{"id":90685,"date":"2026-08-05T19:49:09","date_gmt":"2026-08-05T11:49:09","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/90685.html"},"modified":"2026-08-05T19:49:09","modified_gmt":"2026-08-05T11:49:09","slug":"%e6%9d%a1%e6%ac%be16%ef%bc%9a%e4%bf%9d%e8%af%81const%e6%88%90%e5%91%98%e5%87%bd%e6%95%b0%e7%9a%84%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/90685.html","title":{"rendered":"\u6761\u6b3e16\uff1a\u4fdd\u8bc1const\u6210\u5458\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

\u6761\u6b3e16（\u6210\u5458\u51fd\u6570）：\u4fdd\u8bc1const\u6210\u5458\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168（Make const member functions thread safe）<\/p>\n

\u4e92\u65a5\u91cf：\u591a\u4e2a\u53d8\u91cf\/\u5185\u5b58\u4f4d\u7f6e<\/p>\n

\u539f\u5b50\u53d8\u91cf：\u5355\u4e2a\u53d8\u91cf\/\u5185\u5b58\u4f4d\u7f6e<\/p>\n

\u7efc\u5408\u6bd4\u8f83<\/p>\n

\u5c0f\u7ed3<\/p>\n

\n

\u6761\u6b3e16（\u6210\u5458\u51fd\u6570）：\u4fdd\u8bc1const\u6210\u5458\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168（Make <\/span>const member functions<\/span> thread safe<\/span>）<\/h2>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u65e2\u7136const\u6210\u5458\u51fd\u6570（\u53ea\u8bfb\u64cd\u4f5c）\u627f\u8bfa\u4e0d\u4f1a\u4fee\u6539\u5bf9\u8c61\u7684\u6210\u5458\u6570\u636e，\u90a3\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981\u4fdd\u8bc1\u5176\u7ebf\u7a0b\u5b89\u5168\u6027\u3002\u8fd9\u5176\u5b9e\u662f\u5bf9const\u6210\u5458\u51fd\u6570\u7684\u8bef\u89e3\u3002const\u6210\u5458\u51fd\u6570\u5b58\u5728\u4e24\u79cd\u89e3\u8bfb：\u4e00\u79cd\u662fbitwise constness（\u4f4d\u5e38\u91cf\u6027\/\u7269\u7406\u5e38\u91cf\u6027），\u8fd9\u662f\u7f16\u8bd1\u5668\u9075\u5faa\u7684\u89c4\u5219，\u53ea\u8981\u5bf9\u8c61\u6570\u636e\u7684\u4efb\u4f55\u4e00\u4e2a\u6bd4\u7279\u4f4d\u53d1\u751f\u53d8\u5316，\u5c31\u8ba4\u4e3a\u662f\u4fee\u6539\u4e86\u5bf9\u8c61；\u53e6\u4e00\u79cd\u662flogical constness（\u903b\u8f91\u5e38\u91cf\u6027），\u8fd9\u662f\u7a0b\u5e8f\u5458\u6a21\u62df\u7684\u89c4\u5219，\u53ef\u80fd\u5b58\u5728\u67d0\u4e9b\u8f85\u52a9\u53d8\u91cf\u53d1\u751f\u53d8\u5316，\u4e5f\u8ba4\u4e3a\u662f\u4ece\u4e1a\u52a1\u903b\u8f91\u4e0a\u770b\u5bf9\u8c61\u4f9d\u7136\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n

\u4e92\u65a5\u91cf：\u591a\u4e2a\u53d8\u91cf\/\u5185\u5b58\u4f4d\u7f6e<\/h3>\n

\u6848\u4f8b\u5206\u6790<\/span>：\u8003\u8651\u4e00\u4e2a\u7528\u4e8e\u8868\u793a\u201c\u591a\u9879\u5f0f（Polynomial）\u201d\u7684\u7c7b<\/p>\n

