C++23 deprecated std::aligned_storage: http://wg21.link/p1413. We make use of this in several places and these should be replaced with equivalent code that won’t trigger warnings once compilers implement p1413.
Deferred until we see warnings with stakeholder interest
Issue #606 was marked as a duplicate of this issue.
Extracted from issue 606, which I've closed as a dup of this one:
Testing of g++ 13.1.0 with -std=c++23 yields the following warnings (truncated for brevity) when compiling even a trivial application such as test/hello_upcxx.cpp:
include/upcxx/future/core.hpp:388:43: warning: 'template<long unsigned int _Len, long unsigned int _Align> struct std::aligned_storage' is deprecated [-Wdeprecated-declarations]
include/upcxx/serialization.hpp:1274:23: warning: 'template<long unsigned int _Len, long unsigned int _Align> struct std::aligned_storage' is deprecated [-Wdeprecated-declarations]
include/upcxx/serialization.hpp:1767:23: warning: 'template<long unsigned int _Len, long unsigned int _Align> struct std::aligned_storage' is deprecated [-Wdeprecated-declarations]
include/upcxx/utility.hpp:329:19: warning: 'template<long unsigned int _Len, long unsigned int _Align> struct std::aligned_storage' is deprecated [-Wdeprecated-declarations]
include/upcxx/utility.hpp:379:19: warning: 'template<long unsigned int _Len, long unsigned int _Align> struct std::aligned_storage' is deprecated [-Wdeprecated-declarations]
As of release 2022.9.0
std::aligned_storagehas been removed from our training materials, and in many use cases replaced withstd::optional.std::aligned_storageis still used in a few tests (for deprecated or undocumented serialization interfaces), and internally by a several library headers/modules (notably insidedetail::raw_storage). We should eventually remove the remaining references (at least in C++23 mode) to avoid warnings and comply with the capricious whims of the C++ committee.