#include <string.h>
#include <assert.h>
#include <iostream.h>
#include "reactor.h"

reactor::reactor(char* name)
{
   my_name = new char [ strlen(name) + 1 ];   // Allocate memory
   assert( my_name != 0 );
   strcpy(my_name,name);                      // Copy the string

   my_dependents = new reactor* [MAX_DEPENDENTS];
   num_dependents = 0;
}

char* reactor::name()
{
   return my_name;
}

void reactor::add_dependent(reactor* watcher)
{
   if (num_dependents < MAX_DEPENDENTS)
   {
      my_dependents[num_dependents] = watcher;
      num_dependents++;
   }
   else
      cerr << "I already have too many dependents!" << endl;
}

void reactor::change()
{
   cout << my_name << " is changing." << endl;
   for (int i = 0; i < num_dependents; i++)
       my_dependents[i]->update(this);
}

void reactor::update(reactor* sender)
{
   cout << "Uh-oh...  "   << my_name          << " has to change because "
        << sender->name() << " has changed."  << endl;
   change();
}