2 Using the Container Libraries

The container libraries consists of a number of fragments: container, collection, sets, classification, arrayContainer, hashTable, seqContainers, list and recList:

container.bet contains the definition of the abstract pattern container. It is the origin fragment for all the other container fragments.
collection.bet contains the definition of the abstract pattern collection. It is the origin for the sets, classification and hashTable fragments.
sets.bet contains the definition of the multiSet and set patterns. It is the origin of the classification fragment.
classification.bet contains the definition of the classificationSet pattern.
hashTable.bet contains the definition of the hashTable and extensibleHashTable patterns.
arrayContainer.bet contains the definition of the ArrayContainer pattern.
list.bet contains the definition of the list pattern.
recList.bet contains the definition of the recList pattern.
seqContainers.bet contains the definition of the abstract pattern sequentialContainer along with the stack, queue, prioQueue and deque patterns.

An application may utilize the container libraries by including the appropriate library fragment. E.g. in order for an application to utilize the multiSet pattern, the application must have the following outline:

ORIGIN '~beta/basiclib/betaenv';
INCLUDE '~beta/containers/sets'
--- program: descriptor ---
(# ...
   recordBag: @multiSet(# element:: record #);
   aRecord: @record;
   aPerson: @person; (* person is a subpattern of record *)
   ...
do ...
   recordBag.init;
   ...
   aPerson[] -> recordBag.insert;
   ...
   aRecord[] -> recordBag.insert;
   ...
   recordBag.scan(# where:: (# current.key&lt;3000 -> value #)
                 do current.print
                 #);
   (* prints all records in recordBag that has a key less that 
    * 3000. It is assumed that record implements a virtual print 
    * operation
    *)
   ...
#)

In order to utilize the other fragments, just replace

INCLUDE '~beta/containers/sets'

with e.g.

INCLUDE '~beta/containers/hashTable'

and in order to use more than one container fragment, just insert several INCLUDEs:

INCLUDE '~beta/containers/sets';
INCLUDE '~beta/containers/hashTable'

Note that since the container fragments has ORIGIN in betaenv, the above is equivalent to:

ORIGIN '~beta/containers/sets'
--- program: descriptor ---
(# ...
   recordBag: @multiSet(# element:: record #);
   ...
do ...
   ...
#)

Container Libraries - Reference Manual

[Modified: Thursday October 19^th 2000 at 12:51]