support3D.h

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/*
 * support3D.h
 *
 *  Created on: 31.10.2024
 *      Author: Markus Knodel
 */
 
#ifndef UGCORE_UGBASE_LIB_GRID_ALGORITHMS_EXTRUSION_SUPPORT3D_H_
#define UGCORE_UGBASE_LIB_GRID_ALGORITHMS_EXTRUSION_SUPPORT3D_H_
 
#include <iostream>
#include <stdexcept>
#include <cmath>
#include <iostream>
#include <stdlib.h>
#include <vector>
#include <assert.h>
#include <string>
#include <sstream>
#include <utility>
#include <vector>
#include <type_traits>
 
#include "support.h"
 
// TODO FIXME
// verschlanken,
// Verdoppelungen weg,
// Namen generalisieren
// nicht vertex spezifisch zB
// sondern lowest dim oder so
 
namespace ug
{
 
namespace support
{
 
template<typename ELEMTYP>
bool addElem(std::vector<ELEMTYP> & knownElems, ELEMTYP elemToAdd )
{
  bool unknown = true;
 
  for( ELEMTYP elmKnown : knownElems )
  {
    if( elemToAdd == elmKnown )
    {
      unknown = false;
      break;
    }
  }
 
  if( unknown )
    knownElems.push_back(elemToAdd);
 
  return unknown;
 
}
 
 
#if 0
 
template<typename ELEMTYP, typename INDEX_TYP>
class ElemInfo
{
public:
 
  ElemInfo( ELEMTYP const & elem, INDEX_TYP sudo )
  : m_elem(elem), m_sudo(sudo)
  {
  }
 
 
 
private:
 
  ELEMTYP m_elem;
  INDEX_TYP m_sudo;
 
  ElemInfo() {};
 
 
};
 
template<
typename FACETYP,
typename NORMALTYP,
typename VOLUMETYP,
typename EDGETYP,
typename INDEX_TYP
>
class VertexFractureQuadrupel
{
public:
 
  using ElemInfoFac = ElemInfo<FACETYP,INDEX_TYP>;
 
  //face, normal, volume, edge
 
//  VertexFractureQuadrupel()
//  {};
 
 
  VertexFractureQuadrupel( ElemInfoFac const & fracFaceInfo,
               VOLUMETYP const & attVolume,
               NORMALTYP const & normal,
               std::pair<EDGETYP,EDGETYP> const & volCutEdges,
               std::pair<ElemInfoFac,ElemInfoFac> const & volCutEdgeFaces )
  : m_fracFaceInfo(fracFaceInfo),
    m_attVolume(attVolume),
    m_normal(normal),
    m_volCutEdges(volCutEdges),
    m_volCutEdgeFaces(volCutEdgeFaces)
  {
  }
 
  // todo fixme getter und ggf auch setter, aber vermutlich nur getter implementieren!!!
 
private:
 
//  FACETYP const getFace() const { return m_full; }
//  NORMALTYP const getNormal() const { return m_normal; }
//  VOLUMETYP const getVolume() const { return m_volume; }
//  EDGETYP const getEdge() const { return m_edge; }
 
  ElemInfo<FACETYP,INDEX_TYP> m_fracFaceInfo;
  VOLUMETYP m_attVolume;
  NORMALTYP m_normal;
  std::pair<EDGETYP,EDGETYP> m_volCutEdges;
  std::pair<ElemInfoFac,ElemInfoFac> m_volCutEdgeFaces;
 
//private:
//
//  FACETYP m_face;
//  NORMALTYP m_normal;
//  VOLUMETYP m_volume;
//  EDGETYP m_edge;
 
  VertexFractureQuadrupel()
  {};
};
#endif
 
 
template <
typename MANIFELM,
typename LOWDIMELM,
typename INDEX_TXP
>
class AttachedGeneralElem
{
public:
  using PairLowEl = std::pair<LOWDIMELM,LOWDIMELM>;
 
  using AttGenElm = AttachedGeneralElem<MANIFELM,LOWDIMELM,INDEX_TXP>;
 
  // for fracture elements
  AttachedGeneralElem( MANIFELM const & manifElm,
          PairLowEl const & lowElm
          )
  :
    m_manifElm(manifElm), m_pairLowElm(lowElm)
  {
  };
 
  MANIFELM const getManifElm() const { return m_manifElm;}
//  PairLowEl const getLowElm() const { return m_lowElm; }
  PairLowEl const getPairLowElm() const { return m_pairLowElm; }
 
  bool const isNeighboured( AttGenElm const & attElm )
  const
  {
//    MANIFELM manifElmOther = attElm.getManifElm();
    PairLowEl lowElmOther = attElm.getPairLowElm();
//    INDEX_TXP sudoOther = attElm.getSudo();
 
    PairLowEl lowElmThis = this->m_pairLowElm;
 
    std::vector<bool> test;
 
    test.push_back( lowElmOther.first  == lowElmThis.first );
    test.push_back( lowElmOther.second  == lowElmThis.first );
    test.push_back( lowElmOther.first  == lowElmThis.second );
    test.push_back( lowElmOther.second  == lowElmThis.second );
 
    INDEX_TXP countCorr = 0;
 
    for( auto const t : test )
    {
      if( t )
        countCorr++;
    }
 
    if( countCorr == 1 )
      return true;
 
    if( countCorr > 1 )
      UG_THROW("zu viele gleiche Ecken " << std::endl);
 
    return false;
  }
 
  bool const isNeighbouredAtSpecificSide( AttGenElm const & attElm,
                                      LOWDIMELM const & specificLDE )
  const
  {
    PairLowEl lowElmOther = attElm.getPairLowElm();
 
    PairLowEl lowElmThis = this->m_pairLowElm;
 
    // test if the specific element is part of at least
    // one of the faces
 
    bool otherFirst = ( lowElmOther.first == specificLDE );
    bool otherSecond = ( lowElmOther.second == specificLDE );
 
    bool thisFirst = ( lowElmThis.first == specificLDE );
    bool thisSecond = ( lowElmThis.second == specificLDE );
 
    bool isPartOfThisFace = ( thisFirst || thisSecond );
    bool isPartOfOtherFace = ( otherFirst || otherSecond );
 
    if( ! isPartOfOtherFace || ! isPartOfThisFace )
    {
      UG_LOG("not part of one of the faces " << std::endl);
      return false;
    }
 
    if( otherFirst && thisFirst )
    {
      if( lowElmOther.first  == lowElmThis.first )
        return true;
    }
    else if( otherFirst && thisSecond )
    {
      if( lowElmOther.first  == lowElmThis.second )
        return true;
    }
    else if( otherSecond && thisFirst )
    {
      if( lowElmOther.second  == lowElmThis.first )
        return true;
    }
    else if( otherSecond && thisSecond )
    {
      if( lowElmOther.second  == lowElmThis.second )
        return true;
    }
 
    return false;
  }
 
  bool const testIfEquals( AttGenElm const & attElm )
  const
  {
    MANIFELM manifElmOther = attElm.getManifElm();
    PairLowEl lowElmOther = attElm.getPairLowElm();
 
    if(    manifElmOther == this->m_manifElm
      && hasSameEdgePair( lowElmOther )
//        && lowElmOther == this->m_pairLowElm
    )
    {
      return true;
    }
 
    if( manifElmOther == this->m_manifElm && ! hasSameEdgePair( lowElmOther ) )
    {
      UG_LOG("gleiches face aber andere Ecken???" << std::endl);
      UG_THROW("gleiches face aber andere Ecken???" << std::endl);
    }
 
    return false;
  }
 
 
protected:
 
  MANIFELM m_manifElm;
  PairLowEl m_pairLowElm;
 
  bool const hasSameEdgePair( PairLowEl const & epTwo ) const
  {
    PairLowEl const & epOne = this->m_pairLowElm;
 
    if(    ( epOne.first == epTwo.first && epOne.second == epTwo.second )
      ||  ( epOne.first == epTwo.second && epOne.second == epTwo.first )
    )
    {
      return true;
    }
 
    return false;
  }
 
};
 
 
 
 
 
// TODO FIXME vertex fracture triplett
// vereinigen mit  AttachedGeneralElem !!! davon ableiten!!!
// doppelte Strukturen!!!
 
#if 0
// [[DEPRECATED]]
// wird abgelöst durch fortschrittlichere Klassen, bald nicht mehr nötig
template <
typename MANIFOLDTYP, // 3D: Face
typename INDEXTYP, // int oder unsinged int oder short oder unsigned short etc
typename FULLDIMTYP, // 3D: Volume
typename SENKRECHTENTYP, // 3D und 2D: ug::vector3
typename LOWDIMTYP // 3D: Edge (2D nicht benötigt)
>
class VertexFractureTripleMF
: public AttachedGeneralElem<MANIFOLDTYP,LOWDIMTYP,INDEXTYP>
{
 
private:
  using AttGenEl = AttachedGeneralElem<MANIFOLDTYP,LOWDIMTYP,INDEXTYP>;
 
public:
 
  using PairLowEl = std::pair<LOWDIMTYP,LOWDIMTYP>;
 
  VertexFractureTripleMF( MANIFOLDTYP const & manifElm, INDEXTYP sudo,
              FULLDIMTYP const & fullElm,
              SENKRECHTENTYP const & normal,
              PairLowEl const & pairLowElm )
  : //m_manifElm(manifElm),
    AttGenEl(manifElm,pairLowElm),
    m_sudo(sudo), m_fullElm(fullElm),
    m_normal(normal), m_newNormal(normal)
//    ,
//    m_pairLowElm(pairLowElm)
  {
  };
 
//  MANIFOLDTYP const getManifElm() const { return m_manifElm; }
 
  INDEXTYP const getSudoElm() const { return m_sudo; }
 
  FULLDIMTYP const getFullElm() const { return m_fullElm; }
 
  SENKRECHTENTYP const getNormal() const { return m_normal; }
 
  // TODO FIXME unklar, ob neue Normale irgendwo gebraucht wird
  // falls notwendig in die Fracture Klasse einführen,
  // die diese Klasse hier mittelfristig ablösen soll vollständig
  void setNewNormal( SENKRECHTENTYP const & chNorml ) { m_newNormal = chNorml; }
 
  SENKRECHTENTYP const getNewNormal() const { return m_newNormal; }
 
//  PairLowEl const getPairLowElm() const { return m_pairLowElm; }
 
private:
 
//  MANIFOLDTYP m_manifElm;
  INDEXTYP m_sudo;
  FULLDIMTYP m_fullElm;
  SENKRECHTENTYP  m_normal;
  SENKRECHTENTYP  m_newNormal;
//  PairLowEl m_pairLowElm;
 
  VertexFractureTripleMF()
  {};
 
};
#endif
 
 
// TODO FIXME das muss angepasst werden, ist noch wie für 2D Fall bisher
enum FracTypVol { SingleFrac = 2, TEnd = 3, XCross = 4 };
 
template < typename VRT, typename IndTyp >
class CrossingVertexInfoVol
{
 
public:
 
