/usr/include/BALL/CONCEPT/comparator.h is in libball1.4-dev 1.4.3~beta1-4.
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// vi: set ts=2:
//
#ifndef BALL_CONCEPT_COMPARATOR_H
#define BALL_CONCEPT_COMPARATOR_H
#ifndef BALL_COMMON_H
# include <BALL/common.h>
#endif
namespace BALL
{
/** Generic Comparator Class.
It is used as a baseclass, providing a common interface.
\ingroup ConceptsMiscellaneous
*/
template <typename T>
class Comparator
{
public:
/** @name Constructors and Destructors
*/
//@{
/** Default constructor
*/
Comparator()
;
/** Destructor
*/
virtual ~Comparator()
;
//@}
/** @name Predicates
*/
//@{
/** Test if two values are equal.
*/
virtual bool isEqual(const T& a, const T& b) const
;
/** Test if two values are unequal.
*/
bool isNotEqual(const T& a, const T& b) const
;
/** Test if a is less then b.
*/
virtual bool isLess(const T& a, const T& b) const
;
/** Test if a is less or equal.
*/
bool isLessOrEqual(const T& a, const T& b) const
;
/** Test if a is greater or equal.
*/
bool isGreaterOrEqual(const T& a, const T& b) const
;
/** Test if a is greater then b.
*/
bool isGreater(const T& a, const T& b) const
;
/** Compare two values.
-1 is returned if a < b. \par
0 is returned if a == b. \par
1 is returned if a > b.
*/
int operator () (const T& a, const T& b) const
;
//@}
};
template <typename T>
inline Comparator<T>::Comparator()
{
}
template <typename T>
inline Comparator<T>::~Comparator()
{
}
template <class T>
inline bool Comparator<T>::isEqual(const T& a, const T& b) const
{
return (a == b);
}
template <class T>
inline bool Comparator<T>::isNotEqual(const T& a, const T& b) const
{
return !isEqual(a, b);
}
template <class T>
inline bool Comparator<T>::isLess(const T& a, const T& b) const
{
return (a < b);
}
template <class T>
inline bool Comparator<T>::isLessOrEqual(const T& a, const T& b) const
{
return !isLess(b, a);
}
template <class T>
inline bool Comparator<T>::isGreaterOrEqual(const T& a, const T& b) const
{
return !isLess(a, b);
}
template <class T>
inline bool Comparator<T>::isGreater(const T& a, const T& b) const
{
return isLess(b, a);
}
template <class T>
inline int Comparator<T>::operator () (const T& a,const T& b) const
{
if (isEqual(a, b) == true)
{
return 0;
}
if (isLess(a, b) == true)
{
return -1;
}
else
{
return 1;
}
}
} // namespace BALL
#endif // BALL_CONCEPT_COMPARATOR_H
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