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penalty_function_linear.hh
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			/**
			* @file penalty_function_linear.hh
			*
			* @author Fabio Matti <fabio.matti@epfl.ch>
			*
			* @date creation: Fri Oct 28 2022
			* @date last modification: Sun Nov 20 2022
			*
			* @brief Linear penalty function
			*
			*
			* @section LICENSE
			*
			* Copyright (©) 2018-2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			*
			* Akantu is free software: you can redistribute it and/or modify it under the
			* terms of the GNU Lesser General Public License as published by the Free
			* Software Foundation, either version 3 of the License, or (at your option) any
			* later version.
			*
			* Akantu 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 Lesser General Public License for more
			* details.
			*
			* You should have received a copy of the GNU Lesser General Public License
			* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
			*
			*/

			#ifndef __AKANTU_PENALTY_FUNCTION_LINEAR_HH__
			#define __AKANTU_PENALTY_FUNCTION_LINEAR_HH__

			/* -------------------------------------------------------------------------- */

			template <typename T> class PenaltyFunctionLinear {
			public:
			T operator()(const T &var) const { return var; }
			T derivative(const T &var) const { return 1.0; }
			};

			#endif /* __AKANTU_PENALTY_FUNCTION_LINEAR_HH__ */