  CrossingVertexInfoVol( VRT const & crossVrt, FracTypVol fracTyp )
  : m_crossVrt(crossVrt), m_fracTyp( fracTyp ),
    m_vecShiftedVrts(std::vector<VRT>())
  ,  m_vecShiftedVrtsWithTypInf(std::vector<std::pair<VRT,bool>>())
  , m_numberAtFreeSide(0)
  {
  }
 
  VRT getCrossVertex() const { return m_crossVrt; }
 
  FracTypVol getFracTyp() const { return m_fracTyp; }
 
  void addShiftVrtx( VRT const & vrt, bool isAtFreeSide = false )
  {
    m_vecShiftedVrts.push_back(vrt);
 
//    if( m_fracTyp == TEnd )
//    {
//      std::pair<VRT, bool > addSVI( vrt, isAtFreeSide );
//      m_vecShiftedVrtsWithTypInf.push_back(addSVI);
//
//      if( isAtFreeSide )
//        m_numberAtFreeSide++;
//
//      if( m_numberAtFreeSide > 1 )
//        UG_THROW("was ist das fuer ein T Ende" << std::endl);
//    }
 
  }
 
  void setShiftVrtx( std::vector<VRT> const & vecVrt ) { m_vecShiftedVrts = vecVrt; }
 
  std::vector<VRT> getVecShiftedVrts() const
  {
    return m_vecShiftedVrts;
  }
 
  std::vector<std::pair<VRT,bool>> getVecShiftedVrtsWithTypInfo() const
  {
//    if( m_fracTyp != TEnd )
//      UG_THROW("fuer Kreuz nicht erlaubt " << std::endl);
 
    return m_vecShiftedVrtsWithTypInf;
  }
 
 
private:
 
  VRT m_crossVrt;
  std::vector<VRT> m_vecShiftedVrts;
  std::vector<std::pair<VRT,bool>> m_vecShiftedVrtsWithTypInf;
  FracTypVol m_fracTyp;
  IndTyp m_numberAtFreeSide;
};
 
 
 
 
// info for a vertex: face and attached edges, for fractures only
//  derived from the similar class without fracture property!
template <
typename MANIFELM,
typename LOWDIMELM,
typename INDEX_TXP,
typename NORMAL_VEC
>
class AttachedFractElem
: public AttachedGeneralElem<MANIFELM,LOWDIMELM,INDEX_TXP>
// TODO FIXME derive from AttachedGeneralElem
{
public:
  using PairLowEl = std::pair<LOWDIMELM,LOWDIMELM>;
 
  using AttFractElm = AttachedFractElem<MANIFELM,LOWDIMELM,INDEX_TXP,NORMAL_VEC>;
 
  using AttGenElm = AttachedGeneralElem<MANIFELM,LOWDIMELM,INDEX_TXP>;
 
  // for fracture elements
  AttachedFractElem( MANIFELM const & manifElm,
          PairLowEl & lowElm,
          INDEX_TXP sudo,
          NORMAL_VEC const & normalVec )
  :
    AttGenElm(manifElm,lowElm),
    //m_manifElm(manifElm), m_lowElm(lowElm),
    m_sudo(sudo),
    m_normalVec(normalVec)
  {
  };
 
 
//  MANIFELM const getManifElm() const { return m_manifElm;}
//  PairLowEl const getLowElm() const { return m_lowElm; }
  INDEX_TXP const getSudo() const { return m_sudo; };
 
  NORMAL_VEC const getNormalVec() const { return m_normalVec; }
 
  bool const testIfEquals( AttFractElm const & attElm )
  const
  {
    bool geomEqu = AttGenElm::testIfEquals(attElm);
 
//    MANIFELM manifElmOther = attElm.getManifElm();
//    PairLowEl lowElmOther = attElm.getLowElm();
    INDEX_TXP sudoOther = attElm.getSudo();
 
//    if(    manifElmOther == this->m_manifElm
//      && lowElmOther == this->m_lowElm
//      && sudoOther == this->m_sudo
//    )
//    {
//      return true;
//    }
 
    if( geomEqu && sudoOther == this->m_sudo )
    {
      return true;
    }
 
    return false;
  }
 
 
//  bool const testIfEquals( AttachedFractElem<MANIFELM,LOWDIMELM,INDEX_TXP> const & attElm )
//  const
//  {
//    MANIFELM manifElmOther = attElm.getManifElm();
//    PairLowEl lowElmOther = attElm.getLowElm();
//    INDEX_TXP sudoOther = attElm.getSudo();
//
//    if(    manifElmOther == this->m_manifElm
//      && lowElmOther == this->m_lowElm
//      && sudoOther == this->m_sudo
//    )
//    {
//      return true;
//    }
//
//    return false;
//  }
 
//  bool const isNeighboured(  AttachedFractElem<MANIFELM,LOWDIMELM,INDEX_TXP> const & attElm )
//  const
//  {
//    PairLowEl lowElmOther = attElm.getLowElm();
//
//    PairLowEl lowElmThis = this->m_lowElm;
//
//    std::vector<bool> test;
//
//    test.push_back( lowElmOther.first  == lowElmThis.first );
//    test.push_back( lowElmOther.second  == lowElmThis.first );
//    test.push_back( lowElmOther.first  == lowElmThis.second );
//    test.push_back( lowElmOther.second  == lowElmThis.second );
//
//    INDEX_TXP countCorr = 0;
//
//    for( auto const t : test )
//    {
//      if( t )
//        countCorr++;
//    }
//
//    if( countCorr == 1 )
//      return true;
//
//    if( countCorr > 1 )
//      UG_THROW("zu viele gleiche Ecken " << std::endl);
//
//    return false;
//  }
//
//  bool const isNeighbouredAtSpecificSide( AttachedFractElem<MANIFELM,LOWDIMELM,INDEX_TXP> const & attElm,
//                                      LOWDIMELM const & specificLDE )
//  const
//  {
//    PairLowEl lowElmOther = attElm.getLowElm();
//
//    PairLowEl lowElmThis = this->m_lowElm;
//
//    // test if the specific element is part of at least
//    // one of the faces
//
//    bool otherFirst = ( lowElmOther.first == specificLDE );
//    bool otherSecond = ( lowElmOther.second == specificLDE );
//
//    bool thisFirst = ( lowElmThis.first == specificLDE );
//    bool thisSecond = ( lowElmThis.second == specificLDE );
//
//    bool isPartOfThisFace = ( thisFirst || thisSecond );
//    bool isPartOfOtherFace = ( otherFirst || otherSecond );
//
//    if( ! isPartOfOtherFace || ! isPartOfThisFace )
//    {
//      UG_LOG("not part of one of the faces " << std::endl);
//      return false;
//    }
//
//    if( otherFirst && thisFirst )
//    {
//      if( lowElmOther.first  == lowElmThis.first )
//        return true;
//    }
//    else if( otherFirst && thisSecond )
//    {
//      if( lowElmOther.first  == lowElmThis.second )
//        return true;
//    }
//    else if( otherSecond && thisFirst )
//    {
//      if( lowElmOther.second  == lowElmThis.first )
//        return true;
//    }
//    else if( otherSecond && thisSecond )
//    {
//      if( lowElmOther.second  == lowElmThis.second )
//        return true;
//    }
//
//    return false;
//  }
 
private:
//  MANIFELM m_manifElm;
//  PairLowEl m_lowElm;
  INDEX_TXP m_sudo;
  NORMAL_VEC m_normalVec;
 
 
};
 
 
// a quasi exact double, but only used for boundary faces, to avoid mismatch with frac faces
template <
typename MANIFELM,
typename LOWDIMELM,
typename INDEX_TXP,
typename NORMAL_VEC
>
class AttachedBoundryElem
: public AttachedFractElem<MANIFELM,LOWDIMELM,INDEX_TXP,NORMAL_VEC>
{
public:
  using PairLowEl = std::pair<LOWDIMELM,LOWDIMELM>;
 
  using AttBndryElm = AttachedBoundryElem<MANIFELM,LOWDIMELM,INDEX_TXP,NORMAL_VEC>;
 
  using AttFractElm = AttachedFractElem<MANIFELM,LOWDIMELM,INDEX_TXP,NORMAL_VEC>;
 
 
  // for boundary elements
  AttachedBoundryElem( MANIFELM const & manifElm,
          PairLowEl & lowElm,
          INDEX_TXP sudo,
          NORMAL_VEC const & normalVec )
  :
    AttFractElm( manifElm, lowElm, sudo, normalVec)
  {
  };
};
 
 
// class to help count and store a bool and a number of templete type
// comparable to std::pair<bool,int> but more dedicated to the specific aim
// TODO FIXME adapt for 3D case, figure out if inner end, and number of fracs sourrounding
// CAUTION is also used for edges, but still uses
// vertex as indicator - name should be made more flexible
 
// die meisten Funktionen in dieser Klasse:
// DEPRECATED, to be replaced in near future everywhere, not really useful any more
// due to the Stasi algorithm
// [[deprecated]] ab C++14, leider nicht passend zur Konvention C++11
// die Sudo-Liste wollen wir aber lassen
template<
typename T,
typename ATT_ELEM
>
class VertexFracturePropertiesVol
{
public:
 
  using pairTB = std::pair<T,bool>;
  using VecPairTB = std::vector<pairTB>;
 
 
//  VertexFracturePropertiesVol( bool isBndFracVertex,  T numberCrossingFracsInVertex )
//  : m_isBndFracVertex(isBndFracVertex), m_numberCountedFracsInVertex(numberCrossingFracsInVertex)
//  {
//  };
 
  // DEPRECATED, kann entfernt werden vermutlich, CHECK, TODO FIXME
  enum VrtxFracStatus { noFracSuDoAtt = 0,
              oneFracSuDoAtt = 1,
              twoFracSuDoAtt = 2,
              threeFracSuDoAtt = 3 };
 
  VertexFracturePropertiesVol()
  : m_isBndFracVertex(false), m_numberCountedFracsInVertex(0),
    m_status( noFracSuDoAtt ),
    m_sudoList( std::vector<T>() ) //,
//    m_sudosClosed(VecPairTB()),
//    m_vecAttElem(std::vector<ATT_ELEM>())
//    VertexFracturePropertiesVol( false, 0 )
  {
  };
 
  void setIsBndFracVertex( bool iBDV = true )
  {
    m_isBndFracVertex = iBDV;
  }
 
  void setNumberCrossingFracsInVertex( T const & nCFIV )
  {
    m_numberCountedFracsInVertex = nCFIV;
  }
 
  bool getIsBndFracVertex()
  {
    return m_isBndFracVertex;
  }
 
//  T getCountedNumberFracsInVertex()
//  {
//    return m_numberCountedFracsInVertex;
//  }
 
 
  T getNumberFracEdgesInVertex()
  {
    return m_numberCountedFracsInVertex;
  }
 
//  T getNumberCrossingFracsInVertex()
//  {
//    if( m_isBndFracVertex )
//      return m_numberCountedFracsInVertex;
//
//    // for inner vertices, each edge passed when
//    // fractures are counted along their edges
//    // that the vertizes get hit twice for each fracture run
//    // only for boundary vertices, this happens only once per fracture
//    T multipeInnerHits = 2;
//
//    T rest = m_numberCountedFracsInVertex % multipeInnerHits;
//
//    if( rest != 0 )
//    {
//
//      throw std::runtime_error("error");
//
//      return 0;
//    }
//
//    return m_numberCountedFracsInVertex / multipeInnerHits;
//  }
 