    \n
  • \u6210\u5458\u53d8\u91cf<\/span>：coeffs（\u56fe\u4e2d\u672a\u663e\u793a）\n
      \n
    • \u7c7b\u578b<\/span>：std::vector<double><\/li>\n
    • \u4f5c\u7528<\/span>：\u5b58\u50a8<\/span>\u591a\u9879\u5f0f\u7684\u7cfb\u6570<\/span>\u00a0 \u2192\u00a0 coeffs[i] = xi\u7684\u7cfb\u6570<\/li>\n
    • \u793a\u4f8b<\/span>：3x\u00b2 + 2x + 1\u5b58\u50a8\u4e3acoeffs = {1, 2, 3}<\/li>\n<\/ul>\n<\/li>\n
    • \u6210\u5458\u51fd\u6570<\/span>：roots()<\/span>\n
        \n
      • \u4f5c\u7528<\/span>：\u8ba1\u7b97<\/span>\u591a\u9879\u5f0f\u7684\u6839<\/span>（\u591a\u9879\u5f0f=0\u7684\u89e3）<\/li>\n
      • \u8fd4\u56de\u503c<\/span>：\u5b58\u50a8<\/span>\u591a\u9879\u5f0f\u7684\u6839<\/span>，RootsType\u7c7b\u578b（std::vector<double>\u7684\u522b\u540d）<\/li>\n
      • \u5e38\u91cf\u6027<\/span>：\u7531\u4e8e\u8be5\u51fd\u6570\u5728\u903b\u8f91\u4e0a\u4e0d\u4f1a\u4fee\u6539<\/span>\u591a\u9879\u5f0f\u7684\u7cfb\u6570<\/span>，\u56e0\u6b64\u5c06\u5b83\u58f0\u660e\u4e3a<\/span>const<\/span>\u6210\u5458\u51fd\u6570<\/span>\u662f\u5408\u7406\u7684<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

        \u5b9e\u73b0<\/span>1<\/span>（\u4e0d\u53ef\u884c）<\/span>：\u4e0d\u7f13\u5b58<\/span>\u591a\u9879\u5f0f\u7684\u6839，\u5929\u7136\u5177\u5907<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

          \n
        • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：\u5728\u6bcf\u6b21\u8c03\u7528roots()\u65f6，\u90fd\u91cd\u65b0\u8ba1\u7b97\u591a\u9879\u5f0f\u7684\u6839，\u5e76\u5c06\u7ed3\u679c\u8fd4\u56de，\u800c\u4e0d\u8fdb\u884c\u4efb\u4f55\u7f13\u5b58\u3002<\/li>\n<\/ul>\n

          \"\"<\/p>\n

            \n
          • \u95ee\u9898\u5206\u6790<\/span>：\u8ba1\u7b97\u591a\u9879\u5f0f\u7684\u6839\u53ef\u80fd\u4ee3\u4ef7\u9ad8\u6602<\/span>，\u56e0\u6b64\u6211\u4eec\u901a\u5e38\u5e0c\u671b<\/span>\u5c3d\u91cf\u907f\u514d\u6267\u884c\u8fd9\u4e00\u8ba1\u7b97<\/span>，\u9664\u975e\u786e\u5b9e\u4e0d\u53ef\u907f\u514d\u3002\u4e00\u65e6\u5fc5\u987b\u8fdb\u884c\u8be5\u8ba1\u7b97，\u6211\u4eec\u4e5f\u5e0c\u671b<\/span>\u53ea\u6267\u884c\u4e00\u6b21<\/span>，\u800c\u4e0d\u662f\u91cd\u590d\u8fdb\u884c\u76f8\u540c\u7684\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n

            \u5b9e\u73b0<\/span>2<\/span>（\u4e0d\u53ef\u884c）<\/span>：\u7f13\u5b58<\/span>\u591a\u9879\u5f0f\u7684\u6839，\u4f46\u4e0d\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

              \n
            • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：\u4e3a\u4e86\u907f\u514d\u91cd\u590d\u8ba1\u7b97，\u53ef\u4ee5\u5f15\u5165\u7f13\u5b58\u673a\u5236\u3002\u5177\u4f53\u5730，\u5728\u201c\u9996\u6b21\u8ba1\u7b97\u201d<\/span>\u591a\u9879\u5f0f\u7684\u6839\u65f6，\u5c06\u8fd9\u4e9b\u6839\u7f13\u5b58\u8d77\u6765\u3002\u5728\u8fd4\u56de\u503c\u65b9\u9762，\u91c7\u7528\u201c\u8fd4\u56de\u7f13\u5b58\u503c\u201d<\/span>\u7684\u624b\u6cd5\u3002\n
                \n
              • rootsAreValid=false<\/span>：\u7f13\u5b58\u503crootVals\u4e0d\u53ef\u7528<\/span> \u2192 \u8ba1\u7b97<\/span>\u591a\u9879\u5f0f\u7684\u6839（<\/span>\u5e76\u7f13\u5b58）<\/span>，\u518d\u8fd4\u56de<\/span>\u7f13\u5b58\u503c<\/li>\n
              • rootsAreValid =true<\/span>：\u7f13\u5b58\u503crootVals\u53ef\u7528<\/span> \u2192 \u76f4\u63a5\u8fd4\u56de<\/span>\u7f13\u5b58\u503c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                \"\"<\/p>\n

