#ifndef __clerk_h_
#define __clerk_h_
#include "adevs.h"
#include "Customer.h"
#include <list>

/**
 * The Clerk class is derived from the adevs Atomic class.
 * The Clerk's input/output type is specified using the template
 * parameter of the base class.
 */
class Clerk: public adevs::Atomic<IO_Type> 
{
	public:
		/// Constructor.
		Clerk();
		/// Internal transition function.
		void delta_int();
		/// External transition function.
		void delta_ext(double e, const adevs::Bag<IO_Type>& xb);
		/// Confluent transition function.
		void delta_conf(const adevs::Bag<IO_Type>& xb);
		/// Output function.  
		void output_func(adevs::Bag<IO_Type>& yb);
		/// Time advance function.
		double ta();
		/// Output value garbage collection.
		void gc_output(adevs::Bag<IO_Type>& g);
		/// Destructor.
		~Clerk();
		/// Model input port.
		static const int arrive;
		/// Model output port.
		static const int depart;

	private:
		/// The clerk's clock
		double t;
		/// List of waiting customers.
		std::list<Customer*> line;
		/// Time spent so far on the customer at the front of the line
		double t_spent;
};

#endif