idgenerator.h

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#ifndef HORUSEYE_FRAMEWORK_IDGENERATOR_H_
#define HORUSEYE_FRAMEWORK_IDGENERATOR_H_

#include <ugdk/portable/tr1.h>

#include FROM_TR1(unordered_set)

#include <ugdk/util/uncopyable.h>

namespace ugdk {
namespace util {
class IDGenerator : public Uncopyable {
  public:
    IDGenerator(int min_id, int max_id, int error_value);
    ~IDGenerator() {}

    int GenerateID();

    int ReleaseID(int id);
  private:
    int                             current_id_;
    const int                       min_id_,
                                    max_id_,
                                    error_value_;
    std::tr1::unordered_set<int>    unused_ids_;
    size_t range () const { return static_cast<size_t>(max_id_ - min_id_ + 1);}
};

} // namespace util
} // namespace ugdk

#endif