf\u4e0b\uff0c\u5806\u5185\u5b58\u53ef\u4ee5\u8fbe\u52304G\u7684\u7a7a\u95f4\uff0c\u4ece\u8fd9\u4e2a\u89d2\u5ea6\u6765\u770b\u5806\u5185\u5b58\u51e0\u4e4e\u662f\u6ca1\u6709\u4ec0\u4e48\u9650\u5236\u7684\uff0c\u7406\u8bba\u4e0a\u5185\u5b58\u6709\u591a\u5927,\u5c31\u53ef\u4ee5\u5efa\u591a\u5927.\u3002\u4f46\u662f\u5bf9\u4e8e\u6808\u6765\u8bb2\uff0c\u4e00\u822c\u90fd\u662f\u6709\u4e00\u5b9a\u7684\u7a7a\u95f4\u5927\u5c0f\u7684\uff0c\u4f8b\u5982\uff0c\u5728Visual C++ 2022\u4e0b\u9762\uff0c\u9ed8\u8ba4\u7684\u6808\u7a7a\u95f4\u5927\u5c0f\u662f1M\u3002ubuntu\u4e2d\u9ed8\u8ba48M\u3002<\/p>\n \u788e\u7247\u95ee\u9898\uff1a<\/strong><\/p>\n \u5728\u5806\u4e2d\u9891\u7e41\u7684 \u6548\u7387\u95ee\u9898\uff1a<\/strong><\/p>\n \u5206\u914d\u65b9\u5f0f\uff1a<\/strong><\/p>\n \t\u5806\u90fd\u662f\u52a8\u6001\u5206\u914d\u7684\uff0c\u6ca1\u6709\u9759\u6001\u5206\u914d\u7684\u5806\u3002\u6808\u67092\u79cd\u5206\u914d\u65b9\u5f0f\uff1a\u9759\u6001\u5206\u914d\u548c\u52a8\u6001\u5206\u914d\u3002\u9759\u6001\u5206\u914d\u662f\u7f16\u8bd1\u5668\u5b8c\u6210\u7684\uff0c\u6bd4\u5982\u5c40\u90e8\u53d8\u91cf\u7684\u5206\u914d\u3002\u52a8\u6001\u5206\u914d\u7531 \u95ee\uff1aC++\u548cC\u5206\u522b\u4f7f\u7528\u4ec0\u4e48\u51fd\u6570\u6765\u505a\u5185\u5b58\u7684\u5206\u914d\u548c\u91ca\u653e\uff1f\u6709\u4ec0\u4e48\u533a\u522b\uff0c\u80fd\u5426\u6df7\u7528\uff1f<\/strong><\/p>\n \u5728C++\u4e2d\uff0c\u5185\u5b58\u7684\u5206\u914d\u548c\u91ca\u653e\u901a\u5e38\u4f7f\u7528 \u5728C++\u4e2d<\/p>\n \u5728C\u8bed\u8a00\u4e2d<\/p>\n \u533a\u522b:<\/p>\n <\/p>\n \u7ed3\u8bba\uff1a\u4e0d\u8981\u6df7\u7528\uff01\uff01\uff01<\/strong>\u5728C++\u4e2d\u6df7\u7528C\u7684\u5185\u5b58\u7ba1\u7406\u51fd\u6570\u4f1a\u5bfc\u81f4\u7c7b\u578b\u5b89\u5168\u6027\u7684\u4e27\u5931\uff0c\u56e0\u4e3aC\u7684\u51fd\u6570\u65e0\u6cd5\u4fdd\u8bc1\u5206\u914d\u7684\u5185\u5b58\u88ab\u6b63\u786e\u5730\u7528\u4e8e\u6307\u5b9a\u7684\u7c7b\u578b\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4\u7c7b\u578b\u9519\u8bef\uff0c\u6bd4\u5982\u5c1d\u8bd5\u7528 <\/p>\n <\/p>\n \u95ee\uff1a\u4e3a\u4ec0\u4e48\u9700\u8981new\u4e0edelete?<\/strong><\/p>\n \u5bf9\u4e8e\u975e\u5185\u90e8\u6570\u636e\u7c7b\u578b\u7684\u5bf9\u8c61<\/strong>\u800c\u8a00\uff0c\u5149\u7528malloc\/free\u65e0\u6cd5\u6ee1\u8db3\u52a8\u6001\u5bf9\u8c61\u7684\u8981\u6c42\u3002\u5bf9\u8c61\u5728\u521b\u5efa\u7684\u540c\u65f6\u8981\u81ea\u52a8\u6267\u884c\u6784\u9020\u51fd\u6570\uff0c\u5bf9\u8c61\u5728\u6d88\u4ea1\u4e4b\u524d\u8981\u81ea\u52a8\u6267\u884c\u6790\u6784\u51fd\u6570\u3002\u7531\u4e8emalloc\/free\u662f\u5e93\u51fd\u6570\u800c\u4e0d\u662f\u8fd0\u7b97\u7b26\uff0c\u4e0d\u5728\u7f16\u8bd1\u5668\u63a7\u5236\u6743\u9650\u4e4b\u5185\uff0c\u4e0d\u80fd\u591f\u628a\u6267\u884c\u6784\u9020\u51fd\u6570\u548c\u6790\u6784\u51fd\u6570\u7684\u4efb\u52a1\u5f3a\u52a0\u4e8emalloc\/free\u3002\u56e0\u6b64C++\u8bed\u8a00\u9700\u8981\u4e00\u4e2a\u80fd\u5b8c\u6210\u52a8\u6001\u5185\u5b58\u5206\u914d\u548c\u521d\u59cb\u5316\u5de5\u4f5c\u7684\u8fd0\u7b97\u7b26new\uff0c\u4ee5\u53ca\u4e00\u4e2a\u80fd\u5b8c\u6210\u6e05\u7406\u4e0e\u91ca\u653e\u5185\u5b58\u5de5\u4f5c\u7684\u8fd0\u7b97\u7b26delete\u3002<\/p>\n <\/p>\n new<\/strong><\/p>\n \u5206\u914d\u548c\u6784\u9020\u5355\u4e2a\u5bf9\u8c61<\/strong><\/p>\n \u5206\u914d\u548c\u6784\u9020\u5bf9\u8c61\u6570\u7ec4<\/strong><\/p>\n \u4f7f\u7528\u5b9a\u4f4dnew<\/strong><\/p>\n \u4f7f\u7528\u521d\u59cb\u5316\u5668\u5217\u8868\uff08C++11\u53ca\u4ee5\u540e\uff09<\/strong><\/p>\n \u7c7b\u578b\u63a8\u5bfc\uff08C++11\u53ca\u4ee5\u540e\uff09<\/strong><\/p>\n delete<\/strong><\/p>\n \u91ca\u653e\u5355\u4e2a\u5bf9\u8c61<\/strong><\/p>\n \u91ca\u653e\u5bf9\u8c61\u6570\u7ec4<\/strong><\/p>\n <\/p>\n \u6ce8\u610f:<\/strong>\u540c\u4e00\u5757\u5185\u5b58\u91ca\u653e\u4e24\u6b21\uff0c\u5982\u679c\u5bf9\u5176\u4e2d\u4e00\u4e2a\u6307\u9488\u8fdb\u884c\u4e86delete\u64cd\u4f5c\uff0c\u5bf9\u8c61\u7684\u5185\u5b58\u88ab\u5f52\u8fd8\u7ed9\u81ea\u7531\u7a7a\u95f4\uff0c\u5982\u679c\u6211\u4eec\u968f\u540e\u53c8delete\u7b2c\u4e8c\u4e2a\u6307\u9488\uff0c\u5185\u5b58\u7a7a\u95f4\u5c31\u53ef\u80fd\u88ab\u7834\u574f\u3002<\/p>\n <\/p>\n \u91cd\u8f7dnew\u548cdelete<\/strong><\/p>\n <\/p>\n \u5bf9\u5355\u4e2a\u7c7b\u4e2d\u7684new\u548cdelete\u91cd\u8f7d<\/strong><\/p>\n <\/p>\n \u5728\u8fd9\u91cc\u6211\u4eec\u5206\u4e3a\u4e09\u6b65<\/p>\n <\/p>\n \u5206\u914d\u5185\u5b58\u8fd9\u4e00\u6b65\u5c31\u662f\u7531 \u5426\u5219\u5c06\u8c03\u7528\u5168\u5c40 (1)(2)\u7684\u533a\u522b\u4ec5\u662f\u662f\u5426\u629b\u51fa\u5f02\u5e38\uff0c\u5f53\u5206\u914d\u5931\u8d25\u65f6\uff0c\u524d\u8005\u4f1a\u629b\u51fa (3)\u662fplacement new\uff0c\u5b83\u4e5f\u662f\u5bf9operator new\u7684\u4e00\u4e2a\u91cd\u8f7d\uff0c\u5b9a\u4e49\u4e8e placement new\u672c\u8eab\u53ea\u662f\u8fd4\u56de\u6307\u9488p\uff0cnew(p) A()\u8c03\u7528placement new\u4e4b\u540e\uff0c\u8fd8\u4f1a\u5728p\u4e0a\u8c03\u7528A:A()<\/p>\n \u4f7f\u7528 \u7406\u7531\uff1aplacement new\u53ea\u662f\u5728\u73b0\u6709\u7684\u5185\u5b58\u4f4d\u7f6e\u4e0a\u6784\u9020\u5bf9\u8c61\uff0c\u5b83\u4e0d\u8d1f\u8d23\u5185\u5b58\u7684\u5206\u914d<\/strong>\u3002\u56e0\u6b64\uff0c\u5f53\u4f60\u4f7f\u7528placement new\u65f6\uff0c\u4f60\u5fc5\u987b\u5df2\u7ecf\u4e3a\u5bf9\u8c61\u5206\u914d\u597d\u4e86\u5185\u5b58\u7a7a\u95f4\u3002\u7531\u4e8edelete\u64cd\u4f5c\u4f1a\u5c1d\u8bd5\u91ca\u653e\u7531new\u64cd\u4f5c\u5206\u914d\u7684\u5185\u5b58\uff0c\u4f7f\u7528\u5b83\u6765\u91ca\u653e\u901a\u8fc7placement new\u6784\u9020\u7684\u5bf9\u8c61\u4f1a\u5bfc\u81f4\u672a\u5b9a\u4e49\u884c\u4e3a\uff0c\u56e0\u4e3adelete\u4f1a\u5c1d\u8bd5\u53bb\u91ca\u653e\u4e00\u5757\u5b83\u6ca1\u6709\u8bb0\u5f55\u5206\u914d\u4fe1\u606f\u7684\u5185\u5b58\u3002<\/p>\n <\/p>\n \u6ce8\u610f\u53ea\u662f\u4fbf\u4e8e\u7406\u89e3<\/strong>,\u4e0d\u63a8\u8350\u6df7\u7528<\/strong><\/p>\n \u5f53\u6307\u9488\u4e0d\u662f\u7c7b\u5bf9\u8c61\u65f6\uff0c\u7406\u8bba\u4e0a\u4f60\u53ef\u4ee5\u4f7f\u7528 <\/p>\n new[]\u5728\u5206\u914d\u65f6\uff0c\u5982\u679c\u7c7b\u4e2d\u663e\u5f0f\u5b9a\u4e49\u4e86\u6790\u6784\u51fd\u6570\uff0cnew\u4f1a\u5728\u5206\u914d\u7684\u65f6\u5019\uff0c\u6839\u636e\u7cfb\u7edf\u7684\u4f4d\u6570\u989d\u5916\u5206\u914d\u5bf9\u5e94\u7684\u7a7a\u95f4\uff0832\u4f4d\u7cfb\u7edf\u5206\u914d32\u4f4d\u7a7a\u95f4\uff0c\u4e5f\u5c31\u662f4\u5b57\u8282\uff0c64\u4f4d\u7cfb\u7edf\u5206\u914d64\u4f4d\u7a7a\u95f4\uff0c\u4e5f\u5c31\u662f8\u5b57\u8282\uff09\u3002\u5982\u5bf9\u4e8e32\u4f4d\u7cfb\u7edf\uff0cnew[2]\u5206\u914d\u7684\u7a7a\u95f4\u5e94\u8be5\u5982\u4e0b\uff1a<\/p>\n <\/p>\n \u6240\u4ee5\u57fa\u7840\u6570\u636e\u7c7b\u578b\uff0c\u662f\u53ef\u4ee5\u76f4\u63a5\u6df7\u7528\u7684\uff0c\u4f46\u7c7b\u7c7b\u578b\u662f\u4e0d\u53ef\u4ee5\u7684\u3002<\/p>\n new\u5f00\u8f9f\u5bf9\u8c61\u6570\u7ec4\u65f6\uff0c\u4f1a\u5728\u6570\u7ec4\u7684\u6700\u4e0a\u65b9\u591a\u4e00\u4e2a\u56db\u5b57\u8282\u7684\u6570\uff0c\u7528\u6765\u8bb0\u5f55\u5bf9\u8c61\u7684\u4e2a\u6570\uff0c\u65b9\u4fbf\u8c03\u7528\u6790\u6784\u51fd\u6570\u3002\u7528delete\u3010\u3011\u91ca\u653e\u5185\u5b58\u65f6\uff0c\u4f1a\u5728\u539f\u6709new\u51fa\u6765\u7684\u5185\u5b58\u4e0a – 4\uff0c\u4ece\u800c\u6b63\u786e\u91ca\u653e\u5185\u5b58\uff0c\u800cdelete\u5374\u4f1a\u76f4\u63a5\u5d29\u6e83\u3002\u4e5f\u5c31\u76f8\u5f53\u4e8e<\/p>\n <\/p>\n _CrtMemBlockHeader<\/strong> \uff1a\u8fd9\u4e2a\u7ed3\u6784\u4f53\uff0c\u5b58\u653e\u4e86\u52a8\u6001\u7533\u8bf7\u5f97\u5230\u7684\u5185\u5b58\u5757\u7684\u5404\u79cd\u4fe1\u606f\uff0c\u5e76\u4e14\u8fd4\u56de\u5230\u4f60\u7684\u6307\u9488\u4e0a\u9762\u3002<\/p>\n <\/p>\n \u6211\u4eec\u6765\u8bf4\u4e00\u8bf4 \u5728\u8fd9\u91cc\u521b\u5efa\u4e00\u4e2a\u6307\u5411int\u7684p\u6307\u9488,\u53ef\u4ee5\u770b\u5230 \u4e0a\u9762\u6211\u4eec\u77e5\u9053\u4e86 <\/p>\n \u667a\u80fd\u6307\u9488\u662fRAII\u601d\u60f3\u7684\u4f53\u73b0\uff0cRAII\u601d\u60f3\u7684\u6838\u5fc3\u5728\u4e8e\u5c06\u8d44\u6e90\u7684\u83b7\u53d6\u548c\u521d\u59cb\u5316\u5c01\u88c5\u5728\u4e00\u4e2a\u5bf9\u8c61\u7684\u6784\u9020\u51fd\u6570\u4e2d\uff0c\u5c06\u8d44\u6e90\u7684\u91ca\u653e\u548c\u5bf9\u8c61\u7684\u6790\u6784\u51fd\u6570\u7ed3\u5408\u8d77\u6765\u3002\u8fd9\u6837\uff0c\u5f53\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u7ed3\u675f\u65f6\uff0c\u5176\u6790\u6784\u51fd\u6570\u4f1a\u81ea\u52a8\u88ab\u8c03\u7528\uff0c\u4ece\u800c\u91ca\u653e\u8d44\u6e90\uff0c\u907f\u514d\u4e86\u8d44\u6e90\u6cc4\u6f0f\u7684\u95ee\u9898\u3002<\/p>\n <\/p>\n \u6ce8\u610f:<\/strong>\u4e0d\u8981\u4f7f\u7528get\u521d\u59cb\u5316\u53e6\u4e00\u4e2a\u667a\u80fd\u6307\u9488\u6216\u4e3a\u667a\u80fd\u6307\u9488\u8d4b\u503c\u3002\u8981\u5c0f\u5fc3\u4f7f\u7528\uff0c\u82e5\u667a\u80fd\u6307\u9488\u91ca\u653e\u4e86\u5176\u5bf9\u8c61\uff0c\u8fd4\u56de\u7684\u6307\u9488\u6240\u6307\u5411\u7684\u5bf9\u8c61\u4e5f\u5c31\u6d88\u5931\u4e86\u3002\u4e5f\u4e0d\u8981delete get()\u8fd4\u56de\u7684\u6307\u9488\u3002<\/p>\n <\/p>\n Auto_ptr:<\/strong><\/p>\n \u8fd9\u662f\u6700\u65e9\u7684\u667a\u80fd\u6307\u9488\uff0c\u91cc\u9762\u6709\u4e00\u4e9b\u53cd\u76f4\u89c9\u7684\u64cd\u4f5c\uff0c<\/p>\n <\/p>\n \u4e0d\u652f\u6301\u590d\u5236\u8bed\u4e49\uff0c\u5220\u9664\u4e86\u5de6\u503c\u62f7\u8d1d\u6784\u9020\u51fd\u6570\uff0c\u548c\u5de6\u503c\u7684\u8d4b\u503c\u64cd\u4f5c\uff0c\u5373\u4e0d\u80fd\u5c06 \u5f53 \u53ef\u4ee5\u4f7f\u7528reset()\u91ca\u653e\u6307\u9488\u5f53\u524d\u62e5\u6709\u7684\u5bf9\u8c61\u3002<\/p>\n <\/p>\n<\/li>\n<\/ul>\n <\/p>\nnew<\/code>\u5206\u914d\u7684\u5b58\u50a8\u5757<\/p>\nconst<\/code>\u53d8\u91cf\u548c\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\uff08\u7528\u53cc\u5f15\u53f7\u62ec\u8d77\u6765\u7684\u5b57\u7b26\u5e8f\u5217<\/strong>\u5c31\u662f\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u3002 \u4f8b\u5982\uff1a"abc""abcdn"<\/code>\uff09<\/p>\n\u5806\u4e0e\u81ea\u7531\u5b58\u50a8\u533a<\/h3>\n
