https://svn.boost.org/trac10/ticket/11779 <p> Xcode Version 7.1 (7B91b) </p> <p> When using <code>boost::lockfree::queue</code> I get the following implicit conversion warnings: </p> <pre class="wiki">In file included from /foobar/source/foundation/concurrency/task_queue.cpp:11: In file included from /foobar/libraries/boost/install.osx/include/boost/lockfree/queue.hpp:21: In file included from /foobar/libraries/boost/install.osx/include/boost/lockfree/detail/freelist.hpp:23: In file included from /foobar/libraries/boost/install.osx/include/boost/lockfree/detail/tagged_ptr.hpp:18: /foobar/libraries/boost/install.osx/include/boost/lockfree/detail/tagged_ptr_ptrcompression.hpp:59:30: warning: implicit conversion loses integer precision: 'int' to 'tag_t' (aka 'unsigned short') [-Wconversion] ret.tag[tag_index] = tag; ~ ^~~ /foobar/libraries/boost/install.osx/include/boost/lockfree/detail/tagged_ptr_ptrcompression.hpp:78:13: note: in instantiation of member function 'boost::lockfree::detail::tagged_ptr&lt;boost::lockfree::queue&lt;std::__1::packaged_task&lt;void ()&gt; *, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_&gt;::node&gt;::pack_ptr' requested here ptr(pack_ptr(p, t)) ^ In file included from /foobar/source/foundation/concurrency/task_queue.cpp:11: /foobar/libraries/boost/install.osx/include/boost/lockfree/queue.hpp:202:15: note: in instantiation of member function 'boost::lockfree::detail::tagged_ptr&lt;boost::lockfree::queue&lt;std::__1::packaged_task&lt;void ()&gt; *, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_&gt;::node&gt;::tagged_ptr' requested here head_(tagged_node_handle(0, 0)), ^ /foobar/source/foundation/concurrency/task_queue.cpp:40:29: note: in instantiation of member function 'boost::lockfree::queue&lt;std::__1::packaged_task&lt;void ()&gt; *, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_&gt;::queue' requested here TaskQueueContext(void) : Queue(128) {} }}} ^ </pre> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/11779 Trac 1.4.3 Markus Tue, 11 Apr 2017 09:01:12 GMT