  VertexFracturePropertiesVol & operator++( int a )
  {
    m_numberCountedFracsInVertex++;
    return *this;
  }
 
 
  VrtxFracStatus getVrtxFracStatus()
  {
    return m_status;
  }
 
  // caution: returns false if sudo already known, but no problem, feature, not bug
  // so never stop the program if false returned here, this is good news
  bool addFractSudo( T const & sudo )
  {
    bool alreadyInList = false;
 
    for( auto const & availSudo : m_sudoList )
    {
      if( sudo == availSudo )
        alreadyInList = true;
    }
 
    if( ! alreadyInList )
    {
      m_sudoList.push_back( sudo );
    }
 
    return adaptVrtxFracStatus();
  }
 
  // setter private to avoid abusive use
  std::vector<T> const getSudoList() const
  {
    return m_sudoList;
  }
 
//  bool setIsAClosedFracture( T sudoNow, bool isClosedNow )
//  {
//
//    T alreadyKnownMult = 0;
//
//    for( auto & suSu : m_sudosClosed )
//    {
//      T & sudoVal = suSu.first;
//      bool & isClosedVal = suSu.second;
//
//      if( sudoVal == sudoNow )
//      {
//        alreadyKnownMult++;
//
//        UG_LOG("Reassign sudo surround " << std::endl);
//
//        if( isClosedVal != isClosedNow )
//          UG_THROW("change property sudo surrounded, why?" << std::endl);
//
//        isClosedVal = isClosedNow;
//      }
//    }
//
//    if( alreadyKnownMult == 0 )
//    {
//      pairTB infoSudoSurr( sudoNow, isClosedNow );
//
//      m_sudosClosed.push_back( infoSudoSurr );
//
//    }
//    else if( alreadyKnownMult > 1 )
//    {
//      UG_THROW("zu oft bekannt " << std::endl);
//      return false;
//    }
//
//    // check if now correct
//
//    T testKnownFine = 0;
//
//    for( auto const & suSu : m_sudosClosed )
//    {
//      T & sudoVal = suSu.first;
//      bool & isClosedVal = suSu.second;
//
//      if( sudoVal == sudoNow )
//      {
//        testKnownFine++;
//
//        if( isClosedVal != isClosedNow )
//        {
//          UG_THROW("NOT set property sudo surrounded, why?" << std::endl);
//          return false;
//        }
//
//      }
//    }
//
//    if( testKnownFine == 0 || testKnownFine > 1 )
//    {
//      UG_THROW("immer noch nicht bekannt?" << std::endl);
//      return false;
//
//    }
//
//    return true;
//  }
//
//  bool getIsAClosedFracture( T sudoNow )
//  {
//    T foundMultpl = 0;
//
//    bool isClosedReturn = false;
//
//    for( auto const & suSu : m_sudosClosed )
//    {
//      T const & sudoVal = suSu.first;
//      bool const & isClosedVal = suSu.second;
//
//      if( sudoVal == sudoNow )
//      {
//        foundMultpl++;
//        isClosedReturn = isClosedVal;
//      }
//    }
//
//    if( foundMultpl != 1 )
//    {
//      UG_THROW("not known status closed or not sudo" << std::endl);
//      return false;
//    }
//
//    return isClosedReturn;
//  }
//
//  bool setInfoAllFractureSudosIfClosed( VecPairTB const & sudosClosed )
//  {
//    m_sudosClosed = sudosClosed;
//
//    return true;
//  }
//
//  VecPairTB const getInfoAllFracSudosIfClosed() const
//  {
//    return m_sudosClosed;
//  }
//
//  // if all open or closed
//  template<bool B>
//  bool const getInfoAllFracturesSameClosedState() const
//  {
//    bool allFracsSame = true;
//
//    for( auto const & suSu : m_sudosClosed )
//    {
//      //T const & sudoVal = suSu.first;
//      bool const & isClosedVal = suSu.second;
//
//      if( isClosedVal != B )
//        allFracsSame = false;
//    }
//
//    return allFracsSame;
//  }
 
  // DEPRECATED; REMOVE
//  bool addAttachedFractElem( ATT_ELEM const & attElem )
//  {
//    bool alreadyKnown = false;
//
//    for( auto const & aE : m_vecAttElem )
//    {
//      if( aE.testIfEquals(attElem) )
//        alreadyKnown = true;
//    }
//
//    if( ! alreadyKnown )
//      m_vecAttElem.push_back(attElem);
//
//    // returns true if ads it, false if no need as known
//    return ! alreadyKnown;
//  }
 
//  std::vector<ATT_ELEM> const & getAllAttachedFractElems()
//  const
//  {
//    return m_vecAttElem;
//  }
 
private:
  bool m_isBndFracVertex;
  T m_numberCountedFracsInVertex;
 
  VrtxFracStatus m_status;
 
  static VrtxFracStatus constexpr m_maxStatus = VrtxFracStatus::threeFracSuDoAtt;
 
  std::vector<T> m_sudoList;
 
  // better private, to avoid confusion
  bool setVrtxFracStatus( VrtxFracStatus status )
  {
    m_status = status;
 
    if( status < noFracSuDoAtt || status > threeFracSuDoAtt )
      return false;
 
    return true;
  }
 
  bool adaptVrtxFracStatus()
  {
    auto sudosNum = m_sudoList.size();
    if( sudosNum > static_cast<T>( m_maxStatus ) )
    {
      UG_THROW("zu viele subdomains crossing in one Punkt" << std::endl);
      return false;
    }
 
    m_status = static_cast<VrtxFracStatus>(sudosNum);
 
    return true;
  }
 
//  VecPairTB m_sudosClosed;
 
  bool setSudoList( std::vector<T> const & sudoList )
  {
    m_sudoList = sudoList;
 
    return true;
  }
 
//  std::vector<ATT_ELEM> m_vecAttElem;
 
};
 
 
// intention, explained for volume:
template<
typename FULLDIM_ELEM,
typename MANIFELM,
typename LOWDIMELM,
typename INDEX_TXP,
typename NORMAL_VEC
>
class AttachedFullDimElemInfo
{
 
public:
 
  using AttachedFractManifElemInfo = AttachedFractElem<MANIFELM,LOWDIMELM,INDEX_TXP,NORMAL_VEC>;
  using AttachedGenerManifElemInfo = AttachedGeneralElem<MANIFELM,LOWDIMELM,INDEX_TXP>;
  using AttachedBndryManifElemInfo = AttachedBoundryElem<MANIFELM,LOWDIMELM,INDEX_TXP,NORMAL_VEC>;
 
  using VecAttachedFractManifElemInfo = std::vector<AttachedFractManifElemInfo>;
  using VecAttachedGenerManifElemInfo = std::vector<AttachedGenerManifElemInfo>;
  using VecAttachedBndryManifElemInfo = std::vector<AttachedBndryManifElemInfo>;
 
  using AttFullDimElmInfo = AttachedFullDimElemInfo<FULLDIM_ELEM,MANIFELM,LOWDIMELM,INDEX_TXP,NORMAL_VEC>;
 
  AttachedFullDimElemInfo( FULLDIM_ELEM const & fullDimElm )
  : m_fullDimElm(fullDimElm),
    m_elementMarked(false),
    m_vecFractManifElm(VecAttachedFractManifElemInfo()),
    m_vecUnclosedFractManifElm(VecAttachedFractManifElemInfo()),
//    m_vecFractManifElmTouchInfo(VecAttFractManifElmTouchInf()),
//    m_allSidesTouched(false),
    m_vecGenerManifElm(VecAttachedGenerManifElemInfo()),
    m_vecBndryManifElm(VecAttachedBndryManifElemInfo())
//    m_vecGenerManifElmTouchInfo(VecAttFractManifElmTouchInf())
//    m_vecInnerSegmentManifElm(VecAttachedGenerManifElemInfo())
  {
  }
 
  FULLDIM_ELEM const getFulldimElem() const
  {
    return m_fullDimElm;
  }
 
  bool const hasSameFulldimElem( AttFullDimElmInfo const & otherFullDimElmInf )
  const
  {
    FULLDIM_ELEM otherFullDimElm = otherFullDimElmInf.getFulldimElem();
 
    return ( otherFullDimElm == m_fullDimElm );
  }
 
  bool const isMarked() const { return m_elementMarked; }
 
  void markIt() { m_elementMarked = true; } // to allow in loop to be start element
 
  bool const hasFracture() const { return ( m_vecFractManifElm.size() > 0 ); }
 
  bool const hasUnclosedFracture() const { return ( m_vecUnclosedFractManifElm.size() > 0 ); }
 
  bool addFractManifElem( AttachedFractManifElemInfo const & manifFractElm, Grid & grid )
  {
    return addManifElem( manifFractElm, m_vecFractManifElm, grid );
  }
 
  bool addGenerManifElem( AttachedGenerManifElemInfo const & manifGenerElm, Grid & grid )
  {
//    static_assert(std::is_same<AttachedGenerManifElemInfo, decltype( manifGenerElm ) >::value);
 
    return addManifElem( manifGenerElm, m_vecGenerManifElm, grid );
  }
 
  bool addBndryManifElem( AttachedBndryManifElemInfo const & manifBndryElm, Grid & grid )
  {
    return addManifElem( manifBndryElm, m_vecBndryManifElm, grid );
  }
 
  // necessary to avoid stupid casting from derived class AttachedFractManifElemInfo
  // else, addGenerManifElem would also eat objects of derived class
  // however not it only accepts explicit base class objects
  template <typename NOGEN>
  bool addGenerManifElem( NOGEN const & noGener, Grid & grid )
  = delete;
 
  template <typename NOGEN>
  bool addBndryManifElem( NOGEN const & noGener, Grid & grid )
  = delete;
 
 
//  // will form new "surface" of next inner round in a segment
//  bool addInnerSegmentManifElem( AttachedGenerManifElemInfo const & manifInnerSegmentElm, Grid & grid )
//  {
//    return addManifElem( manifInnerSegmentElm, m_vecInnerSegmentManifElm, grid );
//  }
//
//  template <typename NOGEN>
//  bool addInnerSegmentElem( NOGEN const & noGener, Grid & grid )
//  = delete;
 
 
 
//  bool addFractureManifElem( AttachedFractManifElemInfo const & manifElm, Grid & grid )
//  {
//    // Caution: first test if manifold elem is at all part of the fulldim elem manifols
//    // if not, return false directly
//
//    if( ! fullDimElmContainsManif( manifElm.getManifElm(), grid ) )
//      return false;
//
//    // if manif elem is in principle part of the fulldim elem manifolds,
//    // then we need to check if it is already integrated
//
//    bool hasElemAlready = false;
//
//
//    for( auto const & me : m_vecFractManifElm )
//    {
//      if( manifElm.testIfEquals(me) )
//      {
//        hasElemAlready = true;
//        break;
//      }
//    }
//
//    if( ! hasElemAlready )
//    {
//      m_vecFractManifElm.push_back( manifElm );
//
//    }
//
//    return ! hasElemAlready;
//  }
 
