Class: PrototypeLookupAlgorithm

• Inheritance
• Description
• Related information
• Class protocol
  • instance creation
• Instance protocol
  • lookup
• Examples

Inheritance:

   Object
   |
   +--PrototypeLookupAlgorithm

Package:

stx:libbasic

Category:

Kernel-Classes

Version:

rev: ? date: ? ?

user: ?

file: ? directory: libbasic

module: stx stc-classLibrary: libbasic

Author:

cg (cg@CG-PC)

Description:

this is a dummy lookupAlgorithm class to demonstrate the meta-object-protoocol support.
Create a sumclass of me, redefine the lookupmethod to return a method proper.
If it returns nil, a doesNotUnderstand will be sent, as usual.

This class does nothing real - it duplicates the algorithm as found in the VM.

Related information:

    jan
    Vrany's
    paper
    on
    Smalltalk's
    Meta-Object-Protocol
    proposal.

Class protocol:

 new

Instance protocol:

 lookupMethodForSelector: aSelector directedTo: searchClass for: aReceiver withArguments: argArrayOrNil from: sendingContext

invoked by the VM to ask me for a method to call.
The arguments are: the selector, receiver and arguments,
the class to start the search in (for here-, super and directed sends)
the sending context.

The returned method object will be put into the inline- and polyCache
at the call site; it might therefore be called more than once for the
same receiver-class/selector combination (once for each call site).
If I return nil, a doesNotUnderstand will be invoked.

Examples: