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/******************************************************************************
* Top contributors (to current version):
* Abdalrhman Mohamed, Aina Niemetz, Mathias Preiner
*
* 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 the Sygus API.
*
* A simple demonstration of how to use the Sygus API to synthesize a simple
* invariant.
*/
#include <cvc5/cvc5.h>
#include <iostream>
#include "utils.h"
using namespace cvc5;
int main()
{
TermManager tm;
Solver slv(tm);
// required options
slv.setOption("sygus", "true");
slv.setOption("incremental", "false");
// set the logic
slv.setLogic("LIA");
Sort integer = tm.getIntegerSort();
Sort boolean = tm.getBooleanSort();
Term zero = tm.mkInteger(0);
Term one = tm.mkInteger(1);
Term ten = tm.mkInteger(10);
// declare input variables for functions
Term x = tm.mkVar(integer, "x");
Term xp = tm.mkVar(integer, "xp");
// (ite (< x 10) (= xp (+ x 1)) (= xp x))
Term ite =
tm.mkTerm(Kind::ITE,
{tm.mkTerm(Kind::LT, {x, ten}),
tm.mkTerm(Kind::EQUAL, {xp, tm.mkTerm(Kind::ADD, {x, one})}),
tm.mkTerm(Kind::EQUAL, {xp, x})});
// define the pre-conditions, transition relations, and post-conditions
Term pre_f =
slv.defineFun("pre-f", {x}, boolean, tm.mkTerm(Kind::EQUAL, {x, zero}));
Term trans_f = slv.defineFun("trans-f", {x, xp}, boolean, ite);
Term post_f =
slv.defineFun("post-f", {x}, boolean, tm.mkTerm(Kind::LEQ, {x, ten}));
// declare the invariant-to-synthesize
Term inv_f = slv.synthFun("inv-f", {x}, boolean);
slv.addSygusInvConstraint(inv_f, pre_f, trans_f, post_f);
// print solutions if available
if (slv.checkSynth().hasSolution())
{
// Output should be equivalent to:
// (
// (define-fun inv-f ((x Int)) Bool (not (>= x 11)))
// )
std::vector<Term> terms = {inv_f};
utils::printSynthSolutions(terms, slv.getSynthSolutions(terms));
}
return 0;
}
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