The review of SE-0058 "Allow Swift types to provide custom Objective-C
representations" ran from April 4...11, 2016. The proposal has been deferred
from Swift 3. We agree that it would be valuable to give library authors the
ability to bridge their own types from Objective-C into Swift using the same
mechanisms as Foundation. However, we lack the confidence and implementation
experience to commit to `_ObjectiveCBridgeable` in its current form as public
API. In its current form, as its name suggests, the protocol was designed to
accommodate the specific needs of bridging Objective-C object types to Swift
value types. In the future, we may want to bridge with other platforms,
including C++ value types or other object systems such as COM, GObject, JVM, or
CLR. It isn't clear at this point whether these would be served by a
generalization of the existing mechanism, or by bespoke bridging protocols
tailored to each case. This is a valuable area to explore, but we feel that it
is too early at this point to accept our current design as public API.
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