Fix some struct/class missmatches reported by clang.

* src/ltlast/predecl.hh: Predeclare the LTL AST nodes as class,
not struct.
* src/ltlast/nfa.hh (formula_tree::node): Predeclare as struct,
not class.

ChangeLog

+2010-11-20  Alexandre Duret-Lutz  <adl@lrde.epita.fr>
+
+	Fix some struct/class missmatches reported by clang.
+
+	* src/ltlast/predecl.hh: Predeclare the LTL AST nodes as class,
+	not struct.
+	* src/ltlast/nfa.hh (formula_tree::node): Predeclare as struct,
+	not class.
+
 2010-11-07  Alexandre Duret-Lutz  <adl@lrde.epita.fr>
 
 	Add interface for and test the bdd_setxor() function added to Buddy.

src/ltlast/nfa.hh

-// Copyright (C) 2008 Laboratoire de Recherche et Développement
+// Copyright (C) 2008, 2010 Laboratoire de Recherche et Développement
 // de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
@@ -39,7 +39,7 @@ namespace spot
     /// which are defined in formula_tree.hh, included in nfa.cc.
     namespace formula_tree
     {
-      class node;
+      struct node;
     }
 
     /// \brief Nondeterministic Finite Automata used by automata operators.

src/ltlast/predecl.hh

-// Copyright (C) 2003, 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
-// département Systèmes Répartis Coopératifs (SRC), Université Pierre
-// et Marie Curie.
+// Copyright (C) 2010  Laboratoire de Recherche et Developpement
+// de l'Epita.
+// Copyright (C) 2003, 2004  Laboratoire d'Informatique de Paris 6
+// (LIP6), dpartement Systmes Rpartis Coopratifs (SRC), Universit
+// Pierre et Marie Curie.
 //
 // This file is part of Spot, a model checking library.
 //
@@ -36,13 +38,13 @@ namespace spot
     struct visitor;
     struct const_visitor;
 
-    struct atomic_prop;
-    struct unop;
-    struct constant;
-    struct binop;
-    struct formula;
-    struct multop;
-    struct automatop;
+    class atomic_prop;
+    class unop;
+    class constant;
+    class binop;
+    class formula;
+    class multop;
+    class automatop;
   }
 }