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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.
+//
+// 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 <sstream>
+
+#include "main.h"
+
+template <typename From, typename To>
+void test_conversion() {
+  typedef Array<From, Dynamic, 1> ArrayXFrom;
+  typedef Array<To, Dynamic, 1> ArrayXTo;
+  typedef Array<double, Dynamic, 1> ArrayXDouble;
+
+  Index size = internal::random<Index>(1, EIGEN_TEST_MAX_SIZE);
+  double from_min = static_cast<double>((std::numeric_limits<From>::min)());
+  double from_range = static_cast<double>((std::numeric_limits<From>::max)()) - from_min;
+
+  // ArrayXFrom::Random() only generates 32-bit values (#2749), so we generate
+  // doubles and scale to fit the range.
+  ArrayXDouble doubles = (ArrayXDouble::Random(size) + 1.0) * (from_range / 2.0) + from_min;
+  ArrayXFrom from = doubles.template cast<From>();
+  ArrayXTo to(size);
+  for (Index i = 0; i < size; ++i) {
+    to(i) = static_cast<To>(from(i));
+  }
+  VERIFY_IS_APPROX(from.template cast<To>(), to);
+}
+
+template <typename To>
+void test_conversion_to() {
+  CALL_SUBTEST((test_conversion<int64_t, To>()));
+  CALL_SUBTEST((test_conversion<uint64_t, To>()));
+  CALL_SUBTEST((test_conversion<int32_t, To>()));
+  CALL_SUBTEST((test_conversion<uint32_t, To>()));
+  CALL_SUBTEST((test_conversion<int16_t, To>()));
+  CALL_SUBTEST((test_conversion<uint16_t, To>()));
+  CALL_SUBTEST((test_conversion<int8_t, To>()));
+  CALL_SUBTEST((test_conversion<uint8_t, To>()));
+}
+
+EIGEN_DECLARE_TEST(float_conversion) {
+  for (int i = 0; i < g_repeat; i++) {
+    CALL_SUBTEST(test_conversion_to<float>());
+    CALL_SUBTEST(test_conversion_to<double>());
+  }
+}