Casting int[] to ubyte[]: element wise cast or slice cast

Dennis dkorpel at
Fri Feb 15 18:11:11 UTC 2019

On Friday, 15 February 2019 at 17:18:28 UTC, H. S. Teoh wrote:
> Why? because that's the only case where you can reinterpret the 
> .sizeof*.length bytes as an array of a different type.  There 
> is no conversion, the cast works as a reinterpretation.  It's 
> by design.

But my problem is that it *isn't* reinterpreted in the case of an 
enum / array literal, the cast actually transcribes similar to 
your .map example. Look carefully at the difference of case A and 
B in my example code: the only difference is whether the int 
array uses auto or enum.

I'm not going from ubyte to int, I'm going from int to ubyte 
which should always be possible by multiplying the length by 4, 
in my case:

int.sizeof * 2 == ubyte.sizeof * 8 == 8

This happens in case B of my example code, but not in case A. 
There the cast goes from 4*2 bytes to 1*2 instead of 1*8 and I 
don't get a runtime error.

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