                  \n
                • \u5b9e\u73b0\u7ec6\u8282<\/span>：\u7406\u8bba\u4e0a，const\u6210\u5458\u51fd\u6570\u627f\u8bfa\u4e0d\u4f1a\u4fee\u6539<\/span>\u5b83\u64cd\u4f5c\u7684Polynomial<\/span>\u5bf9\u8c61<\/span>\u3002\u5b9e\u9645\u4e0a，const\u6210\u5458\u51fd\u6570\u7684\u786e\u9700\u8981\u4fee\u6539<\/span>Polynomial<\/span>\u5bf9\u8c61<\/span>（\u7f13\u5b58\u6807\u5fd7rootsAreValid\u548c\u7f13\u5b58\u503crootVals），\u4ee5\u5b9e\u73b0\u201c\u7f13\u5b58\u591a\u9879\u5f0f\u6839\u201d\u7684\u529f\u80fd\u3002\u8fd9\u4e24\u8005\u5e76\u4e0d\u5b58\u5728\u77db\u76fe<\/span>，\u5177\u4f53\u5206\u6790\u5982\u4e0b：\u8fd9\u4e24\u4e2a\u6210\u5458\u5e76\u4e0d\u5c5e\u4e8e<\/span>Polynomial<\/span>\u5bf9\u8c61\u7684\u4e00\u90e8\u5206<\/span>（\u53ea\u6709\u591a\u9879\u5f0f\u7684\u7cfb\u6570\u624d\u5c5e\u4e8ePolynomial\u5bf9\u8c61），\u800c\u5c5e\u4e8e<\/span>\u5b9e\u73b0\u5c42\u9762\u7684\u8f85\u52a9\u6210\u5458<\/span>（\u4ec5\u7528\u4e8e\u7f13\u5b58\u8ba1\u7b97\u7ed3\u679c）\u3002\u5b83\u4eec\u662f\u5426\u53d1\u751f\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd\u5bf9\u8c61\u672c\u8eab（\u4e0d\u4f1a\u6539\u53d8\u591a\u9879\u5f0f\u672c\u8eab\u7684\u6570\u5b66\u542b\u4e49）\u3002\u56e0\u6b64，\u5c06\u5b83\u4eec\u58f0\u660e\u4e3amutable，\u4f7f\u5f97const\u6210\u5458\u51fd\u6570\u53ef\u4ee5\u4fee\u6539<\/span>\u8fd9\u4e9b\u6210\u5458<\/span>（\u5426\u5219\u7f16\u8bd1\u4e0d\u4f1a\u901a\u8fc7）（mutable\u5173\u952e\u5b57\u7684\u7ecf\u5178\u7528\u4f8b）\u3002<\/li>\n
                • \u95ee\u9898\u5206\u6790<\/span>：\u5f15\u5165\u7f13\u5b58\u7684\u76f8\u5173\u6210\u5458\u540e，\u4f1a\u7834\u574f\u7ebf\u7a0b\u5b89\u5168\u6027\u3002<\/span>\u7406\u8bba\u4e0a，const\u6210\u5458\u51fd\u6570\u901a\u5e38\u88ab\u89c6\u4e3a<\/span>\u53ea\u8bfb\u64cd\u4f5c<\/span>，\u56e0\u6b64\u4eba\u4eec\u5f80\u5f80\u8ba4\u4e3a\u591a\u4e2a\u7ebf\u7a0b<\/span>\u5728\u6ca1\u6709\u989d\u5916\u540c\u6b65\u673a\u5236\u7684\u60c5\u51b5\u4e0b\u540c\u65f6\u8c03\u7528<\/span>const<\/span>\u6210\u5458\u51fd\u6570<\/span>\u662f\u5b89\u5168\u7684<\/span>，\u6216\u8005\u81f3\u5c11\u5e94\u5f53\u88ab\u89c6\u4e3a\u5b89\u5168\u7684\u3002\u8fd9\u79cd\u7406\u89e3\u7684\u524d\u63d0\u662f：const \u6210\u5458\u51fd\u6570\u4e0d\u4f1a\u4fee\u6539\u5bf9\u8c61\u7684\u72b6\u6001，\u53ea\u6267\u884c\u8bfb\u53d6\u64cd\u4f5c\u3002\u5b9e\u9645\u4e0a（\u7136\u800c），\u8fd9\u79cd\u5047\u8bbe\u5e76\u4e0d\u603b\u662f\u6210\u7acb\u3002const\u6210\u5458\u51fd\u6570\u867d\u7136\u4e0d\u80fd\u4fee\u6539<\/span>\u666e\u901a\u6210\u5458\u53d8\u91cf<\/span>，\u4f46\u4ecd\u7136\u53ef\u4ee5\u4fee\u6539<\/span>\u88ab\u58f0\u660e\u4e3a<\/span>mutable<\/span>\u7684\u6210\u5458\u53d8\u91cf<\/span>\u3002\u5728\u6b64\u79cd\u60c5\u51b5\u4e0b，\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8c03\u7528<\/span>const<\/span>\u6210\u5458\u51fd\u6570<\/span>\u662f\u4e0d\u5b89\u5168\u7684<\/span>，\u53ef\u80fd\u5728\u6ca1\u6709\u540c\u6b65\u7684\u60c5\u51b5\u4e0b\u8bfb\u5199\u540c\u4e00\u5757\u5185\u5b58，\u5f15\u53d1\u6570\u636e\u7ade\u4e89（data race），\u4ece\u800c\u5bfc\u81f4\u672a\u5b9a\u4e49\u884c\u4e3a\u3002\u56e0\u6b64，\u9700\u8981\u4fee\u6b63\u7ebf\u7a0b\u5b89\u5168\u6027\u7684\u7f3a\u5931\u3002<\/li>\n<\/ul>\n

