namespace Utility
{
  namespace ExH
  {
    namespace Logic
    {
      class DescriptiveException : public virtual Exception
      {
      public:
        explicit
        DescriptiveException (char const* description) throw ();
        explicit
        DescriptiveException (std::string const& description) throw ();
        template <typename T>
        explicit
        DescriptiveException (T const& description) throw ();
        DescriptiveException (DescriptiveException const& src) throw ();
        virtual
        ~DescriptiveException () throw ();
        DescriptiveException&
        operator= (DescriptiveException const& src) throw ();
      protected:
        DescriptiveException () throw ();
        void
        init (char const* description) throw ();
      public:
        virtual char const*
        what () const throw ();
      private:
        std::auto_ptr<std::string> description_;
      };
    }
  }
}