> On Feb 25, 2016, at 3:31 PM, Quincey Morris 
> <quinceymor...@rivergatesoftware.com> wrote:
> 
> It’s another example of the “any cast is a bug waiting to happen” problem 
> that’s inherent in C-like languages.

To be fair, C++ does have const_cast, which only casts away ‘const’.

> For this situation it would be nice if there was a cast like this:
>       [hostArray addObject: (_Nonnull) url.host];

That’s exactly what the NOTNULL macro in my first message does. Its value has 
the same type as its argument, just with _Nonnull:
        #define NOTNULL(X) ((__typeof(X) _Nonnull)(X))

—Jens
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