                  \"\"<\/p>\n

                  \u5b9e\u73b0<\/span>3<\/span>（\u53ef\u884c）<\/span>：\u7f13\u5b58<\/span>\u591a\u9879\u5f0f\u7684\u6839，\u540c\u65f6\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                    \n
                  • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：\u4f7f\u7528\u6807\u51c6\u5e93\u63d0\u4f9b\u7684\u4e92\u65a5\u9501std::mutex\n
                      \n
                    • \u5728\u521b\u5efalock_guard\u5bf9\u8c61\u65f6（\u5230\u8fbe\u5b9a\u4e49\u5f0f），\u6784\u9020\u51fd\u6570\u5185\u90e8\u5bf9\u4e92\u65a5\u9501\u8fdb\u884c\u52a0\u9501\u3002<\/li>\n
                    • \u5728\u9500\u6bc1lock_guard\u5bf9\u8c61\u65f6（\u9000\u51fa\u4f5c\u7528\u57df），\u6790\u6784\u51fd\u6570\u5185\u90e8\u5bf9\u4e92\u65a5\u9501\u8fdb\u884c\u89e3\u9501\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                      \"\"<\/p>\n

                        \n
                      • \u5b9e\u73b0\u7ec6\u8282<\/span>：std::mutex m\u88ab\u58f0\u660e\u4e3amutable，\u5426\u5219\u5728const\u6210\u5458\u51fd\u6570\u5185\u90e8\u5c06\u88ab\u89c6\u4e3aconst\u5bf9\u8c61，\u65e0\u6cd5\u52a0\u9501\u548c\u89e3\u9501\u3002<\/li>\n
                      • \u6ce8\u610f\u4e8b\u9879<\/span>：\u7531\u4e8estd::mutex\u662f\u4e00\u79cd\u4ec5\u53ef\u79fb\u52a8\u7c7b\u578b（<\/span>move-only type<\/span>）<\/span>（\u5373\u53ea\u80fd<\/span>\u79fb\u52a8<\/span>\u4f46\u4e0d\u80fd<\/span>\u62f7\u8d1d<\/span>\u7684\u7c7b\u578b），\u5c06m\u6dfb\u52a0\u5230Polynomial\u7684\u526f\u4f5c\u7528\u5c31\u662f\u5bfc\u81f4<\/span>Polynomial<\/span>\u5931\u53bb\u201c\u53ef\u62f7\u8d1d\u6027\u201d<\/span>（\u4f46\u4ecd\u7136\u53ef\u79fb\u52a8）\u3002<\/li>\n<\/ul>\n

                        \u539f\u5b50\u53d8\u91cf：\u5355\u4e2a\u53d8\u91cf\/\u5185\u5b58\u4f4d\u7f6e<\/h3>\n

