food for thought - swift 5 released - bottom types, string interpolation, and stuff.

[Walter Bright]

On 4/13/2019 5:27 PM, Timon Gehr wrote:
> My point exactly. x & 1 is not the best implementation of isOdd for all 
> integer-representing types of x,

It is for all the basic integral types in D, and I would expect anyone 
implementing their own integral type to make x&1 work.

I.e. when you make your own integral type, the onus is on you to make the 
integer operators do the expected thing with it. D's template constraints should 
be good enough to recognize x&1 and make it efficient for the user defined type 
implementation.

isOdd() would be problematic for floating point types, which is a reason to 
avoid doing it for them, so people don't get surprised. (What is isOdd(infinity) 
supposed to do? true? false? throw exception? abort? launch nuclear missiles?)