1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
//
// Copyright (c) 2009-2017 Benjamin Kaufmann
//
// This file is part of Clasp. See http://www.cs.uni-potsdam.de/clasp/
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
// Add the libclasp directory to the list of
// include directories of your build system.
#include <clasp/clasp_facade.h>
#include <clasp/solver.h>
#include "example.h"
// This example uses the ClaspFacade to compute
// the stable models of the program
// a :- not b.
// b :- not a.
//
// The ClaspFacade is a convenient wrapper for the services of the clasp library.
// See clasp_facade.h for details.
// In order to get models from the ClaspFacade, we must provide a suitable
// event handler.
class ModelPrinter : public Clasp::EventHandler {
public:
ModelPrinter() {}
bool onModel(const Clasp::Solver& s, const Clasp::Model& m) {
printModel(s.outputTable(), m);
return true;
}
};
void addSimpleProgram(Clasp::Asp::LogicProgram& prg) {
Potassco::Atom_t a = prg.newAtom();
Potassco::Atom_t b = prg.newAtom();
Potassco::RuleBuilder rb;
prg.addRule(rb.start().addHead(a).addGoal(Potassco::neg(b)));
prg.addRule(rb.start().addHead(b).addGoal(Potassco::neg(a)));
prg.addOutput("a", a);
prg.addOutput("b", b);
}
void example2() {
// Aggregates configuration options.
// Using config, you can control many parts of the search, e.g.
// - the amount and kind of preprocessing
// - the enumerator to use and the number of models to compute
// - the heuristic used for decision making
// - the restart strategy
// - ...
Clasp::ClaspConfig config;
// We want to compute all models but
// otherwise we use the default configuration.
config.solve.numModels = 0;
// The "interface" to the clasp library.
Clasp::ClaspFacade libclasp;
// LogicProgram provides the interface for defining logic programs.
// The returned object is already setup and ready to use.
// See logic_program.h for details.
Clasp::Asp::LogicProgram& asp = libclasp.startAsp(config);
addSimpleProgram(asp);
// We are done with problem setup.
// Prepare the problem for solving.
libclasp.prepare();
// Start the actual solving process.
ModelPrinter printer;
libclasp.solve(&printer);
std::cout << "No more models!" << std::endl;
}
|
