aargh, had forgotten to 'svn add' a file. Yeah, 'svn st' is my friend, i know...
diff --git a/src/internal/Column.h b/src/internal/Column.h
new file mode 100644
index 0000000..f83028e
--- /dev/null
+++ b/src/internal/Column.h
@@ -0,0 +1,83 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra. Eigen itself is part of the KDE project.
+//
+// Copyright (C) 2006-2007 Benoit Jacob <jacob@math.jussieu.fr>
+//
+// Eigen is free software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along
+// with Eigen; if not, write to the Free Software Foundation, Inc., 51
+// Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// As a special exception, if other files instantiate templates or use macros
+// or functions from this file, or you compile this file and link it
+// with other works to produce a work based on this file, this file does not
+// by itself cause the resulting work to be covered by the GNU General Public
+// License. This exception does not invalidate any other reasons why a work
+// based on this file might be covered by the GNU General Public License.
+
+#ifndef EI_COLUMN_H
+#define EI_COLUMN_H
+
+template<typename MatrixType> class EiColumn
+ : public EiObject<typename MatrixType::Scalar, EiColumn<MatrixType> >
+{
+ public:
+ typedef typename MatrixType::Scalar Scalar;
+ typedef typename MatrixType::Ref MatRef;
+ friend class EiObject<Scalar, EiColumn<MatrixType> >;
+
+ static const int RowsAtCompileTime = MatrixType::RowsAtCompileTime,
+ ColsAtCompileTime = 1;
+
+ EiColumn(const MatRef& matrix, int col)
+ : m_matrix(matrix), m_col(col)
+ {
+ EI_CHECK_COL_RANGE(matrix, col);
+ }
+
+ EiColumn(const EiColumn& other)
+ : m_matrix(other.m_matrix), m_col(other.m_col) {}
+
+ EI_INHERIT_ASSIGNMENT_OPERATORS(EiColumn)
+
+ private:
+ EiColumn& _ref() { return *this; }
+ const EiColumn& _constRef() const { return *this; }
+ int _rows() const { return m_matrix.rows(); }
+ int _cols() const { return 1; }
+
+ Scalar& _write(int row, int col=0)
+ {
+ EI_UNUSED(col);
+ EI_CHECK_ROW_RANGE(*this, row);
+ return m_matrix.write(row, m_col);
+ }
+
+ Scalar _read(int row, int col=0) const
+ {
+ EI_UNUSED(col);
+ EI_CHECK_ROW_RANGE(*this, row);
+ return m_matrix.read(row, m_col);
+ }
+
+ protected:
+ MatRef m_matrix;
+ const int m_col;
+};
+
+template<typename Scalar, typename Derived>
+EiColumn<Derived>
+EiObject<Scalar, Derived>::col(int i)
+{
+ return EiColumn<Derived>(static_cast<Derived*>(this)->ref(), i);
+}
+
+#endif // EI_COLUMN_H
