入下面所示：类C同时继承了A和B,并且两个都定义了相同的函数,如果这时候编译的话会得到错误.
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| testhir.cpp: In function ‘int main(int, const char**)’: testhir.cpp:26:7: error: request for member ‘printR’ is ambiguous c.printR(); ^~~~~~ testhir.cpp:5:14: note: candidates are: void A::printR() void printR() ^~~~~~ testhir.cpp:13:14: note: void B::printR() void printR() ^~~~~~
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| #include <iostream> class A { public: void printR() { std::cout << "in A" << std::endl; } }; class B { public: void printR() std::cout << "in B" << std::endl; } }; class C :B,A { public: }; int main(int argc, const char** argv) { C c; c.printR(); return 0; }
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如果在C中也实现了相同的函数的话,就可以正常编译获得结果:in C
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| #include <iostream> class A { public: void printR() { std::cout << "in A" << std::endl; } }; class B { public: void printR() { std::cout << "in B" << std::endl; } }; class C :B,A { public: void printR() { std::cout << "in C" << std::endl; } }; int main(int argc, const char** argv) { C c; c.printR(); return 0; }
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呼呼呼山(http://code4fun.me)
2019-05-24 15:40:15