SundanceIntHashSet.hpp

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//                             Sundance
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/* @HEADER@ */

#ifndef SUNDANCE_INTHASHSET_H
#define SUNDANCE_INTHASHSET_H

#include "SundanceDefs.hpp"
#include "SundanceSet.hpp"
#include "Teuchos_Array.hpp"
#include <list>


namespace Sundance
{
  using namespace Teuchos;

  /** 
   *
   */
  class IntHashSet
  {
  public:
    /** */
    IntHashSet();

    /** */
    void setCapacity(int capacity);

    /** */
    inline void put(int x) 
    {
      
      std::list<int>& d = data_[hashFunc(x)];
      for (std::list<int>::const_iterator i=d.begin(); i != d.end(); i++)
        {
          if (x == *i) return;
        }
      d.push_back(x);
      size_++;
    }

    /** */
    bool contains(int x) const ;

    /** */
    int size() const {return size_;}

    /** */
    void fillArray(int* a) const ;

  private:

    inline int hashFunc( const int key ) const { return (seed() ^ key)%capacity_; }

    static unsigned int seed() {static int rtn = (2654435761U); return rtn;}
    unsigned int capacity_;
    Array<std::list<int> > data_;
    int size_;
  };

}


#endif