LEMON/LEMON-main Changeset - r497:7d7d9debb29a

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Changeset - r497:7d7d9debb29a

« 496:7992dc

499:b1ef32 »

r497:7d7d9debb29a

Fri, 20 Feb 2009 19:06:10

[Not Reviewed]

0 comments (0 inline)

alpar (Alpar Juttner)
alpar@cs.elte.hu

Default implementation of Tolerance<> is used for integer types (#229)

0 1 0

default

1 file changed with 9 insertions and 219 deletions:

lemon/tolerance.h

219

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lemon/tolerance.h

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@@ -35,23 +35,20 @@
 		  ///as a result of a probably inexact computation.
 		  ///
 		  ///\ref Tolerance is a class to provide a basic way to
 		  ///handle the comparison of numbers that are obtained
 		  ///as a result of a probably inexact computation.
 		  ///
 		  ///This is an abstract class, it should be specialized for all
 		  ///numerical data types. These specialized classes like
 		  ///The general implementation is suitable only if the data type is exact,
 		  ///like the integer types, otherwise a specialized version must be
 		  ///implemented. These specialized classes like
 		  ///Tolerance<double> may offer additional tuning parameters.
 		  ///
 		  ///\sa Tolerance<float>
 		  ///\sa Tolerance<double>
 		  ///\sa Tolerance<long double>
 		  ///\sa Tolerance<int>
 		  ///\sa Tolerance<long long int>
 		  ///\sa Tolerance<unsigned int>
 		  ///\sa Tolerance<unsigned long long int>
 		  template<class T>
 		  class Tolerance
+		  {
 		  public:
 		    typedef T Value;
@@ -61,26 +58,26 @@
 		    ///the related comparisons hold even if some numerical error appeared
 		    ///during the computations.
 		    ///@{
 		    ///Returns \c true if \c a is \e surely strictly less than \c b
-		    static bool less(Value a,Value b) {return false;}
+		    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 false;}
+		    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 false;}
+		    static bool positive(Value a) {return static_cast<Value>(0) < a;}
 		    ///Returns \c true if \c a is \e surely negative
-		    static bool negative(Value a) {return false;}
+		    static bool negative(Value a) {return a < static_cast<Value>(0);}
 		    ///Returns \c true if \c a is \e surely non-zero
-		    static bool nonZero(Value a) {return false;}
+		    static bool nonZero(Value a) {return a != static_cast<Value>(0);}
 		    ///@}
 		    ///Returns the zero value.
-		    static Value zero() {return T();}
+		    static Value zero() {return static_cast<Value>(0);}
 		    //   static bool finite(Value a) {}
 		    //   static Value big() {}
 		    //   static Value negativeBig() {}
 		  };
@@ -235,218 +232,11 @@
 		    ///@}
 		    ///Returns zero
 		    static Value zero() {return 0;}
 		  };
 		  ///Integer specialization of Tolerance.
 		  ///Integer specialization of Tolerance.
 		  ///\sa Tolerance
 		  template<>
 		  class Tolerance<int>
+		  {
 		  public:
 		    ///\e
 		    typedef int Value;
 		    ///\name Comparisons
 		    ///See \ref lemon::Tolerance "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 integer specialization of Tolerance.
 		  ///Unsigned integer specialization of Tolerance.
 		  ///\sa Tolerance
 		  template<>
 		  class Tolerance<unsigned int>
+		  {
 		  public:
 		    ///\e
 		    typedef unsigned int Value;
 		    ///\name Comparisons
 		    ///See \ref lemon::Tolerance "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;}
 		  };
 		  ///Long integer specialization of Tolerance.
 		  ///Long integer specialization of Tolerance.
 		  ///\sa Tolerance
 		  template<>
 		  class Tolerance<long int>
+		  {
 		  public:
 		    ///\e
 		    typedef long int Value;
 		    ///\name Comparisons
 		    ///See \ref lemon::Tolerance "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 Tolerance.
 		  ///Unsigned long integer specialization of Tolerance.
 		  ///\sa Tolerance
 		  template<>
 		  class Tolerance<unsigned long int>
+		  {
 		  public:
 		    ///\e
 		    typedef unsigned long int Value;
 		    ///\name Comparisons
 		    ///See \ref lemon::Tolerance "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;}
 		  };
 		#if HAVE_LONG_LONG
 		  ///Long long integer specialization of Tolerance.
 		  ///Long long integer specialization of Tolerance.
 		  ///\warning This class (more exactly, type <tt>long long</tt>)
 		  ///is not ansi compatible.
 		  ///\sa Tolerance
 		  template<>
 		  class Tolerance<long long int>
+		  {
 		  public:
 		    ///\e
 		    typedef long long int Value;
 		    ///\name Comparisons
 		    ///See \ref lemon::Tolerance "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 long integer specialization of Tolerance.
 		  ///Unsigned long long integer specialization of Tolerance.
 		  ///\warning This class (more exactly, type <tt>unsigned long long</tt>)
 		  ///is not ansi compatible.
 		  ///\sa Tolerance
 		  template<>
 		  class Tolerance<unsigned long long int>
+		  {
 		  public:
 		    ///\e
 		    typedef unsigned long long int Value;
 		    ///\name Comparisons
 		    ///See \ref lemon::Tolerance "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;}
 		  };
 		#endif
 		  /// @}
 		} //namespace lemon
 		#endif //LEMON_TOLERANCE_H

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