                        \u6848\u4f8b\u5206\u6790<\/span>：\u8003\u8651\u4e00\u4e2a\u7528\u4e8e\u8868\u793a\u201c\u4e8c\u7ef4\u70b9（Point）\u201d\u7684\u7c7b<\/p>\n

                          \n
                        • \u6210\u5458\u53d8\u91cf<\/span>：double x, y; \u8868\u793a\u4e8c\u7ef4\u70b9\u7684x\u548cy\u5750\u6807<\/span><\/li>\n
                        • \u6210\u5458\u51fd\u6570<\/span>：distanceFromOrigin() \u8ba1\u7b97\u5f53\u524d\u70b9\u5230\u539f\u70b9\u7684\u8ddd\u79bb<\/span><\/li>\n
                        • \u4e1a\u52a1\u9700\u6c42<\/span>：\u7edf\u8ba1\u6210\u5458\u51fd\u6570\u88ab\u8c03\u7528\u7684\u6b21\u6570<\/li>\n<\/ul>\n

                          \u5b9e\u73b0<\/span>1<\/span>（\u4e0d\u53ef\u884c）<\/span>：\u4e0d\u8ba1\u7b97<\/span>\u8c03\u7528\u6b21\u6570，\u5929\u7136\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                            \n
                          • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：<\/li>\n<\/ul>\n

                            \"\"<\/p>\n

                              \n
                            • \u95ee\u9898\u5206\u6790<\/span>：\u4e0d\u6ee1\u8db3\u4e1a\u52a1\u9700\u6c42<\/li>\n<\/ul>\n

                              \u5b9e\u73b0<\/span>2<\/span>（\u4e0d\u53ef\u884c）<\/span>：\u8ba1\u7b97<\/span>\u8c03\u7528\u6b21\u6570，\u4f46<\/span>\u4e0d\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                                \n
                              • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：\u4e3a\u4e86\u7edf\u8ba1\u51fd\u6570\u8c03\u7528\u6b21\u6570，\u53ef\u4ee5\u5f15\u5165\u201c\u6574\u578b\u8ba1\u6570\u5668\u201d<\/span>\u3002\u5177\u4f53\u5730，\u6bcf\u8c03\u7528\u4e00\u6b21\u51fd\u6570，\u5bf9\u8ba1\u6570\u5668\u8fdb\u884c\u81ea\u589e\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n

                                \"\"<\/p>\n

                                  \n
                                • \u95ee\u9898\u5206\u6790<\/span>：\u5f15\u5165\u8ba1\u6570\u5668\u7684\u76f8\u5173\u6210\u5458\u540e，\u4f1a\u7834\u574f\u7ebf\u7a0b\u5b89\u5168\u6027\u3002<\/span><\/li>\n<\/ul>\n

                                  \u5b9e\u73b0<\/span>3<\/span>（\u53ef\u884c，\u4e0d\u63a8\u8350）<\/span>：\u8ba1\u7b97<\/span>\u8c03\u7528\u6b21\u6570，\u540c\u65f6\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                                    \n
                                  • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：\u5229\u7528\u201c\u4e92\u65a5\u91cf\u201d<\/span><\/li>\n<\/ul>\n

                                    \"\"<\/p>\n

                                      \n
                                    • \u95ee\u9898\u5206\u6790<\/span>：\u4e92\u65a5\u91cf\u7684\u6210\u672c\u8f83\u9ad8<\/span>（\u6740\u9e21\u7528\u725b\u5200\u4e4b\u4e3e）\u3002<\/li>\n<\/ul>\n

                                      \u5b9e\u73b0<\/span>4<\/span>（\u53ef\u884c，\u63a8\u8350）<\/span>：\u8ba1\u7b97<\/span>\u8c03\u7528\u6b21\u6570，\u540c\u65f6\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                                        \n
                                      • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：\u5229\u7528\u201c\u539f\u5b50\u53d8\u91cf\u201d<\/span>（\u4f7f\u7528std::atomic\u7c7b\u578b\u7684\u8ba1\u6570\u5668）<\/li>\n<\/ul>\n

