Re: When can String.enumerateSubstringsInRange ever pass in NIL?
Re: When can String.enumerateSubstringsInRange ever pass in NIL?
- Subject: Re: When can String.enumerateSubstringsInRange ever pass in NIL?
- From: Quincey Morris <email@hidden>
- Date: Mon, 30 May 2016 02:42:01 -0700
- Feedback-id: 167118m:167118agrif8a:167118shxMuJh5vW:SMTPCORP
On May 29, 2016, at 22:31 , Ken Thomases <email@hidden> wrote:
>
> I think the documentation for SubstringNotRequired is sufficient design contract:
>
> "NSStringEnumerationSubstringNotRequired
> "A way to indicate that the block does not need substring, in which case nil will be passed. This is simply a performance shortcut."
This contract is of the form “if A then B”, from which it is NOT generally valid to conclude “if not-A then not-B”. Plausibly, you can read a hidden “only” into the documentation, but I’d still suggest not relying on it, since it seems unnecessary.
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