\n
new<\/code> \u64cd\u4f5c\u7b26\u65f6\uff0c\u4f60\u662f\u5728\u81ea\u7531\u5b58\u50a8\u533a\u4e0a\u8bf7\u6c42\u5185\u5b58\uff0c\u5373\u4f7f\u5728\u5e95\u5c42\u5b9e\u73b0\u4e2d\u5b83\u53ef\u80fd\u4f7f\u7528\u4e86 malloc<\/code> \u6765\u4ece\u5806\u4e0a\u83b7\u53d6\u90a3\u5757\u5185\u5b58\u3002<\/p>\n<\/blockquote>\n#include <iostream>\n\nclass Myclass {\npublic:\n\tstatic void* operator new (size_t size) {\n\n\t\tstatic char pool[sizeof(Myclass) * 100];\n\t\tstatic int index = 0;\n\n\t\tif (index < 100)\n\t\t{\n\t\t\tvoid* ptr = pool + (index * sizeof(Myclass));\n\t\t\treturn ptr;\n\t\t}\n\t\telse\n\t\t{\n\t\t\tthrow std::bad_alloc();\n\t\t}\n\n\t}\n\n\tstatic void operator delete(void* ptr) noexcept{\n\n\t}\n\n};\n\nint main()\n{\n\ttry\n\t{\n\t\tMyclass* obj = new Myclass();\n\t\tdelete obj;\n\t}\n\tcatch (const std::bad_alloc& e)\n\t{\n\t\tstd::cerr << "Memory allocation failed: " << e.what() << std::endl;\n\t}\n\n\treturn 0;\n}\n<\/code><\/pre>\n\u5806\u548c\u6808<\/h3>\n
void f() { int* p=new int[5]; }\n<\/code><\/pre>\n00007FF7431B18CB mov ecx,14h \n00007FF7431B18D0 call operator new[] (07FF7431B11A4h) \n00007FF7431B18D5 mov qword ptr [rbp+0E8h],rax \n00007FF7431B18DC mov rax,qword ptr [rbp+0E8h] \n00007FF7431B18E3 mov qword ptr [p],rax \n<\/code><\/pre>\n\n
malloc\/free<\/code>\u52bf\u5fc5\u4f1a\u9020\u6210\u5185\u5b58\u7a7a\u95f4\u7684\u4e0d\u8fde\u7eed\u4f1a\u4ea7\u751f\u5185\u5b58\u788e\u7247\uff0c\u6808\u4e0d\u4f1a\u4ea7\u751f\u5185\u5b58\u788e\u7247\uff1b<\/p>\n\n
alloca()<\/code>\u51fd\u6570\u8fdb\u884c\u5206\u914d\uff0c\u4f46\u662f\u6808\u7684\u52a8\u6001\u5206\u914d\u548c\u5806\u662f\u4e0d\u540c\u7684\uff0c\u4ed6\u7684\u52a8\u6001\u5206\u914d\u662f\u7531\u7f16\u8bd1\u5668\u8fdb\u884c\u91ca\u653e\uff0c\u65e0\u9700\u6211\u4eec\u624b\u5de5\u5b9e\u73b0\u3002<\/p>\n<\/p>\n\u4e86\u89e3\u5185\u5b58\u7684\u5206\u914d\u4e0e\u91ca\u653e<\/h2>\n
\u521d\u6b65\u4e86\u89e3<\/h3>\n
new<\/code>\u548cdelete<\/code>\u5173\u952e\u5b57\u6765\u5b8c\u6210\u3002\u800c\u5728C\u8bed\u8a00\u4e2d\uff0c\u5219\u4f7f\u7528malloc<\/code>\u3001calloc<\/code>\u3001realloc<\/code>\u548cfree<\/code>\u51fd\u6570\u6765\u8fdb\u884c\u5185\u5b58\u7684\u5206\u914d\u548c\u91ca\u653e\u3002<\/p>\n\n
new<\/code>\u5173\u952e\u5b57\u7528\u4e8e\u52a8\u6001\u5206\u914d\u5185\u5b58\uff0c\u5e76\u8c03\u7528\u5bf9\u8c61\u7684\u6784\u9020\u51fd\u6570\u3002<\/li>\ndelete<\/code>\u5173\u952e\u5b57\u7528\u4e8e\u91ca\u653enew<\/code>\u5206\u914d\u7684\u5185\u5b58\uff0c\u5e76\u8c03\u7528\u5bf9\u8c61\u7684\u6790\u6784\u51fd\u6570\u3002<\/li>\n<\/ul>\n\n
