1 files changed, 24 insertions, 0 deletions
diff --git a/odb/semantics/namespace.hxx b/odb/semantics/namespace.hxx
index a4ead38..df48e437 100644
--- a/odb/semantics/namespace.hxx
+++ b/odb/semantics/namespace.hxx
@@ -5,12 +5,16 @@
 #ifndef ODB_SEMANTICS_NAMESPACE_HXX
 #define ODB_SEMANTICS_NAMESPACE_HXX
 
+#include <vector>
+
 #include <odb/semantics/elements.hxx>
 
 namespace semantics
 {
   class namespace_: public scope
   {
+    typedef std::vector<namespace_*> extensions_type;
+
   public:
     bool
     extension () const
@@ -28,9 +32,28 @@ namespace semantics
     original (namespace_& ns)
     {
       original_ = &ns;
+      ns.extensions_.push_back (this);
     }
 
   public:
+    typedef extensions_type::const_iterator extensions_iterator;
+
+    extensions_iterator
+    extensions_begin () const {return extensions_.begin ();}
+
+    extensions_iterator
+    extensions_end () const {return extensions_.end ();}
+
+  public:
+    virtual names*
+    lookup (string const& name,
+            type_id const&,
+            unsigned int flags = 0,
+            bool* hidden = 0) const;
+
+    using scope::lookup;
+
+  public:
     namespace_ (path const&, size_t line, size_t column, tree);
 
     // Resolve conflict between scope::scope and nameable::scope.
@@ -42,6 +65,7 @@ namespace semantics
 
   private:
     namespace_* original_;
+    extensions_type extensions_;
   };
 }