  VecAttachedFractManifElemInfo const getVecFractManifElem() const
  {
    return m_vecFractManifElm;
  }
 
  VecAttachedFractManifElemInfo const getVecUnclosedFractManifElem() const
  {
    return m_vecUnclosedFractManifElm;
  }
 
 
  VecAttachedGenerManifElemInfo const getVecGenerManifElem() const
  {
    return m_vecGenerManifElm;
  }
 
  VecAttachedBndryManifElemInfo const getVecBndryManifElem() const
  {
    return m_vecBndryManifElm;
  }
 
 
  bool const searchGenerManifElem( AttachedGenerManifElemInfo const & manifGenerElemOther, bool eraseFound = true )
  {
    bool found = searchManifElem( manifGenerElemOther, m_vecGenerManifElm, eraseFound );
 
    if( found && eraseFound )
    {
      m_elementMarked = true;
    }
 
    return found;
  }
 
  bool const testFullDimElmNeighbour( AttFullDimElmInfo const & attFullDimElmInfOther, bool eraseFoundManif = true )
  {
    VecAttachedGenerManifElemInfo const & vecGenerManifElmOther = attFullDimElmInfOther.getVecGenerManifElem();
 
    bool manifNeighbored = false;
 
    for( AttachedGenerManifElemInfo const & generManifElemOther : vecGenerManifElmOther )
    {
      if( searchManifElem( generManifElemOther, m_vecGenerManifElm, eraseFoundManif ) )
        manifNeighbored = true;
 
    }
 
    if( manifNeighbored && eraseFoundManif )
    {
      m_elementMarked = true;
    }
 
    return manifNeighbored;
  }
 
 
  template <typename NOGEN>
  bool searchGenerManifElem( NOGEN const & manifGenerElemOther, bool eraseFound ) = delete;
 
//  bool const searchFractManifElem( AttachedFractManifElemInfo const & manifFractElemOther, bool eraseFound = true )
  bool const searchFractManifElem( AttachedFractManifElemInfo const & manifFractElemOther, bool shiftToUnclosedFracts = true )
  {
    bool found = searchManifElem( manifFractElemOther, m_vecFractManifElm, shiftToUnclosedFracts );
 
    if( found && shiftToUnclosedFracts )
    {
      // for the case that a fracture is not closed at a vertex, shift the in principle
      // fracture vertex to the gerneral vertices, as useless for segmente construction
      // and useless for expansion
 
      m_vecUnclosedFractManifElm.push_back(manifFractElemOther);
 
 
//      MANIFELM const & manifel = manifFractElemOther.getManifElm();
//      typename AttachedGenerManifElemInfo::PairLowEl const & pairLowEl = manifFractElemOther.getPairLowElm();
//
//      AttachedGenerManifElemInfo agmei( manifel, pairLowEl );
 
//      m_vecUnclosedFractManifElm.push_back(agmei);
    }
 
    return found;
 
  }
 
  template <typename NOGEN>
  bool const searchFractManifElem( NOGEN const & manifFractElemOther, bool shiftToGeneral ) = delete;
 
  bool const searchBndryManifElem( AttachedBndryManifElemInfo const & manifBndryElemOther )
  {
    return searchManifElem( manifBndryElemOther, m_vecBndryManifElm, false );
  }
 
//  bool const searchInnerSegmentManifElem( AttachedGenerManifElemInfo const & manifInnerSegmElemOther, bool eraseFound = true )
//  {
//    return searchManifElem( manifInnerSegmElemOther, m_vecInnerSegmentManifElm, eraseFound );
//  }
 
//  bool const tryToTouchManifElem( AttachedFractManifElemInfo const & manifElemOther ) const
//  {
//
//    for( typename VecAttachedFractManifElemInfo::iterator afeiIter  = m_vecFractManifElm.begin();
//                           afeiIter != m_vecFractManifElm.end();
//                           afeiIter++
//    )
//    {
//      AttachedFractManifElemInfo & manifElmTest = *afeiIter;
//
//      if( manifElemOther.testIfEquals(manifElmTest) )
//      {
//        managed2Touch = true;
//
//        m_vecFractManifElm.erase(afeiIter);
//
//        return true;
//      }
//    }
//
//    return false;
//
//
//
//    return managed2Touch;
//  }
 
//  VecAttachedFractManifElemInfo const getAlreadyTouchedManifElems() const
//  {
//    VecAttachedFractManifElemInfo alreadyTouchedManifElms;
//
//    for( const auto & ameti : m_vecFractManifElmTouchInfo )
//    {
//      if( ameti.second )
//        alreadyTouchedManifElms.push_back( ameti );
//    }
//
//    return alreadyTouchedManifElms;
//  }
 
//  VecAttachedFractManifElemInfo const getSoFarUnTouchedManifElems() const
//  {
//    VecAttachedFractManifElemInfo unTouchedManifElms;
//
//    for( const auto & ameti : m_vecFractManifElmTouchInfo )
//    {
//      if( ! ameti.second )
//        unTouchedManifElms.push_back( ameti );
//    }
//
//    return unTouchedManifElms;
//  }
 
//  bool const testIfAllSidesTouched() const
//  {
//    if( m_allSidesTouched )
//      return true;
//
//    bool allSidesTouched = true;
//
//    for( const auto & ameti : m_vecFractManifElmTouchInfo )
//    {
//      if( ! ameti.second )
//      {
//        allSidesTouched = false;
//      }
//    }
//
//    m_allSidesTouched = allSidesTouched;
//
//    return m_allSidesTouched;
//  }
 
private:
 
//  bool m_allSidesTouched;
 
  FULLDIM_ELEM m_fullDimElm;
 
  bool m_elementMarked;
 
  VecAttachedFractManifElemInfo m_vecFractManifElm;
 
  VecAttachedFractManifElemInfo m_vecUnclosedFractManifElm;
 
 
//  using AttFractManifElmTouchInf = std::pair<AttachedFractManifElemInfo,bool>;
//  using VecAttFractManifElmTouchInf = std::vector<AttFractManifElmTouchInf>;
//
//  VecAttFractManifElmTouchInf m_vecFractManifElmTouchInfo;
 
  VecAttachedGenerManifElemInfo m_vecGenerManifElm;
 
  VecAttachedBndryManifElemInfo m_vecBndryManifElm;
 
//  VecAttachedGenerManifElemInfo m_vecInnerSegmentManifElm;
 
//  using AttGenerManifElmTouchInf = std::pair<AttachedGenerManifElemInfo,bool>;
//  using VecAttGenerManifElmTouchInf = std::vector<AttGenerManifElmTouchInf>;
//
//  VecAttFractManifElmTouchInf m_vecGenerManifElmTouchInfo;
 
 
//    template<
//  typename std::enable_if<std::is_same<MANIFELM,Face* const &>::value,bool>
//  >
  //std::enable_if<std::is_same<MANIFELM,Face* const &>::value>
  template
  <
  typename = std::enable_if<std::is_same<Volume*,FULLDIM_ELEM>::value>,
  typename = std::enable_if<std::is_same<Face*,MANIFELM>::value>
//  typename = std::enable_if<std::is_same<Volume* const &,FULLDIM_ELEM>::value>,
//  typename = std::enable_if<std::is_same<Face* const &,MANIFELM>::value>
  >
  bool fullDimElmContainsManif( MANIFELM const & manifEl, Grid & grid )
  {
//    bool contained = false;
 
    for( INDEX_TXP iFac = 0; iFac < m_fullDimElm->num_faces(); iFac++ )
    {
 
//      static_assert(std::is_same<decltype(m_fullDimElm), Volume *>::value);
 
      Face * fac = grid.get_face(m_fullDimElm,iFac);
 
      if( fac == manifEl )
      {
        return true;
//        contained = true;
//        break;
      }
    }
 
//    return contained;
    return false;
  }
 
 
  template <typename ATT_MANIF_ELM_INF >
  bool const searchManifElem( ATT_MANIF_ELM_INF const & manifElemOther,
                std::vector<ATT_MANIF_ELM_INF> & memVecManifElem,
                bool eraseFound = true )
  const
  {
 
    for( typename std::vector<ATT_MANIF_ELM_INF>::iterator afeiIter  = memVecManifElem.begin();
                                 afeiIter != memVecManifElem.end();
                                 afeiIter++
    )
    {
      ATT_MANIF_ELM_INF & manifElmTest = *afeiIter;
 
      if( manifElemOther.testIfEquals(manifElmTest) )
      {
 
        if( eraseFound )
          memVecManifElem.erase(afeiIter);
 
        return true;
      }
    }
 
    return false;
  }
 
 
 
  template <typename ATT_MANIF_ELM_INFO >
  bool addManifElem( ATT_MANIF_ELM_INFO const & manifElm,
             std::vector<ATT_MANIF_ELM_INFO> & memVecManifElm,
             Grid & grid )
  {
    // Caution: first test if manifold elem is at all part of the fulldim elem manifols
    // if not, return false directly
 
    if( ! fullDimElmContainsManif( manifElm.getManifElm(), grid ) )
      return false;
 
    // if manif elem is in principle part of the fulldim elem manifolds,
    // then we need to check if it is already integrated
 
    for( auto const & me : memVecManifElm )
    {
      if( manifElm.testIfEquals(me) )
      {
        return false;
      }
    }
 
    // not contained so far, but part of the manifolds of the fulldim elem
    memVecManifElm.push_back(manifElm);
 
    return true;
 
  }
 
 
};
 
 
 
// Ebenentyp: a x1 + b x2 + c x3 = rhs, normal * ( vecX - baseVect ) = 0
template<typename VECTOR_TYP,
     typename LOWDIMELM
>
class ManifoldDescriptor
{
public:
 
  enum ManifoldType { isFracture, isBoundary, isArtificial };
 
  template<typename = std::enable_if<std::is_same<VECTOR_TYP,vector3>::value>>
//      ManifoldDescriptor( int sudo = -1, number scaleShiftNormal = 0 )
  ManifoldDescriptor()
  : m_normalVect(vector3()),
    m_baseVect(vector3()),
    m_rhs(0),
    m_scaleShiftNormal(0),
    m_dim(3),
    m_sudo(-1),
    m_manifTyp( isArtificial )
  {
  }
 
 
  template<typename = std::enable_if<std::is_same<VECTOR_TYP,vector3>::value>>
  ManifoldDescriptor( VECTOR_TYP const & normalVect,
            VECTOR_TYP const & baseVect,
            int sudo = -1,
            ManifoldType manifTyp = isArtificial,
            number scaleShiftNormal = 0
            )
  : m_normalVect(normalVect),
    m_baseVect(baseVect),
    m_scaleShiftNormal(scaleShiftNormal),
    m_dim(3),
    m_sudo(sudo),
    m_manifTyp( manifTyp ),
    m_lowDimElms(std::vector<LOWDIMELM>())
  {
    m_rhs = 0;
 
