#include <list>
using std::list;

struct RecursiveFunctor;
typedef list<RecursiveFunctor*> ChildCalls;

struct RecursiveFunctor
{
    virtual call(ChildCalls& children) = 0;
    virtual ~RecursiveFunctor(){}
};

struct DistributableStack
{
    virtual void call(RecursiveFunctor* initial) = 0;
    ~DistributableStack(){}
};