Hello, World!

This is the initial commit for Eigen2, since I restarted it from scratch on Sunday.
2026-04-10 11:34:33 +08:00 · 2007-09-05 10:42:15 +00:00
parent 7eeb620880
commit 1dabb45d94
18 changed files with 1816 additions and 0 deletions
--- a/src/ScalarOps.h
+++ b/src/ScalarOps.h
@@ -0,0 +1,121 @@
+// 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_SCALAROPS_H
+#define EIGEN_SCALAROPS_H
+
+namespace Eigen {
+
+template<typename MatrixType> class ScalarProduct
+{
+  public:
+    typedef typename MatrixType::Scalar Scalar;
+
+    ScalarProduct(const MatrixType& matrix, Scalar scalar)
+      : m_matrix(matrix), m_scalar(scalar) {}
+
+    ScalarProduct(const ScalarProduct& other)
+      : m_matrix(other.m_matrix), m_scalar(other.m_scalar) {}
+
+    int rows() const { return m_matrix.rows(); }
+    int cols() const { return m_matrix.cols(); }
+
+    Scalar operator()(int row, int col) const
+    {
+      return m_matrix(row, col) * m_scalar;
+    }
+
+  protected:
+    const MatrixType m_matrix;
+    const Scalar     m_scalar;
+};
+
+template<typename Content>
+const MatrixConstXpr<
+  const ScalarProduct<
+    MatrixConstXpr<Content>
+  >
+>
+operator *(const MatrixConstXpr<Content>& xpr,
+                typename Content::Scalar scalar)
+{
+  typedef const ScalarProduct<
+              MatrixConstXpr<Content>
+            > ProductType;
+  typedef const MatrixConstXpr<ProductType> XprType;
+  return XprType(ProductType(xpr, scalar));
+}
+
+template<typename Content>
+const MatrixConstXpr<
+  const ScalarProduct<
+    MatrixConstXpr<Content>
+  >
+>
+operator *(typename Content::Scalar scalar,
+                const MatrixConstXpr<Content>& xpr)
+{
+  typedef const ScalarProduct<
+              MatrixConstXpr<Content>
+            > ProductType;
+  typedef const MatrixConstXpr<ProductType> XprType;
+  return XprType(ProductType(xpr, scalar));
+}
+
+template<typename Derived>
+const MatrixConstXpr<
+  const ScalarProduct<
+    MatrixConstRef<MatrixBase<Derived> >
+  >
+>
+operator *(const MatrixBase<Derived>& matrix,
+                typename Derived::Scalar scalar)
+{
+  typedef const ScalarProduct<
+              MatrixConstRef<MatrixBase<Derived> >
+            > ProductType;
+  typedef const MatrixConstXpr<ProductType> XprType;
+  return XprType(ProductType(matrix.constRef(), scalar));
+}
+
+template<typename Derived>
+const MatrixConstXpr<
+  const ScalarProduct<
+    MatrixConstRef<MatrixBase<Derived> >
+  >
+>
+operator *(typename Derived::Scalar scalar,
+                const MatrixBase<Derived>& matrix)
+{
+  typedef const ScalarProduct<
+              MatrixConstRef<MatrixBase<Derived> >
+            > ProductType;
+  typedef const MatrixConstXpr<ProductType> XprType;
+  return XprType(ProductType(matrix.constRef(), scalar));
+}
+
+} // namespace Eigen
+
+#endif // EIGEN_SCALAROPS_H