From de942a44c2459a19a12b0b6309cbc226867ea691 Mon Sep 17 00:00:00 2001
From: Thomas Capricelli <orzel@freehackers.org>
Date: Mon, 28 Sep 2009 01:28:48 +0200
Subject: [PATCH] default argument for _jac in functor operator() : this way,
 we can use AutoDiffJacobian::operator()(x,value) exactly as the original
 functor

---
 unsupported/Eigen/src/AutoDiff/AutoDiffJacobian.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unsupported/Eigen/src/AutoDiff/AutoDiffJacobian.h b/unsupported/Eigen/src/AutoDiff/AutoDiffJacobian.h
index 0feb577df..d42197345 100644
--- a/unsupported/Eigen/src/AutoDiff/AutoDiffJacobian.h
+++ b/unsupported/Eigen/src/AutoDiff/AutoDiffJacobian.h
@@ -56,7 +56,7 @@ public:
   typedef Matrix<ActiveScalar, InputsAtCompileTime, 1> ActiveInput;
   typedef Matrix<ActiveScalar, ValuesAtCompileTime, 1> ActiveValue;
 
-  void operator() (const InputType& x, ValueType* v, JacobianType* _jac) const
+  void operator() (const InputType& x, ValueType* v, JacobianType* _jac=0) const
   {
     ei_assert(v!=0);
     if (!_jac)