message.h.svn-base

Probabilistic graphical models in matlab.

#include <vector>
#include <functional>

#include <RandomVariable.h>

#ifndef NDEBUG
#include <iostream>
#endif

//*************** Message Declaration *******************//

class Message {
	
public:
	
	// Constructors
	
	Message ();
	Message (const RandomVariable &, const RandomVariable &);
	Message (const unsigned int, const RandomVariable &);
	
	// Normal methods
	
	void reduce();
	
	void set_index(unsigned int);
	unsigned int get_index() const;
	void set_size(unsigned int);
	
	double get_value(const unsigned int) const;
	double get_value(const RandomVariable &) const;
	void set_value(const RandomVariable & , double);
	
	// Debug methods
	
#ifndef NDEBUG
	void display();
#endif
	
	friend class ExtractFromMessage;
	
private:
	
	unsigned int index;
	std::vector <double> values;	
};

inline void Message::set_index(unsigned int a)
{
	index = a;
}

inline unsigned int Message::get_index() const
{
	return index;
}

inline void Message::set_size(unsigned int a)
{
	values.resize(a);
}

inline double Message::get_value(const unsigned int a) const
{
	return values[a];	
}

inline double Message::get_value(const RandomVariable & rv) const
{
	// For now we only use these messages with Discrete Random Variables
	// But it could be more generic later
	
	const DiscreteRandomVariable & drv = static_cast < const DiscreteRandomVariable & > (rv);
	
	return values[drv.last_sampled_value];
}

inline void Message::set_value(const RandomVariable & rv, double a)
{
	// For now we only use these messages with Discrete Random Variables
	// But it could be more generic later
	
	const DiscreteRandomVariable & drv = static_cast < const DiscreteRandomVariable & > (rv);
	
	values[drv.last_sampled_value] = a;
}

//*************** End of Message Declaration *******************//

//*************** ExtractFromMessage Declaration *******************//

class ExtractFromMessage : public std::unary_function <Message, double>
{
	
public:
		
	double operator ()  (const Message & x) const;
	
	ExtractFromMessage( const unsigned int, const bool = false);
	
	ExtractFromMessage(const RandomVariable &);
	ExtractFromMessage(const RandomVariable &, const RandomVariable &);
	ExtractFromMessage(const RandomVariable &, const unsigned int);
	
private : 
		
	bool forbidden;
	const unsigned int index_of_extraction;
	const unsigned int forbidden_index;
};

//*************** End of ExtractFromMessage Declaration *******************//