From 37054987217d04cf649ba86324092bc14e9f0788 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 26 Aug 2009 00:24:22 +0200
Subject: [PATCH] add coeff(int,int), coeff(int) and value() functions to the
 inner product specialization

---
 Eigen/src/Core/Product.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

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(); }
 };
 
 /***********************************************************************