Nonescapable stdlib primitives #2657
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The proposed variant is much too limited, and it also introduces a new axis of unsafety that may better be expressed with dedicated API. We do not see any _immediate_ need for bit casting between escapable/nonescapable types, so it seems we can safely defer this work.
rjmccall
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… edits - Add generalizations for `==`/`!=` over existential metatypes - Update ObjectIdentifier.init to use the right definition now that it works - Take out the generalization of `Optional.unsafelyUnwrapped` due to issues with C++ interop. (I expect we’ll fix this in the next proposal in this series.) - Add explicit (illustrative) attributes to describe the lifetime semantics of generalized API. - General copy editing
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This document proposes to allow
OptionalandResultto hold instances of nonescapable types, and continues the work of adding support for noncopyable and nonescapable types throughout the Swift Standard Library.