> On Mar 26, 2016, at 2:00 PM, Brent Royal-Gordon via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> If that's all you want, maybe we can have an attribute which says "prefer
> this version over that one":
>
> @preferred(since: 3.0, over: socket(_: Int32, _: Int32, _: Int32) ->
> Int32)
> func socket(domain:SocketDomain, type:SocketType,
> protocol:SocketProtocol) -> socket_t? {
> …
> }
>
> This would effectively apply an `@available(deprecated: 3.0, renamed:
> socket(domain: SocketDomain, type: SocketType, protocol: SocketProtocol) ->
> socket_t?)` to the other API.
This capability sounds useful in other situations where some outside API is
undesirable in your code. For example in the Swift standard library itself we
have our own "halt with an error" functions such as fatalError(). We almost
always want to use those instead of something like abort() or exit(). It would
be useful to mark fatalError() as the preferred replacement for abort() and
exit(). Then the compiler would help enforce our policy.
(In C code we could enforce such non-usage with ugly things like `#define
abort() dont_call_abort()`. That ugly solution is not available in Swift.)
--
Greg Parker gpar...@apple.com Runtime Wrangler
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