* tgbaalgos/emptiness_stats.hh (unsigned_statistics): New base

class for ec_statistics and ars_statistics.
(acss_statistics): Inherit from ars_statistics.
* tgbaalgos/emptiness.cc, tgbaalgos/emptiness.hh:
(emptiness_check::statistics, emptiness_check_result::statistics):
New methods.
* tgbatest/randtgba.cc: Adjust to use the above.
* tgbaalgos/gv04.cc, tgbaalgos/ndfs_result.hxx, tgbaalgos/gtec/ce.cc,
tgbaalgos/gtec/ce.hh: Do not inherit from ars_statistics if
acss_statistics is used.

src/tgbaalgos/emptiness.cc

@@ -1,4 +1,4 @@
-// Copyright (C) 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
+// Copyright (C) 2004, 2005  Laboratoire d'Informatique de Paris 6 (LIP6),
 // département Systèmes Répartis Coopératifs (SRC), Université Pierre
 // et Marie Curie.
 //
@@ -100,10 +100,22 @@ namespace spot
     return 0;
   }
 
+  const unsigned_statistics*
+  emptiness_check_result::statistics() const
+  {
+    return dynamic_cast<const unsigned_statistics*>(this);
+  }
+
   emptiness_check::~emptiness_check()
   {
   }
 
+  const unsigned_statistics*
+  emptiness_check::statistics() const
+  {
+    return dynamic_cast<const unsigned_statistics*>(this);
+  }
+
   std::ostream&
   emptiness_check::print_stats(std::ostream& os) const
   {