/usr/include/dune/pdelab/function/sqr.hh is in libdune-pdelab-dev 2.5.0~20170124g7cf9f47a-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=8 sw=2 sts=2:
#ifndef DUNE_PDELAB_FUNCTION_SQR_HH
#define DUNE_PDELAB_FUNCTION_SQR_HH
#include <dune/common/fvector.hh>
#include <dune/pdelab/common/function.hh>
namespace Dune {
namespace PDELab {
//! Take square of a GridFunction
/**
* \tparam GF The type of the GridFunction to square
*/
template<typename GF>
class SqrGridFunctionAdapter :
public GridFunctionBase<
GridFunctionTraits<
typename GF::Traits::GridViewType,
typename GF::Traits::RangeFieldType, 1,
FieldVector<typename GF::Traits::RangeFieldType, 1>
>,
SqrGridFunctionAdapter<GF>
>
{
typedef GridFunctionTraits<
typename GF::Traits::GridViewType,
typename GF::Traits::RangeFieldType, 1,
FieldVector<typename GF::Traits::RangeFieldType, 1>
> T;
typedef GridFunctionBase<T, SqrGridFunctionAdapter<GF> >
Base;
typedef typename T::RangeFieldType RF;
GF& gf;
public:
typedef typename Base::Traits Traits;
SqrGridFunctionAdapter(GF& gf_)
: gf(gf_)
{ }
void evaluate(const typename Traits::ElementType &e,
const typename Traits::DomainType &x,
typename Traits::RangeType &y) const
{
typename GF::Traits::RangeType y_;
gf.evaluate(e,x,y_);
y[0] = y_*y_;
}
const typename Traits::GridViewType& getGridView() const {
return gf.getGridView();
}
template<typename Time>
void setTime(Time time) { gf.setTime(time); }
};
} // namspace PDELab
} // namspace Dune
#endif // DUNE_PDELAB_FUNCTION_SQR_HH
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