api/array_view_unittest.cc - src - Git at Google

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>

 #include "api/array_view.h"
 #include "rtc_base/buffer.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/gunit.h"
 #include "test/gmock.h"

 namespace rtc {

 namespace {

 using ::testing::ElementsAre;
 using ::testing::IsEmpty;

 template <typename T>
 void Call(ArrayView<T>) {}

 }  // namespace

 TEST(ArrayViewTest, TestConstructFromPtrAndArray) {
   char arr[] = "Arrr!";
   const char carr[] = "Carrr!";
   Call<const char>(arr);
   Call<const char>(carr);
   Call<char>(arr);
   // Call<char>(carr);  // Compile error, because can't drop const.
   // Call<int>(arr);  // Compile error, because incompatible types.
   ArrayView<int*> x;
   EXPECT_EQ(0u, x.size());
   EXPECT_EQ(nullptr, x.data());
   ArrayView<char> y = arr;
   EXPECT_EQ(6u, y.size());
   EXPECT_EQ(arr, y.data());
   ArrayView<char, 6> yf = arr;
   static_assert(yf.size() == 6, "");
   EXPECT_EQ(arr, yf.data());
   ArrayView<const char> z(arr + 1, 3);
   EXPECT_EQ(3u, z.size());
   EXPECT_EQ(arr + 1, z.data());
   ArrayView<const char, 3> zf(arr + 1, 3);
   static_assert(zf.size() == 3, "");
   EXPECT_EQ(arr + 1, zf.data());
   ArrayView<const char> w(arr, 2);
   EXPECT_EQ(2u, w.size());
   EXPECT_EQ(arr, w.data());
   ArrayView<const char, 2> wf(arr, 2);
   static_assert(wf.size() == 2, "");
   EXPECT_EQ(arr, wf.data());
   ArrayView<char> q(arr, 0);
   EXPECT_EQ(0u, q.size());
   EXPECT_EQ(nullptr, q.data());
   ArrayView<char, 0> qf(arr, 0);
   static_assert(qf.size() == 0, "");
   EXPECT_EQ(nullptr, qf.data());
 #if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
   // DCHECK error (nullptr with nonzero size).
   EXPECT_DEATH(ArrayView<int>(static_cast<int*>(nullptr), 5), "");
 #endif
   // These are compile errors, because incompatible types.
   // ArrayView<int> m = arr;
   // ArrayView<float> n(arr + 2, 2);
 }

 TEST(ArrayViewTest, TestCopyConstructorVariable) {
   char arr[] = "Arrr!";
   ArrayView<char> x = arr;
   EXPECT_EQ(6u, x.size());
   EXPECT_EQ(arr, x.data());
   ArrayView<char> y = x;  // Copy non-const -> non-const.
   EXPECT_EQ(6u, y.size());
   EXPECT_EQ(arr, y.data());
   ArrayView<const char> z = x;  // Copy non-const -> const.
   EXPECT_EQ(6u, z.size());
   EXPECT_EQ(arr, z.data());
   ArrayView<const char> w = z;  // Copy const -> const.
   EXPECT_EQ(6u, w.size());
   EXPECT_EQ(arr, w.data());
   // ArrayView<char> v = z;  // Compile error, because can't drop const.
 }

 TEST(ArrayViewTest, TestCopyConstructorFixed) {
   char arr[] = "Arrr!";
   ArrayView<char, 6> x = arr;
   static_assert(x.size() == 6, "");
   EXPECT_EQ(arr, x.data());

   // Copy fixed -> fixed.
   ArrayView<char, 6> y = x;  // Copy non-const -> non-const.
   static_assert(y.size() == 6, "");
   EXPECT_EQ(arr, y.data());
   ArrayView<const char, 6> z = x;  // Copy non-const -> const.
   static_assert(z.size() == 6, "");
   EXPECT_EQ(arr, z.data());
   ArrayView<const char, 6> w = z;  // Copy const -> const.
   static_assert(w.size() == 6, "");
   EXPECT_EQ(arr, w.data());
   // ArrayView<char, 6> v = z;  // Compile error, because can't drop const.