    UG_LOG("Ebenenkoordinatenform ");
 
    for( int i = 0; i < m_dim; i++ )
    {
      m_rhs += normalVect[i]*baseVect[i];
 
      UG_LOG( " + " << normalVect[i] << " x_" << i << " " );
    }
 
    UG_LOG(" = " << m_rhs << std::endl);
 
  }
 
  VECTOR_TYP const & spuckNormalVector() const { return m_normalVect; }
  VECTOR_TYP const & spuckBaseVector() const { return m_baseVect; }
 
  int const spuckSudo() const { return m_sudo; }
 
  ManifoldType const spuckManifTyp() const { return m_manifTyp; }
 
  number const spuckScaleShiftNormal() const { return m_scaleShiftNormal; }
 
  void schluckSudo( int sudo ) { m_sudo = sudo; }
 
  void schluckManifTyp( ManifoldType manifTyp )  { m_manifTyp = manifTyp; }
 
  void schluckScaleShiftNormal( number scaleShiftNormal )
  {
    m_scaleShiftNormal = scaleShiftNormal;
  }
 
  number const & spuckRHS() const { return m_rhs; }
 
  template<typename = std::enable_if<    std::is_same<VECTOR_TYP,vector3>::value
//                    || std::is_same<VECTOR_TYP,vector2>::value>
                  >
  >
  bool spuckPlaneShiftedAlong( VECTOR_TYP const & shiftVec, ManifoldDescriptor & manifoldDescr )
  {
    VECTOR_TYP shiftedBaseVect;
//    number rhsShiftedPlane = 0;
 
    VecAdd( shiftedBaseVect, m_baseVect, shiftVec );
 
    UG_LOG("Ebenenkoordinatenform Shifted Plane " << std::endl);
 
//    ManifoldDescriptor( VECTOR_TYP const & normalVect,
//              VECTOR_TYP const & baseVect,
//              int sudo = -1,
//              ManifoldType = isArtificial,
//              number scaleShiftNormal = 0
//              )
 
    manifoldDescr = ManifoldDescriptor( m_normalVect, shiftedBaseVect, m_sudo, m_manifTyp, 0 );
 
    return true;
 
  }
 
  template<typename = std::enable_if<std::is_same<VECTOR_TYP,vector3>::value >>
  bool spuckPlaneShifted( ManifoldDescriptor & manifoldDescr )
  {
 
    UG_LOG("Ebenenkoordinatenform Shifted Plane " << std::endl);
 
    manifoldDescr = ManifoldDescriptor( m_normalVect, spuckShiftedBaseVect(), m_sudo, m_manifTyp, 0 );
 
    if( ! manifoldDescr.schluckLowDimElms(m_lowDimElms) )
    {
      UG_LOG("Neuer Manifold Descripter verschoben ohne Ecken" << std::endl);
    }
 
    return true;
 
  }
 
 
  template<typename = std::enable_if< std::is_same<VECTOR_TYP,vector3>::value>>
  VECTOR_TYP spuckShiftedBaseVect()
  {
    VECTOR_TYP shiftVec;
 
    VecScale(shiftVec, m_normalVect, m_scaleShiftNormal );
 
    VECTOR_TYP shiftedBaseVec;
 
    VecAdd( shiftedBaseVec, m_baseVect, shiftVec );
 
    return shiftedBaseVec;
  }
 
  bool schluckLowDimElms( std::vector<LOWDIMELM> const & lowDimElms )
  {
    m_lowDimElms = lowDimElms;
    return ( m_lowDimElms.size() > 0 );
  }
 
  bool const spuckLowDimElms( std::vector<LOWDIMELM> & lowDimElms ) const
  {
    lowDimElms = m_lowDimElms;
    return ( m_lowDimElms.size() > 0 );
  }
 
private:
 
  VECTOR_TYP m_normalVect;
  VECTOR_TYP m_baseVect;
  number m_rhs;
  number m_scaleShiftNormal;
 
  // could be defined as static const variable, but then depending on the template parameter
  // might be an idea for future, but no real use, but would be "nice" from the meta programmig point of view
  int m_dim;
  int m_sudo;
  ManifoldType m_manifTyp;
 
  std::vector<LOWDIMELM> m_lowDimElms;
};
 
 
 
//template
//<
//typename FULLDIMEL,
//typename MANIFEL,
//typename LOWDIMEL,
//typename VRTXTYP,
//typename INDEXTYP
//>
//class EndingCrossingFractSegmentInfo;
 
 
 
template <
typename FULLDIM_ELEM,
typename MANIFELM,
typename LOWDIMELM,
typename INDEX_TXP,
typename VECTOR_TYP,
typename VRTXTYP
>
class SegmentSides
{
public:
 
  enum VrtxFracStatus { noFracSuDoAtt = 0,
              oneFracSuDoAtt = 1,
              twoFracSuDoAtt = 2,
              threeFracSuDoAtt = 3 };
 
  using AttFractElm = AttachedFractElem<MANIFELM, LOWDIMELM, INDEX_TXP, VECTOR_TYP>;
  using AttBndryElm = AttachedBoundryElem<MANIFELM, LOWDIMELM, INDEX_TXP, VECTOR_TYP>;
 
  using VecAttFractElm = std::vector<AttFractElm>;
  using VecAttBndryElm = std::vector<AttBndryElm>;
 
  using PairSudoNormlV = std::pair<INDEX_TXP,VECTOR_TYP>;
  using VecPairSudoNormlV = std::vector<PairSudoNormlV>;
 
  using PairSudoVecLowDiEl = std::pair<INDEX_TXP, std::vector<LOWDIMELM> >;
  using VecPairSudoVecLowDiEl = std::vector<PairSudoVecLowDiEl>;
 
  using ManifDescr = ManifoldDescriptor<VECTOR_TYP, LOWDIMELM>;
  using VecManifDescr = std::vector<ManifDescr>;
 
  // TODO FIXME das soll gleich durch den Manifold Descriptor ersetzt werden
  // oder eine Basisklasse von ihm, die nicht so viele Infos enthält
  // aber mindestens NormalenVektor, Sudo, und ob Boundary oder Fracture
  // kann auch vielleicht einfach eine Klasse sein, die noch einen Parameter enthält
  // der sich abfragen lässt, auch als Template vielleicht, true false, fracture or not
  // also was wie template < index, normal, bool > pairsudonormlbla, oder sowas.....
  // oder man kann einen Parameter setzen für diese Klasse, die extern definiert wird......
  // bool isFracture true false.....
 
  template<   typename = std::enable_if< std::is_pointer<LOWDIMELM>::value>
      >
  SegmentSides( VRTXTYP const & vrt, bool isBndry = false )
  : m_vrt(vrt),
    m_shiftDirectionIfUnclosedFractPresent(nullptr),
    m_vecAttFractElms(VecAttFractElm()),
    m_vecAttUnclosedFractElms(VecAttFractElm()),
    m_vecAttBndryElms(VecAttBndryElm()),
    m_vecFractSudosNormlV(VecPairSudoNormlV()),
    m_vecBndrySudosNormlV(VecPairSudoNormlV()),
    m_vecFractSudoLowDiEl(VecPairSudoVecLowDiEl()),
    m_vecBndrySudoLowDiEl(VecPairSudoVecLowDiEl()),
    m_isBoundary(isBndry),
    m_averaged(false),
    m_contribFulldimElm(std::vector<FULLDIM_ELEM>()),
    m_volEdgesDetermined(false),
    m_vecVolEdges(std::vector<LOWDIMELM>())
  {};
 
//  template<typename = std::enable_if< std::is_pointer<VRTXTYP>::value>>
//  SegmentSides()
//  : m_vrt(nullptr),
//    m_vecAttFractElms(VecAttFractElm()),
//    m_vecAttUnclosedFractElms(VecAttFractElm()),
//    m_vecAttBndryElms(VecAttBndryElm()),
//    m_vecFractSudosNormlV(VecPairSudoNormlV()),
//    m_vecBndrySudosNormlV(VecPairSudoNormlV()),
//    m_isBoundary(false),
//    m_averaged(false),
//    m_contribFulldimElm(std::vector<FULLDIM_ELEM>())
//  {};
 
 
  bool const isBoundary() const { return m_isBoundary; }
 
  VRTXTYP const spuckVertex() const
  {
    return m_vrt;
  }
 
  bool schluckFulldimElem( FULLDIM_ELEM const & fudielm )
  {
    m_volEdgesDetermined = false;
    return addElem(m_contribFulldimElm, fudielm);
//    m_contribFulldimElm.push_back(fudielm);
  }
 
  bool const spuckVecFulldimElem( std::vector<FULLDIM_ELEM> & fudielm ) const
  {
    fudielm = m_contribFulldimElm;
 
    return ( m_contribFulldimElm.size() != 0 );
  }
 
  template< //typename GRID,
        //typename = std::enable_if< std::is_same<GRID, Grid >::value>,
        typename = std::enable_if< std::is_same<FULLDIM_ELEM,Volume*>::value>,
        typename = std::enable_if< std::is_same<FULLDIM_ELEM,Volume*>::value>
      >
  bool spuckListLowdimElmsOfVols( std::vector<LOWDIMELM> & listLowdimElms, Grid & grid )
  {
    if( ! m_volEdgesDetermined )
    {
      determineListLowdimElms( grid );
    }
 
    listLowdimElms = m_vecVolEdges;
 
    return m_volEdgesDetermined;
  }
 
 
  VrtxFracStatus const spuckCrossingTyp() const
  {
    VrtxFracStatus vfsFract =  static_cast<VrtxFracStatus>(m_vecFractSudosNormlV.size());
 
    if( m_isBoundary )
    {
      VrtxFracStatus vfsBndry = static_cast<VrtxFracStatus>(m_vecBndrySudosNormlV.size());
 
      return static_cast<VrtxFracStatus>( static_cast<INDEX_TXP>(vfsFract) + static_cast<INDEX_TXP>(vfsBndry) );
    }
 
    return vfsFract;
  }
 
  bool schluckVecAttFractElm( std::vector<AttFractElm> const & vecAtFracEl )
  {
    return schluckVecAttElm( vecAtFracEl, m_vecAttFractElms );
  }
 
  template< typename NOFRACT >
  bool schluckVecAttFractElm( std::vector<NOFRACT> const & vecAtFracEl ) = delete;
 
  bool schluckAttFractElm( AttFractElm const & afeNew )
  {
    return schluckAttElm( afeNew, m_vecAttFractElms );
 
//    if( ! isStillUnknown( afeNew, m_vecAttFractElms ) )
//    {
//      return false;
//    }
//
//    m_vecAttFractElms.push_back(afeNew);
//
//    return true;
  }
 
  template< typename NOFRACT >
  bool schluckAttFractElm( NOFRACT const & afeNew ) = delete;
 
