ProvideNumericId.h

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#ifndef ZYPP_BASE_PROVIDENUMERICID_H
#define ZYPP_BASE_PROVIDENUMERICID_H

namespace zypp
{ 

  namespace base
  { 

    //
    //  CLASS NAME : ProvideNumericId
    //
    template<class _Derived, class _NumericIdType>
      struct ProvideNumericId
      {
      public:
        _NumericIdType numericId() const
        { return _numericId; }

      protected:
        ProvideNumericId()
        : _numericId( nextId() )
        {}
        ProvideNumericId( const ProvideNumericId & /*rhs*/ )
        : _numericId( nextId() )
        {}
        ProvideNumericId & operator=( const ProvideNumericId & /*rhs*/ )
        { return *this; }
        ~ProvideNumericId()
        {}
      protected:
        ProvideNumericId( const void *const )
        : _numericId( 0 )
        {}
      private:
        static _NumericIdType nextId()
        {
          static _NumericIdType _staticCounter = 0;
          // Assert not returning 0
          return ++_staticCounter;
        }
        const _NumericIdType _numericId;
      };

  } // namespace base
} // namespace zypp
#endif // ZYPP_BASE_PROVIDENUMERICID_H