   // Copy fixed -> variable.
   ArrayView<char> yv = x;  // Copy non-const -> non-const.
   EXPECT_EQ(6u, yv.size());
   EXPECT_EQ(arr, yv.data());
   ArrayView<const char> zv = x;  // Copy non-const -> const.
   EXPECT_EQ(6u, zv.size());
   EXPECT_EQ(arr, zv.data());
   ArrayView<const char> wv = z;  // Copy const -> const.
   EXPECT_EQ(6u, wv.size());
   EXPECT_EQ(arr, wv.data());
   // ArrayView<char> vv = z;  // Compile error, because can't drop const.
 }

 TEST(ArrayViewTest, TestCopyAssignmentVariable) {
   char arr[] = "Arrr!";
   ArrayView<char> x(arr);
   EXPECT_EQ(6u, x.size());
   EXPECT_EQ(arr, x.data());
   ArrayView<char> y;
   y = x;  // Copy non-const -> non-const.
   EXPECT_EQ(6u, y.size());
   EXPECT_EQ(arr, y.data());
   ArrayView<const char> z;
   z = x;  // Copy non-const -> const.
   EXPECT_EQ(6u, z.size());
   EXPECT_EQ(arr, z.data());
   ArrayView<const char> w;
   w = z;  // Copy const -> const.
   EXPECT_EQ(6u, w.size());
   EXPECT_EQ(arr, w.data());
   // ArrayView<char> v;
   // v = z;  // Compile error, because can't drop const.
 }

 TEST(ArrayViewTest, TestCopyAssignmentFixed) {
   char arr[] = "Arrr!";
   char init[] = "Init!";
   ArrayView<char, 6> x(arr);
   EXPECT_EQ(arr, x.data());

   // Copy fixed -> fixed.
   ArrayView<char, 6> y(init);
   y = x;  // Copy non-const -> non-const.
   EXPECT_EQ(arr, y.data());
   ArrayView<const char, 6> z(init);
   z = x;  // Copy non-const -> const.
   EXPECT_EQ(arr, z.data());
   ArrayView<const char, 6> w(init);
   w = z;  // Copy const -> const.
   EXPECT_EQ(arr, w.data());
   // ArrayView<char, 6> v(init);
   // v = z;  // Compile error, because can't drop const.

   // Copy fixed -> variable.
   ArrayView<char> yv;
   yv = x;  // Copy non-const -> non-const.
   EXPECT_EQ(6u, yv.size());
   EXPECT_EQ(arr, yv.data());
   ArrayView<const char> zv;
   zv = x;  // Copy non-const -> const.
   EXPECT_EQ(6u, zv.size());
   EXPECT_EQ(arr, zv.data());
   ArrayView<const char> wv;
   wv = z;  // Copy const -> const.
   EXPECT_EQ(6u, wv.size());
   EXPECT_EQ(arr, wv.data());
   // ArrayView<char> v;
   // v = z;  // Compile error, because can't drop const.
 }

 TEST(ArrayViewTest, TestStdVector) {
   std::vector<int> v;
   v.push_back(3);
   v.push_back(11);
   Call<const int>(v);
   Call<int>(v);
   // Call<unsigned int>(v);  // Compile error, because incompatible types.
   ArrayView<int> x = v;
   EXPECT_EQ(2u, x.size());
   EXPECT_EQ(v.data(), x.data());
   ArrayView<const int> y;
   y = v;
   EXPECT_EQ(2u, y.size());
   EXPECT_EQ(v.data(), y.data());
   // ArrayView<double> d = v;  // Compile error, because incompatible types.
   const std::vector<int> cv;
   Call<const int>(cv);
   // Call<int>(cv);  // Compile error, because can't drop const.
   ArrayView<const int> z = cv;
   EXPECT_EQ(0u, z.size());
   EXPECT_EQ(nullptr, z.data());
   // ArrayView<int> w = cv;  // Compile error, because can't drop const.
 }

 TEST(ArrayViewTest, TestRtcBuffer) {
   rtc::Buffer b = "so buffer";
   Call<const uint8_t>(b);
   Call<uint8_t>(b);
   // Call<int8_t>(b);  // Compile error, because incompatible types.
   ArrayView<uint8_t> x = b;
   EXPECT_EQ(10u, x.size());
   EXPECT_EQ(b.data(), x.data());
   ArrayView<const uint8_t> y;
   y = b;
   EXPECT_EQ(10u, y.size());
   EXPECT_EQ(b.data(), y.data());
   // ArrayView<char> d = b;  // Compile error, because incompatible types.
   const rtc::Buffer cb = "very const";
   Call<const uint8_t>(cb);
   // Call<uint8_t>(cb);  // Compile error, because can't drop const.
   ArrayView<const uint8_t> z = cb;
   EXPECT_EQ(11u, z.size());
   EXPECT_EQ(cb.data(), z.data());
   // ArrayView<uint8_t> w = cb;  // Compile error, because can't drop const.
 }

 TEST(ArrayViewTest, TestSwapVariable) {
   const char arr[] = "Arrr!";
   const char aye[] = "Aye, Cap'n!";
   ArrayView<const char> x(arr);
   EXPECT_EQ(6u, x.size());
   EXPECT_EQ(arr, x.data());
   ArrayView<const char> y(aye);
   EXPECT_EQ(12u, y.size());
   EXPECT_EQ(aye, y.data());
   using std::swap;
   swap(x, y);
   EXPECT_EQ(12u, x.size());
   EXPECT_EQ(aye, x.data());
   EXPECT_EQ(6u, y.size());
   EXPECT_EQ(arr, y.data());
   // ArrayView<char> z;
   // swap(x, z);  // Compile error, because can't drop const.
 }

 TEST(FixArrayViewTest, TestSwapFixed) {
   const char arr[] = "Arr!";
   char aye[] = "Aye!";
   ArrayView<const char, 5> x(arr);
   EXPECT_EQ(arr, x.data());
   ArrayView<const char, 5> y(aye);
   EXPECT_EQ(aye, y.data());
   using std::swap;
   swap(x, y);
   EXPECT_EQ(aye, x.data());
   EXPECT_EQ(arr, y.data());
   // ArrayView<char, 5> z(aye);
   // swap(x, z);  // Compile error, because can't drop const.
   // ArrayView<const char, 4> w(aye, 4);
   // swap(x, w);  // Compile error, because different sizes.
 }

 TEST(ArrayViewTest, TestIndexing) {
   char arr[] = "abcdefg";
   ArrayView<char> x(arr);
   const ArrayView<char> y(arr);
   ArrayView<const char, 8> z(arr);
   EXPECT_EQ(8u, x.size());
   EXPECT_EQ(8u, y.size());
   EXPECT_EQ(8u, z.size());
   EXPECT_EQ('b', x[1]);
   EXPECT_EQ('c', y[2]);
   EXPECT_EQ('d', z[3]);
   x[3] = 'X';
   y[2] = 'Y';
   // z[1] = 'Z';  // Compile error, because z's element type is const char.
   EXPECT_EQ('b', x[1]);
   EXPECT_EQ('Y', y[2]);
   EXPECT_EQ('X', z[3]);
 #if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
   EXPECT_DEATH(z[8], "");  // DCHECK error (index out of bounds).
 #endif
 }

 TEST(ArrayViewTest, TestIterationEmpty) {
   // Variable-size.
   ArrayView<std::vector<std::vector<std::vector<std::string>>>> av;
   EXPECT_EQ(av.begin(), av.end());
   EXPECT_EQ(av.cbegin(), av.cend());
   for (auto& e : av) {
     EXPECT_TRUE(false);
     EXPECT_EQ(42u, e.size());  // Dummy use of e to prevent unused var warning.
   }

   // Fixed-size.
   ArrayView<std::vector<std::vector<std::vector<std::string>>>, 0> af;
   EXPECT_EQ(af.begin(), af.end());
   EXPECT_EQ(af.cbegin(), af.cend());
   for (auto& e : af) {
     EXPECT_TRUE(false);
     EXPECT_EQ(42u, e.size());  // Dummy use of e to prevent unused var warning.
   }
 }

