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=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.27.0
Copyright (c) 1998-2006 Paulo Moura. All Rights Reserved.
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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 instructions on how to load the example and
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. See the NOTES
files inside the library folder, plus the NOTES and SCRIPT files 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 or 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 or to solve
multi-inheritance conflicts
assignvars
example of using assignable variables in the context of parametric objects
benchmarks
simple benchmarks for helping measuring performance of Logtalk message
sending between Prolog compilers and for comparing performance of message
sending calls with predicate calls in plain Prolog
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; i.e. shared instance variables)
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
encodings
very simple example of using the new, experimental encoding/1
directive (requires Logtalk to be run with the SWI-Prolog compiler)
engines
example of category composition (importation of categories by other
categories) using car engines
errors
example showing the Logtalk compiler warning and error reporting
for common programming errors
hello_world
the unavoidable "hello world" programming example
hooks
simple example of using compiler hook predicates
inheritance
examples of public, protected, and private inheritance using 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 first-order predicate logic propositions
to conjunctive normal form and to clausal 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
modules
simple example of compiling Prolog module files as objects
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