std.algorithm.cmp doesn't seem to support numeric types?

[Paul Backus]

On Wednesday, 16 October 2019 at 19:25:18 UTC, DNoob wrote:
> I'm just learning D, so it's very possible that I'm missing a 
> more appropriate function that exists elsewhere, but basically 
> I found today that while I could easily write a cmp function 
> that worked for everything, the one in std.algorithm doesn't 
> seem to:

std.algorithm.cmp compares two ranges, not two values. From the 
documentation:

> Performs a lexicographical comparison on two input ranges. 
> Iterating r1 and
> r2 in lockstep, cmp compares each element e1 of r1 with the 
> corresponding
> element e2 in r2. If one of the ranges has been finished, cmp 
> returns a
> negative value if r1 has fewer elements than r2, a positive 
> value if r1 has
> more elements than r2, and 0 if the ranges have the same number 
> of elements.

Source: 
https://dlang.org/phobos/std_algorithm_comparison.html#.cmp