get rid of mirrorItemAt() which isn't used anywhere

Change-Id: Id6f2dbeed21cabc127d39538c0ff464077ada83f
diff --git a/include/utils/SortedVector.h b/include/utils/SortedVector.h
index fd1cb82..2d3e82a 100644
--- a/include/utils/SortedVector.h
+++ b/include/utils/SortedVector.h
@@ -98,8 +98,6 @@
     inline  const TYPE&     itemAt(size_t index) const;
     //! stack-usage of the vector. returns the top of the stack (last element)
             const TYPE&     top() const;
-    //! same as operator [], but allows to access the vector backward (from the end) with a negative index
-            const TYPE&     mirrorItemAt(ssize_t index) const;
 
     /*!
      * modifying the array
@@ -200,15 +198,6 @@
 }
 
 template<class TYPE> inline
-const TYPE& SortedVector<TYPE>::mirrorItemAt(ssize_t index) const {
-    const size_t i = index>0 ? index : -index;
-    LOG_FATAL_IF(index>=size(),
-            "%s: index=%u out of range (%u)", __PRETTY_FUNCTION__,
-            int(index), int(size()));
-    return *(array() + i);
-}
-
-template<class TYPE> inline
 const TYPE& SortedVector<TYPE>::top() const {
     return *(array() + size() - 1);
 }
diff --git a/include/utils/Vector.h b/include/utils/Vector.h
index 506acae..7927328 100644
--- a/include/utils/Vector.h
+++ b/include/utils/Vector.h
@@ -99,8 +99,6 @@
     inline  const TYPE&     itemAt(size_t index) const;
     //! stack-usage of the vector. returns the top of the stack (last element)
             const TYPE&     top() const;
-    //! same as operator [], but allows to access the vector backward (from the end) with a negative index
-            const TYPE&     mirrorItemAt(ssize_t index) const;
 
     /*!
      * modifying the array
@@ -284,15 +282,6 @@
 }
 
 template<class TYPE> inline
-const TYPE& Vector<TYPE>::mirrorItemAt(ssize_t index) const {
-    const size_t i = index>0 ? index : -index;
-    LOG_FATAL_IF(index>=size(),
-            "%s: index=%u out of range (%u)", __PRETTY_FUNCTION__,
-            int(index), int(size()));
-    return *(array() + i);
-}
-
-template<class TYPE> inline
 const TYPE& Vector<TYPE>::top() const {
     return *(array() + size() - 1);
 }