Prevent copying with internal::noncopyable.

unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h

@@ -21,8 +21,8 @@ namespace Eigen {
   * expected to be an instantiation of the Matrix class template.
   */
 template <typename MatrixType>
-class MatrixExponential {
-
+class MatrixExponential : internal::noncopyable
+{
   public:
 
     /** \brief Constructor.
@@ -43,10 +43,6 @@ class MatrixExponential {
 
   private:
 
-    // Prevent copying
-    MatrixExponential(const MatrixExponential&);
-    MatrixExponential& operator=(const MatrixExponential&);
-
     /** \brief Compute the (3,3)-Pad&eacute; approximant to the exponential.
      *
      *  After exit, \f$ (V+U)(V-U)^{-1} \f$ is the Pad&eacute;