* src/tgba/statebdd.hh (state_bdd::as_bdd): Add non-const variant.

* src/tgba/tgbabddtranslateproxy.cc,
src/tgba/tgbabddtranslateproxy.hh: New files.
* src/tgba/Makefile.am (libtgba_la_SOURCES): Add them.

src/tgba/tgbabddprod.hh

@@ -0,0 +1,112 @@
+#ifndef SPOT_TGBA_TGBABDDPROD_HH
+# define SPOT_TGBA_TGBABDDPROD_HH
+
+#include "tgba.hh"
+#include "statebdd.hh"
+
+namespace spot
+{
+
+  /// \brief A state for spot::tgba_bdd_product.  
+  ///
+  /// This state is in fact a pair of state: the state from the left
+  /// automaton and that of the right.
+  class state_bdd_product : public state_bdd
+  {
+  public:
+    /// \brief Constructor
+    /// \param left The state from the left automaton.
+    /// \param right The state from the right automaton.
+    /// These state are acquired by spot::state_bdd_product, and will
+    /// be deleted on destruction.
+    state_bdd_product(state_bdd* left, state_bdd* right)
+      : state_bdd(left->as_bdd() & right->as_bdd()), 
+	left_(left), 
+	right_(right)
+    {
+    }
+    
+    virtual ~state_bdd_product();
+
+    state_bdd* 
+    left() const
+    {
+      return left_;
+    }
+
+    state_bdd* 
+    right() const
+    {
+      return right_;
+    }
+
+    virtual int compare(const state* other) const;
+
+  private:
+    state_bdd* left_;		///< State from the left automaton.
+    state_bdd* right_;		///< State from the right automaton.
+  };
+
+
+  /// \brief Iterate over the successors of a product computed on the fly.
+  class tgba_bdd_product_succ_iterator: public tgba_succ_iterator
+  {
+  public:
+    tgba_bdd_product_succ_iterator(tgba_succ_iterator* left, 
+				   tgba_succ_iterator* right);
+    
+    // iteration
+    void first();
+    void next();
+    bool done();
+
+    // inspection
+    state_bdd* current_state();
+    bdd current_condition();
+    bdd current_promise();
+
+  private:
+    //@{
+    /// Internal routines to advance to the next successor.
+    void step_();
+    void next_non_false_();
+    //@}
+
+  protected:
+    tgba_succ_iterator* left_;
+    tgba_succ_iterator* right_;
+    bdd current_cond_;
+  };
+  
+  /// \brief A lazy product.  (States are computed on the fly.)
+  class tgba_bdd_product : public tgba
+  {
+  public:
+    /// \brief Constructor.
+    /// \param left The left automata in the product.
+    /// \param right The right automata in the product.
+    /// Do not be fooled by these arguments: a product \emph is commutative.
+    tgba_bdd_product(const tgba& left, const tgba& right);
+    
+    virtual ~tgba_bdd_product();
+    
+    virtual state* get_init_state() const;
+
+    virtual tgba_bdd_product_succ_iterator* 
+    succ_iter(const state* state) const;
+
+    virtual const tgba_bdd_dict& get_dict() const;
+
+    virtual std::string format_state(const state* state) const;
+
+  private:
+    const tgba* left_;
+    bool left_should_be_freed_;
+    const tgba* right_;
+    bool right_should_be_freed_;
+    tgba_bdd_dict dict_;
+  };
+
+}
+
+#endif // SPOT_TGBA_TGBABDDPROD_HH