static variable inside member function of base class

Question

i have the following:

   class base
   {
      public
       void f();
       ...
   }
    void base::f()
    {
        static bool indicator=false;
         ...         


        

Answer 1

This is precisely the behavior of static variables declared inside function blocks. It has been like that since the introduction of the feature in the C programming language.

The static declaration can also be applied to internal variables. Internal static variables are local to a particular function just as automatic variables are, but unlike automatics, they remain in existence rather than coming and going each time the function is activated. (K&R, page 61).

The static initializer is executed before the first invocation of the containing function. Being static, the variable retains its last state across the invocations.