define iteration on ScopePath as reverse iteration on the contained Scopes

src/lib/iter-adapter.hpp

@@ -309,8 +309,8 @@ namespace lib {
         { }
       
       RangeIter ()
-        : p_(0)
-        , e_(0)
+        : p_()
+        , e_()
         { }
       
       
@@ -358,7 +358,7 @@ namespace lib {
       bool
       isValid ()  const
         {
-          return (p_!= IT(0)) && (p_ != e_);
+          return (p_!= IT()) && (p_ != e_);
         }
       
       bool

src/proc/mobject/session/scope-path.hpp

@@ -27,6 +27,7 @@
 //#include "proc/mobject/mobject.hpp"
 //#include "proc/mobject/placement-ref.hpp"
 #include "proc/mobject/session/scope.hpp"
+#include "lib/iter-adapter.hpp"
 
 #include <vector>
 //#include <string>
@@ -46,9 +47,17 @@ namespace session {
     {
       vector<Scope> path_;
       
+      typedef vector<Scope>                  _VType;
+      typedef _VType::const_reverse_iterator _VIter;
+      typedef lib::RangeIter<_VIter>      _IterType;
+      
     public:
       ScopePath();
       
+      /// Iteration is always ascending from leaf to root
+      typedef _IterType iterator;
+      iterator begin()  const;
+      iterator end()    const;
       
       Scope getLeaf()  const;
       
@@ -58,5 +67,18 @@ namespace session {
 ///////////////////////////TODO currently just fleshing the API
   
   
+  inline ScopePath::iterator
+  ScopePath::begin()  const
+  {
+    return iterator (path_.rbegin(), path_.rend());
+  }
+  
+  inline ScopePath::iterator
+  ScopePath::end()    const
+  {
+    return iterator();
+  }
+  
+  
 }} // namespace mobject::session
 #endif

tests/components/proc/mobject/scope-path-test.cpp

@@ -95,6 +95,20 @@ namespace test    {
         }
       
       
+      void
+      checkIteration (ScopePath path, PMO& refPlacement)
+        {
+          Scope refScope(refPlacement);
+          ScopePath::iterator ii = path.begin();
+          ASSERT (ii);
+          while (++ii)
+            {
+              ASSERT (*ii == refScope.getParent());
+              refScope = *ii;
+            }
+        }
+      
+      
       void
       checkRelations (ScopePath path1, PMO& refPlacement)
         {