Functors for building compex queries.

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

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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() ) );

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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.