- A parameter binding can be marked `ref` instead of `var` or the
default. It will bind to reference argument expressions in the caller
and produces a reference expression in the callee.
- Unlike pointers, a `ref` binding can't be rebound to a different
object.
- This replaces `addr`, and is not restricted to the `self` parameter.
- A `ref` binding, like a value binding, can't be used in fields of
classes or structs.
- When calling functions, arguments to non-`self` `ref` parameters are
also marked with `ref`.
- The return of a function can optionally be marked `ref`, `val`, or
`var`. These control the category of the call expression invoking the
function, and how the return expression is returned.
- These may be mixed for functions returning tuple or struct forms.
- The address of a `ref` binding is `nocapture` and `noalias`.
- We mark parameters of a function that may be referenced by the return
value with `bound`.
---------
Co-authored-by: Josh L <josh11b@users.noreply.github.com>
Co-authored-by: Geoff Romer <gromer@google.com>
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
This directory contains accepted proposals for the carbon-lang repository. For
information about declined/deferred proposals, please view the proposal's
original pull request.
For accepted proposals, where #### is the corresponding proposal's pull
request:
p####.md will contain the main proposal text.
p#### may be present as an optional subdirectory for related files (for
example, images).
ac98870e67