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mpi_interface.cpp
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			/*
			* SPDX-License-Indentifier: AGPL-3.0-or-later
			*
			* Copyright (©) 2016-2022 EPFL (École Polytechnique Fédérale de Lausanne),
			* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			*
			* This program is free software: you can redistribute it and/or modify
			* it under the terms of the GNU Affero General Public License as published
			* by the Free Software Foundation, either version 3 of the License, or
			* (at your option) any later version.
			*
			* This program 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 Affero General Public License for more details.
			*
			* You should have received a copy of the GNU Affero General Public License
			* along with this program. If not, see <https://www.gnu.org/licenses/>.
			*
			*/
			/* -------------------------------------------------------------------------- */
			#include "mpi_interface.hh"
			/* -------------------------------------------------------------------------- */
			namespace tamaas {

			namespace mpi_dummy {
			comm comm::world;
			}

			#ifdef TAMAAS_USE_MPI
			namespace mpi_impl {
			comm& comm::world() {
			static comm _world{MPI_COMM_WORLD};
			return _world;
			}
			} // namespace mpi_impl
			#endif

			} // namespace tamaas