ExclusiveHash.hpp

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// ANNA - Anna is Not Nothingness Anymore                                                         //
//                                                                                                //
// (c) Copyright 2005-2015 Eduardo Ramos Testillano & Francisco Ruiz Rayo                         //
//                                                                                                //
// See project site at http://redmine.teslayout.com/projects/anna-suite                           //
// See accompanying file LICENSE or copy at http://www.teslayout.com/projects/public/anna.LICENSE //


#ifndef anna_core_util_ExclusiveHash_hpp
#define anna_core_util_ExclusiveHash_hpp

#include <map>

namespace anna {

template < class T, class _K = unsigned long > class ExclusiveHash {
  typedef std::map <T, _K> container;
  typedef typename container::value_type value_type;

public:
  ExclusiveHash() : a_value(0) {;}

  _K calcule(const T& t)
  {
    typename container::iterator ii;
    _K result = 0;

    if((ii = a_container.find(t)) == a_container.end()) {
      result = a_value ++;
      a_container.insert(value_type(t, result));
    } else
      result = ii->second;

    return result;
  }

private:
  container a_container;
  _K a_value;
};

}

#endif