{"id":40,"date":"2015-06-04T15:10:40","date_gmt":"2015-06-04T07:10:40","guid":{"rendered":"http:\/\/zsaber.com\/blog\/?p=40"},"modified":"2019-08-26T15:28:34","modified_gmt":"2019-08-26T07:28:34","slug":"c-%e6%a8%a1%e6%8b%9f-super-%e7%9a%84%e9%82%a3%e4%ba%9b%e4%ba%8b","status":"publish","type":"post","link":"http:\/\/zsaber.com\/blog\/p\/40","title":{"rendered":"C++ \u6a21\u62df super \u7684\u90a3\u4e9b\u4e8b"},"content":{"rendered":"

\u64b8\u8fc7 Java \u7684\u5e94\u8be5\u90fd\u77e5\u9053 super \u7684\u597d\u7528, \u5230\u4e86 C++ \u4e16\u754c, \u4e00\u5207\u90fd\u5c4e\u4e86<\/p>\n

\u4e0d\u8fc7 C++ \u662f\u4e2a\u64c5\u957f\u9020\u8f6e\u5b50\u7684\u8bed\u8a00, \u4e8e\u662f, \u4e5f\u6765\u9020\u4e2a super \u7684\u8f6e\u5b50\u5427 (VC \u7684 __super<\/code> \u8fd9\u91cc\u4e0d\u8868)<\/p>\n

