Add smart cast functions and ctor with scalar conversion (explicit)

to all classes of the Geometry module. By smart I mean that if current
type == new type, then it returns a const reference to *this => zero overhead

1 files changed, 16 insertions, 0 deletions

diff --git a/Eigen/src/Geometry/Rotation2D.h b/Eigen/src/Geometry/Rotation2D.h
index c0bda5f69..8e8396713 100644
--- a/Eigen/src/Geometry/Rotation2D.h
+++ b/Eigen/src/Geometry/Rotation2D.h
@@ -100,6 +100,22 @@ public:
     */
   inline Rotation2D slerp(Scalar t, const Rotation2D& other) const
   { return m_angle * (1-t) + other.angle() * t; }
+
+  /** \returns \c *this with scalar type casted to \a NewScalarType
+    *
+    * Note that if \a NewScalarType is equal to the current scalar type of \c *this
+    * then this function smartly returns a const reference to \c *this.
+    */
+  template<typename NewScalarType>
+  typename ei_cast_return_type<Rotation2D,Rotation2D<NewScalarType> >::type cast() const
+  { return typename ei_cast_return_type<Rotation2D,Rotation2D<NewScalarType> >::type(*this); }
+
+  /** Copy constructor with scalar type conversion */
+  template<typename OtherScalarType>
+  explicit Rotation2D(const Rotation2D<OtherScalarType>& other)
+  {
+    m_angle = other.angle();
+  }
 };
 
 /** \ingroup GeometryModule