From c037055c95e6e169a4cd6e8cad5b37643bfb046d Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Tue, 29 Sep 2015 17:31:20 +1000
Subject: [PATCH] range: add subtraction operator definition

---
 range.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/range.cpp b/range.cpp
index da564b1a..6f8e3220 100644
--- a/range.cpp
+++ b/range.cpp
@@ -114,6 +114,15 @@ util::range<T>::operator* (T val) const
 }
 
 
+//-----------------------------------------------------------------------------
+template <typename T>
+util::range<T>
+util::range<T>::operator- (T val) const
+{
+    return util::range<T> (min - val, max - val);
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 namespace util {
     template <>