# HG changeset patch
# User Mayank Agarwal <mayank007.win@gmail.com>
# Date 1520885089 -19800
#      Tue Mar 13 01:34:49 2018 +0530
# Node ID 6a56e95c4ddb61a15cfdf9f4106ff1fa8b91f432
# Parent  306356e228ecbc70ddc0bcd5880bfa9acb9a16e7
Added eigen_assert() to MatrixBase::diagonal(Index)

diff --git a/Eigen/src/Core/Diagonal.h b/Eigen/src/Core/Diagonal.h
--- a/Eigen/src/Core/Diagonal.h
+++ b/Eigen/src/Core/Diagonal.h
@@ -208,16 +208,17 @@ MatrixBase<Derived>::diagonal() const
   * Example: \include MatrixBase_diagonal_int.cpp
   * Output: \verbinclude MatrixBase_diagonal_int.out
   *
   * \sa MatrixBase::diagonal(), class Diagonal */
 template<typename Derived>
 EIGEN_DEVICE_FUNC inline typename MatrixBase<Derived>::DiagonalDynamicIndexReturnType
 MatrixBase<Derived>::diagonal(Index index)
 {
+  eigen_assert(index < MaxColsAtCompileTime && (-index) < MaxRowsAtCompileTime);
   return DiagonalDynamicIndexReturnType(derived(), index);
 }
 
 /** This is the const version of diagonal(Index). */
 template<typename Derived>
 EIGEN_DEVICE_FUNC inline typename MatrixBase<Derived>::ConstDiagonalDynamicIndexReturnType
 MatrixBase<Derived>::diagonal(Index index) const
 {