diff --git a/examples/copy_example.cpp b/examples/copy_example.cpp
index 9c96930..66d6d3b 100644
--- a/examples/copy_example.cpp
+++ b/examples/copy_example.cpp
@@ -111,7 +111,7 @@ inline I2 copy_(const I1& first, const I1& last, const I2& out)
 }
 
 template<typename T>
-inline T* copy_(const T* first, const T* last, T* out)
+inline T* copy_(const T*& first, const T*& last, T*& out)
 {
    return detail::copier< 
       ::boost::has_trivial_assign<T>::value
@@ -239,3 +239,4 @@ int cpp_main(int argc, char* argv[])
 
 
 
+