interfaces fixes and cleanups...and examples of each interface!

1 files changed, 64 insertions, 0 deletions

diff --git a/examples/simple_vc_compat_cxx.cpp b/examples/simple_vc_compat_cxx.cpp
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+/*********************                                                        */
+/*! \file simple_vc_compat_cxx.cpp
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010, 2011  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief A simple demonstration of the C++ compatibility interface
+ ** (quite similar to the old CVC3 C++ interface)
+ **
+ ** A simple demonstration of the C++ compatibility interface (quite
+ ** similar to the old CVC3 C++ interface).  Note that the library is
+ ** named "libcvc4compat," to mark it as being part of CVC4, but the
+ ** header file is "cvc3_compat.h" to indicate the similarity to the
+ ** CVC3 interface, and the namespace is "CVC3".  CVC3::Expr and
+ ** CVC4::Expr are incompatible; to avoid confusion, it is best to not
+ ** include both the CVC3 and CVC4 interface headers.
+ **/
+
+#include <iostream>
+
+// #include <cvc4/compat/cvc3_compat.h>
+#include "compat/cvc3_compat.h"
+
+using namespace std;
+using namespace CVC3;
+
+int main() {
+  ValidityChecker* vc = ValidityChecker::create();
+
+  // Prove that for integers x and y:
+  //   x > 0 AND y > 0  =>  2x + y >= 3
+
+  Type integer = vc->intType();
+
+  Expr x = vc->varExpr("x", integer);
+  Expr y = vc->varExpr("y", integer);
+  Expr zero = vc->ratExpr(0);
+
+  Expr x_positive = vc->gtExpr(x, zero);
+  Expr y_positive = vc->gtExpr(y, zero);
+
+  Expr two = vc->ratExpr(2);
+  Expr twox = vc->multExpr(two, x);
+  Expr twox_plus_y = vc->plusExpr(twox, y);
+
+  Expr three = vc->ratExpr(3);
+  Expr twox_plus_y_geq_3 = vc->geExpr(twox_plus_y, three);
+
+  Expr formula = vc->impliesExpr(vc->andExpr(x_positive, y_positive),
+                                twox_plus_y_geq_3);
+
+  cout << "Checking validity of formula " << formula << " with CVC4." << endl;
+  cout << "CVC4 should report VALID." << endl;
+  cout << "Result from CVC4 is: " << vc->query(formula) << endl;
+
+  return 0;
+}