Greg Parker 318f6c1ac5 [runtime] Add swift_unownedIsEqual and swift_unknownUnownedIsEqual. ...

It is safe to test pointer equality of an unowned variable, even if
the unowned variable refers to a dead object. Allowing this operation
without an unnecessary unowned abort enables some kinds of caching
schemes more cheaply than can be done with weak variables.

rdar://32142240

2017-06-01 13:53:19 -07:00

46 KiB

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