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use {Integer, Rational};
use gmp_mpfr_sys::gmp;
use inner::Inner;
use rational::SmallRational;
use std::cmp::Ordering;
use std::i32;
impl Eq for Rational {}
impl Ord for Rational {
#[inline]
fn cmp(&self, other: &Rational) -> Ordering {
let ord = unsafe { gmp::mpq_cmp(self.inner(), other.inner()) };
ord.cmp(&0)
}
}
impl PartialEq for Rational {
#[inline]
fn eq(&self, other: &Rational) -> bool {
unsafe { gmp::mpq_equal(self.inner(), other.inner()) != 0 }
}
}
impl PartialOrd for Rational {
#[inline]
fn partial_cmp(&self, other: &Rational) -> Option<Ordering> {
Some(self.cmp(other))
}
}
macro_rules! cmp {
{ $T:ty, $eq:expr, $cmp:expr } => {
impl PartialEq<$T> for Rational {
#[inline]
fn eq(&self, other: &$T) -> bool {
$eq(self.inner(), other)
}
}
impl PartialEq<Rational> for $T {
#[inline]
fn eq(&self, other: &Rational) -> bool {
other.eq(self)
}
}
impl PartialOrd<$T> for Rational {
#[inline]
fn partial_cmp(&self, other: &$T) -> Option<Ordering> {
Some($cmp(self.inner(), other))
}
}
impl PartialOrd<Rational> for $T {
#[inline]
fn partial_cmp(&self, other: &Rational) -> Option<Ordering> {
other.partial_cmp(self).map(Ordering::reverse)
}
}
}
}
cmp! {
Integer,
|r, t: &Integer| unsafe { gmp::mpq_cmp_z(r, t.inner()) } == 0,
|r, t: &Integer| unsafe { gmp::mpq_cmp_z(r, t.inner()) }.cmp(&0)
}
cmp! {
i32,
|r, t: &i32| unsafe { gmp::mpq_cmp_si(r, (*t).into(), 1) } == 0,
|r, t: &i32| unsafe { gmp::mpq_cmp_si(r, (*t).into(), 1) }.cmp(&0)
}
cmp! {
u32,
|r, t: &u32| unsafe { gmp::mpq_cmp_ui(r, (*t).into(), 1) } == 0,
|r, t: &u32| unsafe { gmp::mpq_cmp_ui(r, (*t).into(), 1) }.cmp(&0)
}
macro_rules! cmp_small_rat {
{ $T:ty } => {
cmp! {
$T,
|r, t: &$T| unsafe {
gmp::mpq_equal(r, SmallRational::from(*t).inner())
} != 0,
|r, t: &$T| unsafe {
gmp::mpq_cmp(r, SmallRational::from(*t).inner())
}.cmp(&0)
}
};
}
cmp_small_rat! { i64 }
cmp_small_rat! { u64 }
cmp_small_rat! { (i32, i32) }
cmp_small_rat! { (i64, i64) }
cmp_small_rat! { (i32, u32) }
cmp_small_rat! { (i64, u64) }
cmp_small_rat! { (u32, i32) }
cmp_small_rat! { (u64, i64) }
cmp_small_rat! { (u32, u32) }
cmp_small_rat! { (u64, u64) }
#[cfg(test)]
mod tests {
use Rational;
use std::{i32, u32};
use std::cmp::Ordering;
#[test]
fn check_cmp_frac() {
let zero = Rational::new();
let u = [0, 1, 100, u32::MAX];
let s = [i32::MIN, -100, -1, 0, 1, 100, i32::MAX];
for &n in &u {
for &d in &u {
if d != 0 {
let ans = 0.partial_cmp(&n);
assert_eq!(zero.partial_cmp(&(n, d)), ans);
assert_eq!(zero.partial_cmp(&Rational::from((n, d))), ans);
}
}
for &d in &s {
if d != 0 {
let mut ans = 0.partial_cmp(&n);
if d < 0 {
ans = ans.map(Ordering::reverse);
}
assert_eq!(zero.partial_cmp(&(n, d)), ans);
assert_eq!(zero.partial_cmp(&Rational::from((n, d))), ans);
}
}
}
for &n in &s {
for &d in &u {
if d != 0 {
let ans = 0.partial_cmp(&n);
assert_eq!(zero.partial_cmp(&(n, d)), ans);
assert_eq!(zero.partial_cmp(&Rational::from((n, d))), ans);
}
}
for &d in &s {
if d != 0 {
let mut ans = 0.partial_cmp(&n);
if d < 0 {
ans = ans.map(Ordering::reverse);
}
assert_eq!(zero.partial_cmp(&(n, d)), ans);
assert_eq!(zero.partial_cmp(&Rational::from((n, d))), ans);
}
}
}
}
}