Explicit inline functions

External member functions
Explicit inline functions

The inline specification can be used explicitly with member functions defined at file scope.
This avoids having to clutter the class definition with function bodies.

struct ch_stack {
   .....
   void reset();
   void push(char c);
   .....
};

inline void ch_stack::reset()
{
   top = EMPTY;
}

inline void ch_stack::push(char c)
{
   assert(top != FULL);
   top++;
   s[top] = c;
}