T2542

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