* src/ltlvisit/apcollect.cc, src/ltlvisit/apcollect.hh: New files,

based on code from <Denis.Poitrenaud@lip6.fr>.
* src/ltlvisit/Makefile.am (libltlvisit_la_SOURCES, ltlvisit_HEADERS):
Add them.

src/ltlvisit/apcollect.cc

@@ -0,0 +1,64 @@
+// Copyright (C) 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
+// département Systèmes Répartis Coopératifs (SRC), Université Pierre
+// et Marie Curie.
+//
+// This file is part of Spot, a model checking library.
+//
+// Spot is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// Spot is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+// License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Spot; see the file COPYING.  If not, write to the Free
+// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+
+#include "apcollect.hh"
+
+namespace spot
+{
+  namespace ltl
+  {
+    namespace
+    {
+      class atomic_prop_collector : public spot::ltl::postfix_visitor
+      {
+      public:
+	atomic_prop_collector(atomic_prop_set* s)
+	  : postfix_visitor(), sap(s)
+	{
+	}
+
+	virtual ~atomic_prop_collector()
+	{
+	}
+
+	virtual void doit(spot::ltl::atomic_prop* ap)
+	{
+	  sap->insert(ap);
+	}
+
+      private:
+	atomic_prop_set* sap;
+      };
+    }
+
+    atomic_prop_set*
+    atomic_prop_collect(const formula* f, atomic_prop_set* s)
+    {
+      if (!s)
+	s = new atomic_prop_set;
+      atomic_prop_collector v(s);
+      const_cast<formula*>(f)->accept(v);
+      return s;
+    }
+
+  }
+
+}