Improved unit printing

src/quantity/scalar/f64base.rs

@@ -48,6 +48,7 @@ impl ScalarBase for F64Base {
 	foward!(fract);
 
 	fn is_zero(&self) -> bool {self.val == 0f64}
+	fn is_one(&self) -> bool {self.val == 1f64}
 	fn is_negative(&self) -> bool { self.val.is_sign_negative() }
 	fn is_positive(&self) -> bool { self.val.is_sign_positive() }
 

src/quantity/scalar/floatbase.rs

@@ -123,6 +123,7 @@ impl ScalarBase for FloatBase {
 	foward!(fract);
 
 	fn is_zero(&self) -> bool {self.val.is_zero()}
+	fn is_one(&self) -> bool {self.val == Float::with_val(FLOAT_PRECISION, 1)}
 	fn is_negative(&self) -> bool { self.val.is_sign_negative() }
 	fn is_positive(&self) -> bool { self.val.is_sign_positive() }
 

src/quantity/scalar/mod.rs

@@ -24,6 +24,7 @@ pub trait ScalarBase:
 	// Utility
 	fn fract(&self) -> Option<Self>;
 	fn is_zero(&self) -> bool;
+	fn is_one(&self) -> bool;
 	fn is_negative(&self) -> bool;
 	fn is_positive(&self) -> bool;
 
@@ -163,6 +164,13 @@ impl Scalar {
 		}
 	}
 
+	pub fn is_one(&self) -> bool {
+		match self {
+			Scalar::Rational{v} => v.is_one(),
+			Scalar::Float{v} => v.is_one(),
+		}
+	}
+
 	pub fn is_negative(&self) -> bool {
 		match self {
 			Scalar::Rational{v} => v.is_negative(),

src/quantity/scalar/rationalbase.rs

@@ -110,6 +110,7 @@ impl ScalarBase for RationalBase {
 	}
 
 	fn is_zero(&self) -> bool {self.val == Rational::from((0,1))}
+	fn is_one(&self) -> bool {self.val == Rational::from((1,1))}
 	fn is_negative(&self) -> bool { self.val.clone().signum() == -1 }
 	fn is_positive(&self) -> bool { self.val.clone().signum() == 1 }