text: // This file is part of Eigen, a lightweight C++ template library
  // for linear algebra.
  //
  // Copyright (C) 2008-2009 Gael Guennebaud <gael.guennebaud@inria.fr>
  // Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
  //
  // Eigen is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 3 of the License, or (at your option) any later version.
  //
  // Alternatively, you can redistribute it and/or
  // modify it under the terms of the GNU General Public License as
  // published by the Free Software Foundation; either version 2 of
  // the License, or (at your option) any later version.
  //
  // Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
  // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  // FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
  // GNU General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License and a copy of the GNU General Public License along with
  // Eigen. If not, see <http://www.gnu.org/licenses/>.
  
  // This file is a base class plugin containing common coefficient wise functions.
  
  /** \returns an expression of the difference of \c *this and \a other
    *
    * \note If you want to substract a given scalar from all coefficients, see Cwise::operator-().
    *
    * \sa class CwiseBinaryOp, operator-=()
    */
  EIGEN_MAKE_CWISE_BINARY_OP(operator-,ei_scalar_difference_op)
  
  /** \returns an expression of the sum of \c *this and \a other
    *
    * \note If you want to add a given scalar to all coefficients, see Cwise::operator+().
    *
    * \sa class CwiseBinaryOp, operator+=()
    */
  EIGEN_MAKE_CWISE_BINARY_OP(operator+,ei_scalar_sum_op)
  
  /** \returns an expression of a custom coefficient-wise operator \a func of *this and \a other
    *
    * The template parameter \a CustomBinaryOp is the type of the functor
    * of the custom operator (see class CwiseBinaryOp for an example)
    *
    * Here is an example illustrating the use of custom functors:
    * \include class_CwiseBinaryOp.cpp
    * Output: \verbinclude class_CwiseBinaryOp.out
    *
    * \sa class CwiseBinaryOp, operator+, operator-, cwiseProduct
    */
  template<typename CustomBinaryOp, typename OtherDerived>
  EIGEN_STRONG_INLINE const CwiseBinaryOp<CustomBinaryOp, Derived, OtherDerived>
  binaryExpr(const EIGEN_CURRENT_STORAGE_BASE_CLASS<OtherDerived> &other, const CustomBinaryOp& func = CustomBinaryOp()) const
  {
    return CwiseBinaryOp<CustomBinaryOp, Derived, OtherDerived>(derived(), other.derived(), func);
  }
  
  