/usr/include/dune/localfunctions/utility/interpolationhelper.hh is in libdune-localfunctions-dev 2.5.0-2.
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=4 sw=2 sts=2:
#ifndef GENERIC_INTERPOLATIONHELPER_HH
#define GENERIC_INTERPOLATIONHELPER_HH
#include <vector>
#include <dune/common/fvector.hh>
#include <dune/localfunctions/utility/field.hh>
namespace Dune
{
// A small helper class to avoid having to
// write the interpolation twice (once for function
// and once for a basis)
template< class F, unsigned int dimension >
struct InterpolationHelper
{
template <class Func,class Container, bool type>
struct Helper;
};
template <class F,unsigned int d>
template <class Func,class Vector>
struct InterpolationHelper<F,d>::Helper<Func,Vector,true>
// Func is of Function type
{
typedef std::vector< Dune::FieldVector<F,d> > Result;
Helper(const Func & func, Vector &vec)
: func_(func),
vec_(vec),
tmp_(1)
{}
const typename Vector::value_type &operator()(unsigned int row,unsigned int col)
{
return vec_[row];
}
template <class Fy>
void set(unsigned int row,unsigned int col,
const Fy &val)
{
assert(col==0);
assert(row<vec_.size());
field_cast( val, vec_[row] );
}
template <class Fy>
void add(unsigned int row,unsigned int col,
const Fy &val)
{
assert(col==0);
assert(row<vec_.size());
vec_[row] += field_cast<typename Vector::value_type>(val);
}
template <class DomainVector>
const Result &evaluate(const DomainVector &x) const
{
typename Func::DomainType xx ;
typename Func::RangeType ff ;
field_cast(x,xx);
func_.evaluate(xx,ff);
field_cast(ff, tmp_[0] );
return tmp_;
}
unsigned int size() const
{
return 1;
}
const Func &func_;
Vector &vec_;
mutable Result tmp_;
};
template <class F,unsigned int d>
template <class Basis,class Matrix>
struct InterpolationHelper<F,d>::Helper<Basis,Matrix,false>
// Func is of Basis type
{
typedef std::vector< Dune::FieldVector<F,d> > Result;
Helper(const Basis & basis, Matrix &matrix)
: basis_(basis),
matrix_(matrix),
tmp_(basis.size()) {}
const F &operator()(unsigned int row,unsigned int col) const
{
return matrix_(row,col);
}
F &operator()(unsigned int row,unsigned int col)
{
return matrix_(row,col);
}
template <class Fy>
void set(unsigned int row,unsigned int col,
const Fy &val)
{
assert(col<matrix_.cols());
assert(row<matrix_.rows());
field_cast(val,matrix_(row,col));
}
template <class Fy>
void add(unsigned int row,unsigned int col,
const Fy &val)
{
assert(col<matrix_.cols());
assert(row<matrix_.rows());
matrix_(row,col) += val;
}
template <class DomainVector>
const Result &evaluate(const DomainVector &x) const
{
basis_.template evaluate<0>(x,tmp_);
return tmp_;
}
unsigned int size() const
{
return basis_.size();
}
const Basis &basis_;
Matrix &matrix_;
mutable Result tmp_;
};
}
#endif // GENERIC_INTERPOLATIONHELPER_HH
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