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
|
/******************************************************************************
* Top contributors (to current version):
* Aina Niemetz, Andres Noetzli, Tianyi Liang
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2025 by the authors listed in the file AUTHORS
* in the top-level source directory and their institutional affiliations.
* All rights reserved. See the file COPYING in the top-level source
* directory for licensing information.
* ****************************************************************************
*
* A simple demonstration of reasoning about sequences via the C++ API.
*/
#include <cvc5/cvc5.h>
#include <iostream>
using namespace cvc5;
int main()
{
TermManager tm;
Solver slv(tm);
// Set the logic
slv.setLogic("QF_SLIA");
// Produce models
slv.setOption("produce-models", "true");
// The option strings-exp is needed
slv.setOption("strings-exp", "true");
// Sequence sort
Sort intSeq = tm.mkSequenceSort(tm.getIntegerSort());
// Sequence variables
Term x = tm.mkConst(intSeq, "x");
Term y = tm.mkConst(intSeq, "y");
// Empty sequence
Term empty = tm.mkEmptySequence(tm.getIntegerSort());
// Sequence concatenation: x.y.empty
Term concat = tm.mkTerm(Kind::SEQ_CONCAT, {x, y, empty});
// Sequence length: |x.y.empty|
Term concat_len = tm.mkTerm(Kind::SEQ_LENGTH, {concat});
// |x.y.empty| > 1
Term formula1 = tm.mkTerm(Kind::GT, {concat_len, tm.mkInteger(1)});
// Sequence unit: seq(1)
Term unit = tm.mkTerm(Kind::SEQ_UNIT, {tm.mkInteger(1)});
// x = seq(1)
Term formula2 = tm.mkTerm(Kind::EQUAL, {x, unit});
// Make a query
Term q = tm.mkTerm(Kind::AND, {formula1, formula2});
// check sat
Result result = slv.checkSatAssuming(q);
std::cout << "cvc5 reports: " << q << " is " << result << "." << std::endl;
if (result.isSat())
{
std::cout << " x = " << slv.getValue(x) << std::endl;
std::cout << " y = " << slv.getValue(y) << std::endl;
}
}
|
