Add a missing conversion routine for object ids.

	* mln/convert/from_to.hxx,
	* mln/util/object_id.hh: Here.

milena/ChangeLog

+2011-06-07  Guillaume Lazzara  <z@lrde.epita.fr>
+
+	Add a missing conversion routine for object ids.
+
+	* mln/convert/from_to.hxx,
+	* mln/util/object_id.hh: Here.
+
 2011-05-26  Guillaume Lazzara  <z@lrde.epita.fr>
 	* mln/draw/site_set.hh: new.

milena/mln/convert/from_to.hxx

-// Copyright (C) 2008, 2009, 2010 EPITA Research and Development
+// Copyright (C) 2008, 2009, 2010, 2011 EPITA Research and Development
 // Laboratory (LRDE)
 //
 // This file is part of Olena.
@@ -84,6 +84,7 @@ namespace mln
 
   namespace util {
     template <typename T> class array;
+    template <typename Tag, typename V> class object_id;
   }
 
   namespace value {
@@ -473,6 +474,10 @@ namespace mln
         from_to(from.second(), to.second());
       }
 
+      // util::object_id<Tag,V> -> V.
+      template <typename Tag, typename V>
+      void from_to_(const util::object_id<Tag,V>& from, V& to_);
+
     } // end of namespace mln::convert::over_load
 
   } // end of namespace mln::convert

milena/mln/util/object_id.hh

@@ -38,6 +38,24 @@
 namespace mln
 {
 
+    // Forward declaration
+  namespace util { template <typename Tag, typename V> class object_id; }
+
+  namespace convert
+  {
+
+    namespace over_load
+    {
+
+      // object_id<Tag,V> -> V.
+      template <typename Tag, typename V>
+      void from_to_(const util::object_id<Tag,V>& from, V& to_);
+
+    } // end of namespace mln::convert::over_load
+
+  } // end of namespace mln::convert
+
+
   namespace util
   {
 
@@ -90,9 +108,12 @@ namespace mln
     bool
     operator<(const object_id<Tag,V>& lhs, const object_id<Tag,V>& rhs);
 
+  } // end of namespace mln::util
 
 # ifndef MLN_INCLUDE_ONLY
 
+  namespace util
+  {
 
     template <typename Tag, typename V>
     inline
@@ -205,10 +226,26 @@ namespace mln
       return lhs.value() < rhs.value();
     }
 
+  } // end of namespace mln::util
 
-# endif // ! MLN_INCLUDE_ONLY
+  namespace convert
+  {
 
-  } // end of namespace mln::util
+    namespace over_load
+    {
+
+      // object_id<Tag,V> -> V.
+      template <typename Tag, typename V>
+      void from_to_(const util::object_id<Tag,V>& from, V& to_)
+      {
+	to_ = from.value();
+      }
+
+    } // end of namespace mln::convert::over_load
+
+  } // end of namespace mln::convert
+
+# endif // ! MLN_INCLUDE_ONLY
 
 } // end of namespace mln