* src/tgba/tgba.hh (tgba::~tgba): Make it public.

* src/tgba/tgbatba.cc, src/tgba/tgbatba.hh: New files.
* src/tgba/Makefile.am (tgba_HEADERS): Add tgbatba.hh.
(libtgba_la_SOURCES): Add tgbatba.cc.
* src/tgbatest/ltl2tgba.cc: Add option -D.

src/tgba/tgbatba.hh

@@ -0,0 +1,62 @@
+#ifndef SPOT_TGBA_TGBATBA_HH
+# define SPOT_TGBA_TGBATBA_HH
+
+#include "tgba.hh"
+#include "misc/bddlt.hh"
+
+namespace spot
+{
+
+  /// \brief Degeneralize a spot::tgba on the fly.
+  ///
+  /// This class acts as a proxy in front of a spot::tgba, that should
+  /// be degeneralized on the fly.
+  ///
+  /// This automaton is a spot::tgba, but it will always have exactly
+  /// one accepting condition.
+  ///
+  /// The degeneralization is done by synchronizing the input
+  /// automaton with a "counter" automaton such as the one shown in
+  /// "On-the-fly Verification of Linear Temporal Logic" (Jean-Michel
+  /// Couveur, FME99).
+  ///
+  /// If the input automaton uses N accepting conditions, the output
+  /// automaton can have at most max(N,1)+1 times more states and
+  /// transitions.
+  class tgba_tba_proxy : public tgba
+  {
+  public:
+    tgba_tba_proxy(const tgba* a);
+
+    virtual ~tgba_tba_proxy();
+
+    virtual state* get_init_state() const;
+
+    virtual tgba_succ_iterator*
+    succ_iter(const state* local_state,
+	      const state* global_state = 0,
+	      const tgba* global_automaton = 0) const;
+
+    virtual bdd_dict* get_dict() const;
+
+    virtual std::string format_state(const state* state) const;
+
+    virtual bdd all_accepting_conditions() const;
+    virtual bdd neg_accepting_conditions() const;
+
+  protected:
+    virtual bdd compute_support_conditions(const state* state) const;
+    virtual bdd compute_support_variables(const state* state) const;
+
+  private:
+    const tgba* a_;
+    typedef std::map<bdd, bdd, bdd_less_than> cycle_map;
+    cycle_map acc_cycle_;
+    bdd the_accepting_cond_;
+    // Disallow copy.
+    tgba_tba_proxy(const tgba_tba_proxy&);
+    tgba_tba_proxy& tgba_tba_proxy::operator=(const tgba_tba_proxy&);
+  };
+
+}
+#endif // SPOT_TGBA_TGBATBA_HH