From 0a153e8e1243ed31203588c2f52669b9c77b1dd4 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Fri, 20 Feb 2015 16:06:46 +1100
Subject: [PATCH] region: add vector subtraction operator

---
 region.cpp | 9 +++++++++
 region.hpp | 1 +
 2 files changed, 10 insertions(+)

diff --git a/region.cpp b/region.cpp
index 5767270d..edba9e54 100644
--- a/region.cpp
+++ b/region.cpp
@@ -307,6 +307,15 @@ util::region<T>::operator+ (vector<2,T> rhs) const
 }
 
 
+//-----------------------------------------------------------------------------
+template <typename T>
+util::region<T>
+util::region<T>::operator- (vector<2,T> rhs) const
+{
+    return { x - rhs.x, y - rhs.y, w, h };
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 template <typename T>
 bool
diff --git a/region.hpp b/region.hpp
index 3bf839f9..ffdbcfdf 100644
--- a/region.hpp
+++ b/region.hpp
@@ -83,6 +83,7 @@ namespace util {
 
         // arithmetic operators
         region operator+ (vector<2,T>) const;
+        region operator- (vector<2,T>) const;
 
         // Logical comparison operators
         bool operator ==(const region<T>& rhs) const;