What is the meaning of having void in the constructor definition?

Question

Given the following code:

#pragma once

class B
{
public:

    B(void)
    {
    }

    ~B(void)
    {
    }
};

I know I can also write this:

Answer 1

afaik if you pass void into the constructor or any function as the argument it means that the function dosnt take any argument so example a and b are equal. but i am not sure if any of them change the function signature in any way or make it run faster etc.