From 780e6647b2eff29a34b5a95f9fa6594cb6cc77d8 Mon Sep 17 00:00:00 2001
From: King_DuckZ <king_duckz@gmx.com>
Date: Thu, 26 Jan 2017 17:26:26 +0000
Subject: [PATCH] Implement unary operator-

---
 include/vectorwrapper/vectorwrapper.hpp |  2 ++
 include/vectorwrapper/vectorwrapper.inl | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/vectorwrapper/vectorwrapper.hpp b/include/vectorwrapper/vectorwrapper.hpp
index 4a4fab6..9d32032 100644
--- a/include/vectorwrapper/vectorwrapper.hpp
+++ b/include/vectorwrapper/vectorwrapper.hpp
@@ -414,6 +414,8 @@ namespace vwr {
 	bool operator== ( const Vec<V>& parLeft, const typename VectorWrapperInfo<V>::scalar_type& parRight );
 	template <typename V>
 	bool operator< ( const Vec<V>& parLeft, const typename VectorWrapperInfo<V>::scalar_type& parRight );
+	template <typename V>
+	Vec<V> operator- ( const Vec<V>& parVec );
 
 	template <typename V1, typename T>
 	bool operator> ( const Vec<V1>& parLeft, const T& parRight );
diff --git a/include/vectorwrapper/vectorwrapper.inl b/include/vectorwrapper/vectorwrapper.inl
index 4f9da8c..85032aa 100644
--- a/include/vectorwrapper/vectorwrapper.inl
+++ b/include/vectorwrapper/vectorwrapper.inl
@@ -298,6 +298,12 @@ namespace vwr {
 			typedef Vec<typename std::common_type<V1, V2>::type> return_type;
 			return return_type(parOp(parLeft[I], parRight[I])...);
 		}
+
+		template <typename V, size_type... I>
+		inline
+		Vec<V> unary_operator_minus (const Vec<V>& parVec, bt::number_seq<size_type, I...>) {
+			return Vec<V>(-parVec[I]...);
+		}
 	} //namespace implem
 
 	template <typename V> const Vec<V, 1> Vec<V, 1>::unit_x(scalar_type(1));
@@ -401,6 +407,10 @@ namespace vwr {
 		}
 		return retval;
 	}
+	template <typename V>
+	inline Vec<V> operator- (const Vec<V>& parVec) {
+		return implem::unary_operator_minus(parVec, bt::number_range<size_type, 0, VectorWrapperInfo<V>::dimensions>());
+	}
 
 	template <typename V1, typename T>
 	inline bool operator> (const Vec<V1>& parLeft, const T& parRight) {