neorados: assoc_delete() uses allocator_traits

the std::allocator<T> member functions destroy() and deallocate() were
deprecated in c++17 and removed in c++20. call the static functions on
std::allocator_traits<T> instead

resolves the c++20 compilation error with clang13:

In file included from ceph/src/test/cls_fifo/bench_cls_fifo.cc:38:
ceph/src/neorados/cls/fifo.h:684:7: error: no member named 'destroy' in 'std::allocator<neorados::cls::fifo::detail::JournalProcessor<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>>>'
    a.destroy(t);
    ~ ^
ceph/src/neorados/cls/fifo.h:1728:11: note: in instantiation of function template specialization 'neorados::cls::fifo::FIFO::assoc_delete<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>, neorados::cls::fifo::detail::JournalProcessor<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>>>' requested here
    FIFO::assoc_delete(h, this);
          ^
ceph/src/neorados/cls/fifo.h:1605:6: note: in instantiation of member function 'neorados::cls::fifo::detail::JournalProcessor<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>>::handle' requested here
            handle(errc::inconsistency);
            ^
ceph/src/neorados/cls/fifo.h:857:8: note: in instantiation of member function 'neorados::cls::fifo::detail::JournalProcessor<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>>::process' requested here
    p->process();
       ^
/usr/include/boost/asio/bind_executor.hpp:407:12: note: in instantiation of member function 'neorados::cls::fifo::FIFO::NewPartPreparer<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>>::operator()' requested here
    return this->target_(BOOST_ASIO_MOVE_CAST(Args)(args)...);
           ^
ceph/src/common/async/bind_allocator.h:179:12: note: in instantiation of function template specialization 'boost::asio::executor_binder<neorados::cls::fifo::FIFO::NewPartPreparer<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>>, boost::asio::executor>::operator()<boost::system::error_code &, bool>' requested here
    return this->target(std::forward<Args>(args)...);
           ^
ceph/src/neorados/cls/fifo.h:939:5: note: in instantiation of function template specialization 'neorados::cls::fifo::FIFO::_update_meta<ceph::async::allocator_binder<boost::asio::executor_binder<neorados::cls::fifo::FIFO::NewPartPreparer<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>>, boost::asio::executor>, std::allocator<void>>>' requested here
    _update_meta(fifo::update{}.journal_entries_add(jentries),
    ^
ceph/src/neorados/cls/fifo.h:1008:7: note: in instantiation of function template specialization 'neorados::cls::fifo::FIFO::_prepare_new_part<ceph::async::allocator_binder<boost::asio::executor_binder<(lambda at ceph/src/neorados/cls/fifo.h:1012:4), boost::asio::executor>, std::allocator<void>>>' requested here
      _prepare_new_part(
      ^
ceph/src/neorados/cls/fifo.h:524:7: note: in instantiation of function template specialization 'neorados::cls::fifo::FIFO::_prepare_new_head<ceph::async::allocator_binder<boost::asio::executor_binder<neorados::cls::fifo::FIFO::Pusher<spawn::detail::coro_handler<boost::asio::executor_binder<void (*)(), boost::asio::executor>, void>>, boost::asio::executor>, std::allocator<void>>>' requested here
      _prepare_new_head(std::move(p));
      ^

Signed-off-by: Casey Bodley <cbodley@redhat.com>

diff --git a/src/neorados/cls/fifo.h b/src/neorados/cls/fifo.h
index 4c7ba4779ecce0a87dd2a4086c55a9bdfa540d9a..b95f7f94ffec93ab151871cc9183c496552dc7cd 100644 (file)
--- a/src/neorados/cls/fifo.h
+++ b/src/neorados/cls/fifo.h
@@ -667,11 +667,13 @@ private:
 
   template<typename Handler, typename T>
   static void assoc_delete(const Handler& handler, T* t) {
-    typename std::allocator_traits<typename ba::associated_allocator<Handler>::type>
-      ::template rebind_alloc<T> a(
-       ba::get_associated_allocator(handler));
-    a.destroy(t);
-    a.deallocate(t, 1);
+    using Alloc = ba::associated_allocator_t<Handler>;
+    using Traits = typename std::allocator_traits<Alloc>;
+    using RebindAlloc = typename Traits::template rebind_alloc<T>;
+    using RebindTraits = typename std::allocator_traits<RebindAlloc>;
+    RebindAlloc a(get_associated_allocator(handler));
+    RebindTraits::destroy(a, t);
+    RebindTraits::deallocate(a, t, 1);
   }
 
   FIFO(RADOS& r,