exponential.hh
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	/**
	* @file
	*
	* @author Lucas Frérot <lucas.frerot@epfl.ch>
	*
	* @section LICENSE
	*
	* Copyright (©) 2018 EPFL (Ecole Polytechnique Fédérale de
	* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
	* Solides)
	*
	* Expolit 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.
	*
	* Expolit 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 Tamaas. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	#ifndef EXPONENTIAL_HH
	#define EXPONENTIAL_HH

	#include "types.hh"
	#include <cmath>
	#include <ostream>

	namespace expolit {

	template <typename T>
	struct Exponential : public Expression<Exponential<T>> {
	auto operator()(const typename T::value_type& z) const {
	return std::exp(expression(z));
	}

	Exponential(const T& expression) : expression(expression) {}

	const T& expression;
	};

	template <typename T>
	std::ostream& operator<<(std::ostream& os, const Exponential<T>& e) {
	os << "exp(" << e.expression << ")";
	return os;
	}

	} // namespace expolit

	#endif