[swift-evolution] [Proposal] Remove force unwrapping in function signature.

[Chris Lattner]

> On Jul 20, 2016, at 5:24 PM, Saagar Jha <saagarjha28 at gmail.com> wrote:
> 
> Sorry for the last email…I didn’t see your response.
> 
> I realize that disallowing IUOs in parameters (but not as properties) is inconsistent, but IUOs for properties make sense: they must be set during initialization, but sometimes this isn’t possible. IUOs make it possible to use the property just as any other non-Optional one, provided the property is set before it is used (see the proposal). This kind of guarantee doesn’t work for function parameters and return values. 
> 
> As for IUOs for non-audited methods; why can’t they just all use Optional parameters? It should have the same behavior as before, since you can pass in both an Optional as well as a non-Optional even today.

Because an override of an unaudited method has to *use* the parameters.

-Chris
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20160720/ec34cc6c/attachment.html>