asnumber.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifndef DUNE_COMMON_ASNUMBER_HH
#define DUNE_COMMON_ASNUMBER_HH
 
#include <dune/common/typetraits.hh>
#include <dune/common/fmatrix.hh>
#include <dune/common/fvector.hh>
 
 
namespace Dune {
 
namespace Impl {
 
  template<class T>
  requires (Dune::IsNumber<T>::value)
  const T& asNumber(const T& t)
  {
    return t;
  }
 
  template<class T>
  const T& asNumber(const Dune::FieldVector<T, 1>& t)
  {
    return t[0];
  }
 
  template<class T>
  const T& asNumber(const Dune::FieldMatrix<T, 1, 1>& t)
  {
    return t[0][0];
  }
 
} // end namespace Impl
 
} // end namespace Dune
 
#endif // DUNE_COMMON_ASNUMBER_HH