相关疑难解决方法(0)

考虑一下代码:

#include <stdio.h>

class Base {
public: 
    virtual void gogo(int a){
        printf(" Base :: gogo (int) \n");
    };

    virtual void gogo(int* a){
        printf(" Base :: gogo (int*) \n");
    };
};

class Derived : public Base{
public:
    virtual void gogo(int* a){
        printf(" Derived :: gogo (int*) \n");
    };
};

int main(){
    Derived obj;
    obj.gogo(7);
}

得到此错误:

>g++ -pedantic -Os test.cpp -o test
test.cpp: In function `int main()':
test.cpp:31: error: no matching function for call to `Derived::gogo(int)'
test.cpp:21: note: candidates are: virtual …

(事先原谅noob问题)

我有4个班:

class Person {};
class Student : public Person {};
class Employee : public Person {};
class StudentEmployee : public Student, public Employee {};

基本上Person是基类,其直接由两个子类Student和Employee.StudentEmployee使用多重继承来子类化Student和Employee.

Person pat = Person("Pat");
Student sam = Student("Sam");
Employee em = Employee("Emily");
StudentEmployee sen = StudentEmployee("Sienna");


Person ppl[3] = {pat, sam, em};
//compile time error: ambiguous base class
//Person ppl[4] = {pat, sam, em, sen}; 

当我使用Person基类的数组时,我可以将Person它的所有子类放在这个数组中.除了StudentEmployee,给出基础模糊的原因. …