malloc<\/code>\u7528\u4e8e\u5206\u914d\u6307\u5b9a\u5927\u5c0f\u7684\u5185\u5b58\u5757\u3002<\/li>\ncalloc<\/code>\u4e5f\u7528\u4e8e\u5206\u914d\u5185\u5b58\uff0c\u540c\u65f6\u521d\u59cb\u5316\u5206\u914d\u7684\u5185\u5b58\u4e3a0\u3002<\/li>\nrealloc<\/code>\u7528\u4e8e\u8c03\u6574\u4e4b\u524d\u5206\u914d\u7684\u5185\u5b58\u5757\u7684\u5927\u5c0f\u3002<\/li>\nfree<\/code>\u7528\u4e8e\u91ca\u653e\u4e4b\u524d\u7531malloc<\/code>\u3001calloc<\/code>\u6216realloc<\/code>\u5206\u914d\u7684\u5185\u5b58\u3002<\/li>\n<\/ul>\n\n
new<\/code>\u548cdelete<\/code>\u4f1a\u5206\u522b\u8c03\u7528\u5bf9\u8c61\u7684\u6784\u9020\u51fd\u6570\u548c\u6790\u6784\u51fd\u6570\uff0c\u800cC\u7684\u5185\u5b58\u5206\u914d\u51fd\u6570\u5219\u4e0d\u4f1a\u3002<\/li>\nnew<\/code>\u548cdelete<\/code>\u64cd\u4f5c\u7b26\u63d0\u4f9b\u7c7b\u578b\u5b89\u5168\uff0c\u5206\u914d\u548c\u91ca\u653e\u7684\u662f\u7279\u5b9a\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u800cC\u7684\u51fd\u6570\u5219\u53ea\u662f\u5904\u7406\u5185\u5b58\uff0c\u4e0d\u5173\u5fc3\u5185\u5b58\u4e2d\u5b58\u50a8\u7684\u662f\u4ec0\u4e48\u7c7b\u578b\u7684\u6570\u636e\u3002\uff08\u4e5f\u5c31\u662f\u8bf4free() \u5e76\u4e0d\u5173\u5fc3\u4ed6\u91ca\u653e\u7684\u662f\u4ec0\u4e48\u7c7b\u578b\u7684\u5185\u5bb9\uff09<\/li>\nnew<\/code>\u8fd4\u56de\u7684\u662f\u5177\u4f53\u7c7b\u578b\u7684\u6307\u9488\uff0c\u7c7b\u578b\u5b89\u5168\uff0c\u800cC\u8bed\u8a00\u7684malloc<\/code>\u7b49\u51fd\u6570\u8fd4\u56de\u7684\u662fvoid*<\/code>\uff0c\u9700\u8981\u7528\u6237\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002<\/li>\nfree<\/code>\u91ca\u653e\u4e00\u4e2a\u7531new<\/code>\u5206\u914d\u7684\u5185\u5b58\u5757\uff0c\u8fd9\u6837\u505a\u4e0d\u4f1a\u8c03\u7528\u5bf9\u8c61\u7684\u6790\u6784\u51fd\u6570\uff0c\u4ece\u800c\u5bfc\u81f4\u8d44\u6e90\u6cc4\u6f0f\u6216\u672a\u5b9a\u4e49\u884c\u4e3a\u3002\u56e0\u6b64\uff0c\u5728C++\u4e2d\uff0c\u63a8\u8350\u4f7f\u7528new<\/code>\u548cdelete<\/code>\u6765\u7ba1\u7406\u52a8\u6001\u5185\u5b58\uff0c\u4ee5\u4fdd\u6301\u7c7b\u578b\u5b89\u5168\u3002<\/p>\nnew \u4e0e delete<\/h3>\n
new\u4e0edelete\u7684\u4f7f\u7528<\/h4>\n
\n
int* p = new int(10); \/\/\/\/ \u5206\u914d\u4e00\u4e2aint\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u8c03\u7528\u5176\u6784\u9020\u51fd\u6570\uff08\u5982\u679c\u6709\uff09\u8fdb\u884c\u521d\u59cb\u5316\u4e3a10\u3002\n<\/code><\/pre>\n<\/li>\nint* pArray = new int[10]; \/\/\u5206\u914d\u4e00\u4e2a\u5305\u542b10\u4e2aint\u5bf9\u8c61\u7684\u6570\u7ec4\uff0c\u4f46\u662f\u5bf9\u8c61\u6ca1\u6709\u521d\u59cb\u5316\n\/\/C++11\u53ca\u4ee5\u540e \u53ef\u4ee5\u4f7f\u7528\u521d\u59cb\u5316\u5668\u5217\u8868\nint* pArray = new int[10] {1, 2, 3, 4, 5}; \/\/\u5206\u914d\u5e76\u521d\u59cb\u5316\u6570\u7ec4\u7684\u524d5\u4e2a\u5143\u7d20\n<\/code><\/pre>\n<\/li>\nvoid* rawMemory = malloc(sizeof(int) * 10);\nint* pArray = new(rawMemory) int[10]; \/\/\u5728\u5df2\u7ecf\u5206\u914d\u7684\u5185\u5b58\u4e0a\u6784\u9020\u6570\u7ec4\n<\/code><\/pre>\n<\/li>\nstd::vector<int>* pVector = new std::vector<int>{ 1,2,3,4,5 }; \/\/\u5206\u914d\u5e76\u521d\u59cb\u5316\u4e00\u4e2astd::vector\n<\/code><\/pre>\n<\/li>\nauto p = new auto('a'); \/\/ \u5206\u914d\u4e00\u4e2achar\u7c7b\u578b\u7684\u5bf9\u8c61\u5e76\u521d\u59cb\u5316\u4e3a'a'\n<\/code><\/pre>\n<\/li>\n<\/ol>\n\n
