Can C++ static functions access non-static member functions?

In C, static functions cannot directly access non-static member functions. Solutions include: 1. Access through object pointers; 2. Access through class scope operators.

Static function in C accesses non-static member function

In C, static function is a special member function. It is not associated with any specific object in the class. This means that static functions cannot directly access non-static member functions (i.e. ordinary member functions).

However, this limitation can be solved in the following two ways:

1. Access through object pointer:

Create an object pointing to the current class pointer, and then use the pointer to access the non-static member function. For example:

class MyClass {
public:
    static void staticFunction() {
        MyClass* obj = new MyClass();
        obj->nonStaticFunction();
        delete obj;
    }

    void nonStaticFunction() {
        // ...
    }
};

2. Access through class scope:

If the non-static member function is public, you can access it through class scope operator (::) for access. For example:

class MyClass {
public:
    static void staticFunction() {
        MyClass::nonStaticFunction();
    }

    static void nonStaticFunction() {
        // ...
    }
};

Practical case:

Suppose we have a Student class, which contains a member function getGrade() and a static function printGrade(). printGrade() Requires access to getGrade() to print student grades.

class Student {
public:
    int grade;

    void getGrade() {
        // 获取学生的成绩
    }

    static void printGrade(Student* student) {
        student->getGrade();
        // 通过对象指针访问非静态成员函数
    }

    static void printGrade() {
        Student student;
        student.getGrade();
        // 通过类作用域访问非静态成员函数
    }
};

In this case, printGrade() can be accessed both through the object pointer and getGrade() through the class scope.

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