C++, conflicting between library function and inhertited class function

#include <iostream>
#include <unistd.h>
using namespace std;
class A{
    public:
        bool close(){ return true; }
};
class B: public A{
    public:
        void fun(){
            (void) close(1);
        }
};
int main() {
    B b;
    b.fun();
    return 0;
}

In class B I want to call the function close(1) which is in library unistd.h. FYI: close(int fileDes) used to close the file descriptors in process.

So how to overcome the issue. I got the below error:

source.cpp: In member function 'void B::fun()':
source.cpp:11:27: error: no matching function for call to 'B::close(int)'
   11 |             (void) close(1);
      |                           ^
source.cpp:6:14: note: candidate: 'bool A::close()'
    6 |         bool close(){ return true; }
      |              ^~~~~
source.cpp:6:14: note:   candidate expects 0 arguments, 1 provided

So how to overcome the issue, so that It will call the function in unistd.h file.

In the scope of the member function fun the name close as an unqualified name is searched in the scope of the class

    void fun(){
        (void) close(1);
    }

And indeed there is another member function close in the base class with such a name.

So the compiler selects this function.

If you want to use a function from a namespace then use a qualified name as for example

    void fun(){
        (void) ::close(1);
    }