EventContextHash.h

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#ifndef __EVENT_CONTEXT_HASH_H
#define __EVENT_CONTEXT_HASH_H
#include "GaudiKernel/EventContext.h"
class EventContextHash{
 public:
  size_t hash(const EventContext& ctx)const {
    size_t en=ctx.evt();
    size_t es=ctx.slot();
    return en^(es+(en<<6)+(en>>2));
  }
  bool equal(const EventContext& a, const EventContext& b)const{
    return hash(a)==hash(b);
  }
  
  std::size_t operator()(const EventContext& ctx)const{
    return hash(ctx);
  }
  bool operator()(const EventContext& ctx,const EventContext& ctxb)const{
    return equal(ctx,ctxb);
  }
};

#endif