[llvm-bugs] [Bug 48439] New: Allocator propagation broken for std::string move assignment

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48439

            Bug ID: 48439
           Summary: Allocator propagation broken for std::string move
                    assignment
           Product: libc++
           Version: 10.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: oliver.rosten at googlemail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Consider the case where

propagate on container copy assignment = true
propagate on container move assignment = false

and focus on move assignment.

Suppose that the (stateful) instances of the allocators are not equal to one
another.

In this case, __move_assign delegates to assign. As far as I can tell, this
delegates to copy assignment. However, the latter considers propagation on
container copy and not container move.

This gives the wrong outcome in the case described.

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