initial commit

2026-10-22 09:23:54 +08:00
commit 63f557a39f
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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2011 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/.
+
+#include "main.h"
+
+template <typename MatrixType>
+void zeroReduction(const MatrixType& m) {
+  // Reductions that must hold for zero sized objects
+  VERIFY(m.all());
+  VERIFY(!m.any());
+  VERIFY(m.prod() == 1);
+  VERIFY(m.sum() == 0);
+  VERIFY(m.norm() == 0);
+  VERIFY(m.squaredNorm() == 0);
+  VERIFY(m.count() == 0);
+  VERIFY(m.allFinite());
+  VERIFY(!m.hasNaN());
+  VERIFY_RAISES_ASSERT(m.minCoeff());
+  VERIFY_RAISES_ASSERT(m.maxCoeff());
+  Index i, j;
+  EIGEN_UNUSED_VARIABLE(i);  // Only used if exceptions are enabled.
+  EIGEN_UNUSED_VARIABLE(j);
+  VERIFY_RAISES_ASSERT(m.minCoeff(&i, &j));
+  VERIFY_RAISES_ASSERT(m.maxCoeff(&i, &j));
+  VERIFY_RAISES_ASSERT(m.reshaped().minCoeff(&i));
+  VERIFY_RAISES_ASSERT(m.reshaped().maxCoeff(&i));
+}
+
+template <typename MatrixType>
+void zeroSizedMatrix() {
+  MatrixType t1;
+  typedef typename MatrixType::Scalar Scalar;
+
+  if (MatrixType::SizeAtCompileTime == Dynamic || MatrixType::SizeAtCompileTime == 0) {
+    zeroReduction(t1);
+    if (MatrixType::RowsAtCompileTime == Dynamic) VERIFY(t1.rows() == 0);
+    if (MatrixType::ColsAtCompileTime == Dynamic) VERIFY(t1.cols() == 0);
+
+    if (MatrixType::RowsAtCompileTime == Dynamic && MatrixType::ColsAtCompileTime == Dynamic) {
+      MatrixType t2(0, 0);
+      VERIFY(t2.rows() == 0);
+      VERIFY(t2.cols() == 0);
+
+      zeroReduction(t2);
+      VERIFY(t1 == t2);
+    }
+  }
+
+  if (MatrixType::MaxColsAtCompileTime != 0 && MatrixType::MaxRowsAtCompileTime != 0) {
+    Index rows = MatrixType::RowsAtCompileTime == Dynamic ? internal::random<Index>(1, 10)
+                                                          : Index(MatrixType::RowsAtCompileTime);
+    Index cols = MatrixType::ColsAtCompileTime == Dynamic ? internal::random<Index>(1, 10)
+                                                          : Index(MatrixType::ColsAtCompileTime);
+    MatrixType m(rows, cols);
+    zeroReduction(m.template block<0, MatrixType::ColsAtCompileTime>(0, 0, 0, cols));
+    zeroReduction(m.template block<MatrixType::RowsAtCompileTime, 0>(0, 0, rows, 0));
+    zeroReduction(m.template block<0, 1>(0, 0));
+    zeroReduction(m.template block<1, 0>(0, 0));
+    Matrix<Scalar, Dynamic, Dynamic> prod = m.template block<MatrixType::RowsAtCompileTime, 0>(0, 0, rows, 0) *
+                                            m.template block<0, MatrixType::ColsAtCompileTime>(0, 0, 0, cols);
+    VERIFY(prod.rows() == rows && prod.cols() == cols);
+    VERIFY(prod.isZero());
+    prod = m.template block<1, 0>(0, 0) * m.template block<0, 1>(0, 0);
+    VERIFY(prod.size() == 1);
+    VERIFY(prod.isZero());
+  }
+}
+
+template <typename VectorType>
+void zeroSizedVector() {
+  VectorType t1;
+
+  if (VectorType::SizeAtCompileTime == Dynamic || VectorType::SizeAtCompileTime == 0) {
+    zeroReduction(t1);
+    VERIFY(t1.size() == 0);
+    VectorType t2(DenseIndex(0));  // DenseIndex disambiguates with 0-the-null-pointer (error with gcc 4.4 and MSVC8)
+    VERIFY(t2.size() == 0);
+    zeroReduction(t2);
+
+    VERIFY(t1 == t2);
+  }
+}
+
+EIGEN_DECLARE_TEST(zerosized) {
+  zeroSizedMatrix<Matrix2d>();
+  zeroSizedMatrix<Matrix3i>();
+  zeroSizedMatrix<Matrix<float, 2, Dynamic> >();
+  zeroSizedMatrix<MatrixXf>();
+  zeroSizedMatrix<Matrix<float, 0, 0> >();
+  zeroSizedMatrix<Matrix<float, Dynamic, 0, 0, 0, 0> >();
+  zeroSizedMatrix<Matrix<float, 0, Dynamic, 0, 0, 0> >();
+  zeroSizedMatrix<Matrix<float, Dynamic, Dynamic, 0, 0, 0> >();
+  zeroSizedMatrix<Matrix<float, 0, 4> >();
+  zeroSizedMatrix<Matrix<float, 4, 0> >();
+
+  zeroSizedVector<Vector2d>();
+  zeroSizedVector<Vector3i>();
+  zeroSizedVector<VectorXf>();
+  zeroSizedVector<Matrix<float, 0, 1> >();
+  zeroSizedVector<Matrix<float, 1, 0> >();
+}