read_vector.h

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// -----------------------------------------------------------------------------
//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
// Copyright (C) 2023 - 2024 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Detailed license information governing the source code and contributions
// can be found in LICENSE.md and CONTRIBUTING.md at the top level directory.
//
// -----------------------------------------------------------------------------
 
#ifndef dealii_lac_read_vector_h
#define dealii_lac_read_vector_h
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/array_view.h>
#include <deal.II/base/enable_observer_pointer.h>
#include <deal.II/base/types.h>
 
DEAL_II_NAMESPACE_OPEN
 
template <typename Number>
class ReadVector : public EnableObserverPointer
{
public:
  using value_type = Number;
  using size_type  = types::global_dof_index;
 
  virtual size_type
  size() const = 0;
 
  virtual void
  extract_subvector_to(const ArrayView<const types::global_dof_index> &indices,
                       const ArrayView<Number> &elements) const = 0;
};
 
DEAL_II_NAMESPACE_CLOSE
#endif