1\u3001\u7c7b\u5b9a\u4e49\u4e86\u4e00\u4e2a\u65b0\u7684\u7c7b\u578b\u548c\u4e00\u4e2a\u65b0\u7684\u4f5c\u7528\u57df\u3002<\/p>\n
\u6bcf\u4e2a\u7c7b\u53ef\u4ee5\u6ca1\u6709\u6210\u5458\uff0c\u4e5f\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a\u6210\u5458\uff0c\u6210\u5458\u53ef\u4ee5\u662f\u6570\u636e\u3001\u51fd\u6570\u6216\u7c7b\u578b\u522b\u540d<\/strong>\u3002<\/p>\n 2\u3001\u5728\u7c7b\u5185\u90e8\u5b9a\u4e49\u7684\u51fd\u6570\u9ed8\u8ba4\u4e3ainline\u3002\u50cf\u5176\u4ed6inline\u4e00\u6837\uff0cinline\u6210\u5458\u51fd\u6570\u7684\u5b9a\u4e49\u5fc5\u987b\u5728\u8c03\u7528\u8be5\u51fd\u6570\u7684\u6bcf\u4e2a\u6e90\u6587\u4ef6\u4e2d\u662f\u53ef\u89c1\u7684\u3002\u4e0d\u5728\u7c7b\u5b9a\u4e49\u4f53\u5185\u5b9a\u4e49\u7684inline\u6210\u5458\u51fd\u6570\uff0c\u5176\u5b9a\u4e49\u901a\u5e38\u5e94\u653e\u5728\u6709\u7c7b\u5b9a\u4e49\u7684\u540c\u4e00\u5934\u6587\u4ef6\u4e2d\u3002<\/p>\n 3\u3001\u5c06\u5173\u952e\u5b57const\u52a0\u5728\u5f62\u53c2\u5217\u8868\u4e4b\u540e\uff0c\u5c31\u53ef\u4ee5\u5c06\u6210\u5458\u51fd\u6570\u58f0\u660e\u4e3a\u5e38\u91cf\uff1a<\/p>\n double avg_price() const;<\/p>\n const\u6210\u5458\u4e0d\u80fd\u6539\u53d8\u5176\u6240\u64cd\u4f5c\u7684\u5bf9\u8c61\u7684\u6570\u636e\u6210\u5458\u3002const\u5fc5\u987b\u540c\u65f6\u51fa\u73b0\u5728\u58f0\u660e\u548c\u5b9a\u4e49\u4e2d\uff0c\u82e5\u53ea\u51fa\u73b0\u5728\u5176\u4e2d\u4e00\u5904\uff0c\u5c31\u4f1a\u51fa\u73b0\u4e00\u4e2a\u7f16\u8bd1\u65f6\u9519\u8bef\u3002<\/p>\n 4\u3001\u4e00\u4e2a\u8bbf\u95ee\u6807\u53f7\uff08private\u3001protected\u3001public\uff09\u53ef\u4ee5\u51fa\u73b0\u7684\u6b21\u6570\u901a\u5e38\u662f\u6ca1\u6709\u9650\u5236\u7684\u3002\u6bcf\u4e2a\u8bbf\u95ee\u6807\u53f7\u6307\u5b9a\u4e86\u968f\u540e\u7684\u6210\u5458\u5b9a\u4e49\u7684\u8bbf\u95ee\u7ea7\u522b\u3002\u8fd9\u4e2a\u6307\u5b9a\u7684\u8bbf\u95ee\u7ea7\u522b\u6301\u7eed\u6709\u6548\uff0c\u76f4\u81f3\u9047\u5230\u4e0b\u4e00\u4e2a\u8bbf\u95ee\u6807\u53f7\u6216\u770b\u5230\u7c7b\u5b9a\u4e49\u4f53\u7684\u53f3\u82b1\u62ec\u53f7\u4e3a\u6b62\u3002<\/p>\n 5\u3001\u9664\u4e86\u5b9a\u4e49\u6570\u636e\u548c\u51fd\u6570\u6210\u5458\u4e4b\u5916\uff0c\u7c7b\u8fd8\u53ef\u4ee5\u5b9a\u4e49\u81ea\u5df1\u7684\u5c40\u90e8\u7c7b\u578b\u540d\u5b57\u3002<\/p>\n class Screen {<\/p>\n public:<\/p>\n \u00a0\u00a0\u00a0 typedef std::string::size_type index;<\/p>\n private:<\/p>\n \u00a0\u00a0\u00a0 index cursor;<\/p>\n };<\/p>\n 6\u3001\u5728\u58f0\u660e\u4e4b\u540e\u3001\u5b9a\u4e49\u4e4b\u524d\uff0c\u7c7b\u7c7b\u578b\u662f\u4e00\u4e2a\u4e0d\u5b8c\u5168\u7c7b\u578b\uff0c\u5373\u5df2\u77e5\u662f\u7c7b\u7c7b\u578b\uff0c\u4f46\u4e0d\u77e5\u9053\u5305\u542b\u54ea\u4e9b\u6210\u5458\u3002<\/p>\n \u4e0d\u5b8c\u5168\u7c7b\u578b\u53ea\u80fd\u4ee5\u6709\u9650\u65b9\u5f0f\u4f7f\u7528\u3002\u4e0d\u80fd\u5b9a\u4e49\u8be5\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u4e0d\u5b8c\u5168\u7c7b\u578b\u53ea\u80fd\u7528\u4e8e\u5b9a\u4e49\u6307\u5411\u8be5\u7c7b\u578b\u7684\u6307\u9488\u53ca\u5f15\u7528\uff0c\u6216\u8005\u7528\u4e8e\u58f0\u660e\uff08\u800c\u4e0d\u662f\u5b9a\u4e49\uff09\u4f7f\u7528\u8be5\u7c7b\u578b\u4f5c\u4e3a\u5f62\u53c2\u7c7b\u578b\u6216\u8fd4\u56de\u7c7b\u578b\u7684\u51fd\u6570\u3002<\/p>\n 7\u3001\u4e0d\u80fd\u4ececonst\u6210\u5458\u51fd\u6570\u8fd4\u56de\u6307\u5411\u7c7b\u5bf9\u8c61\u7684\u666e\u901a\u5f15\u7528\uff08\u53ea\u80fd\u8fd4\u56deconst\u5f15\u7528\uff09\u3002const\u6210\u5458\u51fd\u6570\u53ea\u80fd\u8fd4\u56de*this\u4f5c\u4e3a\u4e00\u4e2aconst\u5f15\u7528\u3002<\/p>\n \u57fa\u4e8e\u6210\u5458\u51fd\u6570\u662f\u5426\u4e3aconst\uff0c\u53ef\u4ee5\u91cd\u8f7d\u4e00\u4e2a\u6210\u5458\u51fd\u6570\uff1b\u540c\u6837\u5730\uff0c\u57fa\u4e8e\u4e00\u4e2a\u6307\u9488\u5f62\u53c2\u662f\u5426\u6307\u5411const\uff0c\u53ef\u4ee5\u91cd\u8f7d\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n 8\u3001\u7c7b\u7684\u6570\u636e\u6210\u5458\u58f0\u660e\u4e3amutable\u5373\u53ef\u5728\u4efb\u4f55\u6210\u5458\u51fd\u6570\u5185\uff08\u751a\u81f3\u5728const\u6210\u5458\u51fd\u6570\u5185\uff09\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n \u53ef\u53d8\u6570\u636e\u6210\u5458\u6c38\u8fdc\u90fd\u4e0d\u80fd\u4e3aconst\uff0c\u751a\u81f3\u5f53\u5b83\u662fconst\u5bf9\u8c61\u7684\u6210\u5458\u65f6\u4e5f\u5982\u6b64\u3002\u56e0\u6b64\uff0cconst\u6210\u5458\u51fd\u6570\u53ef\u4ee5\u6539\u53d8mutable\u6210\u5458\u3002\u8981\u5c06\u6570\u636e\u6210\u5458\u58f0\u660e\u4e3a\u53ef\u53d8\u7684\uff0c\u5fc5\u987b\u5c06\u5173\u952e\u5b57mutable\u653e\u5728\u6210\u5458\u58f0\u660e\u4e4b\u524d\uff1amutable size_t access_ctr;<\/p>\n 9\u3001\u5b8c\u5168\u9650\u5b9a\u540d\u4e4b\u540e\u7684\u7c7b\u6210\u5458\u51fd\u6570\u5b9a\u4e49\u3001\u5f62\u53c2\u8868\u548c\u51fd\u6570\u4f53\u90fd\u5904\u4e8e\u7c7b\u4f5c\u7528\u57df\u4e2d\u3002<\/p>\n \u5728\u5b9a\u4e49\u4e8e\u7c7b\u5916\u90e8\u7684\u6210\u5458\u51fd\u6570\u4e2d\uff0c\u5f62\u53c2\u8868\u548c\u6210\u5458\u51fd\u6570\u4f53\u90fd\u51fa\u73b0\u5728\u6210\u5458\u540d\u4e4b\u540e\u3002\u8fd9\u4e9b\u90fd\u662f\u5728\u7c7b\u4f5c\u7528\u57df\u4e2d\u5b9a\u4e49\uff0c\u6240\u4ee5\u53ef\u4ee5\u4e0d\u7528\u9650\u5b9a\u800c\u5f15\u7528\u5176\u4ed6\u6210\u5458\u3002<\/p>\n \u4e0e\u5f62\u53c2\u7c7b\u578b\u76f8\u6bd4\uff0c\u8fd4\u56de\u7c7b\u578b\u51fa\u73b0\u5728\u6210\u5458\u540d\u5b57\u524d\u9762\u3002\u5982\u679c\u51fd\u6570\u5728\u7c7b\u5b9a\u4e49\u4f53\u4e4b\u5916\u5b9a\u4e49\uff0c\u5219\u7528\u4e8e\u8fd4\u56de\u7c7b\u578b\u7684\u540d\u5b57\u5728\u7c7b\u4f5c\u7528\u57df\u4e4b\u5916\u3002\u5982\u679c\u8fd4\u56de\u7c7b\u578b\u4f7f\u7528\u7531\u7c7b\u5b9a\u4e49\u7684\u7c7b\u578b\uff0c\u5219\u5fc5\u987b\u4f7f\u7528\u5b8c\u5168\u9650\u5b9a\u540d\u3002<\/p>\n 10\u3001\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u5f0f\u53ea\u5728\u6784\u9020\u51fd\u6570\u7684\u5b9a\u4e49\u4e2d\u800c\u4e0d\u662f\u58f0\u660e\u4e2d\u6307\u5b9a\u3002\u4e0d\u7ba1\u6210\u5458\u662f\u5426\u5728\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u5217\u8868\u4e2d\u663e\u793a\u521d\u59cb\u5316\uff0c\u7c7b\u7c7b\u578b\u7684\u6570\u636e\u6210\u5458\u603b\u662f\u5728\u521d\u59cb\u5316\u9636\u6bb5\u521d\u59cb\u5316\u3002\u521d\u59cb\u5316\u53d1\u751f\u5728\u8ba1\u7b97\u9636\u6bb5\u5f00\u59cb\u4e4b\u524d\u3002<\/p>\n \u6709\u4e9b\u6210\u5458\u5fc5\u987b\u5728\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u5217\u8868\u4e2d\u8fdb\u884c\u521d\u59cb\u5316\u3002\u5bf9\u4e8e\u8fd9\u6837\u7684\u6210\u5458\uff0c\u5728\u6784\u9020\u51fd\u6570\u4f53\u4e2d\u5bf9\u5b83\u4eec\u8d4b\u503c\u4e0d\u8d77\u4f5c\u7528\u3002\u6ca1\u6709\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u7684\u7c7b\u7c7b\u578b\u7684\u6210\u5458\uff0c\u4ee5\u53caconst\u6216\u5f15\u7528\u7c7b\u578b\u7684\u6210\u5458\uff0c\u4e0d\u7ba1\u662f\u54ea\u79cd\u7c7b\u578b\uff0c\u90fd\u5fc5\u987b\u5728\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u5217\u8868\u4e2d\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n \u8bb0\u4f4f\uff0c\u53ef\u4ee5\u521d\u59cb\u5316const\u5bf9\u8c61\u6216\u5f15\u7528\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u4f46\u4e0d\u80fd\u5bf9\u5b83\u4eec\u8d4b\u503c\u3002\u521d\u59cb\u5316const\u6216\u5f15\u7528\u7c7b\u578b\u6570\u636e\u6210\u5458\u7684\u552f\u4e00\u673a\u4f1a\u662f\u5728\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u5217\u8868\u4e2d\u3002<\/p>\n \u5fc5\u987b\u5bf9\u4efb\u4f55const\u6216\u5f15\u7528\u7c7b\u578b\u6210\u5458\u4ee5\u53ca\u6ca1\u6709\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u7684\u7c7b\u7c7b\u578b\u7684\u4efb\u4f55\u6210\u5458\u4f7f\u7528\u521d\u59cb\u5316\u5f0f\u3002<\/p>\n 11\u3001\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u5217\u8868\u4ec5\u6307\u5b9a\u7528\u4e8e\u521d\u59cb\u5316\u6210\u5458\u7684\u503c\uff0c\u5e76\u4e0d\u6307\u5b9a\u8fd9\u4e9b\u521d\u59cb\u5316\u6267\u884c\u7684\u6b21\u5e8f\u3002\u6210\u5458\u88ab\u521d\u59cb\u5316\u7684\u6b21\u5e8f\u5c31\u662f\u5b9a\u4e49\u6210\u5458\u7684\u6b21\u5e8f\u3002\u7b2c\u4e00\u4e2a\u6210\u5458\u9996\u5148\u88ab\u521d\u59cb\u5316\uff0c\u7136\u540e\u662f\u7b2c\u4e8c\u4e2a\uff0c\u4f9d\u6b21\u7c7b\u63a8\u3002<\/p>\n 