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.


[view 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


[view class]
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.


[view class]
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
IAOrderedCollection
IASequentialCollection

Inherited Public Data

Inherited Protected Functions

IACollectionBase
IACollection
IAOrderedCollection
IASequentialCollection

Inherited Protected Data