  // soll auch in der Lage sein, die einzenlen Fracture faces wieder aus zu spucken als Liste
  // analog auch dan  ach die boundary Geschichten
  bool const spuckVecAttFractElm( std::vector<AttFractElm> & vecAttFracEl ) const
  {
    vecAttFracEl = m_vecAttFractElms;
    return true;
  }
 
  bool schluckVecAttBndryElm( std::vector<AttBndryElm> const & vecAtBndryEl )
  {
//    if( ! checkIfIsAtBndry() )
//      return false;
 
    return schluckVecAttElm( vecAtBndryEl, m_vecAttBndryElms );
  }
 
  bool schluckAttBndryElm( AttBndryElm const & afeNew )
  {
//    if( ! checkIfIsAtBndry() )
//      return false;
 
    return schluckAttElm( afeNew, m_vecAttBndryElms );
 
//    if( ! isStillUnknown( afeNew, m_vecAttBndryElms ) )
//    {
//      return false;
//    }
//
//    m_vecAttBndryElms.push_back(afeNew);
//
//    return true;
  }
 
  bool spuckVecAttBndryElm( std::vector<AttBndryElm> & vecAtBndryEl )
  {
    vecAtBndryEl = m_vecAttBndryElms;
    return true;
  }
 
 
  bool schluckVecAttUnclosedFractElm( std::vector<AttFractElm> const & vecAtFracEl )
  {
    return schluckVecAttElm( vecAtFracEl, m_vecAttUnclosedFractElms, true );
  }
 
  template< typename NOFRACT >
  bool schluckVecAttUnclosedFractElm( std::vector<NOFRACT> const & vecAtFracEl ) = delete;
 
  bool schluckAttUnclosedFractElm( AttFractElm const & afeNew )
  {
    return schluckAttElm( afeNew, m_vecAttUnclosedFractElms, true );
  }
 
  template< typename NOFRACT >
  bool schluckAttUnclosedFractElm( NOFRACT const & afeNew ) = delete;
 
  bool const spuckVecAttUnclosedFractElm( std::vector<AttFractElm> & vecAttFracEl ) const
  {
    vecAttFracEl = m_vecAttUnclosedFractElms;
    return true;
  }
 
  bool const hasUnclosedFaces() const
  {
    return ( m_vecAttUnclosedFractElms.size() > 0 );
  }
 
  template<   typename = std::enable_if< std::is_pointer<LOWDIMELM>::value>
      >
  bool schluckLowdimElmShiftDirectionIfUnclosedFractPresent( LOWDIMELM const & shiftDirectionElm )
  {
    if(    m_shiftDirectionIfUnclosedFractPresent != nullptr
      && shiftDirectionElm != m_shiftDirectionIfUnclosedFractPresent
      )
    {
      UG_LOG("Shift direction already set different " << std::endl);
      UG_THROW("Shift direction already set different " << std::endl);
    }
 
    if( shiftDirectionElm != nullptr )
    {
      m_shiftDirectionIfUnclosedFractPresent = shiftDirectionElm;
      return true;
    }
 
    return false;
  }
 
  template<   typename = std::enable_if< std::is_pointer<LOWDIMELM>::value>
      >
  bool const spuckLowdimElmShiftDirectionIfUnclosedFractPresent( LOWDIMELM & shiftDirectionElm ) const
  {
    if( m_shiftDirectionIfUnclosedFractPresent != nullptr )
    {
      shiftDirectionElm = m_shiftDirectionIfUnclosedFractPresent;
      return true;
    }
 
    return false;
  }
 
  bool averageAll()
  {
    if( m_isBoundary )
    {
      if( ! averageBndryNormals() )
        return false;
    }
 
    if( ! averageFractNormals() )
      return false;
 
    m_averaged = true;
 
    return m_averaged;
  }
 
  bool const spuckFractSudoNormls( VecPairSudoNormlV & vecFractSudosNormlV ) const
  {
    if( ! m_averaged )
    {
      UG_LOG("please average " << std::endl);
      UG_THROW("please average " << std::endl);
      return false;
    }
 
    vecFractSudosNormlV = m_vecFractSudosNormlV;
 
    return true;
  }
 
  template<typename = std::enable_if< std::is_same<VECTOR_TYP,vector3>::value>>
  bool const spuckFractManifDescr( VecManifDescr & vecManifDesc,
                   Grid::VertexAttachmentAccessor<APosition> const & aaPos,
                   bool clearDescVec = true
  ) const
  {
    return spuckManifDescr<ManifDescr::ManifoldType::isFracture>( vecManifDesc, aaPos, m_vecFractSudosNormlV, m_vecFractSudoLowDiEl, clearDescVec );
//    return spuckManifDescr<0>( vecManifDesc, aaPos, m_vecFractSudosNormlV );
  }
 
 
 
 
//  bool spuckFractManifDescr( VecManifDescr & vecManifDesc, Grid::VertexAttachmentAccessor<APosition> const & aaPos )
//  {
//    if( ! m_averaged )
//    {
//      UG_LOG("please average " << std::endl);
//      UG_THROW("please average " << std::endl);
//      return false;
//    }
//
//    VecPairSudoNormlV const & vecFractSudosNormlV = m_vecFractSudosNormlV;
//
//    vecManifDesc.clear();
//
//    for( PairSudoNormlV const & psn : vecFractSudosNormlV )
//    {
//      VECTOR_TYP posVrt = aaPos[m_vrt];
//
//      int sudo = psn.first;
//      VECTOR_TYP normlVec = psn.second;
//
//
//      ManifDescr manifDesc( normlVec, posVrt, sudo, ManifDescr::ManifoldType::isFracture );
//
//      vecManifDesc.push_back( manifDesc );
//    }
//
//    return true;
//  }
 
  bool spuckBndrySudoNormls( VecPairSudoNormlV & vecBndrySudosNormlV )
  {
//    if( ! checkIfIsAtBndry() )
//      return false;
 
    if( ! m_averaged )
    {
      UG_LOG("please average " << std::endl);
      UG_THROW("please average " << std::endl);
      return false;
    }
 
    vecBndrySudosNormlV = m_vecBndrySudosNormlV;
 
    return true;
  }
 
  template<typename = std::enable_if< std::is_same<VECTOR_TYP,vector3>::value>>
  bool const spuckBndryManifDescr( VecManifDescr & vecManifDesc,
                   Grid::VertexAttachmentAccessor<APosition> const & aaPos,
                   bool clearDescVec = true
  ) const
  {
    return spuckManifDescr<ManifDescr::ManifoldType::isBoundary>( vecManifDesc, aaPos, m_vecBndrySudosNormlV, m_vecBndrySudoLowDiEl, clearDescVec );
    //    return spuckManifDescr<2>( vecManifDesc, aaPos, m_vecFractSudosNormlV );
  }
 
 
private:
 
  VRTXTYP m_vrt;
 
  LOWDIMELM m_shiftDirectionIfUnclosedFractPresent;
 
  VecAttFractElm m_vecAttFractElms;
  VecAttFractElm m_vecAttUnclosedFractElms;
 
  VecAttBndryElm m_vecAttBndryElms;
 
 
 
  VecPairSudoNormlV m_vecFractSudosNormlV;
  VecPairSudoNormlV m_vecBndrySudosNormlV;
 
  VecPairSudoVecLowDiEl m_vecFractSudoLowDiEl;
  VecPairSudoVecLowDiEl m_vecBndrySudoLowDiEl;
 
 
  bool m_isBoundary;
  bool m_averaged;
 
  std::vector<FULLDIM_ELEM> m_contribFulldimElm;
 
  bool m_volEdgesDetermined;
  std::vector<LOWDIMELM> m_vecVolEdges;
 
  // zu heikel, weil dabei Änderungen nicht übernommen würden, es sei denn, es wäre pointer, aber die
  // wollen wir auch vermeiden
//  EndingCrossingFractSegmentInfo<FULLDIM_ELEM, MANIFELM, LOWDIMELM, VRTXTYP, INDEX_TXP> m_endingCrossFractSegmInf;
 
  template <typename ATT_ELM, typename VEC_ATT_ELM,
        typename = std::enable_if<std::is_same<std::vector<ATT_ELM>,VEC_ATT_ELM>::value>,
        typename  = std::enable_if<std::is_base_of<AttFractElm,ATT_ELM>::value>
      >
  bool isStillUnknown( ATT_ELM const & afeNew, VEC_ATT_ELM const & vecAttELm, bool acceptUnknowns = false )
  {
    for( ATT_ELM const & afeAlt : vecAttELm )
    {
      if( afeAlt.testIfEquals(afeNew) )
      {
        UG_LOG("Strange, already known?" << std::endl);
        if( ! acceptUnknowns )
          UG_THROW("Strange, already known?" << std::endl);
        return false;
      }
    }
 
    return true;
 
  }
 
  template <typename ATT_ELM,
        typename = std::enable_if<std::is_base_of<AttFractElm,ATT_ELM>::value>
      >
  bool extractSudoList( std::vector<INDEX_TXP> & sudoListSegment, std::vector<ATT_ELM> const & vecAttELm )
  {
    for( AttFractElm const & me : vecAttELm )
    {
      INDEX_TXP sudoNeeded = me.getSudo();
 
      bool sudoIsKnown = false;
 
      for( INDEX_TXP sudoInList : sudoListSegment )
      {
        if( sudoInList == sudoNeeded )
        {
          sudoIsKnown = true;
          break;
        }
      }
 
      if( ! sudoIsKnown )
        sudoListSegment.push_back(sudoNeeded);
    }
 
    return true;
  }
 
  template <typename ATT_ELM,
        typename = std::enable_if<std::is_base_of<AttFractElm,ATT_ELM>::value>
      >
  bool averageNormlForEachSudo( std::vector<ATT_ELM> const & vecAttElm, VecPairSudoNormlV & vecPSudoNrml, VecPairSudoVecLowDiEl & vecPSudoVecLowDiElm )
  {
    // first determine appearing sudos
 
    std::vector<INDEX_TXP> sudoListSegment;
 
    extractSudoList(sudoListSegment,vecAttElm);
 
    for( INDEX_TXP sudo : sudoListSegment )
    {
      VECTOR_TYP normlAvrg;
 
      if( ! averageNormalForSpecificSudo( sudo, vecAttElm, normlAvrg ) )
        return false;
 
      std::pair<INDEX_TXP, VECTOR_TYP> sudoNorml( sudo, normlAvrg );
 
      vecPSudoNrml.push_back(sudoNorml);
 
      // TODO FIXME auch Liste mit Sudo plus Ecken, die auf der Mannigfaltigkeit liegen!!!!
 
      std::vector<LOWDIMELM> vecLowDimElmsSudo;
 
      if( ! extractLowDimElemsForSpecificSudo( sudo, vecAttElm, vecLowDimElmsSudo ) )
        return false;
 
      PairSudoVecLowDiEl sudoLDE( sudo, vecLowDimElmsSudo );
 
      vecPSudoVecLowDiElm.push_back( sudoLDE );
 
