--- a/src/array_t.cpp	2017-09-17 00:51:49.983706157 -0400

+++ b/src/array_t.cpp	2017-09-17 00:51:57.155899534 -0400

@@ -185,7 +185,7 @@

     : actual(rhs), m_begin((T*)(rhs->begin())), m_end((T*)(rhs->end())) {

     if (actual != 0)

         actual->beginUse();

-    difference_type diff = m_end - m_begin;

+    //difference_type diff = m_end - m_begin;

     LOGGER(ibis::gVerbose > 9)

         << "array_t<" << typeid(T).name() << "> constructed at "