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BALL::BaseIterator< Container, DataType, Position, Traits > Class Template Reference
Foundation Classes » Concepts » Iterators

`#include <BALL/CONCEPT/baseIterator.h>`

Inheritance diagram for BALL::BaseIterator< Container, DataType, Position, Traits >:

## Public Types

Typedefs.
The names of these typedefs deviate from the usual BALL class names due to restrictions imposed by STL compliance.
typedef DataType | value_type
typedef Position | difference_type
typedef const DataType * | pointer
typedef const DataType & | reference
typedef std::input_iterator_tag | iterator_category

## Public Member Functions

Constructors and Destructors
BALL_INLINE | BaseIterator ()
| Default constructor.
BALL_INLINE | BaseIterator (const BaseIterator &iterator)
| Copy constructor.
BALL_INLINE | ~BaseIterator ()
| Destructor.
Assignment
BALL_INLINE BaseIterator & | operator= (const BaseIterator &iterator)
BALL_INLINE void | swap (BaseIterator &iterator)
| Swap two iterators.
Accessors
BALL_INLINE void | invalidate ()
| Invalidate the iterator.
BALL_INLINE void | setTraits (const Traits &traits)
| Set the traits.
BALL_INLINE const Traits & | getTraits () const
| Get a constant reference to the traits of this iterator.
BALL_INLINE Traits & | getTraits ()
| Get a constant reference to the traits of this iterator.
BALL_INLINE const Container * | getContainer () const
| Get a constant pointer to the container of this iterator.
Converters
BALL_INLINE | operator const Position & () const
BALL_INLINE reference | operator* () const
| Convert an iterator to its Datatype by returning a reference to the current data.
BALL_INLINE pointer | operator-> () const
| Return a pointer to the current data.

## Predicates

BALL_INLINE bool | operator== (const BaseIterator &iterator) const
| Equality operator.
BALL_INLINE bool | operator!= (const BaseIterator &iterator) const
| Inequality operator.
BALL_INLINE bool | isSingular () const
BALL_INLINE bool | isValid () const
BALL_INLINE bool | operator+ () const
| Validity predicate.
BALL_INLINE bool | operator- () const
| Invalidity perdicate.
BALL_INLINE | BaseIterator (const Container &container)

## Detailed Description

template<typename Container, typename DataType, typename Position, typename Traits>
class BALL::BaseIterator< Container, DataType, Position, Traits >

Generic Iterator Class. This template class implements the basic behaviour of an iterator. Iterators are basically STL-like iterators. They provide the full STL iterator interface, but also offer additional features.

BaseIterator itself is a base class to the other iterator classes only and should not be used by itself.

An important difference exists for the iterators of the kernel objects. For most kernel objects, multiple iterators exist. Therefore, we could not simply use begin() and end() like in STL, but we introduced specialized methods like AtomContainer::beginAtom and AtomContainer::endAtom . For similar reasons, the iterators for kernel classes are not implemented as nested classes of the respective kernel classes, but as independent classes to avoid code replication. An exception is Atom::BondIterator , which is relevant to Atom alone.

Each BALL iterator can be bound to a container, so once the iteration has started, it "knows" about the end() of the container. Therefore, BALL iterators additionally implement the unary plus operator to check for the validity of the iterator. this allows the convenient implementation of for loops, e.g. as follows:

AtomIterator atom_it = system.beginAtom();
for (; +atom_it; ++atom_it)
{
....
}
BALL::AtomIterator
BidirectionalIterator< Composite, Atom, Composite::CompositeIterator, AtomIteratorTraits > AtomIterator
Definition atomIterator.h:84

Definition at line 64 of file baseIterator.h.

## Member Typedef Documentation

## difference_type

template<typename Container, typename DataType, typename Position, typename Traits>

typedef Position BALL::BaseIterator< Container, DataType, Position, Traits >::difference_type

Definition at line 76 of file baseIterator.h.

## iterator_category

template<typename Container, typename DataType, typename Position, typename Traits>

typedef std::input_iterator_tag BALL::BaseIterator< Container, DataType, Position, Traits >::iterator_category

Definition at line 82 of file baseIterator.h.

## pointer

template<typename Container, typename DataType, typename Position, typename Traits>

typedef const DataType* BALL::BaseIterator< Container, DataType, Position, Traits >::pointer

Definition at line 78 of file baseIterator.h.

## reference

template<typename Container, typename DataType, typename Position, typename Traits>

typedef const DataType& BALL::BaseIterator< Container, DataType, Position, Traits >::reference

Definition at line 80 of file baseIterator.h.

## value_type

template<typename Container, typename DataType, typename Position, typename Traits>

typedef DataType BALL::BaseIterator< Container, DataType, Position, Traits >::value_type

Definition at line 74 of file baseIterator.h.

## Constructor & Destructor Documentation

## BaseIterator() [1/3]

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE BALL::BaseIterator< Container, DataType, Position, Traits >::BaseIterator | ( |  | ) |

inline

Default constructor.