                                        \"\"<\/p>\n

                                          \n
                                        • \u6027\u80fd\u5206\u6790<\/span>：\u539f\u5b50\u53d8\u91cf\u7684\u6210\u672c\u8f83\u4f4e<\/span>（\u662f\u5426\u771f\u7684\u6210\u672c\u8f83\u4f4e，\u53d6\u51b3\u4e8e\u786c\u4ef6\u4ee5\u53ca\u6240\u4f7f\u7528\u6807\u51c6\u5e93\u4e2d\u4e92\u65a5\u91cf\u7684\u5b9e\u73b0）\u3002<\/li>\n
                                        • \u6ce8\u610f\u4e8b\u9879<\/span>：\u4e0estd::mutex\u4e00\u6837，std::atomic\u4e5f\u662f\u4e00\u79cd\u4ec5\u53ef\u79fb\u52a8\u7c7b\u578b<\/span>，\u5c06callCount\u6dfb\u52a0\u5230Point\u7684\u526f\u4f5c\u7528\u5c31\u662f\u5bfc\u81f4<\/span>Point<\/span>\u5931\u53bb\u201c\u53ef\u62f7\u8d1d\u6027\u201d<\/span>（\u4f46\u4ecd\u7136\u53ef\u79fb\u52a8）\u3002<\/li>\n<\/ul>\n

                                          \u7efc\u5408\u6bd4\u8f83<\/h3>\n

                                          \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u7531\u4e0a\u53ef\u77e5，\u4e0e\u201cstd::mutex\u7684\u52a0\u9501\u3001\u89e3\u9501\u201d\u64cd\u4f5c\u76f8\u6bd4，\u201cstd::atomic\u7c7b\u578b\u53d8\u91cf\u201d\u64cd\u4f5c\u901a\u5e38\u5177\u6709\u66f4\u4f4e\u7684\u5f00\u9500<\/span>\u3002\u56e0\u6b64，\u4eba\u4eec\u53ef\u80fd\u4f1a\u8fc7\u5ea6\u4f9d\u8d56std::atomic\u7c7b\u578b\u7684\u5bf9\u8c61\u3002<\/p>\n

                                          \u5b9e\u73b0<\/span>1<\/span>（\u4e0d\u53ef\u884c）<\/span>：\u4e0d\u7f13\u5b58<\/span>\u8ba1\u7b97\u7ed3\u679c，\u5929\u7136\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                                          \"\"<\/p>\n

                                          \u5b9e\u73b0<\/span>2<\/span>（\u4e0d\u53ef\u884c）<\/span>：\u7f13\u5b58<\/span>\u8ba1\u7b97\u7ed3\u679c，\u4f46\u4e0d\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                                          \"\"<\/p>\n

                                          \u5b9e\u73b0<\/span>3<\/span>（\u53ef\u884c，\u63a8\u8350）<\/span>：\u7f13\u5b58<\/span>\u8ba1\u7b97\u7ed3\u679c，\u540c\u65f6\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                                          \"\"<\/p>\n

                                          \u5b9e\u73b0<\/span>4.1<\/span>（\u53ef\u884c，\u4e0d\u63a8\u8350）<\/span>：\u7f13\u5b58<\/span>\u8ba1\u7b97\u7ed3\u679c，\u540c\u65f6\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                                            \n
                                          • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：\u5c1d\u8bd5\u4f7f\u7528\u4e00\u5bf9std::atomic\u7c7b\u578b\u7684\u53d8\u91cf\u6765\u53d6\u4ee3\u4e92\u65a5\u91cf\u3002<\/li>\n<\/ul>\n

                                            \"\"<\/p>\n

                                              \n
                                            • \u95ee\u9898\u5206\u6790<\/span>：\u96be\u4ee5\u907f\u514d\u6709\u65f6\u51fa\u73b0\u91cd\u590d\u8ba1\u7b97\u7684\u60c5\u51b5（\u5206\u6790\u5982\u4e0b），\u4ece\u800c\u8fdd\u80cc\u201c\u4f7f\u7528\u7f13\u5b58\u201d\u7684\u76ee\u3002\n
                                                \n
                                              • \u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528magicValue()\u65f6，\u89c2\u5bdf\u5230cacheValid\u4e3afalse，\u56e0\u6b64\u6267\u884c\u8fd9\u4e24\u4e2a\u5f00\u9500\u8f83\u5927\u7684\u8ba1\u7b97，\u5e76\u5c06\u5176\u548c\u8d4b\u503c\u7ed9cachedValue\u3002<\/li>\n
                                              • \u4e0e\u6b64\u540c\u65f6，\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u4e5f\u5728\u8c03\u7528magicValue()，\u4e5f\u89c2\u5bdf\u5230cacheValid\u4e3afalse，\u56e0\u6b64\u6267\u884c\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u521a\u521a\u5b8c\u6210\u7684\u4e24\u6b21\u540c\u6837\u7684\u5927\u5f00\u9500\u8ba1\u7b97\u3002（\u6b64\u5904\u201c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u201d\u5b9e\u9645\u4e0a\u6709\u53ef\u80fd\u662f\u53e6\u5916\u82e5\u5e72\u4e2a\u7ebf\u7a0b）<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                \u5b9e\u73b0<\/span>4.2<\/span>（\u4e0d\u53ef\u884c）<\/span>：\u7f13\u5b58<\/span>\u8ba1\u7b97\u7ed3\u679c，\u540c\u65f6\u4fdd\u8bc1<\/span>\u591a\u7ebf\u7a0b\u5b89\u5168\u6027<\/p>\n

