///Long integer specialization of \ref Tolerance.

   ///Long integer specialization of \ref Tolerance.

   ///\sa Tolerance

   template<>

   class Tolerance<long int>

   {

   public:

     ///\e

     typedef long int Value;

     ///\name Comparisons

     ///See \ref Tolerance for more details.

     ///@{

     ///Returns \c true if \c a is \e surely strictly less than \c b

     static bool less(Value a,Value b) { return a<b;}

     ///Returns \c true if \c a is \e surely different from \c b

     static bool different(Value a,Value b) { return a!=b; }

     ///Returns \c true if \c a is \e surely positive

     static bool positive(Value a) { return 0<a; }

     ///Returns \c true if \c a is \e surely negative

     static bool negative(Value a) { return 0>a; }

     ///Returns \c true if \c a is \e surely non-zero

     static bool nonZero(Value a) { return a!=0;};

     ///@}

     ///Returns zero

     static Value zero() {return 0;}

   };

   ///Unsigned long integer specialization of \ref Tolerance.

   ///Unsigned long integer specialization of \ref Tolerance.

   ///\sa Tolerance

   template<>

   class Tolerance<unsigned long int>

   {

   public:

     ///\e

     typedef unsigned long int Value;

     ///\name Comparisons

     ///See \ref Tolerance for more details.

     ///@{

     ///Returns \c true if \c a is \e surely strictly less than \c b

     static bool less(Value a,Value b) { return a<b;}

     ///Returns \c true if \c a is \e surely different from \c b

     static bool different(Value a,Value b) { return a!=b; }

     ///Returns \c true if \c a is \e surely positive

     static bool positive(Value a) { return 0<a; }

     ///Returns \c true if \c a is \e surely negative

     static bool negative(Value) { return false; }

     ///Returns \c true if \c a is \e surely non-zero

     static bool nonZero(Value a) { return a!=0;};

     ///@}

     ///Returns zero

     static Value zero() {return 0;}

   };