\n

\u5f88\u5bb9\u6613\u5c31\u80fd\u60f3\u5230\u7684\u57fa\u7840\u7248\u672c:<\/p>\n

class Base {\npublic:\n    virtual void func(void) {}\n    virtual void func2(void) {}\n};\n\nclass Child : public Base {\nprotected:\n    typedef Base super;\npublic:\n    virtual void func(void) {\n        super::func();\n    }\n};\n\nclass GrandChild : public Child {\nprotected:\n    typedef Child super;\npublic:\n    virtual void func(void) {\n        super::func();\n    }\n    virtual void func2(void) {\n        super::func2();\n    }\n};<\/code><\/pre>\n
\u80fd\u89e3\u51b3\u5927\u591a\u6570\u95ee\u9898\u4e86, \u6ce8\u610f\u8fd9\u91cc\u7684 GrandChild::func2, \u5df2\u7ecf\u80fd\u591f\u81ea\u52a8\u5339\u914d Child \u6216\u8005 Base \u4e2d\u7684\u51fd\u6570\u4e86<\/p>\n
\u8981\u65b9\u4fbf\u4e00\u4e9b\u7684\u8bdd\u53ef\u4ee5\u7528\u5b8f\u6765\u81ea\u52a8\u751f\u6210 typedef<\/p>\n
\u4e0d\u8fc7\u526f\u4f5c\u7528\u5c31\u662f, \u4e07\u4e00\u5176\u4e2d\u4e00\u4e2a\u7236\u7c7b\u5fd8\u8bb0\u4e86 typedef, \u5f88\u53ef\u80fd\u4f1a\u51fa\u73b0\u610f\u5916\u7684\u8c03\u7528\u5173\u7cfb<\/p>\n
\n
\u5927\u591a\u6570\u6559\u7a0b\u6216\u95ee\u7b54\u4e5f\u5c31\u505c\u7559\u4e8e\u6b64\u4e86, \u53ef\u60dc C++ \u662f\u4e2a\u590d\u6742\u7684\u8bed\u8a00, \u8fd8\u6709\u597d\u591a\u60c5\u51b5\u65e0\u6cd5\u7b80\u5355\u7684\u7528 typedef \u89e3\u51b3<\/p>\n
\u7eaf\u865a\u51fd\u6570\u7684\u60c5\u51b5:<\/p>\n
\u8ba9\u6211\u4eec\u5148\u6765\u770b\u770b\u5230\u5e95\u51fa\u4e86\u4ec0\u4e48\u95ee\u9898<\/p>\n
class Base {\n    virtual void func(void) = 0;\n};\n\nclass Child : public Base {\n    virtual void func(void) {\n        super::func(); \/\/ Base::func() \u672a\u5b9a\u4e49\n    }\n};<\/code><\/pre>\n
\u8fd9\u4e2a\u8fd8\u597d\u89e3\u51b3, \u56e0\u4e3a C++ \u5728\u63d0\u4f9b\u4e86\u7eaf\u865a\u51fd\u6570\u7684\u540c\u65f6\u5c45\u7136\u8fd8\u5141\u8bb8\u5b9a\u4e49\u7eaf\u865a\u51fd\u6570, \u4e8e\u662f, \u89e3\u51b3\u65b9\u6cd5\u5927\u7ea6\u662f\u8fd9\u6837:<\/p>\n
class Base {\n    virtual void func(void) = 0;\n};\n\nclass Child : public Base {\n    virtual void func(void) {\n        super::func(); \/\/ \u8fd9\u6b21\u6ca1\u6709\u95ee\u9898\u4e86\n    }\n};\n\/\/ \u5728\u67d0\u4e2a cpp \u6587\u4ef6\u4e2d\nvoid Base::func(void) {} \/\/ \u6b64\u5904\u63d0\u4f9b\u5b9a\u4e49<\/code><\/pre>\n
\u55ef\u55ef, C++ \u603b\u662f\u80fd\u51fa\u5176\u4e0d\u610f\u7684\u51fa\u73b0\u4e00\u4e9b\u5947\u8469\u7684\u8bed\u6cd5\u548c\u903b\u8f91 (- -#)<\/p>\n
\u6b64\u5916, \u636e\u8bf4\u8fd8\u6709\u79cd\u66f4\u52a0\u5947\u8469\u7684\u5199\u6cd5: (\u672a\u8003\u8bc1)<\/p>\n
class Base {\n    virtual void func(void) = 0\n    {\n    }\n};<\/code><\/pre>\n
\n
\u591a\u7ee7\u627f\u7684\u60c5\u51b5:<\/p>\n
class Base {\n};\n\nclass BaseInterface {\n    virtual void func(void) {}\n};\n\nclass Child : public Base, public BaseInterface {\n    typedef Base super;\n    virtual void func(void) {\n        \/\/ super::func(); \/\/ \u9519\u8bef, Base \u6ca1\u6709 func\n        BaseInterface::func(); \/\/ \u6b63\u786e, \u4f46\u662f\u7528\u4e0d\u4e86 super \u4e86\n    }\n};\n\nclass GrandChild : public Child {\n    typedef Child super;\n    virtual void func(void) {\n        super::func(); \/\/ \u6b63\u786e, \u8fd9\u91cc\u53c8\u53ef\u4ee5\u5f88\u9177\u7684\u7528 super \u4e86\n    }\n};<\/code><\/pre>\n
(PS: \u4e3a\u4ec0\u4e48\u4f1a\u5b58\u5728 Interface \u8bbe\u8ba1\u5374\u63d0\u4f9b\u51fd\u6570\u4f53\u5462? \u56e0\u4e3a\u53ef\u4ee5\u7b80\u5355\u7c97\u66b4\u7684\u5b9e\u73b0 "\u53ef\u9009" \u63a5\u53e3\u7684\u529f\u80fd)<\/p>\n
\u9664\u4e86\u4e0d\u80fd\u6109\u5feb\u7684\u4f7f\u7528 super \u5916, \u591a\u7ee7\u627f\u7684\u60c5\u666f\u5bf9\u4e8e GrandChild \u8fd9\u79cd\u60c5\u51b5\u4e5f\u6bd4\u8f83\u7e41\u7410<\/p>\n
BaseInterface \u7684\u76f4\u63a5\u5b50\u7c7b\u53ea\u80fd\u7528 BaseInterface:: \u8fdb\u884c\u8c03\u7528, \u7136\u800c\u4e8c\u7ea7\u5b50\u7c7b\u5374\u8981\u660e\u786e\u7684\u6307\u5b9a Child:: (\u6216\u6587\u4e2d\u7684 super::) \u8fdb\u884c\u8c03\u7528, \u5f53\u7ee7\u627f\u5173\u7cfb\u53d8\u5316\u7684\u65f6\u5019\u8fd9\u4e9b\u5185\u5bb9\u5c31\u5f97\u5168\u90e8\u91cd\u65b0\u4fee\u6539<\/p>\n
\u867d\u7136\u8fd9\u91cc\u4e0d\u80fd\u6109\u5feb\u7684\u4f7f\u7528 super \u4e86, \u4e0d\u8fc7\u8fd8\u662f\u6709\u4e00\u4e2a\u53d8\u901a\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0, \u53ef\u4ee5\u4e0d\u7528\u5173\u5fc3\u662f\u5426\u662f\u4e8c\u7ea7\u5b50\u7c7b:<\/p>\n
