Imports name this capability’s declared dependencies, which fune builds next to it in your project; each one links to its page.
use super::funejson::Value; ← the fune runtime: the JSON value the test vectors use; fune build keeps it only where a signature takes one
use super::math_rational_rational::{rational_from_value, rational_parts}; ← rational, another function of this group · built into the same file, even by a slim install
/// -1, 0 or 1. Exact: cross-multiplied in i128, never through a float.
///
/// # Panics
/// Panics on a zero denominator or a part outside ±(2^53 - 1).
pub fn compare_rational(a: &Rational, b: &Rational) -> i64 {
let (an, ad) = rational_parts(a);
let (bn, bd) = rational_parts(b);
match (an * bd).cmp(&(bn * ad)) {
std::cmp::Ordering::Less => -1,
std::cmp::Ordering::Equal => 0,
std::cmp::Ordering::Greater => 1,
}
}
pub fn fune_vector(args: &[Value]) -> Value {
Value::Int(compare_rational(&rational_from_value(&args[0]), &rational_from_value(&args[1])))
}