On Saturday, August 27, 2016 at 3:38:11 AM UTC+8, xiio...@gmail.com wrote:
>
> As an aside - there is a complication to this if this (original post) were
> allowed/added to the language specification
>
>
> var (
> a float32 = 1.0
> aa []float32 = []float32{1.0, 2.0, 3.0}
> )
>
> b := float64(a) //is ok
> bb := ([]float64)(aa) //not ok
>
>
> If the second conversion bb was allowed it would require a lot of extra
> magic work underneath -as a new slice would have to be created, large
> enough to store float64s - not just a case of changing the slice header to
> point at a new type.
>
I don't think so. I think changing the slice header is enough. Doing more
is strange.
>
> So in reference to the original example - either extra code would have to
> be added to do this work, or these cases of type conversion would have to
> be dissallowed for slices.. Either way that's more compiler code, not less.
>
>
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