update

2025-09-22 17:49:02 +08:00
parent 5b00715f84
commit 4ae2cc3fde
412 changed files with 174195 additions and 0 deletions
--- a/2025.09.22_cpp_with_eigen_package/Eigen/src/misc/Kernel.h
+++ b/2025.09.22_cpp_with_eigen_package/Eigen/src/misc/Kernel.h
@@ -0,0 +1,77 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_MISC_KERNEL_H
+#define EIGEN_MISC_KERNEL_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+/** \class kernel_retval_base
+ *
+ */
+template <typename DecompositionType>
+struct traits<kernel_retval_base<DecompositionType> > {
+  typedef typename DecompositionType::MatrixType MatrixType;
+  typedef Matrix<typename MatrixType::Scalar,
+                 MatrixType::ColsAtCompileTime,  // the number of rows in the "kernel matrix"
+                                                 // is the number of cols of the original matrix
+                                                 // so that the product "matrix * kernel = zero" makes sense
+                 Dynamic,                        // we don't know at compile-time the dimension of the kernel
+                 traits<MatrixType>::Options,
+                 MatrixType::MaxColsAtCompileTime,  // see explanation for 2nd template parameter
+                 MatrixType::MaxColsAtCompileTime   // the kernel is a subspace of the domain space,
+                                                    // whose dimension is the number of columns of the original matrix
+                 >
+      ReturnType;
+};
+
+template <typename DecompositionType_>
+struct kernel_retval_base : public ReturnByValue<kernel_retval_base<DecompositionType_> > {
+  typedef DecompositionType_ DecompositionType;
+  typedef ReturnByValue<kernel_retval_base> Base;
+
+  explicit kernel_retval_base(const DecompositionType& dec)
+      : m_dec(dec), m_rank(dec.rank()), m_cols(m_rank == dec.cols() ? 1 : dec.cols() - m_rank) {}
+
+  inline Index rows() const { return m_dec.cols(); }
+  inline Index cols() const { return m_cols; }
+  inline Index rank() const { return m_rank; }
+  inline const DecompositionType& dec() const { return m_dec; }
+
+  template <typename Dest>
+  inline void evalTo(Dest& dst) const {
+    static_cast<const kernel_retval<DecompositionType>*>(this)->evalTo(dst);
+  }
+
+ protected:
+  const DecompositionType& m_dec;
+  Index m_rank, m_cols;
+};
+
+}  // end namespace internal
+
+#define EIGEN_MAKE_KERNEL_HELPERS(DecompositionType)                   \
+  typedef typename DecompositionType::MatrixType MatrixType;           \
+  typedef typename MatrixType::Scalar Scalar;                          \
+  typedef typename MatrixType::RealScalar RealScalar;                  \
+  typedef Eigen::internal::kernel_retval_base<DecompositionType> Base; \
+  using Base::dec;                                                     \
+  using Base::rank;                                                    \
+  using Base::rows;                                                    \
+  using Base::cols;                                                    \
+  kernel_retval(const DecompositionType& dec) : Base(dec) {}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_MISC_KERNEL_H