Class: VirtualArray

• Inheritance
• Description
• Related information
• Instance protocol
  • accessing
  • collection protocol
  • inspecting
  • queries
• Examples

Inheritance:

   Object
   |
   +--Collection
      |
      +--SequenceableCollection
         |
         +--VirtualArray

Package:

stx:libbasic2

Category:

Collections-Arrayed

Version:

rev: 1.9 date: 2017/02/22 18:02:05

user: cg

file: VirtualArray.st directory: libbasic2

module: stx stc-classLibrary: libbasic2

Author:

Claus Gittinger

Description:

An Array which computes its values on demand and does NOT remember those values.
Use this to present huge files/hex dumps to a text editor.

Related information:

    LazyArray

Instance protocol:

 generator

the element value generator; a block which gets the index as argument

 generator: aBlock

set the element value generator; a block which gets the index as argument

 setSize: anInteger

 size

the virtual size

 at: index

(comment from inherited method)
return the indexed instance variable with index, anInteger;
this method can be redefined in subclasses.

 at: index put: value

(comment from inherited method)
store the 2nd arg, anObject as indexed instvar with index, anInteger.
this method can be redefined in subclasses. Returns anObject (sigh)

 grow: howBig

change the receiver's size

 displayOn: aGCOrStream

print a representation of the receiver on aGCOrStream for display in inspectors etc.

 species

return the type of collection to be returned by collect, select etc.

Examples:

    |squaresLines|

    squaresLines := VirtualArray new.
    squaresLines generator:[:index | index squared printString].
    squaresLines setSize:100000.

    squaresLines inspect.
    TextView openWith:squaresLines