                                                  \n
                                                • \u7a0b\u5e8f\u8bbe\u8ba1<\/span>：\u5c06cachedValue\u548cCacheValid\u7684\u8d4b\u503c\u987a\u5e8f\u4ea4\u6362\u3002<\/li>\n<\/ul>\n

                                                  \"\"<\/p>\n

                                                    \n
                                                  • \u95ee\u9898\u5206\u6790<\/span>：\u5c3d\u7ba1\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u89e3\u51b3\u91cd\u590d\u8ba1\u7b97\u7684\u95ee\u9898，\u4f46\u7ed3\u679c\u66f4\u7cdf\u7cd5\u4e86\u3002\u5047\u8bbecacheValid\u662ffalse，\u90a3\u4e48：\n
                                                      \n
                                                    • \u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528magicValue()，\u521a\u6267\u884c\u5b8c\u5c06cacheValid\u8bbe\u7f6etrue\u7684\u8bed\u53e5\u3002<\/li>\n
                                                    • \u6b64\u65f6，\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u4e5f\u5728\u8c03\u7528magicValue()，\u5e76\u68c0\u67e5cacheValid\u7684\u503c\u3002\u89c2\u5bdf\u5230\u5176\u503c\u4e3atrue\u540e，\u8be5\u7ebf\u7a0b\u5c31\u8fd4\u56decacheValue\u503c，\u5373\u4f7f\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u8fd8\u6ca1\u6709\u6267\u884c\u5bf9cacheValue\u7684\u8d4b\u503c\u3002\u56e0\u6b64，\u8fd4\u56de\u503c\u662f\u4e0d\u6b63\u786e\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                      \u5c0f\u7ed3<\/h3>\n

                                                      \u7ed3\u8bba<\/span>1.1<\/span>：\u201c\u4f7f\u7528std::atomic\u7c7b\u578b\u7684\u53d8\u91cf\u201d\u4f1a\u6bd4\u201c\u4f7f\u7528\u4e92\u65a5\u91cf\u201d\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u3002<\/p>\n

                                                      \u7ed3\u8bba<\/span>1.2<\/span>：\u5bf9\u4e8e\u5355\u4e2a<\/span>\u8981\u6c42\u540c\u6b65\u7684\u53d8\u91cf\u6216\u5185\u5b58\u533a\u57df，\u4f7f\u7528\u539f\u5b50\u53d8\u91cf<\/span>std::atomic<\/span>\u5c31\u8db3\u591f\u4e86\u3002\u7136\u800c，\u5982\u679c\u6709\u4e24\u4e2a\u6216\u66f4\u591a\u4e2a<\/span>\u7684\u53d8\u91cf\u6216\u5185\u5b58\u533a\u57df\u4f5c\u4e3a\u4e00\u6574\u4e2a\u5355\u5143\u8fdb\u884c\u64cd\u4f5c\u65f6，\u5c31\u5e94\u8be5\u4f7f\u7528\u4e92\u65a5\u91cf<\/span>std::mutex<\/span>\u3002（\u91cd\u8981！！！<\/span>）<\/p>\n

                                                      \u7ed3\u8bba<\/span>2<\/span>：\u786e\u4fddconst\u6210\u5458\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168\u6027，\u9664\u975e\u53ef\u4ee5\u786e\u4fe1\u5b83\u4eec\u4e0d\u4f1a\u7528\u5728\u5e76\u53d1\u8bed\u5883\u4e2d\u3002<\/p>\n