12\u3001\u53ef\u4ee5\u7528\u5355\u4e2a\u5b9e\u53c2\u6765\u8c03\u7528\u7684\u6784\u9020\u51fd\u6570\u5b9a\u4e49\u4e86\u4ece\u5f62\u53c2\u7c7b\u578b\u5230\u8be5\u7c7b\u7c7b\u578b\u7684\u4e00\u4e2a\u9690\u5f0f\u8f6c\u6362\u3002<\/p>\n \u901a\u5e38\uff0c\u9664\u975e\u6709\u660e\u663e\u7684\u7406\u7531\u60f3\u8981\u5b9a\u4e49\u9690\u5f0f\u8f6c\u6362\uff0c\u5426\u5219\uff0c\u5355\u5f62\u53c2\u6784\u9020\u51fd\u6570\u5e94\u8be5\u4e3aexplicit\u3002\u5c06\u6784\u9020\u51fd\u6570\u8bbe\u7f6e\u4e3aexplicit\u53ef\u4ee5\u907f\u514d\u9519\u8bef\uff0c\u5e76\u4e14\u5f53\u8f6c\u6362\u6709\u7528\u65f6\uff0c\u7528\u6237\u53ef\u4ee5\u663e\u5f0f\u5730\u6784\u9020\u5bf9\u8c61\u3002explicit\u5173\u952e\u5b57\u53ea\u80fd\u7528\u4e8e\u7c7b\u5185\u90e8\u7684\u6784\u9020\u51fd\u6570\u58f0\u660e\u4e0a\u3002<\/p>\n 13\u3001\u53cb\u5143\u58f0\u660e\u53ef\u4ee5\u51fa\u73b0\u5728\u7c7b\u4e2d\u7684\u4efb\u4f55\u5730\u65b9\uff1a\u53cb\u5143\u4e0d\u662f\u6388\u4e88\u53cb\u5143\u5173\u7cfb\u7684\u90a3\u4e2a\u7c7b\u7684\u6210\u5458\uff0c\u6240\u4ee5\u5b83\u4eec\u4e0d\u53d7\u5176\u58f0\u660e\u51fa\u73b0\u90e8\u5206\u7684\u8bbf\u95ee\u63a7\u5236\u5f71\u54cd\u3002<\/p>\n \u53cb\u5143\u53ef\u4ee5\u662f\u666e\u901a\u7684\u975e\u6210\u5458\u51fd\u6570\uff0c\u6216\u524d\u9762\u5b9a\u4e49\u7684\u5176\u4ed6\u7c7b\u7684\u6210\u5458\u51fd\u6570\uff0c\u6216\u6574\u4e2a\u7c7b\u3002\u5c06\u4e00\u4e2a\u7c7b\u8bbe\u4e3a\u53cb\u5143\uff0c\u53cb\u5143\u7c7b\u7684\u6240\u6709\u6210\u5458\u51fd\u6570\u90fd\u53ef\u4ee5\u8bbf\u95ee\u6388\u4e88\u53cb\u5143\u5173\u7cfb\u7684\u90a3\u4e2a\u7c7b\u7684\u975e\u516c\u6709\u6210\u5458\u3002<\/p>\n \u53cb\u5143\u7c7b\uff0c\u5fc5\u987b\u5148\u5b9a\u4e49\u8be5\u7c7b\u3002\u53cb\u5143\u51fd\u6570\uff0c\u5fc5\u987b\u5148\u5b9a\u4e49\u6388\u4e88\u53cb\u5143\u5173\u7cfb\u7684\u7c7b\u3002<\/p>\n 14\u3001\u56e0\u4e3astatic\u6210\u5458\u4e0d\u662f\u4efb\u4f55\u5bf9\u8c61\u7684\u7ec4\u6210\u90e8\u5206\uff0c\u6240\u4ee5static\u6210\u5458\u51fd\u6570\u4e0d\u80fd\u88ab\u58f0\u660e\u4e3aconst\u3002\u6bd5\u7adf\uff0c\u5c06\u6210\u5458\u51fd\u6570\u58f0\u660e\u4e3aconst\u5c31\u662f\u627f\u8bfa\u4e0d\u4f1a\u4fee\u6539\u8be5\u51fd\u6570\u6240\u5c5e\u7684\u5bf9\u8c61\u3002\u6700\u540e\uff0cstatic\u6210\u5458\u51fd\u6570\u4e5f\u4e0d\u80fd\u88ab\u58f0\u660e\u4e3a\u865a\u51fd\u6570\u3002<\/p>\n static\u6570\u636e\u6210\u5458\u5fc5\u987b\u5728\u7c7b\u5b9a\u4e49\u4f53\u7684\u5916\u90e8\u5b9a\u4e49\uff08\u6b63\u597d\u4e00\u6b21\uff09\u3002<\/p>\n \u4e0d\u50cf\u666e\u901a\u6570\u636e\u6210\u5458\uff0cstatic\u6210\u5458\u4e0d\u662f\u901a\u8fc7\u7c7b\u6784\u9020\u51fd\u6570\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u800c\u662f\u5e94\u8be5\u5728\u5b9a\u4e49\u65f6\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n \u4fdd\u8bc1\u5bf9\u8c61\u6b63\u597d\u5b9a\u4e49\u4e00\u6b21\u7684\u6700\u597d\u529e\u6cd5\uff0c\u5c31\u662f\u5c06static\u6570\u636e\u6210\u5458\u7684\u5b9a\u4e49\u653e\u5728\u5305\u542b\u7c7b\u7684\u975e\u5185\u8054\u6210\u5458\u51fd\u6570\u5b9a\u4e49\u7684\u6587\u4ef6\u4e2d\u3002<\/p>\n const static\u6570\u636e\u6210\u5458\u5728\u7c7b\u7684\u5b9a\u4e49\u4f53\u4e2d\u521d\u59cb\u5316\u65f6\uff0c\u8be5\u6570\u636e\u6210\u5458\u4ecd\u5fc5\u987b\u5728\u7c7b\u7684\u5b9a\u4e49\u4f53\u5728\u5916\u8fdb\u884c\u5b9a\u4e49\u3002\u5728\u7c7b\u5185\u90e8\u63d0\u4f9b\u521d\u59cb\u5316\u5f0f\u65f6\uff0c\u6210\u5458\u7684\u5b9a\u4e49\u4e0d\u5fc5\u518d\u6307\u5b9a\u521d\u59cb\u503c\u3002<\/p>\n static\u6570\u636e\u6210\u5458\u7684\u7c7b\u578b\u53ef\u4ee5\u662f\u8be5\u6210\u5458\u6240\u5c5e\u7684\u7c7b\u7c7b\u578b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":" 1\u3001\u7c7b\u5b9a\u4e49\u4e86\u4e00\u4e2a\u65b0\u7684\u7c7b\u578b\u548c\u4e00\u4e2a\u65b0\u7684\u4f5c\u7528\u57df\u3002 \u6bcf\u4e2a\u7c7b\u53ef\u4ee5\u6ca1\u6709\u6210\u5458\uff0c\u4e5f\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a\u6210\u5458\uff0c\u6210\u5458\u53ef\u4ee5\u662f\u6570\u636e\u3001\u51fd\u6570\u6216\u7c7b\u578b […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-442","post","type-post","status-publish","format-standard","hentry","category-cplusplusprimer"],"_links":{"self":[{"href":"http:\/\/115.29.108.60\/index.php?rest_route=\/wp\/v2\/posts\/442","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/115.29.108.60\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/115.29.108.60\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/115.29.108.60\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/115.29.108.60\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=442"}],"version-history":[{"count":3,"href":"http:\/\/115.29.108.60\/index.php?rest_route=\/wp\/v2\/posts\/442\/revisions"}],"predecessor-version":[{"id":551,"href":"http:\/\/115.29.108.60\/index.php?rest_route=\/wp\/v2\/posts\/442\/revisions\/551"}],"wp:attachment":[{"href":"http:\/\/115.29.108.60\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/115.29.108.60\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=442"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/115.29.108.60\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}