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96 lines
4.6 KiB
Text
96 lines
4.6 KiB
Text
========================================
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========================================
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libCSP++ is a small library whose purpose is allowing the programmer who has to
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manage constraint-related problems (CSP == Constraint Satisfaction Problem), in
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artificial intelligence or any other application, to do it easily, just caring
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about how to express the constraints of his own problem, not how to write an
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algorithm that verifies those constraints. The programmer only has to focus
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three parameters: the variables of the problem (e.g., in a sudoku resolution
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algorithm, each cell of the game may represent a variable), the domains of these
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variables (e.g., in a sudoku, each cell may assume values from 1 to 9) and the
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constraints of the problem, simply provided like one or more boolean functions
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(always in a sudoku, the constraints are represented by a boolean function
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returning true if all the variables in the same row, column and cell have
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different values, false otherwise). Once focused these features, the programmer
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just has to provide them to build a CSP object, without caring of the algorithm
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to check the satisfiability of his problem, and so pay his attention to *HIS*
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own algorithm.
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INSTALLATION:
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Just type make install. The files will be copied, by default, to /usr/local.
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Change the Makefile if you want them in a different location. No additional
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dependency is required. Only a C++ compiler.
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USAGE:
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Just include <csp++/csp++.h> in your source files using libCSP++, possibly
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adding the directory where csp++ directory is located to your include list (for
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example, using g++ and supposing you installed csp++ to /usr/local, you would
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append -I/usr/local/include to your compiler command line).
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DOCUMENTATION:
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You can find doxygen-generated documentation, both in HTML and LaTeX format, in
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the doc/ directory of the project. If you modify some of the sources files of
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the library and want to change the documentation, just move to csp++ directory
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and launch `doxygen' command again.
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EXAMPLES:
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Two examples of usage of the library are provided.
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- fourcolours.cpp is a simple application whose purpose is to interactively ask the
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user to enter the colours for some European countries. The constraint is that two
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adjacent countries on the map cannot have the same colour, and the domain of
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each variable (country) is the set of colours it can assume (a set of 4 colours
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is used, it has been proved in the chromatic theory of graphs that 4 colours are
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enough for satisfying the constraint "two adjacent countries must always have
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different colours"). Every time the user inserts the colour for a country, the
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domains (colours) of the remaining countries are computed again applying the
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constraint just entered by the user, and for the next countries the choice of
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the colours is only restricted to these computed domains. If the user has to
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choose a colour for a country having an only value left in its domain, that
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value will be chosen automatically.
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- sudoku.cpp is a nice program that automatically solves a sudoku, theoretically by
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any size (in truth the complexity of the algorithm rises exponentially when the
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size of the sudoku grows, and the required time for the algorithm is also
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inversely proportional to the number of variables already set by default in the
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game). The sudoku to be solved is read by a text file. If no file is provided,
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the program reads the sudoku contained in ./sudoku.txt. More examples are
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provided in files sudoku-easy.txt, sudoku-medium.txt, sudoku-hard.txt and
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sudoku-2x2x2.txt. If you want to solve a sudoku different by the one provided in
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sudoku.txt, just put the new sudoku in a file whose structure is similar to the
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one illustrated in the sample files, and pass it as parameter for the
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application (e.g. ./sudoku mysudoku.txt). The application will verify whether
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the given game has a solution (unique), is indeterminate (the given variables
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are not enough for reaching a unique solution) or impossible (any configuration
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leads to a violation of the constraints).
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For building the examples, from the root directory of the project just type
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`make examples'. For removing them, type `make examples-clean'. For building
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only one of them, type `make fourcolours' or `make sudoku', and specularly `make
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fourcolours-clean' or `make sudoku-clean'.
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LICENCE:
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All the source code and examples are released under GNU GPL 3 licence.
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AUTHOR:
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BlackLight, <blacklight[AT]autistici[DOT]org>, http://0x00.ath.cx
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