From dfdad129a3c6d5437eb001f5fe6d37de3fc07238 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Fri, 28 Dec 2007 16:00:55 +0000
Subject: move Core/ to a src/ subdir, in preparation for following changes

---
 Eigen/src/Core/OperatorEquals.h | 131 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 Eigen/src/Core/OperatorEquals.h

(limited to 'Eigen/src/Core/OperatorEquals.h')

diff --git a/Eigen/src/Core/OperatorEquals.h b/Eigen/src/Core/OperatorEquals.h
new file mode 100644
index 000000000..30d42b670
--- /dev/null
+++ b/Eigen/src/Core/OperatorEquals.h
@@ -0,0 +1,131 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra. Eigen itself is part of the KDE project.
+//
+// Copyright (C) 2007 Michael Olbrich <michael.olbrich@gmx.net>
+// 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_OPERATOREQUALS_H
+#define EIGEN_OPERATOREQUALS_H
+
+template<typename Derived1, typename Derived2, int UnrollCount, int Rows>
+struct MatrixOperatorEqualsUnroller
+{
+  static const int col = (UnrollCount-1) / Rows;
+  static const int row = (UnrollCount-1) % Rows;
+
+  static void run(Derived1 &dst, const Derived2 &src)
+  {
+    MatrixOperatorEqualsUnroller<Derived1, Derived2, UnrollCount-1, Rows>::run(dst, src);
+    dst.coeffRef(row, col) = src.coeff(row, col);
+  }
+};
+
+// prevent buggy user code from causing an infinite recursion
+template<typename Derived1, typename Derived2, int UnrollCount>
+struct MatrixOperatorEqualsUnroller<Derived1, Derived2, UnrollCount, 0>
+{
+  static void run(Derived1 &, const Derived2 &) {}
+};
+
+template<typename Derived1, typename Derived2, int Rows>
+struct MatrixOperatorEqualsUnroller<Derived1, Derived2, 1, Rows>
+{
+  static void run(Derived1 &dst, const Derived2 &src)
+  {
+    dst.coeffRef(0, 0) = src.coeff(0, 0);
+  }
+};
+
+template<typename Derived1, typename Derived2, int Rows>
+struct MatrixOperatorEqualsUnroller<Derived1, Derived2, Dynamic, Rows>
+{
+  static void run(Derived1 &, const Derived2 &) {}
+};
+
+template<typename Derived1, typename Derived2, int UnrollCount>
+struct VectorOperatorEqualsUnroller
+{
+  static const int index = UnrollCount - 1;
+
+  static void run(Derived1 &dst, const Derived2 &src)
+  {
+    VectorOperatorEqualsUnroller<Derived1, Derived2, UnrollCount-1>::run(dst, src);
+    dst.coeffRef(index) = src.coeff(index);
+  }
+};
+
+// prevent buggy user code from causing an infinite recursion
+template<typename Derived1, typename Derived2>
+struct VectorOperatorEqualsUnroller<Derived1, Derived2, 0>
+{
+  static void run(Derived1 &, const Derived2 &) {}
+};
+
+template<typename Derived1, typename Derived2>
+struct VectorOperatorEqualsUnroller<Derived1, Derived2, 1>
+{
+  static void run(Derived1 &dst, const Derived2 &src)
+  {
+    dst.coeffRef(0) = src.coeff(0);
+  }
+};
+
+template<typename Derived1, typename Derived2>
+struct VectorOperatorEqualsUnroller<Derived1, Derived2, Dynamic>
+{
+  static void run(Derived1 &, const Derived2 &) {}
+};
+
+template<typename Scalar, typename Derived>
+template<typename OtherDerived>
+Derived& MatrixBase<Scalar, Derived>
+  ::operator=(const MatrixBase<Scalar, OtherDerived>& other)
+{
+  if(IsVectorAtCompileTime && OtherDerived::IsVectorAtCompileTime) // copying a vector expression into a vector
+  {
+    assert(size() == other.size());
+    if(EIGEN_UNROLLED_LOOPS && SizeAtCompileTime != Dynamic && SizeAtCompileTime <= 25)
+      VectorOperatorEqualsUnroller
+        <Derived, OtherDerived, SizeAtCompileTime>::run
+          (*static_cast<Derived*>(this), *static_cast<const OtherDerived*>(&other));
+    else
+      for(int i = 0; i < size(); i++)
+        coeffRef(i) = other.coeff(i);
+    return *static_cast<Derived*>(this);
+  }
+  else // all other cases (typically, but not necessarily, copying a matrix)
+  {
+    assert(rows() == other.rows() && cols() == other.cols());
+    if(EIGEN_UNROLLED_LOOPS && SizeAtCompileTime != Dynamic && SizeAtCompileTime <= 25)
+      MatrixOperatorEqualsUnroller
+        <Derived, OtherDerived, SizeAtCompileTime, RowsAtCompileTime>::run
+          (*static_cast<Derived*>(this), *static_cast<const OtherDerived*>(&other));
+    else
+      for(int j = 0; j < cols(); j++) //traverse in column-dominant order
+        for(int i = 0; i < rows(); i++)
+          coeffRef(i, j) = other.coeff(i, j);
+    return *static_cast<Derived*>(this);
+  }
+}
+
+#endif // EIGEN_OPERATOREQUALS_H
-- 
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