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// $Id: G4InteractionCase.hh,v 1.11 2010/05/21 17:56:34 mkelsey Exp $
// GEANT4 tag: $Name: geant4-09-04-beta-cand-01 $
//
// 20100518  M. Kelsey -- Why use std::pair<> at all?  Never exported; just
//		store pointers.  Add clear() function.  Move code from
//		Colliders' "bulletTargetSetter()" to set().

#ifndef G4INTERACTION_CASE_HH
#define G4INTERACTION_CASE_HH

#include "globals.hh"

class G4InuclParticle;


class G4InteractionCase {
public:
  G4InteractionCase() : bullet(0), target(0), inter_case(0) {}

  G4InteractionCase(G4InuclParticle* part1, G4InuclParticle* part2) {
    set(part1, part2);
  }

  void set(G4InuclParticle* part1, G4InuclParticle* part2);

  void clear() {
    bullet = target = 0;
    inter_case = 0;
  }

  G4InuclParticle* getBullet() const { return bullet; }
  G4InuclParticle* getTarget() const { return target; }

  G4bool valid() const      { return inter_case != 0; }

  G4bool twoNuclei() const  { return inter_case == -2; }
  G4bool hadNucleus() const { return inter_case == -1; }
  G4int  hadrons() const    { return inter_case; }	// "rtype" or "is" code

  // For compatibility with G4IntraNucleiCascader code
  G4int  code() const { return ((inter_case<0) ? -inter_case : 0); }

private:
  G4InuclParticle* bullet;
  G4InuclParticle* target;

  G4int inter_case;
};

#endif // G4INTERACTION_CASE_HH 


