Math: function to compute product of all values in the vector.

Is this mathematic operation at all?

src/Math/Test/VectorTest.cpp

@@ -121,6 +121,12 @@ void VectorTest::normalized() {
     QVERIFY(Vector4(vec).normalized() == Vector4(normalized));
 }
 
+void VectorTest::product() {
+    float vec[] = { 1.0f, 2.0f, 3.0f };
+
+    QCOMPARE(Vector3(vec).product(), 6.0f);
+}
+
 void VectorTest::angle() {
     float a[] = { 2.0f, 3.0f, 4.0f };
     float b[] = { 1.0f, -2.0f, 3.0f };

src/Math/Test/VectorTest.h

@@ -32,6 +32,7 @@ class VectorTest: public QObject {
         void addSubstract();
         void length();
         void normalized();
+        void product();
         void angle();
         void negative();
 

src/Math/Vector.h

@@ -172,6 +172,16 @@ template<class T, size_t size> class Vector {
             return *this/length();
         }
 
+        /** @brief Product of values in the vector */
+        T product() const {
+            T out = 1;
+
+            for(size_t i = 0; i != size; ++i)
+                out *= at(i);
+
+            return out;
+        }
+
     private:
         T _data[size];
 };