File: vary.hh

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#pragma once

#include "Algorithm.hh"
#include "algorithms/sort_product.hh"

namespace cadabra {

	/// \ingroup algorithms
	///
	/// Generic variational derivative algorithm.

	class vary : public Algorithm {
		public:
			vary(const Kernel&, Ex& tr, Ex& args);

			virtual bool     can_apply(iterator st) override;
			virtual result_t apply(iterator&) override;

		private:
			Ex&        args;

		};

	}