add coeff(int,int), coeff(int) and value() functions to the inner product specialization

1 files changed, 10 insertions, 1 deletions

diff --git a/Eigen/src/Core/Product.h b/Eigen/src/Core/Product.h
index d70344deb..71203a362 100644
--- a/Eigen/src/Core/Product.h
+++ b/Eigen/src/Core/Product.h
@@ -164,11 +164,20 @@ class GeneralProduct<Lhs, Rhs, InnerProduct>
 
     GeneralProduct(const Lhs& lhs, const Rhs& rhs) : Base(lhs,rhs) {}
 
+    EIGEN_STRONG_INLINE Scalar value() const
+    {
+      return (m_lhs.transpose().cwise()*m_rhs).sum();
+    }
+
     template<typename Dest> void scaleAndAddTo(Dest& dst, Scalar alpha) const
     {
       ei_assert(dst.rows()==1 && dst.cols()==1);
-      dst.coeffRef(0,0) += alpha * (m_lhs.transpose().cwise()*m_rhs).sum();
+      dst.coeffRef(0,0) += alpha * value();
     }
+
+    EIGEN_STRONG_INLINE Scalar coeff(int, int) const { return value(); }
+
+    EIGEN_STRONG_INLINE Scalar coeff(int) const { return value(); }
 };
 
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