Function value

ThirdParty/Eigen/src/SparseCore/SparseBlock.h:559–559

  inline Index col()    const { return IsRowMajor ? index() : 0; }

  inline Scalar value() const { return m_it.value(); }
  inline Scalar& valueRef() { return m_it.valueRef(); }

  inline OuterVectorInnerIterator& operator++()