penalty_function_quadratic.hh
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	/**
	* @file penalty_function_quadratic.hh
	*
	* @author Fabio Matti <fabio.matti@epfl.ch>
	*
	* @date creation: Fri Oct 28 2022
	* @date last modification: Fri Oct 28 2022
	*
	* @brief Quadratic 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_QUADRATIC_HH
	#define AKANTU_PENALTY_FUNCTION_QUADRATIC_HH

	template <typename T>
	class PenaltyFunctionQuadratic {
	public:
	T operator()(T var) { return var*var + var; }
	T derivative(T var) { return 2.0*var + 1.0; }
	};

	#endif // AKANTU_PENALTY_FUNCTION_QUADRATIC_HH