[PPL-devel] [GIT] ppl/ppl(master): Added a test for problem feasibility when incrementally adding parameter constraints .

[François Galea]

Module: ppl/ppl
Branch: master
Commit: c4b4cb73d97dc1e901f486c7693c342acff62484
URL:    http://www.cs.unipr.it/git/gitweb.cgi?p=ppl/ppl.git;a=commit;h=c4b4cb73d97dc1e901f486c7693c342acff62484

Author: François Galea <francois.galea at uvsq.fr>
Date:   Thu Mar  4 14:14:05 2010 +0100

Added a test for problem feasibility when incrementally adding parameter constraints.

---

 tests/PIP_Problem/pipproblem1.cc |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/tests/PIP_Problem/pipproblem1.cc b/tests/PIP_Problem/pipproblem1.cc
index 64deaa0..f8c0821 100644
--- a/tests/PIP_Problem/pipproblem1.cc
+++ b/tests/PIP_Problem/pipproblem1.cc
@@ -634,6 +634,38 @@ test21() {
   return ok;
 }
 
+bool
+test22() {
+  // Same problem as test02, but incrementally adding two parameter constraints
+  // making the problem infeasible.
+  Variable i(0);
+  Variable j(1);
+  Variable n(2);
+  Variable m(3);
+  Variables_Set params(n, m);
+
+  Constraint_System cs;
+  cs.insert(3*j >= -2*i+8);
+  cs.insert(j <= 4*i - 4);
+  cs.insert(j <= m);
+  cs.insert(i <= n);
+
+  PIP_Problem pip(cs.space_dimension(), cs.begin(), cs.end(), params);
+
+  bool ok = (pip.solve() == OPTIMIZED_PIP_PROBLEM);
+  if (ok) {
+    const PIP_Tree solution = pip.solution();
+    ok &= solution->OK();
+    pip.print_solution(nout);
+  }
+
+  pip.add_constraint(7*m < 12);
+  pip.add_constraint(2*n + 3*m < 8);
+  ok &= (pip.solve() == UNFEASIBLE_PIP_PROBLEM);
+
+  return ok;
+}
+
 } // namespace
 
 BEGIN_MAIN
@@ -658,4 +690,5 @@ BEGIN_MAIN
   DO_TEST_F8(test19);
   DO_TEST(test20);
   DO_TEST(test21);
+  DO_TEST(test22);
 END_MAIN