descriptor.h
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	#ifndef __DESCRIPTOR_H__
	#define __DESCRIPTOR_H__

	#include <iosfwd>

	class Descriptor
	{

	public:

	// virtual destructor for abtract class
	virtual ~Descriptor() {}

	virtual void update(float) = 0;

	virtual void affiche(std::ostream&) const;
	};

	// ostream forward declaration
	std::ostream& operator<<(std::ostream&, const Descriptor&);

	#endif