From cfc955debe9e8b2ff41942923335cd7454b6554f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Mon, 6 Aug 2012 16:06:23 +0200
Subject: [PATCH] Added Vector::sum(), so product() has a friend.

---
 src/Math/Test/VectorTest.cpp |  5 +++++
 src/Math/Test/VectorTest.h   |  1 +
 src/Math/Vector.h            | 12 +++++++++++-
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/Math/Test/VectorTest.cpp b/src/Math/Test/VectorTest.cpp
index 965a4c871..2d409ceed 100644
--- a/src/Math/Test/VectorTest.cpp
+++ b/src/Math/Test/VectorTest.cpp
@@ -40,6 +40,7 @@ VectorTest::VectorTest() {
              &VectorTest::length,
              &VectorTest::lengthSquared,
              &VectorTest::normalized,
+             &VectorTest::sum,
              &VectorTest::product,
              &VectorTest::angle,
              &VectorTest::negative,
@@ -121,6 +122,10 @@ void VectorTest::normalized() {
     CORRADE_COMPARE(Vector4(1.0f, 1.0f, 1.0f, 1.0f).normalized(), Vector4(0.5f, 0.5f, 0.5f, 0.5f));
 }
 
+void VectorTest::sum() {
+    CORRADE_COMPARE(Vector3(1.0f, 2.0f, 4.0f).sum(), 7.0f);
+}
+
 void VectorTest::product() {
     CORRADE_COMPARE(Vector3(1.0f, 2.0f, 3.0f).product(), 6.0f);
 }
diff --git a/src/Math/Test/VectorTest.h b/src/Math/Test/VectorTest.h
index c9b475e1c..a3795d551 100644
--- a/src/Math/Test/VectorTest.h
+++ b/src/Math/Test/VectorTest.h
@@ -32,6 +32,7 @@ class VectorTest: public Corrade::TestSuite::Tester<VectorTest> {
         void length();
         void lengthSquared();
         void normalized();
+        void sum();
         void product();
         void angle();
         void negative();
diff --git a/src/Math/Vector.h b/src/Math/Vector.h
index 1d075e241..fb3232947 100644
--- a/src/Math/Vector.h
+++ b/src/Math/Vector.h
@@ -268,9 +268,19 @@ template<size_t size, class T> class Vector {
             return *this/length();
         }
 
+        /** @brief Sum of values in the vector */
+        T sum() const {
+            T out(0);
+
+            for(size_t i = 0; i != size; ++i)
+                out += (*this)[i];
+
+            return out;
+        }
+
         /** @brief Product of values in the vector */
         T product() const {
-            T out = 1;
+            T out(1);
 
             for(size_t i = 0; i != size; ++i)
                 out *= (*this)[i];