 TEST(ArrayViewTest, TestIterationVariable) {
   char arr[] = "Arrr!";
   ArrayView<char> av(arr);
   EXPECT_EQ('A', *av.begin());
   EXPECT_EQ('A', *av.cbegin());
   EXPECT_EQ('\0', *(av.end() - 1));
   EXPECT_EQ('\0', *(av.cend() - 1));
   char i = 0;
   for (auto& e : av) {
     EXPECT_EQ(arr + i, &e);
     e = 's' + i;
     ++i;
   }
   i = 0;
   for (auto& e : ArrayView<const char>(av)) {
     EXPECT_EQ(arr + i, &e);
     // e = 'q' + i;  // Compile error, because e is a const char&.
     ++i;
   }
 }

 TEST(ArrayViewTest, TestIterationFixed) {
   char arr[] = "Arrr!";
   ArrayView<char, 6> av(arr);
   EXPECT_EQ('A', *av.begin());
   EXPECT_EQ('A', *av.cbegin());
   EXPECT_EQ('\0', *(av.end() - 1));
   EXPECT_EQ('\0', *(av.cend() - 1));
   char i = 0;
   for (auto& e : av) {
     EXPECT_EQ(arr + i, &e);
     e = 's' + i;
     ++i;
   }
   i = 0;
   for (auto& e : ArrayView<const char, 6>(av)) {
     EXPECT_EQ(arr + i, &e);
     // e = 'q' + i;  // Compile error, because e is a const char&.
     ++i;
   }
 }

 TEST(ArrayViewTest, TestEmpty) {
   EXPECT_TRUE(ArrayView<int>().empty());
   const int a[] = {1, 2, 3};
   EXPECT_FALSE(ArrayView<const int>(a).empty());

   static_assert(ArrayView<int, 0>::empty(), "");
   static_assert(!ArrayView<int, 3>::empty(), "");
 }

 TEST(ArrayViewTest, TestCompare) {
   int a[] = {1, 2, 3};
   int b[] = {1, 2, 3};

   EXPECT_EQ(ArrayView<int>(a), ArrayView<int>(a));
   EXPECT_EQ((ArrayView<int, 3>(a)), (ArrayView<int, 3>(a)));
   EXPECT_EQ(ArrayView<int>(a), (ArrayView<int, 3>(a)));
   EXPECT_EQ(ArrayView<int>(), ArrayView<int>());
   EXPECT_EQ(ArrayView<int>(), ArrayView<int>(a, 0));
   EXPECT_EQ(ArrayView<int>(a, 0), ArrayView<int>(b, 0));
   EXPECT_EQ((ArrayView<int, 0>(a, 0)), ArrayView<int>());

   EXPECT_NE(ArrayView<int>(a), ArrayView<int>(b));
   EXPECT_NE((ArrayView<int, 3>(a)), (ArrayView<int, 3>(b)));
   EXPECT_NE((ArrayView<int, 3>(a)), ArrayView<int>(b));
   EXPECT_NE(ArrayView<int>(a), ArrayView<int>());
   EXPECT_NE(ArrayView<int>(a), ArrayView<int>(a, 2));
   EXPECT_NE((ArrayView<int, 3>(a)), (ArrayView<int, 2>(a, 2)));
 }

 TEST(ArrayViewTest, TestSubViewVariable) {
   int a[] = {1, 2, 3};
   ArrayView<int> av(a);

   EXPECT_EQ(av.subview(0), av);

   EXPECT_THAT(av.subview(1), ElementsAre(2, 3));
   EXPECT_THAT(av.subview(2), ElementsAre(3));
   EXPECT_THAT(av.subview(3), IsEmpty());
   EXPECT_THAT(av.subview(4), IsEmpty());

