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/********************* */
/*! \file sequences.cpp
** \verbatim
** Top contributors (to current version):
** Andres Noetzli
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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.\endverbatim
**
** \brief Reasoning about sequences with CVC4 via C++ API.
**
** A simple demonstration of reasoning about sequences with CVC4 via C++ API.
**/
#include <cvc4/api/cvc4cpp.h>
#include <iostream>
using namespace CVC4::api;
int main()
{
Solver slv;
// 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");
// Set output language to SMTLIB2
slv.setOption("output-language", "smt2");
// Sequence sort
Sort intSeq = slv.mkSequenceSort(slv.getIntegerSort());
// Sequence variables
Term x = slv.mkConst(intSeq, "x");
Term y = slv.mkConst(intSeq, "y");
// Empty sequence
Term empty = slv.mkEmptySequence(slv.getIntegerSort());
// Sequence concatenation: x.y.empty
Term concat = slv.mkTerm(SEQ_CONCAT, x, y, empty);
// Sequence length: |x.y.empty|
Term concat_len = slv.mkTerm(SEQ_LENGTH, concat);
// |x.y.empty| > 1
Term formula1 = slv.mkTerm(GT, concat_len, slv.mkReal(1));
// Sequence unit: seq(1)
Term unit = slv.mkTerm(SEQ_UNIT, slv.mkReal(1));
// x = seq(1)
Term formula2 = slv.mkTerm(EQUAL, x, unit);
// Make a query
Term q = slv.mkTerm(AND, formula1, formula2);
// check sat
Result result = slv.checkSatAssuming(q);
std::cout << "CVC4 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;
}
}
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