delete p;\n<\/code><\/pre>\n<\/li>\ndelete[] pArray;\n<\/code><\/pre>\n<\/li>\n<\/ol>\nnew\u4e0edelete\u7684\u91cd\u8f7d<\/h4>\n
void* operator new(size_t size)\n{\n\tvoid* p = malloc(size);\n\tif (p == nullptr)\n\t{\n\t\tthrow std::bad_alloc();\n\t}\n\n\treturn p;\n}\n\n\nvoid* operator new[](size_t size)\n{\n\tvoid* p = malloc(size);\n\tif (p == nullptr)\n\t{\n\t\tthrow std::bad_alloc();\n\t}\n\n\treturn p;\n}\n\nvoid operator delete(void* p) noexcept {\n free(p);\n}\n\nvoid operator delete[](void* p) noexcept {\n free(p);\n}\n<\/code><\/pre>\n#include <iostream>\n#include <cstdlib> \/\/ \u7528\u4e8emalloc\u548cfree\n\nclass MyClass {\npublic:\n MyClass() {\n std::cout << "MyClass constructed" << std::endl;\n }\n\n ~MyClass() {\n std::cout << "MyClass destructed" << std::endl;\n }\n\n \/\/ \u91cd\u8f7dnew[]\u64cd\u4f5c\u7b26\n static void* operator new[](size_t size) {\n std::cout << "MyClass::operator new[] called with size " << size << std::endl;\n void* p = std::malloc(size);\n if (!p) {\n throw std::bad_alloc(); \/\/ \u5982\u679c\u5206\u914d\u5931\u8d25\uff0c\u629b\u51fa\u5f02\u5e38\n }\n return p;\n }\n\n \/\/ \u91cd\u8f7ddelete[]\u64cd\u4f5c\u7b26\n static void operator delete[](void* p) noexcept {\n std::cout << "MyClass::operator delete[] called" << std::endl;\n std::free(p);\n }\n\n \/\/ \u91cd\u8f7dnothrow\u7248\u672c\u7684new[]\u64cd\u4f5c\u7b26\n static void* operator new[](size_t size, const std::nothrow_t& nothrow_value) noexcept {\n std::cout << "MyClass::operator new[] (nothrow) called with size " << size << std::endl;\n void* p = std::malloc(size);\n return p; \/\/ \u6ce8\u610f\uff1anothrow\u7248\u672c\u4e0d\u5e94\u8be5\u629b\u51fa\u5f02\u5e38\n }\n\n \/\/ \u91cd\u8f7dnothrow\u7248\u672c\u7684delete[]\u64cd\u4f5c\u7b26\n static void operator delete[](void* p, const std::nothrow_t& nothrow_value) noexcept {\n std::cout << "MyClass::operator delete[] (nothrow) called" << std::endl;\n std::free(p);\n }\n};\n\nint main() {\n \/\/ \u4f7f\u7528\u91cd\u8f7d\u7684new[]\u548cdelete[]\n MyClass* myArray = new MyClass[5];\n delete[] myArray;\n\n \/\/ \u4f7f\u7528nothrow\u7248\u672c\u7684new[]\u548cdelete[]\n MyClass* myArrayNoThrow = new (std::nothrow) MyClass[5];\n delete[] myArrayNoThrow;\n\n return 0;\n}\n\n<\/code><\/pre>\noperator new<\/h3>\n
A* a = new A\uff1b\n<\/code><\/pre>\n\n
operator new(size_t)<\/code>\u6765\u5b8c\u6210\u7684,\u5982\u679c\u7c7b\u4e2d\u91cd\u8f7d\u4e86operator new \u5219\u5c06\u8c03\u7528A::operator new(size_t)<\/p>\n::operator new(size_t)<\/code><\/p>\noperator new\u7684\u4e09\u79cd\u7c7b\u578b<\/h4>\n
