* Added generic unary operators (replace Opposite and Conjugate)

* functor templates are not template template parameter anymore
   (this allows to make templated functors !)
 * Main page: extented compiler discussion
 * A small hack to support gcc 3.4 and 4.0 (see the main page)
 * Fix a cast type issue in Cast
 * Various doxygen updates (mainly Cwise stuff and added doxygen groups
   in MatrixBase to split the huge memeber list, still not perfect though)
 * Updated Gael's email address

doc/examples/class_CwiseBinaryOp.cpp

@@ -0,0 +1,27 @@
+#include <Eigen/Core>
+USING_PART_OF_NAMESPACE_EIGEN
+using namespace std;
+
+// define a custom template binary functor
+struct CwiseMinOp {
+    template<typename Scalar>
+    static Scalar op(const Scalar& a, const Scalar& b) { return std::min(a,b); }
+};
+
+// define a custom binary operator between two matrices
+template<typename Scalar, typename Derived1, typename Derived2>
+const Eigen::CwiseBinaryOp<CwiseMinOp, Derived1, Derived2>
+cwiseMin(const MatrixBase<Scalar, Derived1> &mat1, const MatrixBase<Scalar, Derived2> &mat2)
+{
+  return Eigen::CwiseBinaryOp<CwiseMinOp, Derived1, Derived2>(mat1.ref(), mat2.ref());
+  // Note that the above is equivalent to:
+  // return mat1.template cwise<CwiseMinOp>(mat2);
+}
+
+int main(int, char**)
+{
+  Matrix4d m1 = Matrix4d::random(), m2 = Matrix4d::random();
+  cout << cwiseMin(m1,m2) << endl;          // use our new global operator
+  cout << m1.cwise<CwiseMinOp>(m2) << endl; // directly use the generic expression member
+  return 0;
+}