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Calling class method through NULL class pointer in C++
A class method can be can be called using a NULL class pointer.
Note − This is undefined behaviour and there is not guarantee about the execution of the program. The actual results depend on the compiler used.
A program that demonstrates this is given as follows.
Example
#include <iostream>
using namespace std;
class Example {
public :
void func() {
cout << "The function is called through Null class pointer.";
}
};
int main() {
Example *p = NULL;
p->func();
return 0;
}Output
The output of the above program is as follows.
The function is called through Null class pointer.
Now, let us understand the above program.
The class Example contains a member function func(). This function displays "The function is called through Null class pointer." The code snippet for this is given as follows.
class Example {
public :
void func() {
cout << "The function is called through Null class pointer.";
}
};In the function main(), the class null pointer p is created. Then func() is called using p. The code snippet for this is given as follows.
int main() {
Example *p = NULL;
p->func();
return 0;
}
Updated on: 26-Jun-2020
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