Some logical functors to build more complex queries: More...

Classes
struct	zypp::functor::Constant< T >

struct	zypp::functor::True
	Logical functor always `true`. More...

struct	zypp::functor::False
	Logical functor always `false`. More...

struct	zypp::functor::Not< _Condition >
	Logical functor inverting _Condition. More...

struct	zypp::functor::Or< _ACondition, _BCondition >
	Logical functor chaining _ACondition `OR` _BCondition. More...

struct	zypp::functor::Chain< _ACondition, _BCondition >
	Logical functor chaining _ACondition `AND` _BCondition. More...

Functions
template<class T >
Constant< T >	zypp::functor::constant (const T &value)

True	zypp::functor::true_c ()
	Convenience function for creating a True. More...

False	zypp::functor::false_c ()
	Convenience function for creating a False. More...

template<class _Condition >
Not< _Condition >	zypp::functor::not_c (_Condition cond_r)
	Convenience function for creating a Not from _Condition. More...

template<class _ACondition , class _BCondition >
Or< _ACondition, _BCondition >	zypp::functor::or_c (_ACondition conda_r, _BCondition condb_r)
	Convenience function for creating a Or from two conditions conda_r OR condb_r. More...

template<class _ACondition , class _BCondition >
Chain< _ACondition, _BCondition >	zypp::functor::chain (_ACondition conda_r, _BCondition condb_r)
	Convenience function for creating a Chain from two conditions conda_r and condb_r. More...

Detailed Description

Some logical functors to build more complex queries:

True and False. No supprise, they always return true or false.
Not<_Condition>. _Condition is a functor, and it's result is inverted.
Chain<_ACondition,_BCondition>. _ACondition and _BCondition are functors, and Chain evaluates _ACondition && _BCondition.

As it's no fun to get and write the correct template arguments, convenience functions creating the correct functor are provided.

true_c and false_c. (provided just to match the schema)
not_c. Takes a functor as argument and returns the appropriate Not functor.
chain. Takes two functors and returns the appropriate Cain functor.

*  struct Print; // functor printing elements
*  struct Count; // functor counting number of elements
*
*  std::for_each( c.begin(), c.end(),
*                 chain( Print(), Count() ) );
* 

Function Documentation

template<class T >

Constant<T> zypp::functor::constant ( const T & value )

inline

Definition at line 237 of file Functional.h.

True zypp::functor::true_c ( )

inline

Convenience function for creating a True.

Definition at line 252 of file Functional.h.

False zypp::functor::false_c ( )

inline

Convenience function for creating a False.

Definition at line 267 of file Functional.h.

template<class _Condition >

Not<_Condition> zypp::functor::not_c ( _Condition cond_r )

inline

Convenience function for creating a Not from _Condition.

Definition at line 290 of file Functional.h.

template<class _ACondition , class _BCondition >

Or<_ACondition, _BCondition> zypp::functor::or_c	(	_ACondition	conda_r,
		_BCondition	condb_r
	)

inline

Convenience function for creating a Or from two conditions conda_r OR condb_r.

Definition at line 319 of file Functional.h.

template<class _ACondition , class _BCondition >

Chain<_ACondition, _BCondition> zypp::functor::chain	(	_ACondition	conda_r,
		_BCondition	condb_r
	)

inline

Convenience function for creating a Chain from two conditions conda_r and condb_r.

Definition at line 348 of file Functional.h.

Classes

Functions

Detailed Description

Function Documentation