add GapBuffer::Iterator::operator*()

src/core/GapBuffer.h

@@ -28,6 +28,17 @@ public:
         {
             return m_gap_buffer->address(m_offset);
         }
+        uint32_t operator*() const
+        {
+            if (valid())
+            {
+                return Encoding::decode(m_gap_buffer->m_encoding, address());
+            }
+            else
+            {
+                return 0xFFFFFFFFu;
+            }
+        }
 
     protected:
         GapBuffer * m_gap_buffer;