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Logtalk - Open source object-oriented logic programming language
Release 2.30.7

Copyright (c) 1998-2007 Paulo Moura.  All Rights Reserved.
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To load this example and for sample queries, please see the SCRIPT file.

You will also need to load the following files in the library directory: 
dates_loader, types_loader, events_loader, metapredicates_loader, and 
hierarchies_loader. Alternatively, you can just load the library all_loader 
file.

Some of the code in this folder is adopted, with permission, from the book 
"Prolog Programming for Artificial Intelligence" by Ivan Bratko.

For a description of the search problems, please see a classical AI book 
(such as the one above) or visit the url <http://www.plastelina.net/games>.

This example defines two hierarchies of objects, one for representing 
state-spaces and another for representing search methods:

	state_space
		farmer
		water_jug
		salt(Quantity, Measure1, Measure2)
		heuristic_state_space
			bridge
			eight_puzzle
			miss_cann

	search_strategy
		blind_search(Bound)
			breadth_first(Bound)
			depth_first(Bound)
		heuristic_search(Threshold)
			best_first(Threshold)
			hill_climbing(Threshold)

Taken together, these two hierarchies implement a framework for solving 
state-space search problems in Logtalk. There is also a monitor object, 
"performance", which tries to measure the time taken to find a solution, 
the branching factor while searching for a solution, and the number of 
transitions made to find a solution.