From f87481c5e029f95315196ef725572a237efea8af Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Wed, 15 Apr 2015 13:51:52 +1000
Subject: [PATCH] vector: add constant unit vector

---
 vector.cpp | 5 +++++
 vector.hpp | 1 +
 2 files changed, 6 insertions(+)

diff --git a/vector.cpp b/vector.cpp
index 407a47f5..57a82877 100644
--- a/vector.cpp
+++ b/vector.cpp
@@ -181,6 +181,11 @@ util::vector<S,T>::is_zero (void) const
 
 
 //-----------------------------------------------------------------------------
+template <size_t S, typename T>
+const util::vector<S,T>
+util::vector<S,T>::UNIT (T{1});
+
+
 template <size_t S, typename T>
 const util::vector<S,T>
 util::vector<S,T>::ZERO (T{0});
diff --git a/vector.hpp b/vector.hpp
index d85e570e..20c405a3 100644
--- a/vector.hpp
+++ b/vector.hpp
@@ -43,6 +43,7 @@ namespace util {
         vector<S,T>  normalised [[gnu::warn_unused_result]] (void) const;
 
         // constants
+        static const vector<S,T> UNIT;
         static const vector<S,T> ZERO;
 
         void sanity (void) const;