text: // This file is part of Eigen, a lightweight C++ template library
  // for linear algebra.
  //
  // Copyright (C) 2007 Michael Olbrich <michael.olbrich@gmx.net>
  // Copyright (C) 2006-2010 Benoit Jacob <jacob.benoit.1@gmail.com>
  // Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
  //
  // This Source Code Form is subject to the terms of the Mozilla
  // Public License v. 2.0. If a copy of the MPL was not distributed
  // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
  #ifndef EIGEN_ASSIGN_H
  #define EIGEN_ASSIGN_H
  
  namespace Eigen {
  
  template<typename Derived>
  template<typename OtherDerived>
  EIGEN_STRONG_INLINE Derived& DenseBase<Derived>
    ::lazyAssign(const DenseBase<OtherDerived>& other)
  {
    enum{
      SameType = internal::is_same<typename Derived::Scalar,typename OtherDerived::Scalar>::value
    };
  
    EIGEN_STATIC_ASSERT_LVALUE(Derived)
    EIGEN_STATIC_ASSERT_SAME_MATRIX_SIZE(Derived,OtherDerived)
    EIGEN_STATIC_ASSERT(SameType,YOU_MIXED_DIFFERENT_NUMERIC_TYPES__YOU_NEED_TO_USE_THE_CAST_METHOD_OF_MATRIXBASE_TO_CAST_NUMERIC_TYPES_EXPLICITLY)
  
    eigen_assert(rows() == other.rows() && cols() == other.cols());
    internal::call_assignment_no_alias(derived(),other.derived());
  
    return derived();
  }
  
  template<typename Derived>
  template<typename OtherDerived>
  EIGEN_DEVICE_FUNC
  EIGEN_STRONG_INLINE Derived& DenseBase<Derived>::operator=(const DenseBase<OtherDerived>& other)
  {
    internal::call_assignment(derived(), other.derived());
    return derived();
  }
  
  template<typename Derived>
  EIGEN_DEVICE_FUNC
  EIGEN_STRONG_INLINE Derived& DenseBase<Derived>::operator=(const DenseBase& other)
  {
    internal::call_assignment(derived(), other.derived());
    return derived();
  }
  
  template<typename Derived>
  EIGEN_DEVICE_FUNC
  EIGEN_STRONG_INLINE Derived& MatrixBase<Derived>::operator=(const MatrixBase& other)
  {
    internal::call_assignment(derived(), other.derived());
    return derived();
  }
  
  template<typename Derived>
  template <typename OtherDerived>
  EIGEN_DEVICE_FUNC
  EIGEN_STRONG_INLINE Derived& MatrixBase<Derived>::operator=(const DenseBase<OtherDerived>& other)
  {
    internal::call_assignment(derived(), other.derived());
    return derived();
  }
  
  template<typename Derived>
  template <typename OtherDerived>
  EIGEN_DEVICE_FUNC
  EIGEN_STRONG_INLINE Derived& MatrixBase<Derived>::operator=(const EigenBase<OtherDerived>& other)
  {
    internal::call_assignment(derived(), other.derived());
    return derived();
  }
  
  template<typename Derived>
  template<typename OtherDerived>
  EIGEN_DEVICE_FUNC
  EIGEN_STRONG_INLINE Derived& MatrixBase<Derived>::operator=(const ReturnByValue<OtherDerived>& other)
  {
    other.derived().evalTo(derived());
    return derived();
  }
  
  } // end namespace Eigen
  
  #endif // EIGEN_ASSIGN_H
  