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From<(T,T)> implementation

This commit is contained in:
dnsl48 2016-12-10 09:19:02 +13:00
parent 70da35dff5
commit 9d7ab663b1
1 changed files with 16 additions and 0 deletions
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16
rational/src/lib.rs
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@ -268,6 +268,14 @@ impl<T> From<T> for Ratio<T> where T: Clone + Integer {
} }
} }
// From pair (through the `new` constructor)
impl<T> From<(T, T)> for Ratio<T> where T: Clone + Integer {
fn from(pair: (T, T)) -> Ratio<T> {
Ratio::new(pair.0, pair.1)
}
}
// Comparisons // Comparisons
// Mathematically, comparing a/b and c/d is the same as comparing a*d and b*c, but it's very easy // Mathematically, comparing a/b and c/d is the same as comparing a*d and b*c, but it's very easy
@ -1157,4 +1165,12 @@ mod test {
assert_eq! ((-2, 1), _NEG2.into()); assert_eq! ((-2, 1), _NEG2.into());
assert_eq! ((1, -2), _1_NEG2.into()); assert_eq! ((1, -2), _1_NEG2.into());
} }
#[test]
fn test_from_pair() {
assert_eq! (_0, Ratio::from ((0, 1)));
assert_eq! (_1, Ratio::from ((1, 1)));
assert_eq! (_NEG2, Ratio::from ((-2, 1)));
assert_eq! (_1_NEG2, Ratio::from ((1, -2)));
}
} }