Merge #28

28: Implement is_one for BigUint and BigInt. r=cuviper a=clarcharr

Won't work until a newer version of `num-traits` is pushed, but I figured I'd offer these now.

Author: bors[bot]

Cargo.toml

@@ -29,7 +29,7 @@ version = "0.1.36"
 default-features = false
 
 [dependencies.num-traits]
-version = "0.2.0"
+version = "0.2.1"
 default-features = false
 features = ["std"]
 

src/bigint.rs

@@ -274,6 +274,11 @@ impl One for BigInt {
     fn one() -> BigInt {
         BigInt::from_biguint(Plus, One::one())
     }
+
+    #[inline]
+    fn is_one(&self) -> bool {
+        self.sign == Plus && self.data.is_one()
+    }
 }
 
 impl Signed for BigInt {

src/biguint.rs

@@ -417,6 +417,11 @@ impl One for BigUint {
     fn one() -> BigUint {
         BigUint::new(vec![1])
     }
+
+    #[inline]
+    fn is_one(&self) -> bool {
+        self.data[..] == [1]
+    }
 }
 
 impl Unsigned for BigUint {}