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yap-6.3/Logtalk/examples/NOTES
pmoura 5f5589e8de Logtalk 2.21.6 files.
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=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.6
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
This folder contains several examples of Logtalk programs. A brief
description of each example is included below.
Each example folder contains a NOTES file and a loader helper file which
may be used to load all the example entities. In addition, most examples
contain a SCRIPT file with sample queries for your to try.
Most of these examples need objects, protocols, and categories which are
defined in the Logtalk standard library or in other examples, so you
should load them first (see the NOTES files inside the library folder and
the NOTES file inside each example folder).
Some examples may redefine objects already loaded from other examples.
You may want to restart Logtalk after trying each example.
Some of the examples code have been adopted from public available Prolog
code and from known Prolog text books and are copyrighted by the respective
authors.
These are programming examples, meaning that you should study the source
files to fully understand them.
All examples are formatted using four spaces tabs.
By default, compiling an example generates a .xml documenting file for each
compiled entity (object, category, or protocol). See the xml folder for
instructions on how to browse the .xml files for on-line reading or how to
convert the files to a print-ready format such as PDF.
Here is a short description of each included example:
aliases
example of using the alias/3 predicate directive to provide alternative
names to inherited predicates in order to improve readability
benchmarks
simple benchmarks for for helping measuring performance of Logtalk message
seding between Prolog compilers and for comparing message sending with
predicate calls in plain Prolog and with calls to modules predicates
birds
bird identification expert system
example adopted from the Adventure in Prolog Amzi! book
bricks
example of representation and handling of relations using events
classvars
example of implementation of class variables (as found in Smalltalk)
dcgs
examples of using DCG rules inside objects and categories
diamonds
examples of problems and solutions for the "diamond problem"
(multi-inheritance conflicts and ambiguities)
dynpred
example of using some of the built-in database handling methods
engines
example of category composition (importation of categories by other
categories) using car engines
errors
example showing the Logtalk compiler warning and error reporting
hello_world
the unavoidable hello world programming example
inheritance
examples of public, protected and private inheritance with both
prototypes and classes/instances
instmethods
example of instance defined methods
lo
examples adopted from the Francis G. McCabe L&O system
logic
example of a translator of logic propositions to clauses in conjunctive
normal form
lpa
examples adopted from the LPA Prolog++ system
metapredicates
example of using metapredicates in Logtalk objects
metainterpreters
some examples of simple metainterpreters
mi
multi-inheritance examples
miscellaneous
unsorted examples
msglog
example of using events and monitors for recording, replaying, and
printing user messages
operators
example of using operators local to objects and categories
parametric
simple example of parametric objects
poem
examples adopted from the Ben Staveley-Taylor POEM system
points
example adopted from SICStus Objects documentation
polygons
example of representation and handling of relations using events
profiling
examples of using of events and monitors to implement profilers
puzzles
several examples of logical puzzles
reflection
example of a simple class-based reflective system
relations
objects implementing predicates for dealing with relations and
constrained relations between objects
roots
objects, protocols and categories needed by most of the other examples
searching
state-space searching framework
example adopted from Ivan Bratko's "Prolog Programming for Artificial
Intelligence" book
shapes
geometric shapes implemented as both a prototype hierarchy and a class
hierarchy
sicstus
examples adopted from SICStus Objects documentation
symdiff
example of using parametric objects to implement symbolic expression
differentiation and simplification
viewpoints
example on how to implement property and value sharing with prototypes