[swift-evolution] Proposal: Auto-convert for numbers when safe
jhull at gbis.com
Sat Dec 5 06:27:50 CST 2015
I understand why you can’t auto-convert from a Double to a Float or Int32 to Int8. It is good that we have to add the cast explicitly and think though the implications.
…but I don’t think through the implications because we currently have a boy who cried wolf situation where we have to explicitly cast everything (even the safe stuff).
I think all of the numeric types should be able to auto-convert if the conversion is safe (without loss of precision or overflow).
• If an Int is casting to a larger size (Int16 -> Int32)
• Float -> Double
• Float -> CGFloat
• Int -> Float, Double, or CGFloat (but not the other way)
I don’t see why these aren’t allowed. The forced casts make my code much less readable. Are the casts above dangerous in a way I am not aware of?
On a side note, can we get a version of floor() which returns an Int (or have I missed that somewhere)?
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