From ccbfa776c69adb02235eacf7d72d9a2adc596f49 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Thu, 7 Sep 2017 21:58:53 +0200
Subject: Impl AddAssign and SubAssign for TimeType

---
 src/timetype.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/timetype.rs b/src/timetype.rs
index a895ea1..5df7c23 100644
--- a/src/timetype.rs
+++ b/src/timetype.rs
@@ -4,7 +4,9 @@
 use chrono::NaiveDateTime;
 
 use std::ops::Add;
+use std::ops::AddAssign;
 use std::ops::Sub;
+use std::ops::SubAssign;
 
 use result::Result;
 use error::KairosErrorKind as KEK;
@@ -30,6 +32,12 @@ impl Add for TimeType {
     }
 }
 
+impl AddAssign for TimeType {
+    fn add_assign(&mut self, rhs: TimeType) {
+        *self = TimeType::Addition(Box::new(self.clone()), Box::new(rhs));
+    }
+}
+
 impl Sub for TimeType {
     type Output = TimeType;
 
@@ -38,6 +46,12 @@ impl Sub for TimeType {
     }
 }
 
+impl SubAssign for TimeType {
+    fn sub_assign(&mut self, rhs: TimeType) {
+        *self = TimeType::Subtraction(Box::new(self.clone()), Box::new(rhs));
+    }
+}
+
 /// The TimeType type
 ///
 /// # Warning
-- 
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