Definition at line 89 of file baseIterator.h.

## BaseIterator() [2/3]

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE BALL::BaseIterator< Container, DataType, Position, Traits >::BaseIterator | ( | const BaseIterator< Container, DataType, Position, Traits > & | iterator | ) |

inline

Copy constructor.

Definition at line 92 of file baseIterator.h.

## ~BaseIterator()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE BALL::BaseIterator< Container, DataType, Position, Traits >::~BaseIterator | ( |  | ) |

inline

Destructor.

Definition at line 98 of file baseIterator.h.

## BaseIterator() [3/3]

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE BALL::BaseIterator< Container, DataType, Position, Traits >::BaseIterator | ( | const Container & | container | ) |

inline protected

Constructor. Protected to allow instantiation and use in derived classes only.

Definition at line 189 of file baseIterator.h.

## Member Function Documentation

## getContainer()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE const Container * BALL::BaseIterator< Container, DataType, Position, Traits >::getContainer | ( |  | ) | const

inline

Get a constant pointer to the container of this iterator.

Definition at line 136 of file baseIterator.h.

## getTraits() [1/2]

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE Traits & BALL::BaseIterator< Container, DataType, Position, Traits >::getTraits | ( |  | ) |

inline

Get a constant reference to the traits of this iterator.

Definition at line 133 of file baseIterator.h.

## getTraits() [2/2]

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE const Traits & BALL::BaseIterator< Container, DataType, Position, Traits >::getTraits | ( |  | ) | const

inline

Get a constant reference to the traits of this iterator.

Definition at line 130 of file baseIterator.h.

## invalidate()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE void BALL::BaseIterator< Container, DataType, Position, Traits >::invalidate | ( |  | ) |

inline

Invalidate the iterator.

Definition at line 124 of file baseIterator.h.

## isSingular()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE bool BALL::BaseIterator< Container, DataType, Position, Traits >::isSingular | ( |  | ) | const

inline

Singularity predicate. This method returns true if the iterator is singular, i.e., not associated with a container.

Definition at line 170 of file baseIterator.h.

## isValid()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE bool BALL::BaseIterator< Container, DataType, Position, Traits >::isValid | ( |  | ) | const

inline

Validity predicate

Returns
  true if the iterator is valid (pointing at an element in a container)

Definition at line 175 of file baseIterator.h.

## operator const Position &()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE BALL::BaseIterator< Container, DataType, Position, Traits >::operator const Position & | ( |  | ) | const

inline

Convert an iterator to Position. This method returns the position of the iterator. Note that Position is a template within this context and not the BALL datatype.

Definition at line 147 of file baseIterator.h.

## operator!=()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE bool BALL::BaseIterator< Container, DataType, Position, Traits >::operator!= | ( | const BaseIterator< Container, DataType, Position, Traits > & | iterator | ) | const

inline

Inequality operator.

Definition at line 164 of file baseIterator.h.

## operator*()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE reference BALL::BaseIterator< Container, DataType, Position, Traits >::operator* | ( |  | ) | const

inline

Convert an iterator to its Datatype by returning a reference to the current data.

Definition at line 150 of file baseIterator.h.

## operator+()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE bool BALL::BaseIterator< Container, DataType, Position, Traits >::operator+ | ( |  | ) | const

inline

Validity predicate.

Definition at line 178 of file baseIterator.h.

## operator-()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE bool BALL::BaseIterator< Container, DataType, Position, Traits >::operator- | ( |  | ) | const

inline

Invalidity perdicate.

Definition at line 181 of file baseIterator.h.

## operator->()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE pointer BALL::BaseIterator< Container, DataType, Position, Traits >::operator-> | ( |  | ) | const

inline

Return a pointer to the current data.

Definition at line 153 of file baseIterator.h.

## operator=()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE BaseIterator & BALL::BaseIterator< Container, DataType, Position, Traits >::operator= | ( | const BaseIterator< Container, DataType, Position, Traits > & | iterator | ) |

inline

Assignment operator. Assigns the contents of an iterator to another iterator.

Parameters

  iterator | the iterator to be copied

Definition at line 109 of file baseIterator.h.

## operator==()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE bool BALL::BaseIterator< Container, DataType, Position, Traits >::operator== | ( | const BaseIterator< Container, DataType, Position, Traits > & | iterator | ) | const

inline

Equality operator.

Definition at line 161 of file baseIterator.h.

## setTraits()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE void BALL::BaseIterator< Container, DataType, Position, Traits >::setTraits | ( | const Traits & | traits | ) |

inline

Set the traits.

Definition at line 127 of file baseIterator.h.

## swap()

template<typename Container, typename DataType, typename Position, typename Traits>

BALL_INLINE void BALL::BaseIterator< Container, DataType, Position, Traits >::swap | ( | BaseIterator< Container, DataType, Position, Traits > & | iterator | ) |

inline

Swap two iterators.

Definition at line 116 of file baseIterator.h.