### IASequence

  A sequence is an ordered collection of elements. The elements are arranged so that each collection has a first and a last element, each element except the last has a next element, and each element but the first has a previous element.

  The type and value of the elements are irrelevant, and have no effect on the behavior of the collection. Elements can be added and deleted from any position in the collection. Elements can be retrieved or replaced. A sequence does not support element equality or a key. If you require element equality for a sequence, you can use an equality sequence.

### IASequence - Member Functions and Data by Group

### Constructors & Destructor

You can construct and destruct objects of this class.

~IASequence

      public:
      ~IASequence()

  Removes all elements from the collection. Destructors are called for all elements contained in the collection and for elements that have been constructed in advance.

  Side Effects

  All cursors of the collection become undefined.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | Yes

IASequence

  You can construct and destruct objects of this class.

  Overload 1

      public:
      IASequence(INotifier&)

  Use this constructor to create a collection with support for notification.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | Yes

  Overload 2

      protected:
      IASequence(IASequence < Element > const&)

  Constructs a collection. The collection is unbounded and is initially empty.
  Note: The collection constructor does not define whether any elements are constructed when the collection is constructed. For some classes, the element's default constructor may be invoked when the collection's constructor is invoked. This happens if a tabular or a diluted sequence implementation variant is used for a collection. The element's default constructor is used to allocate the required storage and initialize the elements. Therefore, a default constructor must be available for elements in such cases.

  Exception

  IOutOfMemory

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | Yes

  Overload 3

      protected:
      IASequence()

  The default constructor.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | Yes

### Comparison

Use these members to compare two elements in a given sequence.

compare

      public:
      long
        compare( IASequence < Element > const&,
                 long ( * comparisonFunction ) ( Element const & ,
                 Element const & ) ) const

  Compares the collection with the given collection. Comparison yields <0 if the collection is less than the given collection, 0 if the collection is equal to the given collection, and >0 if the collection is greater than the given collection. Comparison is defined by the first pair of corresponding elements, in both collections, that are not equal. If such a pair exists, the collection with the greater element is the greater one. Otherwise, the collection with more elements is the greater one.
  Note:

  1. The given comparison function must return a result according to the following rules:
     >0
       if (element1 > element2)
     0
       if (element1 == element2)
     <0
       if (element1 < element2)
  2. For elements of type char*, compare() is not locale-sensitive by default. Because it uses strcmp() and not strcoll(), it compares the binary values representing the characters, and is not based on the LC_COLLATE category of the current locale. Its results are reliable only for code pages and character sets in which the collating sequence matches the sequence of binary representations. If you need a comparison based on the LC_COLLATE cateogory, then you must implement your own compare() function as described in Using Separate Functions:elink. in the Class Library User's Guide.

  Return Value

  Returns the result of the collection comparison.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | Yes

### IASequence - Inherited Member Functions and Data

#### Inherited Public Functions

  IACollection

  -     virtual ~IACollection()

  -     virtual bool add(Element const&, ICursor&)

  -     virtual bool add(Element const&)

  -     virtual void addAllFrom(IACollection < Element > const&)

  -     void adoptStreamer(IACollectionStreamer*)

  -     bool
          allElementsDo( bool ( * applicatorFunction ) ( Element const&,
                         void * ) , void* additionalArgument = 0 ) const

  -     bool allElementsDo(IConstantApplicator < Element >&) const

  -     bool allElementsDo(IApplicator < Element >&)

  -     bool
          allElementsDo( bool ( * applicatorFunction ) ( Element&,
                         void * ) , void* additionalArgument = 0 )

  -     Element const& anyElement() const

  -     virtual void copy(IACollection < Element > const&)

  -     INotifier& disableNotification()

  -     Element& elementAt(ICursor const&)

  -     Element const& elementAt(ICursor const&) const

  -     INotifier& enableNotification(bool = true)

  -     IACollection(INotifier&)

  -     bool isBounded() const

  -     bool isConsistent() const

  -     bool isEmpty() const

  -     bool isEnabledForNotification() const

  -     bool isFull() const

  -     INumber maxNumberOfElements() const

  -     virtual ICursor* newCursor() const

  -     ICursor* newMngCursor() const

  -     INotifier& notifier()

  -     INotifier const& notifier() const

  -     INotifier& notifyObservers(INotificationEvent const&)

  -     INumber numberOfElements() const

  -     virtual void operator <<=(IDataStream&)

  -     virtual void operator >>=(IDataStream&)

  -     operator INotifier &() const

  -     virtual INumber
          removeAll( bool ( * predicateFunction ) ( Element const&,
                     void * ) , void* additionalArgument = 0 )

  -     virtual INumber removeAll()

  -     virtual void removeAt(ICursor&)

  -     virtual void replaceAt(ICursor const&, Element const&)

  -     bool setToFirst(ICursor&) const

  -     bool setToNext(ICursor&) const

  IAOrderedCollection

  -     ~IAOrderedCollection()

  -     Element const& firstElement() const

  -     IAOrderedCollection(INotifier&)

  -     bool isFirst(ICursor const&) const

  -     bool isFirstAt(ICursor const&) const

  -     bool isLast(ICursor const&) const

  -     bool isLastAt(ICursor const&) const

  -     Element const& lastElement() const

  -     IPosition position(ICursor const&) const

  -     IPosition positionAt(ICursor const&) const

  -     virtual void removeAtPosition(IPosition)

  -     virtual void removeFirst()

  -     virtual void removeLast()

  -     bool setToLast(ICursor&) const

  -     void setToPosition(IPosition, ICursor&) const

  -     bool setToPrevious(ICursor&) const

  IASequentialCollection

  -     ~IASequentialCollection()

  -     virtual void addAsFirst(Element const&)

  -     virtual void addAsFirst(Element const&, ICursor&)

  -     virtual void addAsLast(Element const&, ICursor&)

  -     virtual void addAsLast(Element const&)

  -     virtual void addAsNext(Element const&, ICursor&)

  -     virtual void addAsPrevious(Element const&, ICursor&)

  -     virtual void
          addAtPosition( IPosition,
                         Element const&,
                         ICursor& )

  -     virtual void addAtPosition(IPosition, Element const&)

  -     Element& any()

  -     Element const& any() const

  -     Element const& elementAtPosition(IPosition) const

  -     Element& elementAtPosition(IPosition)

  -     Element& first()

  -     Element const& first() const

  -     IASequentialCollection(INotifier&)

  -     Element const& last() const

  -     Element& last()

  -     virtual void reverse()

  -     virtual void
          sort( long ( * comparisonFunction ) ( Element const & ,
                Element const & ) )

#### Inherited Public Data

  - None

#### Inherited Protected Functions

  IACollectionBase

  -     ~IACollectionBase()

  -     static ICursorImpl& CrsrImplOf(ICursor& cursor)

  -     static ICursorImpl const& CrsrImplOf(ICursor const& cursor)

  -     IACollectionBase()

  -     IACollectionBase(IACollectionBase const&)

  -     static ICursor* InterfaceFor(ICursorImpl* cursor)

  IACollection

  -     IACollection(IACollection < Element > const&)

  -     IACollection()

  -     static Implementation&
          ImplOf( IACollection < Element > const& )

  IAOrderedCollection

  -     IAOrderedCollection(IAOrderedCollection < Element > const&)

  -     IAOrderedCollection()

  IASequentialCollection

  -     IASequentialCollection()

  -     IASequentialCollection( IASequentialCollection < Element > const& )

#### Inherited Protected Data

  - None