9fe4d26c59
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1539 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
179 lines
5.0 KiB
Plaintext
179 lines
5.0 KiB
Plaintext
=================================================================
|
|
Logtalk - Object oriented extension to Prolog
|
|
Release 2.27.0
|
|
|
|
Copyright (c) 1998-2006 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 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
|