system_traits.hh
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	/**
	* @file system_traits.hh
	*
	* @author Till Junge <till.junge@epfl.ch>
	*
	* @date 19 Jan 2018
	*
	* @brief Provides traits for Eigen solvers to be able to use Systems
	*
	* Copyright © 2018 Till Junge
	*
	* µSpectre is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation, either version 3, or (at
	* your option) any later version.
	*
	* µSpectre is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with GNU Emacs; see the file COPYING. If not, write to the
	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	* Boston, MA 02111-1307, USA.
	*/

	#include "common/common.hh"

	#include <Eigen/IterativeLinearSolvers>

	namespace muSpectre {

	template <class System>
	class SystemAdaptor;

	} // muSpectre

	namespace Eigen {
	namespace internal {
	using Dim_t = muSpectre::Dim_t; //!< universal index type
	using Real = muSpectre::Real; //!< universal real value type
	template<class System>
	struct traits<muSpectre::SystemAdaptor<System>> :
	public Eigen::internal::traits<Eigen::SparseMatrix<Real> >
	{};
	} // internal
	} // Eigen