Function cmp_float_nan

pub fn cmp_float_nan<F: Float>(a: F, b: F) -> Ordering

Compare 2 floats, NaN’s will always return Ordering::Equal.

assert_eq!(cmp_float_nan(0.0, 1.0), Ordering::Less);
assert_eq!(cmp_float_nan(1.0, 1.0), Ordering::Equal);
assert_eq!(cmp_float_nan(2.0, 1.0), Ordering::Greater);

assert_eq!(cmp_float_nan(1.0,           f32::INFINITY), Ordering::Less);
assert_eq!(cmp_float_nan(f32::INFINITY, f32::INFINITY), Ordering::Equal);
assert_eq!(cmp_float_nan(f32::INFINITY, 1.0),           Ordering::Greater);

assert_eq!(cmp_float_nan(f32::NEG_INFINITY, f32::INFINITY),     Ordering::Less);
assert_eq!(cmp_float_nan(f32::NEG_INFINITY, f32::NEG_INFINITY), Ordering::Equal);
assert_eq!(cmp_float_nan(f32::INFINITY,     f32::NEG_INFINITY), Ordering::Greater);

assert_eq!(cmp_float_nan(f32::NAN, -0.0),              Ordering::Equal);
assert_eq!(cmp_float_nan(f32::NAN, 0.0),               Ordering::Equal);
assert_eq!(cmp_float_nan(f32::NAN, f32::NAN),          Ordering::Equal);
assert_eq!(cmp_float_nan(f32::NAN, f32::INFINITY),     Ordering::Equal);
assert_eq!(cmp_float_nan(f32::NAN, f32::NEG_INFINITY), Ordering::Equal);