/usr/include/dune/pdelab/function/minus.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_MINUS_HH
#define DUNE_PDELAB_FUNCTION_MINUS_HH
#include <cstddef>
#include <dune/pdelab/common/function.hh>
namespace Dune {
namespace PDELab {
//! Substract two GridFunctions
/**
* \tparam GF1 Type for the GridFunction on the left side of the minus
* \tparam GF2 Type for the GridFunction on the right side of the minus
*/
template<typename GF1, typename GF2>
class MinusGridFunctionAdapter
: public GridFunctionBase<typename GF1::Traits,
MinusGridFunctionAdapter<GF1,GF2> >
{
static_assert(std::size_t(GF1::Traits::dimRange) ==
std::size_t(GF2::Traits::dimRange),
"Range dimension must match for both operands of a "
"MinusGridFunctionAdapter");
typedef typename GF1::Traits T;
typedef GridFunctionBase<T, MinusGridFunctionAdapter<GF1,GF2> >
Base;
GF1& gf1;
GF2& gf2;
public:
typedef typename Base::Traits Traits;
MinusGridFunctionAdapter(GF1& gf1_, GF2& gf2_)
: gf1(gf1_), gf2(gf2_)
{ }
void evaluate(const typename Traits::ElementType &e,
const typename Traits::DomainType &x,
typename Traits::RangeType &y) const {
gf1.evaluate(e,x,y);
typename GF2::Traits::RangeType y2;
gf2.evaluate(e,x,y2);
y -= y2;
}
const typename Traits::GridViewType& getGridView() const {
return gf1.getGridView();
}
template<typename Time>
void setTime(Time time) {
gf1.setTime(time);
gf2.setTime(time);
}
};
} // namspace PDELab
} // namspace Dune
#endif // DUNE_PDELAB_FUNCTION_MINUS_HH
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