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include/Eigen/src/SparseCore/SparseFuzzy.h

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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008-2014 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// 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_SPARSE_FUZZY_H
+#define EIGEN_SPARSE_FUZZY_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+template <typename Derived>
+template <typename OtherDerived>
+bool SparseMatrixBase<Derived>::isApprox(const SparseMatrixBase<OtherDerived>& other, const RealScalar& prec) const {
+  const typename internal::nested_eval<Derived, 2, PlainObject>::type actualA(derived());
+  std::conditional_t<bool(IsRowMajor) == bool(OtherDerived::IsRowMajor),
+                     const typename internal::nested_eval<OtherDerived, 2, PlainObject>::type, const PlainObject>
+      actualB(other.derived());
+
+  return (actualA - actualB).squaredNorm() <= prec * prec * numext::mini(actualA.squaredNorm(), actualB.squaredNorm());
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_SPARSE_FUZZY_H