libmesh.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library 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 2.1 of the License, or (at your option) any later version.

// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef LIBMESH_LIBMESH_H
#define LIBMESH_LIBMESH_H


// Local includes
#include "libmesh/libmesh_base.h"
#include "libmesh/libmesh_common.h"
#include "libmesh/libmesh_config.h"

// C++ includes
#include <string>
#include <vector>

// Forward declarations
// For dealing with MPI stuff in VTK.
#if defined(LIBMESH_HAVE_MPI) && defined(LIBMESH_HAVE_VTK)
class vtkMPIController;
#endif

namespace TIMPI {
  class TIMPIInit;
}

#ifdef GETPOT_NAMESPACE
namespace GETPOT_NAMESPACE {
#endif
class GetPot;
#ifdef GETPOT_NAMESPACE
}
#endif

namespace libMesh
{

// Forward declarations
namespace Parallel {
  class Communicator;
}

class PerfLog;
enum SolverPackage : int;

class LibMeshInit
{
public:
#ifdef LIBMESH_HAVE_MPI

  LibMeshInit(int argc, const char * const * argv,
              MPI_Comm COMM_WORLD_IN=MPI_COMM_WORLD, int n_threads=-1);
#else
  LibMeshInit(int argc, const char * const * argv,
              int COMM_WORLD_IN=0, int n_threads=-1);
#endif

  virtual ~LibMeshInit();

  const Parallel::Communicator & comm() const { return *_comm; }

  Parallel::Communicator & comm() { return *_comm; }

private:
  // Should we just bite the bullet, use unique_ptr here, and bring an
  // #include <memory> into everything?
  TIMPI::TIMPIInit * _timpi_init;

  // Or should we keep this around so we can still inline its
  // accessors despite forward declaring _timpi_init?
  //
  // This is constructed from the TIMPI::Communicator, for backwards
  // compatibility.
  Parallel::Communicator * _comm;

#if defined(LIBMESH_HAVE_MPI) && defined(LIBMESH_HAVE_VTK)
  // VTK object for dealing with MPI stuff in VTK.
  // This can't be a std::unique_ptr because VTK makes the destructor
  // protected and forces us to use a named destructor manually
  vtkMPIController * _vtk_mpi_controller;
#endif

#ifdef LIBMESH_ENABLE_EXCEPTIONS
  static std::terminate_handler _old_terminate_handler;
#endif

  static PerfLog & perf_log();

  friend void libmesh_abort();
  friend void libmesh_terminate_handler();
};

bool initialized ();

bool closed ();

bool on_command_line (std::string arg);

template <typename T>
T command_line_value (const std::string &, T);
template <typename T>
T command_line_value (const std::vector<std::string> &, T);

template <typename T>
T command_line_next (std::string name, T default_value);

template <typename T>
void command_line_vector (const std::string &, std::vector<T> &);

std::vector<std::string> command_line_names();

void add_command_line_name(const std::string & name);

void add_command_line_names(const GetPot & getpot);


#ifdef LIBMESH_USE_COMPLEX_NUMBERS
extern const Number imaginary;
#endif

SolverPackage default_solver_package ();

#ifdef LIBMESH_DEFAULT_QUADRUPLE_PRECISION
constexpr Real operator ""_R(const char * r) { return Real(r); }
#else
constexpr Real operator ""_R(long double r) { return r; }
constexpr Real operator ""_R(unsigned long long r) { return Real(r); }
#endif

const Real pi = 3.1415926535897932384626433832795029_R;

const Number zero = 0.;

const unsigned int invalid_uint = static_cast<unsigned int>(-1);

const int invalid_int = std::numeric_limits<int>::max();

} // namespace libMesh

#endif // LIBMESH_LIBMESH_H