Add explicit ctor for diagonal to sparse conversion

2 files changed, 11 insertions, 0 deletions

diff --git a/Eigen/src/SparseCore/SparseMatrix.h b/Eigen/src/SparseCore/SparseMatrix.h
index 01fcaace8..f18829866 100644
--- a/Eigen/src/SparseCore/SparseMatrix.h
+++ b/Eigen/src/SparseCore/SparseMatrix.h
@@ -695,6 +695,15 @@ class SparseMatrix
       initAssignment(other);
       other.evalTo(*this);
     }
+    
+    /** \brief Copy constructor with in-place evaluation */
+    template<typename OtherDerived>
+    explicit SparseMatrix(const DiagonalBase<OtherDerived>& other)
+      : Base(), m_outerSize(0), m_innerSize(0), m_outerIndex(0), m_innerNonZeros(0)
+    {
+      check_template_parameters();
+      *this = other.derived();
+    }
 
     /** Swaps the content of two sparse matrices of the same type.
       * This is a fast operation that simply swaps the underlying pointers and parameters. */
diff --git a/test/sparse_basic.cpp b/test/sparse_basic.cpp
index 2ebf4d420..492b3a4f2 100644
--- a/test/sparse_basic.cpp
+++ b/test/sparse_basic.cpp
@@ -372,6 +372,8 @@ template<typename SparseMatrixType> void sparse_basic(const SparseMatrixType& re
     SparseMatrixType m2(rows, rows);
     m2 = d.asDiagonal();
     VERIFY_IS_APPROX(m2, refMat2);
+    SparseMatrixType m3(d.asDiagonal());
+    VERIFY_IS_APPROX(m3, refMat2);
     refMat2 += d.asDiagonal();
     m2 += d.asDiagonal();
     VERIFY_IS_APPROX(m2, refMat2);