singlevalueset.hh

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#ifndef DUNE_MULTIDOMAINGRID_SINGLEVALUESET_HH
#define DUNE_MULTIDOMAINGRID_SINGLEVALUESET_HH
 
#include <limits>
#include <cstddef>
#include <cstdint>
#include <dune/common/typetraits.hh>
#include <dune/common/exceptions.hh>
#include <type_traits>
#include <cassert>
 
namespace Dune {
 
namespace mdgrid {
 
template<typename SI>
class SingleValueSet;
 
 
template<typename SI>
bool setContains(const SingleValueSet<SI>& a,
                 const SingleValueSet<SI>& b);
 
 
template<typename SI>
void setAdd(SingleValueSet<SI>& a,
            const SingleValueSet<SI>& b);
 
 
template<typename SI>
class SingleValueSet {
 
  friend bool setContains<>(const SingleValueSet<SI>& a,
                        const SingleValueSet<SI>& b);
 
  friend void setAdd<>(SingleValueSet<SI>& a,
                   const SingleValueSet<SI>& b);
 
public:
 
  typedef SI SubDomainIndex;
 
  static const std::size_t maxSize = 1;
  static const SubDomainIndex emptyTag = ~SubDomainIndex(0);
  typedef const SubDomainIndex* Iterator;
  typedef SingleValueSet<SubDomainIndex> This;
 
  enum SetState {emptySet,simpleSet,multipleSet};
 
  struct DataHandle
  {
    typedef SubDomainIndex DataType;
 
    static bool fixedSize(int dim, int codim)
    {
      return true;
    }
 
    static std::size_t size(const SingleValueSet& sds)
    {
      return 1;
    }
 
    template<typename MessageBufferImp>
    static void gather(MessageBufferImp& buf, const SingleValueSet& sds)
    {
      buf.write(sds._set);
    }
 
    template<typename MessageBufferImp>
    static void scatter(MessageBufferImp& buf, SingleValueSet& sds, std::size_t n)
    {
      SubDomainIndex i;
      buf.read(i);
      assert(sds._set == emptyTag || sds._set == i);
      sds._set = i;
    }
 
  };
 
  Iterator begin() const {
    return &_set;
  }
 
  Iterator end() const {
    return &_set + (_set != emptyTag ? 1 : 0);
  }
 
  bool contains(SubDomainIndex domain) const {
    return _set == domain;
  }
 
  template<typename Set>
  bool containsAll(const Set& set) const {
    return setContains(*this,set);
  }
 
  bool simple() const {
    return _set != emptyTag;
  }
 
  bool empty() const {
    return _set == emptyTag;
  }
 
  SetState state() const {
    return _set == emptyTag ? emptySet : simpleSet;
  }
 
  std::size_t size() const {
    return _set == emptyTag ? 0 : 1;
  }
 
  void clear() {
    _set = emptyTag;
  }
 
  void add(SubDomainIndex domain) {
    assert(_set == emptyTag || _set == domain);
    _set = domain;
  }
 
  void remove(SubDomainIndex domain) {
    assert(_set == domain);
    _set = emptyTag;
  }
 
  void set(SubDomainIndex domain) {
    _set = domain;
  }
 
  template<typename Set>
  void addAll(const Set& set) {
    setAdd(*this,set);
  }
 
  int domainOffset(SubDomainIndex domain) const {
    assert(_set == domain);
    return 0;
  }
 
  SingleValueSet() :
    _set(emptyTag)
  {}
 
private:
  SubDomainIndex _set;
 
};
 
 
template<typename SI>
inline bool setContains(const SingleValueSet<SI>& a,
                        const SingleValueSet<SI>& b) {
  return a._set == b._set;
}
 
template<typename SI>
inline void setAdd(SingleValueSet<SI>& a,
                   const SingleValueSet<SI>& b) {
  assert(a._set == SingleValueSet<SI>::emptyTag || a._set == b._set);
  a._set = b._set;
}
 
} // namespace mdgrid
 
} // namespace Dune
 
#endif // DUNE_MULTIDOMAINGRID_SINGLEVALUESET_HH