Implement P3503R3 Make Type-Erased Allocator Use In promise
And packaged_task
Consistent
#5630
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... as a Defect Report against old modes (ideally since C++11). Fixes #5615.
This paper reverts LWG-2921 and supersedes LWG-2976, so I'm removing the corresponding comments from
<yvals_core.h>
.The new behavior depends on
dynamic_cast
due to ABI compatibility. Old behavior is kept when dynamic RTTI is off.