Header file out of scope problem

[rozick1]

Ok so my sources are like this:

main.cpp

int main()
{
   widget w;
}

widget.h

#include <"custom header file")
void customfunction (int);
void anotherfunc(int);

widget.cpp

   #include <widget.h>
    void widget::customfunction (int a)
    {
         bigfunc ();  //bigfunc is in custom header file
    }

   void widget:: anotherfunc(int b)
   {
    //do stuff
   }

"custom header file"

void bigfunc ()
{
    anotherfunc (9);
}

Problem is that in the custom header file it says anotherfunc was not declared in this scope.

What (stupid) thing am I doing wrong here?

[Chervil]

"custom header file" should look like this:
void bigfunc ();

The full definition should be in "custom cpp file".

[rozick1]

Even though custom header file just contains my own custom functions (nothing to do with classes)?