https://svn.boost.org/trac10/ticket/10834 <p> The copy constructor of ptr_array uses operator[] to access the elements of the ptr_array to copy.<br /> Problem one: It is not save to call ptr_array[i] if element i is null.<br /> Problem two: Operator[] returns a reference to remove_nullable&lt;T&gt;::type. The address of this object is then casted to const T*, which fails with compilation error C2664 if T=nullable&lt;X&gt;, because X* cannot be casted to nullable&lt;X&gt;*. </p> <p> Reproduction: compile attached test.cpp<br /> Possible fix: see attached patch<br /> <br /> Regards, Florian </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/10834 Trac 1.4.3 florian.schmid1978@… Tue, 02 Dec 2014 09:47:04 GMT https://svn.boost.org/trac10/ticket/10834 https://svn.boost.org/trac10/ticket/10834 <ul> <li><strong>attachment</strong> → <span class="trac-field-new">ptr_array.zip</span> </li> </ul> Ticket florian.schmid1978@… Tue, 02 Dec 2014 09:52:53 GMT https://svn.boost.org/trac10/ticket/10834 https://svn.boost.org/trac10/ticket/10834 <ul> <li><strong>attachment</strong> → <span class="trac-field-new">ptr_array2.zip</span> </li> </ul> Ticket florian.schmid1978@… Tue, 02 Dec 2014 09:54:07 GMT