# HG changeset patch
# User Mayank Agarwal <mayank007.win@gmail.com>
# Date 1520885089 -19800
#      Tue Mar 13 01:34:49 2018 +0530
# Node ID ca6f308b87eb9e87e59aff37c4b68eb30188072c
# Parent  306356e228ecbc70ddc0bcd5880bfa9acb9a16e7
Added eigen_assert() to constructor of class Diagonal.

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
@@ -65,17 +65,19 @@ template<typename MatrixType, int _DiagI
 {
   public:
 
     enum { DiagIndex = _DiagIndex };
     typedef typename internal::dense_xpr_base<Diagonal>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(Diagonal)
 
     EIGEN_DEVICE_FUNC
-    explicit inline Diagonal(MatrixType& matrix, Index a_index = DiagIndex) : m_matrix(matrix), m_index(a_index) {}
+    explicit inline Diagonal(MatrixType& matrix, Index a_index = DiagIndex) : m_matrix(matrix), m_index(a_index) {
+      eigen_assert(a_index <= this->cols() &&  (-a_index) <= this->rows());
+    }
 
     EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Diagonal)
 
     EIGEN_DEVICE_FUNC
     inline Index rows() const
     {
       return m_index.value()<0 ? numext::mini<Index>(m_matrix.cols(),m_matrix.rows()+m_index.value())
                                : numext::mini<Index>(m_matrix.rows(),m_matrix.cols()-m_index.value());