From 1b78658906aacfa4a766b3d6b6fc32d7ecbdb57d Mon Sep 17 00:00:00 2001
From: Mattijah <Mattijah@users.noreply.github.com>
Date: Wed, 6 Sep 2017 14:15:43 +0100
Subject: [PATCH] Add an ability to copy the value from Observable without
 having to access it first

---
 Observable-Swift/Protocols.swift | 7 ++++++-
 README.md                        | 6 ++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Observable-Swift/Protocols.swift b/Observable-Swift/Protocols.swift
index 77264cf..0bd0b36 100644
--- a/Observable-Swift/Protocols.swift
+++ b/Observable-Swift/Protocols.swift
@@ -71,7 +71,7 @@ public protocol OwnableObservable: AnyObservable {
 
 }
 
-// observable <- value
+// (observable <- value) or (observable.value <- observable.value)
 infix operator <-
 
 // value = observable^
@@ -117,6 +117,11 @@ public func += <T> (event: EventReference<ValueChange<T>>, handler: @escaping (T
     return event.add({ handler($0.newValue) })
 }
 
+// for observable values on observable values
+public func <- <T : WritableObservable & UnownableObservable> (x: inout T, y: T) {
+    x.value = y.value
+}
+
 // for observable values on variables
 public func <- <T : WritableObservable & UnownableObservable> (x: inout T, y: T.ValueType) {
     x.value = y
diff --git a/README.md b/README.md
index 6d3ce11..3220bd1 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,12 @@ x.afterChange += { println("Changed x from \($0) to \($1)") }
 // change the value, prints "Changed x from 0 to 42"
 x <- 42
 // alternativelyL x ^= 42, without operators: x.value = 42
+
+
+var y = Observable(0)
+
+// Copy the value from one observable to another one, prints "Changed x from 42 to 0"
+x <- y
 ```
 
 You can, of course, have observable properties in a `class` or a `struct`: