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field_helpers.hh
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			/**
			* file field_helpers.hh
			*
			* @author Till Junge <till.junge@epfl.ch>
			*
			* @date 30 Aug 2018
			*
			* @brief helper functions that needed to be sequestered to avoid circular
			* inclusions
			*
			* 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 µSpectre; see the file COPYING. If not, write to the
			* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
			* Boston, MA 02111-1307, USA.
			*/

			#ifndef FIELD_HELPERS_H
			#define FIELD_HELPERS_H

			#include <memory>

			namespace muSpectre {

			/**
			* Factory function, guarantees that only fields get created that
			* are properly registered and linked to a collection.
			*/
			template <class FieldType, class FieldCollection, typename... Args>
			inline FieldType &
			make_field(std::string unique_name,
			FieldCollection & collection,
			Args&&... args) {
			std::unique_ptr<FieldType> ptr{
			new FieldType(unique_name, collection, args...)};
			auto& retref{*ptr};
			collection.register_field(std::move(ptr));
			return retref;
			}



			} // muSpectre

			#endif /* FIELD_HELPERS_H */