PLCC-287 impl Neg for Measurement

crates/api/src/measurement/ops.rs

@@ -4,6 +4,31 @@
 use crate::{convertible::Convertible, error::Error, measurement::Measurement};
 use std::ops::{Add, Div, Mul, Sub};
 
+// ╭──────────╮
+// │ impl Neg │
+// ╰──────────╯
+impl std::ops::Neg for Measurement {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        Self {
+            value: self.value.neg(),
+            unit: self.unit,
+        }
+    }
+}
+
+impl<'a> std::ops::Neg for &'a Measurement {
+    type Output = Measurement;
+
+    fn neg(self) -> Self::Output {
+        Measurement {
+            value: self.value.neg(),
+            unit: self.unit.clone(),
+        }
+    }
+}
+
 //-----------------------------------------------------------------------------
 // impl Add
 //-----------------------------------------------------------------------------