RWTPtrDlistIterator<T>

Alternative interface: no Standard C++ Library

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• Public Constructor
• Public Member Operators
• Public Member Functions

Member Functions
container() findNext() insertAfterPoint() key() operator()() operator++() operator+=() operator--() operator-=() remove()	removeNext() reset()

#include <rw/tpdlist.h>
RWTPtrDlist<T> list;
RWTPtrDlistIterator<T> iterator(list);

Iterator for class RWTPtrDlist<T>, allowing sequential access to all the elements of a doubly-linked parameterized list. Elements are accessed in order, in either direction.

Like all Rogue Wave iterators, the "current item" is undefined immediately after construction -- you must define it by using operator() or some other (valid) operation.

Once the iterator has advanced beyond the end of the collection it is no longer valid -- continuing to use it will bring undefined results.

None

#include<rw/tpdlist.h>
#include<iostream.h>
#include<rw/cstring.h>

int main(){
   RWTPtrDlist<RWCString> a;
   RWTPtrDlistIterator<RWCString> itr(a);
   a.insert(new RWCString("John"));
   a.insert(new RWCString("Steve"));
   a.insert(new RWCString("Mark"));
   a.insert(new RWCString("Steve"));
   for(;itr();)
     cout << *itr.key() <<endl;
   return 0;
}

Program Output
John
Steve
Mark
Steve

RWTPtrDlistIterator<T>(RWTPtrDlist<T>& c);

Constructs an iterator to be used with the list c.

RWBoolean
operator++();

Advances the iterator to the next item and returns TRUE. When the end of the collection is reached, returns FALSE and the position of the iterator will be undefined.

RWBoolean
operator--();

Retreats the iterator to the previous item and returns TRUE. When the beginning of the collection is reached, returns FALSE and the position of the iterator will be undefined.

RWBoolean
operator+=(size_t n);

Advances the iterator n positions and returns TRUE. When the end of the collection is reached, returns FALSE and the position of the iterator will be undefined.

RWBoolean
operator-=(size_t n);

Retreats the iterator n positions and returns TRUE. When the beginning of the collection is reached, returns FALSE and the position of the iterator will be undefined.

T*
operator()();

Advances the iterator to the next item and returns a pointer to it. When the end of the collection is reached, returns nil and the position of the iterator will be undefined.

RWTPtrDlist<T>*
container() const;

Returns a pointer to the collection over which this iterator is iterating.

T*
findNext(const T* a);

Advances the iterator to the first element that is equal to the object pointed to by a and returns a pointer to it. If no item is found, returns nil and the position of the iterator will be undefined. Equality is measured by the class-defined equality operator for type T.

T*
findNext(RWBoolean (*testFun)(T*, void*), void*);

Advances the iterator to the first element for which the tester function pointed to by testFun returns TRUE and returns a pointer to it. If no item is found, returns nil and the position of the iterator will be undefined.

void
insertAfterPoint(T* a);

Inserts the object pointed to by a into the iterator's associated collection in the position immediately after the iterator's current position which remains unchanged.

T*
key() const;

Returns a pointer to the object at the iterator's current position. The results are undefined if the iterator is no longer valid.

T*
remove();

Removes and returns the object at the iterator's current position from the iterator's associated collection. Afterwards, the iterator will be positioned at the element immediately before the removed element. Returns nil if unsuccessful in which case the position of the iterator is undefined. If the first element of the iterator's associated collection is removed, then the position of the iterator will be undefined.

T*
removeNext(const T* a);

Advances the iterator to the first element that is equal to the object pointed to by a, then removes and returns it. Afterwards, the iterator will be positioned at the element immediately before the removed element. Returns nil if unsuccessful in which case the position of the iterator is undefined. Equality is measured by the class-defined equality operator for type T.

T*
removeNext(RWBoolean (*testFun)(T*, void*), void*);

Advances the iterator to the first element for which the tester function pointed to by testFun returns TRUE, then removes and returns it. Afterwards, the iterator will be positioned at the element immediately before the removed element. Returns nil if unsuccessful in which case the position of the iterator is undefined.

void
reset();

Resets the iterator to the state it had immediately after construction.

void
reset(RWTPtrDlist<T>& c);

Resets the iterator to iterate over the collection c.