From 3cc9e3f5bb22c3f20efc576b7b24302cc604a64d Mon Sep 17 00:00:00 2001
From: Hauke Heibel <hauke.heibel@gmail.com>
Date: Mon, 1 Mar 2010 19:56:24 +0100
Subject: [PATCH] Fixes a compilation issue for MSVC.

---
 Eigen/src/Core/util/ForwardDeclarations.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index 8451d0ebe..aa01fdab2 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -41,8 +41,10 @@ template<typename ExpressionType> class NestByValue;
 template<typename ExpressionType> class ForceAlignedAccess;
 template<typename ExpressionType> class SwapWrapper;
 template<typename MatrixType> class Minor;
+// MSVC will not compile when the expression ei_traits<MatrixType>::Flags&DirectAccessBit
+// is put into brackets like (ei_traits<MatrixType>::Flags&DirectAccessBit)!
 template<typename MatrixType, int BlockRows=Dynamic, int BlockCols=Dynamic,
-         int _DirectAccessStatus = (ei_traits<MatrixType>::Flags&DirectAccessBit) ? HasDirectAccess : NoDirectAccess> class Block;
+         int _DirectAccessStatus = ei_traits<MatrixType>::Flags&DirectAccessBit ? HasDirectAccess : NoDirectAccess> class Block;
 template<typename MatrixType, int Size=Dynamic> class VectorBlock;
 template<typename MatrixType> class Transpose;
 template<typename MatrixType> class Conjugate;