id.h

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#ifndef DMN_ID_H
#define DMN_ID_H 1

#include <set>

namespace dmn
{
  typedef unsigned short ID;

  const ID ID_NULL = 0;

  class IDs
  {
  private:
    std::set<ID> ids_;

  public:
    ID create();

    bool destroy(ID id);

    bool exist(ID id);

    unsigned short size();
  };
};

#endif // DMN_ID_H

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