* src/tgbaalgos/emptiness_stats.hh, src/tgbaalgos/weight.cc,

src/tgbaalgos/weight.hh: New files.
* src/tgbaalgos/Makefile.am: Add them.
* src/tgbaalgos/magic.cc, src/tgbaalgos/se05.cc,
src/tgbaalgos/tau03.cc, src/tgbaalgos/tau03opt.cc,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gtec/status.cc,
src/tgbaalgos/gtec/status.hh, : Add emptiness check statistics
capability.
* src/tgbatest/randtgba.cc: Print these statistics.
* src/tgbatest/ltl2tgba.cc: tau03opt search can deal without acceptance
condition.
* src/tgbatest/emptchk.test: Test tau03opt search.

src/tgbaalgos/gtec/gtec.cc

@@ -221,6 +221,7 @@ namespace spot
 		delete todo.top().second;
 		todo.pop();
 	      }
+            set_states(ecs_->states());
 	    return new couvreur99_check_result(ecs_);
 	  }
       }
@@ -344,6 +345,7 @@ namespace spot
 			  }
 			todo.pop();
 		      }
+                    set_states(ecs_->states());
 		    return new couvreur99_check_result(ecs_);
 		  }
 	      }

src/tgbaalgos/gtec/gtec.hh

@@ -24,6 +24,7 @@
 
 #include "status.hh"
 #include "tgbaalgos/emptiness.hh"
+#include "tgbaalgos/emptiness_stats.hh"
 
 namespace spot
 {
@@ -71,7 +72,7 @@ namespace spot
   /// tgba_succ_iterators: it must compute all successors of a state
   /// at once in order to decide which to explore first, and must keep
   /// a list of all unexplored successors in its DFS stack.
-  class couvreur99_check: public emptiness_check
+  class couvreur99_check: public emptiness_check, public ec_statistics
   {
   public:
     couvreur99_check(const tgba* a,

src/tgbaalgos/gtec/status.cc

@@ -45,4 +45,10 @@ namespace spot
        << " strongly connected components in search stack"
        << std::endl;
   }
+
+  int
+  couvreur99_check_status::states() const
+  {
+    return h->size();
+  }
 }

src/tgbaalgos/gtec/status.hh

@@ -47,6 +47,9 @@ namespace spot
 
     /// Output statistics about this object.
     void print_stats(std::ostream& os) const;
+
+    /// Return the number of states visited by the search
+    int states() const;
   };
 
 }