   EXPECT_THAT(av.subview(1, 0), IsEmpty());
   EXPECT_THAT(av.subview(1, 1), ElementsAre(2));
   EXPECT_THAT(av.subview(1, 2), ElementsAre(2, 3));
   EXPECT_THAT(av.subview(1, 3), ElementsAre(2, 3));
 }

 TEST(ArrayViewTest, TestSubViewFixed) {
   int a[] = {1, 2, 3};
   ArrayView<int, 3> av(a);

   EXPECT_EQ(av.subview(0), av);

   EXPECT_THAT(av.subview(1), ElementsAre(2, 3));
   EXPECT_THAT(av.subview(2), ElementsAre(3));
   EXPECT_THAT(av.subview(3), IsEmpty());
   EXPECT_THAT(av.subview(4), IsEmpty());

   EXPECT_THAT(av.subview(1, 0), IsEmpty());
   EXPECT_THAT(av.subview(1, 1), ElementsAre(2));
   EXPECT_THAT(av.subview(1, 2), ElementsAre(2, 3));
   EXPECT_THAT(av.subview(1, 3), ElementsAre(2, 3));
 }

 }  // namespace rtc
	/*
	* Copyright 2015 The WebRTC Project Authors. All rights reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include <algorithm>
	#include <string>
	#include <utility>
	#include <vector>

	#include "api/array_view.h"
	#include "rtc_base/buffer.h"
	#include "rtc_base/checks.h"
	#include "rtc_base/gunit.h"
	#include "test/gmock.h"

	namespace rtc {

	namespace {

	using ::testing::ElementsAre;
	using ::testing::IsEmpty;

	template <typename T>
	void Call(ArrayView<T>) {}

	} // namespace

	TEST(ArrayViewTest, TestConstructFromPtrAndArray) {
	char arr[] = "Arrr!";
	const char carr[] = "Carrr!";
	Call<const char>(arr);
	Call<const char>(carr);
	Call<char>(arr);
	// Call<char>(carr); // Compile error, because can't drop const.
	// Call<int>(arr); // Compile error, because incompatible types.
	ArrayView<int*> x;
	EXPECT_EQ(0u, x.size());
	EXPECT_EQ(nullptr, x.data());
	ArrayView<char> y = arr;
	EXPECT_EQ(6u, y.size());
	EXPECT_EQ(arr, y.data());
	ArrayView<char, 6> yf = arr;
	static_assert(yf.size() == 6, "");
	EXPECT_EQ(arr, yf.data());
	ArrayView<const char> z(arr + 1, 3);
	EXPECT_EQ(3u, z.size());
	EXPECT_EQ(arr + 1, z.data());
	ArrayView<const char, 3> zf(arr + 1, 3);
	static_assert(zf.size() == 3, "");
	EXPECT_EQ(arr + 1, zf.data());
	ArrayView<const char> w(arr, 2);
	EXPECT_EQ(2u, w.size());
	EXPECT_EQ(arr, w.data());
	ArrayView<const char, 2> wf(arr, 2);
	static_assert(wf.size() == 2, "");
	EXPECT_EQ(arr, wf.data());
	ArrayView<char> q(arr, 0);
	EXPECT_EQ(0u, q.size());
	EXPECT_EQ(nullptr, q.data());
	ArrayView<char, 0> qf(arr, 0);
	static_assert(qf.size() == 0, "");
	EXPECT_EQ(nullptr, qf.data());
	#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
	// DCHECK error (nullptr with nonzero size).
	EXPECT_DEATH(ArrayView<int>(static_cast<int*>(nullptr), 5), "");
	#endif
	// These are compile errors, because incompatible types.
	// ArrayView<int> m = arr;
	// ArrayView<float> n(arr + 2, 2);
	}

	TEST(ArrayViewTest, TestCopyConstructorVariable) {
	char arr[] = "Arrr!";
	ArrayView<char> x = arr;
	EXPECT_EQ(6u, x.size());
	EXPECT_EQ(arr, x.data());
	ArrayView<char> y = x; // Copy non-const -> non-const.
	EXPECT_EQ(6u, y.size());
	EXPECT_EQ(arr, y.data());
	ArrayView<const char> z = x; // Copy non-const -> const.
	EXPECT_EQ(6u, z.size());
	EXPECT_EQ(arr, z.data());
	ArrayView<const char> w = z; // Copy const -> const.
	EXPECT_EQ(6u, w.size());
	EXPECT_EQ(arr, w.data());
	// ArrayView<char> v = z; // Compile error, because can't drop const.
	}

