small API change: Measurement no longer takes a unit in new

Cargo.toml

@@ -1,4 +1,4 @@
 [package]
 name = "unidades"
-version = "1.1.2"
+version = "1.2.0"
 edition = "2021"

src/lib.rs

@@ -4,6 +4,8 @@ pub mod dimensions;
 pub mod units;
 pub mod prefixes;
 pub mod measurement;
+pub use units::unit;
+pub use prefixes::prefix_group;
 
 pub trait Unit<D> {
     fn new(v: f64) -> D;

src/measurement.rs

@@ -28,10 +28,8 @@ impl<
     const AMOUNT: i8,
     const INTENSITY: i8,
 > Measurement<TIME, LENGTH, MASS, CURRENT, TEMPERATURE, AMOUNT, INTENSITY> {
-    pub fn new<U>(v: f64) -> Self
-    where
-        U: Unit<Self> {
-        Self(v.mul(U::scale()).add(U::offset()))
+    pub fn new(v: f64) -> Self {
+        Self(v)
     }
 
     pub fn to_units<U>(self) -> f64

src/prefixes.rs

@@ -4,7 +4,8 @@ use crate::{
 };
 use core::marker::PhantomData;
 
-macro_rules! prefixes{
+#[macro_export]
+macro_rules! prefix_group{
     ($(($nym: ident, $scale: expr)), *) => {
         $(
             pub struct $nym < T >(PhantomData < T >);
@@ -48,7 +49,7 @@ macro_rules! prefixes{
     };
 }
 
-prefixes!{
+prefix_group!{
     (Quetta, 1e30),
     (Ronna, 1e27),
     (Yotta, 1e24),

src/units.rs

@@ -2,15 +2,17 @@ use crate::{
     Unit,
     dimensions::*,
 };
+use core::ops::{Mul, Add};
 
 const YEAR: f64 = 31_557_600.0;
 const DAY: f64 = 60.0 * 60.0 * 24.0;
 
+#[macro_export]
 macro_rules! unit{
     ($dimension: ident => $(($nym: ident, ($scale: expr, $offset: expr))), *) => {
         $(pub struct $nym; impl Unit < $dimension > for $nym {
             fn new(v: f64) -> $dimension {
-                $dimension:: new::< Self >(v)
+                $dimension:: new(v.mul(Self::scale()).add(Self::offset()))
             }
             fn scale() -> f64 {
                 $scale
@@ -22,20 +24,6 @@ macro_rules! unit{
     };
 }
 
-impl Unit<Scalar> for () {
-    fn new(v: f64) -> Scalar {
-        Scalar::new::<()>(v)
-    }
-
-    fn scale() -> f64 {
-        1.0
-    }
-
-    fn offset() -> f64 {
-        0.0
-    }
-}
-
 unit!{
     Time =>(Second, (1.0, 0.0)),
     (Kalpa, (YEAR * 1e9 * 4.32, 0.0)),