fix two-level namespace lookup problems detected by clang++

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2439 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/img/base/src/image_state/image_state_algorithm.hh

@@ -331,7 +331,7 @@ public:
 private:
   template <typename T, class D>
   void T_Visit_(ImageStateImpl<T,D>& isi) {
-    VisitState(isi);
+    this->VisitState(isi);
   }
 };
 
@@ -376,7 +376,7 @@ public:
 private:
   template <typename T, class D>
   void T_Visit_(ImageStateImpl<T,D>& isi) const {
-    VisitState(isi);
+    this->VisitState(isi);
   }
 };
 
@@ -402,7 +402,7 @@ public:
 private:
   template <typename T, class D>
   ImageStateBasePtr T_Visit_(const ImageStateImpl<T,D>& isi) {
-    return VisitState(isi);
+    return this->VisitState(isi);
   }
 };
 
@@ -430,7 +430,7 @@ public:
 private:
   template <typename T, class D>
   ImageStateBasePtr T_Visit_(const ImageStateImpl<T,D>& isi) const {
-    return VisitState(isi);
+    return this->VisitState(isi);
   }
 };
 
@@ -457,7 +457,7 @@ public:
 private:
   template <typename T, class D>
   ImageStateBasePtr T_Visit_(ImageStateImpl<T,D>& isi) {
-    return VisitState(isi);
+    return this->VisitState(isi);
   }
 };