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// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//
#ifndef BALL_CONCEPT_PREDICATE_H
#define BALL_CONCEPT_PREDICATE_H
#ifndef BALL_COMMON_GLOBAL_H
# include <BALL/COMMON/global.h>
#endif
#include <functional>
namespace BALL
{
using std::unary_function;
using std::binary_function;
/** @name Predicates
\ingroup ConceptsMiscellaneous
*/
//@{
/** Generic Unary Predicate Class
*/
template <typename T>
class UnaryPredicate
: public unary_function<T, bool>
{
public:
///
virtual ~UnaryPredicate() {}
///
virtual bool operator() (const T& /* x */) const
;
};
/** Generic Binary Predicate Class
*/
template <typename T1, typename T2>
class BinaryPredicate
: public binary_function<T1, T2, bool>
{
public:
///
virtual bool operator() (const T1& x, const T2& y) const
;
///
virtual ~BinaryPredicate() {}
};
template <typename T>
bool UnaryPredicate<T>::operator() (const T& /* x */) const
{
return true;
}
template <typename T1, typename T2>
bool BinaryPredicate<T1, T2>::operator() (const T1&, const T2&) const
{
return true;
}
//@}
} // namespace BALL
#endif // BALL_CONCEPT_PREDICATE_H
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