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extra: Add getter methods to extra::rational::Ratio #10050

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Oct 28, 2013
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66 changes: 66 additions & 0 deletions src/libextra/num/rational.rs
Original file line number Diff line number Diff line change
@@ -57,6 +57,30 @@ impl<T: Clone + Integer + Ord>
ret
}

/// Convert to an integer.
#[inline]
pub fn to_integer(&self) -> T {
self.trunc().numer
}

/// Gets an immutable reference to the numerator.
#[inline]
pub fn numer<'a>(&'a self) -> &'a T {
&self.numer
}

/// Gets an immutable reference to the denominator.
#[inline]
pub fn denom<'a>(&'a self) -> &'a T {
&self.denom
}

/// Return true if the rational number is an integer (denominator is 1).
#[inline]
pub fn is_integer(&self) -> bool {
self.denom == One::one()
}

/// Put self into lowest terms, with denom > 0.
fn reduce(&mut self) {
let g : T = self.numer.gcd(&self.denom);
@@ -362,6 +386,48 @@ mod test {
}


#[test]
fn test_to_integer() {
assert_eq!(_0.to_integer(), 0);
assert_eq!(_1.to_integer(), 1);
assert_eq!(_2.to_integer(), 2);
assert_eq!(_1_2.to_integer(), 0);
assert_eq!(_3_2.to_integer(), 1);
assert_eq!(_neg1_2.to_integer(), 0);
}


#[test]
fn test_numer() {
assert_eq!(_0.numer(), &0);
assert_eq!(_1.numer(), &1);
assert_eq!(_2.numer(), &2);
assert_eq!(_1_2.numer(), &1);
assert_eq!(_3_2.numer(), &3);
assert_eq!(_neg1_2.numer(), &(-1));
}
#[test]
fn test_denom() {
assert_eq!(_0.denom(), &1);
assert_eq!(_1.denom(), &1);
assert_eq!(_2.denom(), &1);
assert_eq!(_1_2.denom(), &2);
assert_eq!(_3_2.denom(), &2);
assert_eq!(_neg1_2.denom(), &2);
}


#[test]
fn test_is_integer() {
assert!(_0.is_integer());
assert!(_1.is_integer());
assert!(_2.is_integer());
assert!(!_1_2.is_integer());
assert!(!_3_2.is_integer());
assert!(!_neg1_2.is_integer());
}


mod arith {
use super::*;
use super::super::*;