isIntegralBijectableType

import std.random : Random, uniform;
auto gen = Random();

enum maxCount = 1e4;
import std.algorithm : min;

static int cmp(T)(T x, T y) { return x < y ? -1 : x > y ? 1 : 0; }

foreach (T; AliasSeq!(ubyte, ushort, uint, ulong,
                      byte, short, int, long))
{
    foreach (i; 0 .. min(maxCount, T.max - T.min))
    {
        const x = uniform(T.min, T.max, gen);
        const y = uniform(T.min, T.max, gen);

        const expected = cmp(x,
                             y);
        const result = cmp(x.bijectToUnsigned,
                           y.bijectToUnsigned);

        assert(result == expected);
    }
}

foreach (T; AliasSeq!(float, double))
{
    foreach (i; 0 .. maxCount)
    {
        const T x = uniform(-1e20, +1e20, gen);
        const T y = uniform(-1e20, +1e20, gen);

        // import nxt.dbgio;
        // dbg(x, ",", y);

        const expected = cmp(x,
                             y);
        const result = cmp(x.bijectToUnsigned,
                           y.bijectToUnsigned);

        assert(result == expected);
    }
}