Start the ELTL translation (LACIM).

Merge all eltlast/ files into formula.hh (except automatop.hh).

src/ltlvisit/destroy.cc

@@ -25,17 +25,10 @@ namespace spot
 {
   namespace ltl
   {
-    namespace
+    void
+    destroy_visitor::doit_default(formula* c)
     {
-      class destroy_visitor: public postfix_visitor
-      {
-      public:
-	virtual void
-	doit_default(formula* c)
-	{
-	  formula::unref(c);
-	}
-      };
+      formula::unref(c);
     }
 
     void

src/ltlvisit/destroy.hh

@@ -28,6 +28,19 @@ namespace spot
 {
   namespace ltl
   {
+    /// \ingroup ltl_visitor
+    ///
+    /// This visitor is public, because it's convenient to write the
+    /// destroy method of the base_formula class.  But if you just
+    /// want the functionality, consider using spot::ltl::destroy
+    /// instead.
+    class destroy_visitor: public postfix_visitor
+    {
+    public:
+      virtual void
+      doit_default(formula* c);
+    };
+
     /// \brief Destroys a formula
     /// \ingroup ltl_essential
     void destroy(const formula *f);