\u9996\u5148\u4f60\u5f97\u6709\u4e2a\u80fd\u591f\u5728\u7f16\u8bd1\u671f\u5224\u65ad\u67d0\u4e2a\u7c7b\u578b\u662f\u5426\u662f\u53e6\u4e00\u4e2a\u7c7b\u578b\u7684\u5b50\u7c7b\u7684\u4e1c\u897f, \u5f62\u5982<\/p>\n
bool check = class_is_type_of(MyClass, TypeToCheck);<\/code><\/pre>\n
\u8fd9\u90e8\u5206\u672c\u6587\u4e0d\u8868, \u8bf7\u81ea\u884c\u641c\u7d22<\/p>\n
\u7136\u540e, \u5b9a\u4e49\u4e00\u4e2a\u6a21\u677f\u6765\u6839\u636e\u7ee7\u627f\u5173\u7cfb\u5224\u65ad\u6700\u7ec8\u6240\u9700\u7684\u7c7b\u578b:<\/p>\n
template<typename T_super, typename T_superInterface, int superAlsoImplInterface>\nclass _superT {\npublic:\n    typedef T_superInterface SuperType;\n};\n\ntemplate<typename T_super, typename T_superInterface>\nclass _superT<T_super, T_superInterface, 1> {\npublic:\n    typedef T_super SuperType;\n};\n\n#define superT(T_superInterface) \\\n    _superT<super, T_superInterface, class_is_type_of(super, T_superInterface)>::SuperType<\/code><\/pre>\n
\u6700\u540e, \u7528\u8d77\u6765\u7684\u6548\u679c\u5dee\u4e0d\u591a\u662f\u8fd9\u6837:<\/p>\n
class Base {\n};\n\nclass BaseInterface {\n    virtual void func(void) {}\n    virtual void func2(void) {}\n};\n\nclass Child : public Base, public BaseInterface {\n    typedef Base super;\n    virtual void func(void) {\n        superT(BaseInterface)::func(); \/\/ \u6b63\u786e, \u8c03\u7528 BaseInterface::func\n    }\n};\n\nclass GrandChild : public Child {\n    typedef Child super;\n    virtual void func(void) {\n        superT(BaseInterface)::func(); \/\/ \u6b63\u786e, \u8c03\u7528 Child::func\n    }\n    virtual void func2(void) {\n        superT(BaseInterface)::func2(); \/\/ \u6b63\u786e, \u8c03\u7528 BaseInterface::func2\n    }\n};<\/code><\/pre>\n
\u4e0d\u8fc7\u8fd9\u79cd\u60c5\u51b5\u6bd4\u8f83\u5c11\u51fa\u73b0, \u800c\u4e14\u4ec5\u9002\u7528\u4e8e\u5355\u6839\u7ee7\u627f+interface\u4f53\u7cfb<\/p>\n","protected":false},"excerpt":{"rendered":"
\u64b8\u8fc7 Java \u7684\u5e94\u8be5\u90fd\u77e5\u9053 super \u7684\u597d\u7528, \u5230\u4e86 C++ \u4e16\u754c, \u4e00\u5207\u90fd\u5c4e\u4e86 \u4e0d\u8fc7 C++ \u662f\u4e2a\u64c5\u957f\u9020\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"yoast_head":"\nC++ \u6a21\u62df super \u7684\u90a3\u4e9b\u4e8b - \u67d0Z\u7684\u535a\u5ba2<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/zsaber.com\/blog\/p\/40\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++ \u6a21\u62df super \u7684\u90a3\u4e9b\u4e8b - \u67d0Z\u7684\u535a\u5ba2\" \/>\n<meta property=\"og:description\" content=\"\u64b8\u8fc7 Java \u7684\u5e94\u8be5\u90fd\u77e5\u9053 super \u7684\u597d\u7528, \u5230\u4e86 C++ \u4e16\u754c, \u4e00\u5207\u90fd\u5c4e\u4e86 \u4e0d\u8fc7 C++ \u662f\u4e2a\u64c5\u957f\u9020\u2026 Read More »\" \/>\n<meta property=\"og:url\" content=\"http:\/\/zsaber.com\/blog\/p\/40\" \/>\n<meta property=\"og:site_name\" content=\"\u67d0Z\u7684\u535a\u5ba2\" \/>\n<meta property=\"article:published_time\" content=\"2015-06-04T07:10:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-08-26T07:28:34+00:00\" \/>\n<meta name=\"author\" content=\"Z\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"Z\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"http:\/\/zsaber.com\/blog\/p\/40#article\",\"isPartOf\":{\"@id\":\"http:\/\/zsaber.com\/blog\/p\/40\"},\"author\":{\"name\":\"Z\",\"@id\":\"http:\/\/zsaber.com\/blog\/#\/schema\/person\/6a6701fc719eff087e24e39a00e2280f\"},\"headline\":\"C++ \u6a21\u62df super \u7684\u90a3\u4e9b\u4e8b\",\"datePublished\":\"2015-06-04T07:10:40+00:00\",\"dateModified\":\"2019-08-26T07:28:34+00:00\",\"mainEntityOfPage\":{\"@id\":\"http:\/\/zsaber.com\/blog\/p\/40\"},\"wordCount\":32,\"commentCount\":0,\"publisher\":{\"@id\":\"http:\/\/zsaber.com\/blog\/#\/schema\/person\/6a6701fc719eff087e24e39a00e2280f\"},\"articleSection\":[\"C++\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"http:\/\/zsaber.com\/blog\/p\/40#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"http:\/\/zsaber.com\/blog\/p\/40\",\"url\":\"http:\/\/zsaber.com\/blog\/p\/40\",\"name\":\"C++ \u6a21\u62df super \u7684\u90a3\u4e9b\u4e8b - 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