/usr/include/dune/pdelab/function/sqrt.hh is in libdune-pdelab-dev 2.0.0-1.
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_SQRT_HH
#define DUNE_PDELAB_FUNCTION_SQRT_HH
#include <dune/common/static_assert.hh>
#include <dune/pdelab/common/function.hh>
namespace Dune {
namespace PDELab {
//! Take sqrt of a GridFunction
/**
* \tparam GF The type of the GridFunction to invert
*/
template<typename GF>
class SqrtGridFunctionAdapter
: public GridFunctionBase<typename GF::Traits,
SqrtGridFunctionAdapter<GF> >
{
dune_static_assert(GF::Traits::dimRange == 1, "Dimension of range must "
"be 1 to take the sqrt");
typedef typename GF::Traits T;
typedef GridFunctionBase<T, SqrtGridFunctionAdapter<GF> >
Base;
typedef typename T::RangeFieldType RF;
GF& gf;
public:
typedef typename Base::Traits Traits;
SqrtGridFunctionAdapter(GF& gf_)
: gf(gf_)
{ }
void evaluate(const typename Traits::ElementType &e,
const typename Traits::DomainType &x,
typename Traits::RangeType &y) const {
gf.evaluate(e,x,y);
y[0] = std::sqrt(y[0]);
}
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_SQRT_HH
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