On Nov 18, 2015, at 10:57 , Jens Alfke <j...@mooseyard.com> wrote:
> 
> Doesn’t the pointer become invalid as soon as myElement goes out of scope? 
> (There’s a reason that type is called *Unsafe*Pointer…)

Yes, but so does &myArray[0] in the original code. According to your 
hypothesis, it’s copied into a temporary, which also becomes invalid as soon as 
the current scope ends.

(I didn’t check the docs to see if the void* parameter to addToolTipRect needs 
a longer lifetime. If it does, then there’s manual memory management to do, 
regardless of what approach is taken. That’s why there ought to be a better 
API.)

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