throwing (1) \nvoid* operator new (std::size_t size) throw (std::bad_alloc);\nnothrow (2) \nvoid* operator new (std::size_t size, const std::nothrow_t& nothrow_value) throw();\nplacement (3) \nvoid* operator new (std::size_t size, void* ptr) throw();\n<\/code><\/pre>\nbad_alloc<\/code>\u5f02\u5e38\uff0c\u540e\u8005\u8fd4\u56denull\uff0c\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\u3002\u5b83\u4eec\u90fd\u5206\u914d\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u8fde\u7eed\u5185\u5b58\u3002<\/p>\nA* a = new A; \/\/\u8c03\u7528throwing(1)\nA* a = new(std::nothrow) A; \/\/\u8c03\u7528nothrow(2)\n<\/code><\/pre>\n#include <new><\/code>\u4e2d\uff0c\u5b83\u591a\u63a5\u6536\u4e00\u4e2aptr\u53c2\u6570\uff0c\u4f46\u5b83\u53ea\u662f\u7b80\u5355\u5730\u8fd4\u56deptr\u3002<\/p>\nplacement new<\/code>\u540e\uff0c\u9700\u624b\u52a8\u8c03\u7528\u6790\u6784\u51fd\u6570\uff08\u800c\u975edelete<\/code>\uff09\uff0c\u4e14\u9700\u786e\u4fdd\u5185\u5b58\u7684\u6b63\u786e\u91ca\u653e\u3002<\/p>\ndelete\u4e0efree\u80fd\u5426\u6df7\u7528(new\u548cmalloc\u540c\u7406)<\/h4>\n
free<\/code>\u6765\u91ca\u653e\u7531new<\/code>\u5206\u914d\u7684\u5185\u5b58\uff0c\u6216\u8005\u4f7f\u7528delete<\/code>\u6765\u91ca\u653e\u7531malloc<\/code>\u7b49\u5206\u914d\u7684\u5185\u5b58<\/p>\nnew\u4e0enew[]\u80fd\u5426\u6df7\u7528(delete\u4e0edelete[]\u540c\u7406)<\/h4>\n
![](\"https:\/\/pic.vanforever.com.cn\/C%2B%2B\/20240606\/2024060604.png\")
<\/p>\n\n
\u6307\u9488\u8d8a\u754c\u673a\u5236<\/h4>\n
typedef struct _CrtMemBlockHeader \n{ \n\u3000\u3000\/\/ \u6307\u5411\u4e0b\u4e00\u5757\u6570\u636e\u5757\u7684\u6307\u9488 \n\u3000\u3000struct _CrtMemBlockHeader *pBlockHeaderNext; \n \/\/ \u6307\u5411\u524d\u4e00\u5757\u6570\u636e\u5757\u7684\u6307\u9488 \n struct _CrtMemBlockHeader *pBlockHeaderPrev; \n\n \/\/ File name\uff1a\u8bf7\u6c42\u5185\u5b58\u5206\u914d\u64cd\u4f5c\u7684\u90a3\u884c\u4ee3\u7801\u6240\u5728\u7684\u6587\u4ef6\u7684\u8def\u5f84\u548c\u540d\u79f0\uff0c\u4f46\u5b9e\u9645\u4e0a\u662f\u7a7a\u6307\u9488 \n char *szFileName; \n \/\/ Line number\uff1a\u884c\u53f7\uff0c\u8bf7\u6c42\u5185\u5b58\u5206\u914d\u64cd\u4f5c\u7684\u90a3\u884c\u4ee3\u7801\u7684\u884c\u53f7 \n int nLine; \n\n \/\/ \u8bf7\u6c42\u5206\u914d\u7684\u5927\u5c0f size_t nDataSize; \n\n \/\/ Type of block \u7c7b\u578b \n int nBlockUse; \n \/\/ \u8bf7\u6c42\u53f7 \n long lRequest; \n \/\/ \u8fd9\u4e2agap\uff0c\u6b63\u662fcpp\u4e2d\u5bf9\u4e8e\u6307\u9488\u7684\u754c\u9650 \n unsigned char gap[nNoMansLandSize];\n} _CrtMemBlockHeader;\n<\/code><\/pre>\ngap[]<\/code>\u7684\u4f5c\u7528\uff0c\u4f60\u6240\u7533\u8bf7\u7684\u7a7a\u95f4\u4e2d\u7684\u5185\u5bb9\u6211\u4eec\u5047\u5b9a\u4e3a<tdata><\/code>\u3002\u5728<tdata><\/code>\u7684\u524d\u540e\u5404\u67094\u4e2aB\uff08\u5b57\u8282\uff09\u7684gap[]<\/code>\uff0c\u4ed6\u5728\u5185\u5b58\u4e2d\u7684\u503c\u4e3a0xFD<\/code>\u3002\u8fd9\u6837\u7cfb\u7edf\u53ea\u9700\u8981\u68c0\u6d4b\u4f60\u7684<tdata><\/code>\u524d\u540e\u7684\u6570\u636e\u662f\u5426\u4e3a0xFD<\/code>\u5c31\u53ef\u77e5\u9053\u4f60\u6709\u6ca1\u6709\u8d8a\u754c\u3002<\/p>\n![](\"https:\/\/pic.vanforever.com.cn\/C%2B%2B\/20240606\/2024060605.png\")
