qoi_set.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2025 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_QOI_SET_H
#define LIBMESH_QOI_SET_H


// Local Includes
#include "libmesh/libmesh_common.h"

// C++ Includes
#include <vector>

namespace libMesh
{

// Forward Declarations
class System;

class QoISet
{
public:
  class iterator
  {
  public:
    iterator(std::size_t i, const std::vector<bool> & v) : _i(i), _vecbool(v)
    {
      while (_i < _vecbool.size() && !_vecbool[_i])
        _i++;
    }

    std::size_t operator*() const { return _i; }

    iterator & operator++()
    {
      do {
        _i++;
      } while (_i < _vecbool.size() && !_vecbool[_i]);
      return *this;
    }

    iterator operator++(int)
    {
      iterator it = *this;
      ++(*this);
      return it;
    }

    bool operator==(const iterator & other) const
    {
      libmesh_assert_equal_to (&_vecbool, &other._vecbool);
      return _i == other._i;
    }

    bool operator!=(const iterator & other) const
    {
      libmesh_assert_equal_to (&_vecbool, &other._vecbool);
      return _i != other._i;
    }

  private:

    std::size_t _i;

    const std::vector<bool> & _vecbool;
  };

  QoISet() : _indices(), _weights() {}

  explicit
  QoISet(const System & sys);

  explicit
  QoISet(std::vector<bool> indices) :
    _indices(std::move(indices)), _weights() {}

  explicit
  QoISet(const std::vector<unsigned int> & indices);

  void clear() { _indices.clear(); _weights.clear(); }

  std::size_t size(const System & sys) const;

  void add_indices(const std::vector<unsigned int> & indices);

  void add_index(std::size_t);

  void remove_indices(const std::vector<unsigned int> & indices);

  void remove_index(std::size_t);

  void set_weight(std::size_t, Real);

  Real weight(std::size_t) const;

  bool has_index(std::size_t) const;

  iterator begin() const { return iterator(0, _indices); }

private:
  std::vector<bool> _indices;

  std::vector<Real> _weights;
};



// ------------------------------------------------------------
// QoISet inline methods



inline
QoISet::QoISet(const std::vector<unsigned int> & indices) :
  _indices(), _weights()
{
  this->add_indices(indices);
}



inline
void QoISet::add_index(std::size_t i)
{
  if (i >= _indices.size())
    _indices.resize(i+1, true);
  _indices[i] = true;
}



inline
void QoISet::remove_index(std::size_t i)
{
  if (i >= _indices.size())
    _indices.resize(i+1, true);
  _indices[i] = false;
}



inline
bool QoISet::has_index(std::size_t i) const
{
  return (_indices.size() <= i || _indices[i]);
}



inline
void QoISet::set_weight(std::size_t i, Real w)
{
  if (_weights.size() <= i)
    _weights.resize(i+1, 1.0);

  _weights[i] = w;
}



inline
Real QoISet::weight(std::size_t i) const
{
  if (_weights.size() <= i)
    return 1.0;
  return _weights[i];
}

} // namespace libMesh

#endif // LIBMESH_QOI_SET_H