reorganize header files, split MatrixBase into smaller files.

expose only a few meta-headers to the user, the rest moves to a internal/ subdirectory

src/internal/MatrixXpr.h

@@ -0,0 +1,108 @@
+// 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 EIGEN_MATRIXXPR_H
+#define EIGEN_MATRIXXPR_H
+
+namespace Eigen {
+
+//forward declarations
+template<typename MatrixType> class MatrixRow;
+template<typename MatrixType> class MatrixCol;
+template<typename MatrixType> class MatrixMinor;
+template<typename MatrixType> class MatrixBlock;
+
+template<typename Content> class MatrixXpr
+{
+  public:
+    typedef typename Content::Scalar Scalar;
+  
+    MatrixXpr(const Content& content)
+      : m_content(content) {}
+    
+    MatrixXpr(const MatrixXpr& other)
+      : m_content(other.m_content) {}
+    
+    ~MatrixXpr() {}
+    
+    int rows() const { return m_content.rows(); }
+    int cols() const { return m_content.cols(); }
+    
+    Scalar& write(int row, int col)
+    {
+      return m_content.write(row, col);
+    }
+    
+    Scalar read(int row, int col) const
+    {
+      return m_content.read(row, col);
+    }
+    
+    template<typename OtherContent>
+    MatrixXpr& operator=(const MatrixXpr<OtherContent>& other)
+    {
+      assert(rows() == other.rows() && cols() == other.cols());
+      for(int i = 0; i < rows(); i++)
+        for(int j = 0; j < cols(); j++)
+          write(i, j) = other.read(i, j);
+      return *this;
+    }
+    
+    //special case of the above template operator=. Strangely, g++ 4.1 failed to use
+    //that template when OtherContent == Content
+    MatrixXpr& operator=(const MatrixXpr& other)
+    {
+      assert(rows() == other.rows() && cols() == other.cols());
+      for(int i = 0; i < rows(); i++)
+        for(int j = 0; j < cols(); j++)
+          write(i, j) = other.read(i, j);
+      return *this;
+    }
+    
+    template<typename Derived>
+    MatrixXpr& operator=(const MatrixBase<Derived>& matrix);
+    
+    MatrixXpr<MatrixRow<MatrixXpr<Content> > > row(int i);
+    MatrixXpr<MatrixCol<MatrixXpr<Content> > > col(int i);
+    MatrixXpr<MatrixMinor<MatrixXpr<Content> > > minor(int row, int col);
+    MatrixXpr<MatrixBlock<MatrixXpr<Content> > >
+      block(int startRow, int endRow, int startCol= 0, int endCol = 0);
+    
+    template<typename Content2>
+    MatrixXpr& operator+=(const MatrixXpr<Content2> &other);
+    template<typename Content2>
+    MatrixXpr& operator-=(const MatrixXpr<Content2> &other);
+    template<typename Derived>
+    MatrixXpr& operator+=(MatrixBase<Derived> &matrix);
+    template<typename Derived>
+    MatrixXpr& operator-=(MatrixBase<Derived> &matrix);
+    
+  protected:
+    Content m_content;
+};
+
+} // namespace Eigen
+
+#endif // EIGEN_MATRIXXPR_H