empty_cluster.hpp

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#ifndef NIHU_EMPTY_CLUSTER_HPP_INCLUDED
#define NIHU_EMPTY_CLUSTER_HPP_INCLUDED
 
#include "cluster.hpp"
 
namespace NiHu
{
namespace fmm
{
 
template <size_t Dim>
class empty_cluster;
 
template <size_t Dim>
struct cluster_traits<empty_cluster<Dim>>
{
    static size_t const dimension = Dim;
    typedef void multipole_t;
    typedef void local_t;
};
 
template <size_t Dim>
class empty_cluster
    : public cluster_base<empty_cluster<Dim>>
{
public:
    typedef cluster_base<empty_cluster<Dim>> base_t;
    typedef typename base_t::multipole_t multipole_t;
    typedef typename base_t::local_t local_t;
 
    multipole_t zero_multipole() const
    {
        return;
    }
 
    local_t zero_local() const
    {
        return;
    }
};
 
} // end of namespace fmm
} // end of namespace NiHu
 
#endif /* NIHU_EMPTY_CLUSTER_HPP_INCLUDED */