interface of a generic filter iterator. More...

#include <types.h>

Inheritance diagram for siena::filter::iterator:

Collaboration diagram for siena::filter::iterator:

Public Member Functions
virtual bool	next ()=0
	moves this iterator to the next attribute in the sequence. More...

virtual	~iterator ()
	destructor

Public Member Functions inherited from siena::constraint
virtual	~constraint ()
	virtual destructor

virtual operator_id	op () const =0
	returns the operator defined for this constraint.

virtual bool	covers (const attribute &a) const
	applies this constraint to an attribute. More...

Public Member Functions inherited from siena::attribute
virtual	~attribute ()
	virtual destructor

virtual string_t	name () const =0
	returns the name of this attribute.

Public Member Functions inherited from siena::value
virtual	~value ()
	virtual destructor

virtual type_id	type () const =0
	returns the actual type identifier of this value. More...

virtual int_t	int_value () const =0
	returns this value as an integer. More...

virtual string_t	string_value () const =0
	returns this value as a string. More...

virtual bool_t	bool_value () const =0
	returns this value as a boolean. More...

virtual double_t	double_value () const =0
	returns this value as a double. More...

Detailed Description

interface of a generic filter iterator.

provides sequential access to the constraints of a filter.

Member Function Documentation

virtual bool siena::filter::iterator::next ( )

pure virtual

moves this iterator to the next attribute in the sequence.

Returns: true if the constraint pointed to by this iterator before this call to next() is not the last one in its filter. In this case, after this call to next(), this iterator will point to the next constraint.
false if this iterator points to the last constraint or to the end of the sequence. In this case, after this call to next(), this iterator will point to an invalid constraint representing the end of the sequence.