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

symkit_prog/symath/descriptor.h9ad6607cfc74master