Reduced the use of raw pointers

Direction.cpp

@@ -9,6 +9,7 @@
 
 #include <math.h>
 
+namespace LinearAlgebra {
 template <typename T>
 DirectionOf<T>::DirectionOf() {
   this->horizontal = AngleOf<T>();
@@ -98,5 +99,6 @@ void DirectionOf<T>::Normalize() {
   }
 }
 
-template class DirectionOf<float>;
-template class DirectionOf<signed short>;
+template class LinearAlgebra::DirectionOf<float>;
+template class LinearAlgebra::DirectionOf<signed short>;
+}

Direction.h

@@ -99,6 +99,4 @@ using Direction = DirectionSingle;
 
 }  // namespace LinearAlgebra
 
-using namespace LinearAlgebra;
-
 #endif

Polar.cpp

@@ -175,5 +175,5 @@ PolarOf<T> PolarOf<T>::Rotate(const PolarOf& v, AngleOf<T> angle) {
   return r;
 }
 
-template class PolarOf<float>;
-template class PolarOf<signed short>;
+template class LinearAlgebra::PolarOf<float>;
+template class LinearAlgebra::PolarOf<signed short>;

Spherical.cpp

@@ -5,6 +5,8 @@
 
 #include <math.h>
 
+namespace LinearAlgebra {
+
 template <typename T>
 SphericalOf<T>::SphericalOf() {
   this->distance = 0.0f;
@@ -301,3 +303,5 @@ SphericalOf<T> SphericalOf<T>::RotateVertical(const SphericalOf<T>& v,
 
 template class SphericalOf<float>;
 template class SphericalOf<signed short>;
+
+}  // namespace LinearAlgebra

Spherical.h

@@ -186,7 +186,6 @@ using Spherical = SphericalSingle;
 #endif
 
 }  // namespace LinearAlgebra
-using namespace LinearAlgebra;
 
 #include "Polar.h"
 #include "Vector3.h"

SwingTwist.cpp

@@ -4,6 +4,8 @@
 
 #include "SwingTwist.h"
 
+namespace LinearAlgebra {
+
 template <typename T>
 SwingTwistOf<T>::SwingTwistOf() {
   this->swing = DirectionOf<T>(AngleOf<T>(), AngleOf<T>());
@@ -166,3 +168,5 @@ void SwingTwistOf<T>::Normalize() {
 
 template class SwingTwistOf<float>;
 template class SwingTwistOf<signed short>;
+
+}

test/Direction_test.cc

@@ -6,6 +6,8 @@
 
 #include "Direction.h"
 
+using namespace LinearAlgebra;
+
 #define FLOAT_INFINITY std::numeric_limits<float>::infinity()
 
 TEST(Direction16, Compare) {