                                                      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u73b0\u5728，\u672c\u6761\u6b3e\u7684\u9648\u8ff0\u90fd\u662f\u57fa\u4e8e\u8fd9\u6837\u7684\u5047\u8bbe，\u5373\u591a\u4e2a\u7ebf\u7a0b<\/span>\u4f1a\u540c\u65f6\u8c03\u7528\u5728\u540c\u4e00\u4e2a\u5bf9\u8c61<\/span>\u7684\u540c\u4e00\u4e2a<\/span>const<\/span>\u6210\u5458\u51fd\u6570<\/span>\u3002\u5982\u679c\u64b0\u5199\u7684\u6210\u5458\u51fd\u6570\u5e76\u4e0d\u7b26\u5408\u8fd9\u79cd\u60c5\u51b5<\/span>（\u6362\u8a00\u4e4b，\u53ef\u4ee5\u4fdd\u8bc1\u6c38\u8fdc\u4e0d\u4f1a\u6709\u591a\u4e8e\u4e00\u4e2a\u7ebf\u7a0b<\/span>\u6765\u8c03\u7528\u5728\u540c\u4e00\u4e2a\u5bf9\u8c61<\/span>\u4e0a\u8be5\u6210\u5458\u51fd\u6570<\/span>），\u90a3\u4e48\u8be5\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168\u662f\u65e0\u5173\u7d27\u8981\u7684（\u53ef\u6709\u53ef\u65e0\u7684）<\/span>\u3002<\/p>\n

                                                      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6bd4\u5982，\u4e3a\u72ec\u5360\u5355\u7ebf\u7a0b\u4f7f\u7528\u800c\u8bbe\u8ba1\u7684\u7c7b，\u5176\u6210\u5458\u51fd\u6570\u662f\u5426\u5177\u5907\u7ebf\u7a0b\u5b89\u5168\u6027\u5e76\u4e0d\u91cd\u8981\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b，\u4f60\u53ef\u4ee5\u907f\u514d<\/span>\u7531\u4e8e\u4f7f\u7528\u201c\u4e92\u65a5\u91cf\u548cstd::atomic\u7c7b\u578b\u7684\u5bf9\u8c61\u201d\u6240\u5e26\u6765\u7684\u5f00\u9500<\/span>，\u540c\u65f6\u8fd8\u53ef\u4ee5\u6d88\u9664<\/span>\u201c\u5305\u542b\u5b83\u4eec\u7684\u7c7b\u201d\u53d8\u6210\u201c\u53ea\u80fd\u79fb\u52a8\u4e0d\u53ef\u62f7\u8d1d\u7c7b\u201d\u7684\u526f\u4f5c\u7528<\/span>\u3002<\/p>\n

                                                      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7136\u800c，\u8fd9\u79cd\u7ebf\u7a0b\u65e0\u5173\u7684\u573a\u5408\u6b63\u5728\u53d8\u5f97<\/span>\u8d8a\u6765\u8d8a\u7f55\u89c1<\/span>，\u800c\u4e14\u4f1a\u53d8\u5f97<\/span>\u66f4\u52a0\u7f55\u89c1<\/span>\u3002\u53ef\u4ee5\u80af\u5b9a\u5730\u8bf4，const\u6210\u5458\u51fd\u6570\u90fd\u4f1a\u8fd0\u884c\u5728\u5e76\u53d1\u6267\u884c\u7684\u6761\u4ef6\u4e0b，\u56e0\u6b64\u4f60\u5e94\u8be5\u786e\u4fddconst\u6210\u5458\u51fd\u6570\u5177\u5907\u7ebf\u7a0b\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

                                                      \u76ee\u5f55
                                                      \n\u6761\u6b3e16（\u6210\u5458\u51fd\u6570）：\u4fdd\u8bc1const\u6210\u5458\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168（Make const member functions thread safe）
                                                      \n\u4e92\u65a5\u91cf：\u591a\u4e2a\u53d8\u91cf\/\u5185\u5b58\u4f4d\u7f6e
                                                      \n\u539f\u5b50\u53d8\u91cf：\u5355\u4e2a\u53d8\u91cf\/\u5185\u5b58\u4f4d\u7f6e
                                                      \n\u7efc\u5408\u6bd4\u8f83
                                                      \n\u5c0f\u7ed3 \u6761\u6b3e16（\u6210\u5458\u51fd\u6570）：\u4fdd\u8bc1const\u6210\u5458\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168（Make const member fun<\/p>\n","protected":false},"author":2,"featured_media":90672,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[10326,9830,10325,6223,4591],"topic":[],"class_list":["post-90685","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-const","tag-modern-c","tag-10325","tag-6223","tag-4591"],"yoast_head":"\n\u6761\u6b3e16\uff1a\u4fdd\u8bc1const\u6210\u5458\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/90685.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6761\u6b3e16\uff1a\u4fdd\u8bc1const\u6210\u5458\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168 - 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