types.hh
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	/*
	* Copyright (©) 2018-2023 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 Expolit. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	#ifndef TYPES_HH
	#define TYPES_HH

	#include <cstddef>
	#include <ostream>
	#include <type_traits>
	#include <utility>

	namespace expolit {
	using Int = int;
	using UInt = unsigned int;

	/// Expression class for expression templates
	template <typename Derived>
	struct Expression {
	constexpr const Derived& downcast() const { return static_cast<const Derived&>(*this); }
	constexpr Derived& downcast() { return static_cast<Derived&>(*this); }
	};

	template <typename Derived>
	std::ostream& operator<<(std::ostream& os, const Expression<Derived>& e) {
	os << e.downcast();
	return os;
	}
	} // namespace expolit
	#endif