so how you call bar and get default values for a, b, c? why lost default value for that function? it is wired. > >> 在 2016年7月7日，11:29，Douglas Gregor <[email protected]> 写道： >> >> >>> On Jul 6, 2016, at 8:25 PM, Cao, Jiannan via swift-evolution >>> <[email protected]> wrote: >>> >>> Don't agree with this one. >>> >>> func foo(a: Int = 0, b: Int = 1, c: Int = 2) { >>> print(a, b, c) >>> } >>> >>> foo(a: 1, c: 3) >>> >>> let bar = foo >>> >>> bar(1, 3) will different than foo(a: 1, c: 3) >> >> bar(1, 3) will result in an error, because “bar” is of type >> >> (Int, Int, Int) -> Void >> >> Default arguments are associated with function declarations, not function >> types. >> >> - Doug >> >> >>> >>>> 在 2016年7月7日，11:06，Chris Lattner <[email protected]> 写道： >>>> >>>> Proposal Link: >>>> https://github.com/apple/swift-evolution/blob/master/proposals/0111-remove-arg-label-type-significance.md >>>> >>>> The review of "SE-0111: Remove type system significance of function >>>> argument labels " ran from June 30 ... July 4, 2016. The proposal has been >>>> *accepted*: >>>> >>>> The community and core team agree that this proposal will lead to a >>>> simplification and clarification of the type system, as well as a more >>>> clear user model for parameter labels. In response to community feedback, >>>> the core team is accepting the proposal with a revision to allow “purely >>>> cosmetic” parameter labels in closure types for documentation (as outlined >>>> in the alternatives section). The core team also wants to clarify that a >>>> call to a value of closure type would not allow use of any parameter >>>> labels, some interpretations thought that “arbitrary” parameter labels >>>> could be used. >>>> >>>> Thank you to Austin Zheng for driving this discussion forward! I filed >>>> SR-2009 to track implementation work on this. >>>> >>>> -Chris Lattner >>>> Review Manager >>>> >>>> _______________________________________________ >>>> swift-evolution-announce mailing list >>>> [email protected] >>>> https://lists.swift.org/mailman/listinfo/swift-evolution-announce >>> >>> >>> _______________________________________________ >>> swift-evolution mailing list >>> [email protected] >>> https://lists.swift.org/mailman/listinfo/swift-evolution >> >
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