b697f3d34e
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1781 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
188 lines
5.3 KiB
Plaintext
188 lines
5.3 KiB
Plaintext
=================================================================
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Logtalk - Object oriented extension to Prolog
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Release 2.29.3
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Copyright (c) 1998-2007 Paulo Moura. All Rights Reserved.
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=================================================================
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This folder contains several examples of Logtalk programs. A brief
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description of each example is included below.
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Each example folder contains a NOTES file and a loader helper file which
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may be used to load all the example entities. In addition, most examples
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contain a SCRIPT file with instructions on how to load the example and
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sample queries for your to try.
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Most of these examples need objects, protocols, and categories which are
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defined in the Logtalk standard library or in other examples. See the NOTES
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files inside the library folder, plus the NOTES and SCRIPT files inside each
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example folder.
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Some examples may redefine objects already loaded from other examples.
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You may want to restart Logtalk after trying each example.
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Some of the examples code have been adopted from public available Prolog
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code or from known Prolog text books and are copyrighted by the respective
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authors.
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These are programming examples, meaning that you should study the source
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files to fully understand them. However, note that some examples purpose
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is to illustrate general principles rather than being adequate, efficient
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solutions for deployment code.
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All examples are formatted using four spaces tabs.
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By default, compiling an example generates a .xml documenting file for each
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compiled entity (object, category, or protocol). See the "xml" folder for
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instructions on how to browse the .xml files for on-line reading or how to
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convert the files to a print-ready format such as PDF.
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Here is a short description of each included example:
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aliases
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example of using the alias/3 predicate directive to provide alternative
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names to inherited predicates in order to improve readability or to solve
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multi-inheritance conflicts
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assignvars
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example of using assignable variables in the context of parametric objects
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benchmarks
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simple benchmarks for helping measuring performance of Logtalk message
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sending between Prolog compilers and for comparing performance of message
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sending calls with predicate calls in plain Prolog
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birds
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bird identification expert system
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(example adopted from the Adventure in Prolog Amzi! book)
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bricks
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example of representation and handling of relations using events
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classvars
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example of implementation of class variables
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(as found in Smalltalk; i.e. shared instance variables)
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dcgs
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examples of using DCG rules inside objects and categories
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diamonds
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examples of problems and solutions for the "diamond problem"
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(multi-inheritance conflicts and ambiguities)
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dynpred
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example of using some of the built-in database handling methods
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encodings
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very simple example of using the new, experimental encoding/1
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directive (requires Logtalk to be run with the SWI-Prolog compiler)
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engines
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example of category composition (importation of categories by other
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categories) using car engines
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errors
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example showing the Logtalk compiler warning and error reporting
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for common programming errors
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hello_world
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the unavoidable "hello world" programming example
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hooks
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simple example of using compiler hook predicates
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inheritance
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examples of public, protected, and private inheritance using both
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prototypes and classes/instances
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instmethods
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example of instance defined methods
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lo
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examples adopted from the Francis G. McCabe L&O system
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logic
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example of a translator of first-order predicate logic propositions
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to conjunctive normal form and to clausal form
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lpa
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examples adopted from the LPA Prolog++ system
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metapredicates
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example of using meta-predicates in Logtalk objects
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metainterpreters
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some examples of simple meta-interpreters defined as categories which
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may be imported by "database" objects
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mi
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multi-inheritance examples
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miscellaneous
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unsorted examples
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modules
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simple example of compiling Prolog module files as objects
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msglog
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example of using events and monitors for recording, replaying, and
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printing user messages
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operators
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example of using operators local to objects and categories
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parametric
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simple example of parametric objects
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poem
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examples adopted from the Ben Staveley-Taylor POEM system
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points
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example adopted from SICStus Objects documentation
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polygons
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example of representation and handling of relations using events
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profiling
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examples of using of events and monitors to implement profilers
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proxies
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example of using parametric object proxies
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puzzles
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several examples of logical puzzles
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reflection
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example of a simple class-based reflective system
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relations
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objects implementing predicates for dealing with relations and
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constrained relations between objects
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roots
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objects, protocols, and categories needed by most of the other examples;
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searching
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state-space searching framework
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(example adopted from Ivan Bratko's "Prolog Programming for Artificial
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Intelligence" book)
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shapes
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geometric shapes implemented as both a prototype hierarchy and a class
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hierarchy
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sicstus
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examples adopted from SICStus Objects documentation
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symdiff
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example of using parametric objects to implement symbolic expression
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differentiation and simplification
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threads
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several simple examples of multi-threading programming
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viewpoints
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example on how to implement property and value sharing with prototypes
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