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// ------------------------------------------------------------------------
//
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2025 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Part of the source code is dual licensed under Apache-2.0 WITH
// LLVM-exception OR LGPL-2.1-or-later. Detailed license information
// governing the source code and code contributions can be found in
// LICENSE.md and CONTRIBUTING.md at the top level directory of deal.II.
//
// ------------------------------------------------------------------------
// It is very inefficient in the module system to have repeated
// #includes in many module partition files because when you 'import'
// those partitions, you also have to load everything they
// #included. In other words, you get the same content *many times*,
// once from each imported partition, rather than only once via the
// old-style #include system. We deal with this by wrapping all of our
// external packages into partitions that we can 'import' wherever we
// need.
// This is the file that wraps everything we need from METIS into one
// module partition.
module;
#include <deal.II/base/config.h>
#ifdef DEAL_II_WITH_METIS
extern "C"
{
# include <metis.h>
}
#endif
export module dealii.external.metis;
#ifdef DEAL_II_WITH_METIS
export
{
using ::idx_t;
using ::METIS_OPTION_SEED;
using ::METIS_PartGraphKway;
using ::METIS_PartGraphRecursive;
using ::METIS_SetDefaultOptions;
}
// METIS also defines symbols that are either
// implemented as macros, or perhaps as constants in header
// files. In the former case, they cannot be referenced in 'using'
// expressions, and so we need to work around things by creating
// *variables* of the same names. In the latter case, they are often
// implemented as constants with internal linkage that we can't
// re-export (e.g., if they are members of anonymous enums).
//
// Dealing with this situation requires creating some other set of
// variable, undefining the macro names, and then creating variables
// with the same names as the macro names. Because we would end up
// with name clashes if these new variables were in the global
// namespace for those MPI implementations that implement things as
// variables in the global namespace, we put everything into the
// dealii namespace.
//
// We put the exportable symbols into namespace 'dealii'. This is
// necessary for cases where the symbol we create is derived not from
// a preprocessor macro, but for example as a member of an anonymous
// enum. Such symbols can't be exported, so we declare a variable that
// we *can* export, but it will not have the type of the enum, but of
// the underlying int. The compiler will therefore complain that the
// variable we're creating here redeclares another one but with a
// different type. We can avoid this by putting things into our own
// namespace.
# define CREATE_EXPORTABLE_PREPROCESSOR_SYMBOL(sym) \
namespace dealii \
{ \
namespace Metis_Macros \
{ \
[[maybe_unused]] const auto exportable_##sym = sym; \
} \
} // namespace dealii
# define EXPORT_PREPROCESSOR_SYMBOL(sym) \
namespace dealii \
{ \
export const auto &sym = dealii::Metis_Macros::exportable_##sym; \
}
CREATE_EXPORTABLE_PREPROCESSOR_SYMBOL(METIS_NOPTIONS)
# undef METIS_NOPTIONS
EXPORT_PREPROCESSOR_SYMBOL(METIS_NOPTIONS)
#endif
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