<\/p>\n0X0000018e284c6af0<\/code>\u662fp\u6307\u9488\u6307\u5411\u7684\u5185\u5bb9,\u56e0\u4e3a\u6211\u4eec\u5e76\u6ca1\u6709\u521b\u5efa\u5185\u5bb9\u6240\u4ee5\u5728\u5185\u5b58\u4e2d\u4f7f\u75280xcd<\/code>\u8fdb\u884c\u586b\u5145\uff0c\u524d\u540e\u5404\u67094B\u76840xfd<\/code>\u6765\u8fdb\u884c\u9650\u5b9a\u3002<\/p>\ngap[]<\/code>\u4ee5\u53ca\u4ed6\u7684\u4f5c\u7528\uff0c\u90a3\u4e48\u6211\u4eec\u987a\u5229\u6210\u7ae0\u5730\u5c31\u4f1a\u60f3\u5230_CrtDumpMemoryLeaks()<\/code>\u8fd9\u4e2a\u51fd\u6570\uff0c\u4ed6\u5c31\u662f\u901a\u8fc7\u68c0\u67e5\u5185\u5b58\u5206\u914d\u94fe\u8868\uff08pBlockHeaderNext<\/code>\u548cpBlockHeaderPrev<\/code>\u4e3a\u53cc\u94fe\u8868\u7684\u53cc\u94fe\uff09, \u6765\u67e5\u627e\u662f\u5426\u6709\u6cc4\u6f0f\u3002<\/p>\n\u667a\u80fd\u6307\u9488<\/h2>\n
\u667a\u80fd\u6307\u9488\u7684\u7c7b\u578b<\/h3>\n
\n
\n
\n
\n
\n
std::unique_ptr<\/code>\u662f\u5177\u6709\u4e25\u683c\u62e5\u6709\u6027\u7684\u667a\u80fd\u6307\u9488\uff0c\u610f\u5473\u7740\u5b83\u62e5\u6709\u6240\u6307\u5411\u5bf9\u8c61\u7684\u552f\u4e00\u6240\u6709\u6743\u3002<\/p>\n<\/li>\nstd::unique_ptr<\/code>\u590d\u5236\u7ed9\u53e6\u4e00\u4e2astd::unique_ptr<\/code>\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7std::move<\/code>\u8fdb\u884c\u6240\u6709\u6743\u7684\u8f6c\u79fb\u3002\u8fd9\u5c31\u662f\u8bf4\u6211\u4eec\u53ef\u4ee5\u62f7\u8d1d\u6216\u8d4b\u503c\u4e00\u4e2a\u5c06\u8981\u88ab\u9500\u6bc1\u7684unique_ptr<\/code>(\u4e5f\u5c31\u662f\u53f3\u503c)<\/p>\n<\/li>\nstd::unique_ptr<\/code>\u88ab\u9500\u6bc1\u65f6\uff0c\u5b83\u6240\u62e5\u6709\u7684\u5bf9\u8c61\u4e5f\u4f1a\u88ab\u81ea\u52a8\u5220\u9664\u3002<\/p>\n<\/li>\nunique_ptr<\/code> \u5728\u6307\u5b9a\u81ea\u5b9a\u4e49\u5220\u9664\u5668\u65f6\u9700\u8981\u663e\u5f0f\u5730\u63d0\u4f9b\u5220\u9664\u5668\u7684\u7c7b\u578b\u4f5c\u4e3a\u6a21\u677f\u53c2\u6570\uff0c\u800c shared_ptr<\/code> \u5219\u4e0d\u9700\u8981\u3002\u5199\u5220\u9664\u5668\u7684\u539f\u56e0\u662f\u5e76\u4e0d\u662f\u6240\u6709\u8d44\u6e90\u90fd\u662f\u901a\u8fc7 delete<\/code> \u6765\u91ca\u653e\u7684\u3002<\/strong>\u6709\u4e9b\u8d44\u6e90\uff0c\u5982\u6587\u4ef6\u53e5\u67c4\u3001\u7f51\u7edc\u8fde\u63a5\u3001\u4e92\u65a5\u9501\u7b49\uff0c\u9700\u8981\u901a\u8fc7\u7279\u5b9a\u7684\u51fd\u6570\u6765\u91ca\u653e\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u9ed8\u8ba4\u7684\u5220\u9664\u5668\u5c31\u4e0d\u9002\u7528\u4e86\uff0c\u6211\u4eec\u9700\u8981\u4e3a\u667a\u80fd\u6307\u9488\u63d0\u4f9b\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684\u5220\u9664\u5668\u3002<\/p>\n<\/li>\nrelease<\/code>\u51fd\u6570\u8fd4\u56de\u667a\u80fd\u6307\u9488\u5f53\u524d\u6240\u7ba1\u7406\u7684\u88f8\u6307\u9488\u3002\u8c03\u7528release()<\/strong> \u4f1a\u5207\u65adunique_ptr (\u975econst)\u548c\u5b83\u539f\u6765\u7ba1\u7406\u7684\u5bf9\u8c61\u7684\u8054\u7cfb\u3002release \u8fd4\u56de\u7684\u6307\u9488\u901a\u5e38\u88ab\u7528\u6765\u521d\u59cb\u5316\u53e6\u4e00\u4e2a\u667a\u80fd\u6307\u9488\u6216\u7ed9\u53e6\u4e00\u4e2a\u667a\u80fd\u6307\u9488\u8d4b\u503c\u3002\u5982\u679c\u4e0d\u7528\u53e6\u4e00\u4e2a\u667a\u80fd\u6307\u9488\u6765\u4fdd\u5b58release\u8fd4\u56de\u7684\u6307\u9488\uff0c\u7a0b\u5e8f\u5c31\u8981\u8d1f\u8d23\u8d44\u6e90\u7684\u91ca\u653e\u3002<\/p>\n<\/li>\nstd::unique_ptr<int> ptr1(new int(10));\nptr1.reset(new int(20)); \/\/ \u91ca\u653e\u65e7\u7684int\uff0c\u5e76\u6307\u5411\u65b0\u7684int\nptr1.reset(nullptr); \/\/ \u91ca\u653e\u5f53\u524d\u7684int\uff0cptr1\u53d8\u4e3a\u7a7a\n<\/code><\/pre>\n\n
\n