C++ passing function pointer

Question

I have the following function

static void p (){

}

I want to pass a function pointer to p into function x.

void x(void * ptr){

}

I am trying the following, and it is not working.

...
x(ptr);

Note x and p are in different classes. I am getting the following compiling error.

invalid conversion from 'void (*)()' to 'void*' [-fpermissive]

Answer 1

It needs to be:

void x(void(*function)())
{
  // Whatever...
}

If you're using C++11 you can std::function:

void x(std::function<void()> function)
{
  // Whatever
}