Michael Gottesman 2a1d9199a3 [sema] Ban user created read/set accessor that produce noncopyable types. ...

The reason why we are doing this is that this combination of read/set forces the
compiler to emit a copy if we want to emit a modify operation.

The reason why we are forced to emit such a copy is that:

1. _read provides a guaranteed value in memory
2. performing a modify requires an owned value in memory.

This together implies that the only way we can do this is to copy from the _read
into temporary memory. But we have a noncopyable type so we can't do this.

rdar://112915525

2023-07-26 12:53:43 -07:00

2.5 KiB

Raw Blame History

View Raw