    }
 
    return true;
  }
 
  template <typename ATT_ELM,
        typename = std::enable_if<std::is_base_of<AttFractElm,ATT_ELM>::value>
      >
  bool averageNormalForSpecificSudo( INDEX_TXP specfcSudo, std::vector<ATT_ELM> const & vecAttElm, VECTOR_TYP & normlAvrg )
  {
    VECTOR_TYP normsSum(0,0,0);
    INDEX_TXP numContrNrmls = 0;
 
    for( ATT_ELM const & ae : vecAttElm )
    {
      INDEX_TXP sudoElm = ae.getSudo();
 
      if( specfcSudo == sudoElm )
      {
        VECTOR_TYP normElm = ae.getNormalVec();
 
        VECTOR_TYP tmpSum = normsSum;
 
        VecAdd( normsSum, normElm, tmpSum );
 
        numContrNrmls++;
      }
    }
 
    if( numContrNrmls == 0 )
    {
      UG_LOG("Kein Beitrag in SUdo? " << std::endl);
      UG_THROW("Kein Beitrag in SUdo? " << std::endl);
      return false;
    }
 
    VecScale( normlAvrg, normsSum, 1. / static_cast<number>(numContrNrmls) );
 
    return true;
 
  }
 
  template <typename ATT_ELM,
        typename = std::enable_if<std::is_base_of<AttFractElm,ATT_ELM>::value>
      >
  bool extractLowDimElemsForSpecificSudo( INDEX_TXP specfcSudo, std::vector<ATT_ELM> const & vecAttElm, std::vector<LOWDIMELM> & vecLowDimElms )
  {
    for( ATT_ELM const & ae : vecAttElm )
    {
      INDEX_TXP sudoElm = ae.getSudo();
 
      if( specfcSudo == sudoElm )
      {
        std::pair<LOWDIMELM,LOWDIMELM> paLoDiEl = ae.getPairLowElm();
 
        addElem(vecLowDimElms, paLoDiEl.first);
        addElem(vecLowDimElms, paLoDiEl.second);
      }
 
    }
 
    return true;
  }
 
 
  bool averageFractNormals()
  {
    return averageNormlForEachSudo( m_vecAttFractElms, m_vecFractSudosNormlV, m_vecFractSudoLowDiEl );
  }
 
  bool averageBndryNormals()
  {
    if( m_isBoundary )
    {
      return averageNormlForEachSudo( m_vecAttBndryElms, m_vecBndrySudosNormlV, m_vecBndrySudoLowDiEl );
    }
    else
    {
      UG_LOG("no boundary, no averaging");
      return false;
    }
  }
 
  template
  < typename ATT_ELM,
    typename = std::enable_if<std::is_base_of<AttFractElm,ATT_ELM>::value>
  >
  bool schluckVecAttElm( std::vector<ATT_ELM> const & vecAttElNew, std::vector<ATT_ELM> & vecAttElmKnown, bool acceptUnknowns = false )
  {
    bool allUnknown = true;
 
    for( ATT_ELM const & aeN : vecAttElNew )
    {
      if( ! schluckAttElm( aeN, vecAttElmKnown, acceptUnknowns ) )
      {
        allUnknown = false;
        UG_LOG("ist schon bekannt" << std::endl);
        if( ! acceptUnknowns)
          UG_THROW("ist schon bekannt" << std::endl);
        //return false;
      }
    }
 
    return allUnknown;
  }
 
  template
  < typename ATT_ELM,
    typename = std::enable_if<std::is_base_of<AttFractElm,ATT_ELM>::value>
  >
  bool schluckAttElm( ATT_ELM const & attElNew, std::vector<ATT_ELM> & vecAttElmKnown, bool acceptUnknowns = false )
  {
    m_averaged = false;
 
    if( ! isStillUnknown( attElNew, vecAttElmKnown, acceptUnknowns ) )
    {
      UG_LOG("ist schon bekannt" << std::endl);
      if( ! acceptUnknowns )
        UG_THROW("ist schon bekannt" << std::endl);
      return false;
    }
 
    vecAttElmKnown.push_back(attElNew);
 
    return true;
  }
 
  bool checkIfIsAtBndry()
  {
    if( ! m_isBoundary )
    {
      UG_LOG("gibts keine Bndry " << std::endl);
      UG_THROW("gibts keine Bndry " << std::endl);
      return false;
    }
 
    return m_isBoundary;
  }
 
//  template<ManifDescr::ManifoldType manifTyp,
//  template<typename ManifDescr::ManifoldType manifTyp,
  template<typename ManifDescr::ManifoldType manifTyp,
       typename = std::enable_if< std::is_same<VECTOR_TYP,vector3>::value>
      >
  bool const spuckManifDescr( VecManifDescr & vecManifDesc,
                Grid::VertexAttachmentAccessor<APosition> const & aaPos,
                VecPairSudoNormlV const & vecFractSudosNormlV,
                VecPairSudoVecLowDiEl const & vecFractSudosLDE,
                bool clearDescVec = true
  ) const
  {
    if( ! m_averaged )
    {
      UG_LOG("please average " << std::endl);
      UG_THROW("please average " << std::endl);
      return false;
    }
 
    if( clearDescVec )
      vecManifDesc.clear();
 
    for( PairSudoNormlV const & psn : vecFractSudosNormlV )
    {
      VECTOR_TYP posVrt = aaPos[m_vrt];
 
      int sudo = psn.first;
      VECTOR_TYP normlVec = psn.second;
 
//      ManifoldDescriptor( VECTOR_TYP const & normalVect,
//                VECTOR_TYP const & baseVect,
//                int sudo = -1,
//                ManifoldType = isArtificial,
//                number scaleShiftNormal = 0
//                )
//
 
      UG_LOG("ASSIGN MANIF TYP " << manifTyp << std::endl);
      ManifDescr manifDesc( normlVec, posVrt, sudo, manifTyp );
      // TODO FIXME der Manifold Descriptor muss noch die Vertizes wissen, die ihn aufspannen
      // abgesehen vom Zentrums-Vertex
 
      if( ! addLowDimElmListForSudo( manifDesc, sudo, vecFractSudosLDE ) )
      {
        UG_LOG("No low dim elems " << std::endl);
        UG_THROW("No low dim elems " << std::endl);
        return false;
      }
 
      vecManifDesc.push_back( manifDesc );
    }
 
    return true;
  }
 
  bool const addLowDimElmListForSudo( ManifDescr & md, INDEX_TXP sudo, VecPairSudoVecLowDiEl const & vecFractSudosLDE ) const
  {
    INDEX_TXP foundSudo = 0;
 
    for( PairSudoVecLowDiEl const & psvlde : vecFractSudosLDE )
    {
      INDEX_TXP sudoFract = psvlde.first;
 
      if( sudoFract == sudo )
      {
        foundSudo++;
 
        std::vector<LOWDIMELM> const & vecLoDiEl = psvlde.second;
 
        if( ! md.schluckLowDimElms( vecLoDiEl ) )
        {
          UG_LOG("NO LOWDIM ELEMS" << std::endl);
          return false;
        }
      }
    }
 
    if( foundSudo != 1 )
    {
      UG_LOG("NO SUDO FOUND LDE" << std::endl);
    }
 
    return ( foundSudo == 1 );
  }
 
  template< //typename GRID,
        //typename = std::enable_if< std::is_same<GRID, Grid >::value>,
        typename = std::enable_if< std::is_same<FULLDIM_ELEM,Volume*>::value>,
        typename = std::enable_if< std::is_same<FULLDIM_ELEM,Volume*>::value>
      >
  void determineListLowdimElms( Grid & grid )
  {
    for( FULLDIM_ELEM const & fe : m_contribFulldimElm )
    {
      for(size_t i_edge = 0; i_edge < fe->num_edges(); ++i_edge)
      {
        LOWDIMELM lowDimElm = grid.get_edge( fe, i_edge );
 
        if( EdgeContains(lowDimElm, m_vrt))
        {
          addElem(m_vecVolEdges, lowDimElm);
        }
      }
 
    }
 
    m_volEdgesDetermined = true;
  }
 
 
};
 
 
 
 
#if 0
template <typename VEC_AVEI, typename OPERATION, typename INDX_TYP  >
bool switchFulldimInfo( VEC_AVEI & vecAttVolElemInfoCop,
              VEC_AVEI const & vecAttVolElemInfo,
              VEC_AVEI & segmentAVEI,
              OPERATION opera,
            INDX_TYP switchInd = 0
           )
{
  auto & startVolInfoThisSegment = vecAttVolElemInfoCop[switchInd];
 
  auto const & startVol = startVolInfoThisSegment.opera();
 
  for( auto & possibleOrigVolInfo : vecAttVolElemInfo )
  {
    auto const & possVol = possibleOrigVolInfo.opera();
 
    if( possVol == startVol )
    {
      segmentAVEI().push_back(possibleOrigVolInfo);
      break;
    }
  }
 
  if( segmentAVEI().size() != 1 )
  {
    UG_LOG("No start volume reconstructible " << std::endl);
    UG_THROW("No start volume reconstructible " << std::endl);
    return false;
  }
 
  if( ! vecAttVolElemInfoCop.erase( vecAttVolElemInfoCop.begin() + switchInd ) )
    return false;
 
  return true;
 
}
#endif
 
 
 
template
<
typename FULLDIMEL,
typename MANIFEL,
typename LOWDIMEL,
typename VRTXTYP,
typename INDEXTYP
>
class EndingCrossingFractSegmentInfo
{
public:
 
  // TODO FIXME
  // wenn zwei an Kreuzungen endende Klüfte nur eine edge voneinander entfernt sind
  // dann ist ein edge split an allen Ecken notwendig, die die beiden Problemzonen
  // miteinander verbinden
  // eventuell muss man danach die ganze Prozedur nochmal von vorne anfangen
  // alternativ überlegen, ob man solche Punkte schon vor allen Segmentbildungen
  // heraus filtern kann, etwa mit der altmodischen Art und Weise, wie anfangs,
  // mit Loops über die Fracture faces...... um mindestens diese Stellen zu finden.....
  // und gleich ein split edge an allen notwendigen Verbindungen durch zu führen.....
  // hätte man die alte Methode vielleicht behalten sollen.......
 
