What are the access rights for C++ static functions?

The access permissions of static functions are determined by class access permissions and function access permissions. Static functions can access all class members, including private members, but cannot access the this pointer of non-static members. Static functions can be accessed from outside the class even if the class is not visible.

C Access permissions of static functions

Introduction

Static functions are related to Special member functions associated with a class rather than its instances. Static functions have different access rights rules compared to member functions.

Access permissions

Access permissions for static functions are determined by the following factors:

• Class access permissions:static Functions are subordinate to the class to which they belong, and therefore inherit the class's access rights.
• Function access permissions: Static functions themselves can have their own access permissions, such as public, protected, or private .

Rules

• Static functions can access all class members, including private members.
• Static functions cannot access the this pointer of non-static members.
• Static functions can be accessed from outside the class, even if the class is not visible.

Practical Case

Consider the following example:

class MyClass {
public:
    static void printMessage() {
        std::cout << "This is a static function." << std::endl;
    }

private:
    int value;
};

int main() {
    MyClass::printMessage();  // 可从类外部调用

    return 0;
}

In this example:

• printMessage is a static function because it belongs to the MyClass class. The access permission for
• printMessage is public because it is declared as public in the class.
• printMessage can be called in the main function, even if the class is private.

Note

• Static functions cannot use this pointers because they are not associated with a specific instance.
• Static functions can only access data members of the class and cannot access non-static member functions.

The above is the detailed content of What are the access rights for C++ static functions?. For more information, please follow other related articles on the PHP Chinese website!