  using ManifelPair = std::pair<MANIFEL,MANIFEL>;
 
  template<   typename = std::enable_if< std::is_pointer<MANIFEL>::value>,
        typename = std::enable_if< std::is_pointer<VRTXTYP>::value>
      >
  EndingCrossingFractSegmentInfo( VRTXTYP const & vrt,
                  MANIFEL const & endingFractManifCutting,
                  std::vector<MANIFEL> const & vecEndingFractManifNotCutting,
                  LOWDIMEL const & oldLowDimElCut,
                  ManifelPair const & pairNeighbouredFractClosedManifEl,
                  LOWDIMEL const & shiftDirectionElm,
                  std::vector<LOWDIMEL> const & vecLowDimElmsOfNotCuttingManifs,
                  INDEXTYP sudoFractEnding,
                  INDEXTYP sudoFractNotEnding
                  )
  :
    m_isEndingCleft(true),
    m_unclosedVrtx(vrt),
    m_endingFractManifCutting(endingFractManifCutting),
    m_vecEndingFractManifNotCutting(vecEndingFractManifNotCutting),
    m_pairNeighbouredFractClosedManifEl(pairNeighbouredFractClosedManifEl),
    m_vecClosedFracManifElNoNeighbr(std::vector<MANIFEL>()),
    m_oldLowDimElCut( oldLowDimElCut ),
    m_vecLowDimElmsOfNotCuttingManifs(vecLowDimElmsOfNotCuttingManifs),
    m_shiftDirectionElm(shiftDirectionElm),
    m_sudoFractEnding(sudoFractEnding),
    m_sudoFractNotEnding(sudoFractNotEnding),
    m_vecFulldimEl(std::vector<FULLDIMEL>()),
    m_shiftVrtx(nullptr),
    m_hiddenCutManifEl(nullptr)
  {
  };
 
  template<   typename = std::enable_if< std::is_pointer<MANIFEL>::value>,
        typename = std::enable_if< std::is_pointer<VRTXTYP>::value>
      >
  // if there is no ending fract manif no cutting available
  EndingCrossingFractSegmentInfo( VRTXTYP const & vrt,
                  MANIFEL const & endingFractManifCutting,
                  LOWDIMEL const & oldLowDimElCut,
                  ManifelPair const & pairNeighbouredFractClosedManifEl,
                  LOWDIMEL const & shiftDirectionElm,
                  int sudoFractEnding,
                  int sudoFractNotEnding
                  )
  :
    m_isEndingCleft(true),
    m_unclosedVrtx(vrt),
    m_endingFractManifCutting(endingFractManifCutting),
    m_vecEndingFractManifNotCutting(std::vector<MANIFEL>()),
    m_pairNeighbouredFractClosedManifEl(pairNeighbouredFractClosedManifEl),
    m_vecClosedFracManifElNoNeighbr(std::vector<MANIFEL>()),
    m_oldLowDimElCut( oldLowDimElCut ),
    m_vecLowDimElmsOfNotCuttingManifs(std::vector<LOWDIMEL>()),
    m_shiftDirectionElm(shiftDirectionElm),
    m_sudoFractEnding(sudoFractEnding),
    m_sudoFractNotEnding(sudoFractNotEnding),
    m_vecFulldimEl(std::vector<FULLDIMEL>()),
    m_shiftVrtx(nullptr),
    m_hiddenCutManifEl(nullptr)
  {
  };
 
  template<   typename = std::enable_if< std::is_pointer<MANIFEL>::value>,
        typename = std::enable_if< std::is_pointer<LOWDIMEL>::value>,
        typename = std::enable_if< std::is_pointer<VRTXTYP>::value>,
        typename = std::enable_if< std::is_integral<INDEXTYP>::value>
      >
  // if there is no ending fract manif no cutting available
  EndingCrossingFractSegmentInfo()
  :
    m_isEndingCleft(false),
    m_unclosedVrtx(nullptr),
    m_endingFractManifCutting(nullptr),
    m_vecEndingFractManifNotCutting(std::vector<MANIFEL>()),
    m_pairNeighbouredFractClosedManifEl(ManifelPair(nullptr,nullptr)),
    m_vecClosedFracManifElNoNeighbr(std::vector<MANIFEL>()),
    m_oldLowDimElCut( nullptr ),
    m_vecLowDimElmsOfNotCuttingManifs(std::vector<LOWDIMEL>()),
    m_shiftDirectionElm(nullptr),
    m_sudoFractEnding(std::numeric_limits<INDEXTYP>::max()),
    m_sudoFractNotEnding(std::numeric_limits<INDEXTYP>::max()),
    m_vecFulldimEl(std::vector<FULLDIMEL>()),
    m_shiftVrtx(nullptr),
    m_hiddenCutManifEl(nullptr)
  {
  };
 
  bool schluckShiftVrtx( VRTXTYP const & shiftVrtx )
  {
 
    if(    m_shiftVrtx != nullptr
      && shiftVrtx != m_shiftVrtx
      )
    {
      UG_LOG("Shift Vertex already set different " << std::endl);
      UG_THROW("Shift Vertex already set different " << std::endl);
      return false;
    }
 
    if( shiftVrtx != nullptr )
    {
      m_shiftVrtx = shiftVrtx;
      return true;
    }
 
    // else
 
//    UG_LOG("SHift vertex already set " << std::endl);
//    UG_THROW("SHift vertex already set " << std::endl);
 
    return false;
  }
 
  VRTXTYP const spuckShiftVrtx() const
  {
    return m_shiftVrtx;
//    if( m_shiftVrtx != nullptr )
//    {
//      shiftVrtx = m_shiftVrtx;
//      return true;
//    }
//
//    return false;
  }
 
  bool isEndingCleft() { return m_isEndingCleft; }
 
  // schluck
 
  bool schluckClosedFracManifElNoNeighbr( MANIFEL const & closFracME )
  {
    return schluckElem( closFracME, m_vecClosedFracManifElNoNeighbr );
 
  }
 
  bool schluckVecClosedFracManifElNoNeighbr( std::vector<MANIFEL> const & vecClosFracME )
  {
    return schluckVecElem( vecClosFracME, m_vecClosedFracManifElNoNeighbr );
  }
 
  bool schluckFulldimElm( FULLDIMEL const & fuDiEl )
  {
    return schluckElem( fuDiEl, m_vecFulldimEl );
  }
 
  bool schluckVecFulldimElm( std::vector<FULLDIMEL> const & vecFuDiEl )
  {
    return schluckVecElem( vecFuDiEl, m_vecFulldimEl );
  }
 
  // spuck
 
//  bool spuckUnclosedVrtx( VRTXTYP & vrt )
//  {
//    vrt = m_unclosedVrtx;
//    return true;
//  }
//
//  bool spuckVecClosedFracManifElNoNeighbr( std::vector<MANIFEL> & vecClosFracManifEl )
//  {
//    vecClosFracManifEl = m_vecClosedFracManifElNoNeighbr;
//
//    return (m_vecClosedFracManifElNoNeighbr.size() != 0 );
//  }
//
//  bool spuckEndingFractManifCutting( MANIFEL & endingFractManifCutting )
//  {
//    endingFractManifCutting = m_endingFractManifCutting;
//    return true;
//  }
//
//  bool spuckEndingFractManifNotCutting( MANIFEL & efmnc )
//  {
//    efmnc = m_endingFractManifNotCutting;
//    return true;
//  }
//
//  bool spuckOldLowDimElCut( LOWDIMEL & ldec )
//  {
//    ldec = m_oldLowDimElCut;
//    return true;
//  }
//
//  bool spuckPairNeighbouredFractClosedManifEl( ManifelPair & neighFracClosME )
//  {
//    neighFracClosME = m_pairNeighbouredFractClosedManifEl;
//    return true;
//  }
 
  VRTXTYP const spuckUnclosedVrtx() const
  {
    return m_unclosedVrtx;
  }
 
  std::vector<MANIFEL> const spuckVecClosedFracManifElNoNeighbr() const
  {
    return m_vecClosedFracManifElNoNeighbr;
  }
 
  MANIFEL const spuckEndingFractManifCutting() const
  {
    return m_endingFractManifCutting;
  }
 
  std::vector<MANIFEL> const spuckVecEndingFractManifNotCutting() const
  {
    return m_vecEndingFractManifNotCutting;
  }
 
  LOWDIMEL const spuckOldLowDimElCut() const
  {
    return m_oldLowDimElCut;
  }
 
  std::vector<LOWDIMEL> const spuckVecLowDimElmsOfNotCuttingManifs()
  {
    return m_vecLowDimElmsOfNotCuttingManifs;
  }
 
  ManifelPair const spuckPairNeighbouredFractClosedManifEl() const
  {
    return m_pairNeighbouredFractClosedManifEl;
  }
 
  INDEXTYP const spuckSudoFractEnding() const { return m_sudoFractEnding; }
  INDEXTYP const spuckSudoFractNotEnding() const { return m_sudoFractNotEnding; }
 
  std::vector<FULLDIMEL> const spuckVecFulldimEl() const
  {
    return m_vecFulldimEl;
  }
 
  // shift element edge
 
 
  template<   typename = std::enable_if< std::is_pointer<LOWDIMEL>::value>
      >
  LOWDIMEL const spuckLowdimElmShiftDirection() const
  {
    return m_shiftDirectionElm;
  }
 
  bool schluckHiddenCutFractManifEl( MANIFEL const & manifel )
  {
    if( m_hiddenCutManifEl == nullptr && manifel != m_hiddenCutManifEl )
    {
      m_hiddenCutManifEl = manifel;
      return true;
    }
 
    return false;
  }
 
  MANIFEL const spuckHiddenCutFractManifEl() const
  {
    return m_hiddenCutManifEl;
  }
 
private:
 
  bool m_isEndingCleft;
 
  // TODO FIXME vielleicht statt Manifel die Klasse,  Attached Fracture Objekte? mit richtig geordneten Edges?
 
  VRTXTYP m_unclosedVrtx;
  MANIFEL m_endingFractManifCutting;
//  MANIFEL m_endingFractManifNotCutting;
  std::vector<MANIFEL> m_vecEndingFractManifNotCutting;
 
  ManifelPair m_pairNeighbouredFractClosedManifEl;
 
  // NOTE here only those which do not have a common edge with the ending cleft!
  std::vector<MANIFEL> m_vecClosedFracManifElNoNeighbr;
 
  LOWDIMEL m_oldLowDimElCut; // common edge between ending frac face with one sudo and durchgehende frac faces with another sudo
//  LOWDIMEL m_newLowDimElCut;
 
  std::vector<LOWDIMEL> m_vecLowDimElmsOfNotCuttingManifs;
 
  LOWDIMEL m_shiftDirectionElm;
 
  INDEXTYP m_sudoFractEnding;
  INDEXTYP m_sudoFractNotEnding;
 
  std::vector<FULLDIMEL> m_vecFulldimEl;
 
  VRTXTYP m_shiftVrtx;
 
  MANIFEL m_hiddenCutManifEl;
 
  template <typename ELEMTYP>
  bool schluckElem( ELEMTYP const & anotherEl, std::vector<ELEMTYP> & vecElmKnown )
  {
    bool elemNotKnown = true;
 
    for( ELEMTYP me : vecElmKnown )
    {
      if( me == anotherEl )
      {
        elemNotKnown = false;
        break;
      }
    }
 
    if( elemNotKnown )
      vecElmKnown.push_back(anotherEl);
 
    return elemNotKnown;
  }
 
  template <typename ELEMTYP>
  bool schluckVecElem( std::vector<ELEMTYP> const & anotherVecEl, std::vector<ELEMTYP> & vecElmKnown )
  {
    bool someElemsUnknown = false;
 
    for( ELEMTYP me : anotherVecEl )
    {
      if( schluckElem( me, vecElmKnown ) )
      {
        someElemsUnknown = true;
      }
    }
 
    return someElemsUnknown;
  }
};
 
 
}
 
}
 
#endif /* UGCORE_UGBASE_LIB_GRID_ALGORITHMS_EXTRUSION_SUPPORT3D_H_ */