	TEST(ArrayViewTest, TestCopyConstructorFixed) {
	char arr[] = "Arrr!";
	ArrayView<char, 6> x = arr;
	static_assert(x.size() == 6, "");
	EXPECT_EQ(arr, x.data());

	// Copy fixed -> fixed.
	ArrayView<char, 6> y = x; // Copy non-const -> non-const.
	static_assert(y.size() == 6, "");
	EXPECT_EQ(arr, y.data());
	ArrayView<const char, 6> z = x; // Copy non-const -> const.
	static_assert(z.size() == 6, "");
	EXPECT_EQ(arr, z.data());
	ArrayView<const char, 6> w = z; // Copy const -> const.
	static_assert(w.size() == 6, "");
	EXPECT_EQ(arr, w.data());
	// ArrayView<char, 6> v = z; // Compile error, because can't drop const.

	// Copy fixed -> variable.
	ArrayView<char> yv = x; // Copy non-const -> non-const.
	EXPECT_EQ(6u, yv.size());
	EXPECT_EQ(arr, yv.data());
	ArrayView<const char> zv = x; // Copy non-const -> const.
	EXPECT_EQ(6u, zv.size());
	EXPECT_EQ(arr, zv.data());
	ArrayView<const char> wv = z; // Copy const -> const.
	EXPECT_EQ(6u, wv.size());
	EXPECT_EQ(arr, wv.data());
	// ArrayView<char> vv = z; // Compile error, because can't drop const.
	}

	TEST(ArrayViewTest, TestCopyAssignmentVariable) {
	char arr[] = "Arrr!";
	ArrayView<char> x(arr);
	EXPECT_EQ(6u, x.size());
	EXPECT_EQ(arr, x.data());
	ArrayView<char> y;
	y = x; // Copy non-const -> non-const.
	EXPECT_EQ(6u, y.size());
	EXPECT_EQ(arr, y.data());
	ArrayView<const char> z;
	z = x; // Copy non-const -> const.
	EXPECT_EQ(6u, z.size());
	EXPECT_EQ(arr, z.data());
	ArrayView<const char> w;
	w = z; // Copy const -> const.
	EXPECT_EQ(6u, w.size());
	EXPECT_EQ(arr, w.data());
	// ArrayView<char> v;
	// v = z; // Compile error, because can't drop const.
	}

	TEST(ArrayViewTest, TestCopyAssignmentFixed) {
	char arr[] = "Arrr!";
	char init[] = "Init!";
	ArrayView<char, 6> x(arr);
	EXPECT_EQ(arr, x.data());

	// Copy fixed -> fixed.
	ArrayView<char, 6> y(init);
	y = x; // Copy non-const -> non-const.
	EXPECT_EQ(arr, y.data());
	ArrayView<const char, 6> z(init);
	z = x; // Copy non-const -> const.
	EXPECT_EQ(arr, z.data());
	ArrayView<const char, 6> w(init);
	w = z; // Copy const -> const.
	EXPECT_EQ(arr, w.data());
	// ArrayView<char, 6> v(init);
	// v = z; // Compile error, because can't drop const.

	// Copy fixed -> variable.
	ArrayView<char> yv;
	yv = x; // Copy non-const -> non-const.
	EXPECT_EQ(6u, yv.size());
	EXPECT_EQ(arr, yv.data());
	ArrayView<const char> zv;
	zv = x; // Copy non-const -> const.
	EXPECT_EQ(6u, zv.size());
	EXPECT_EQ(arr, zv.data());
	ArrayView<const char> wv;
	wv = z; // Copy const -> const.
	EXPECT_EQ(6u, wv.size());
	EXPECT_EQ(arr, wv.data());
	// ArrayView<char> v;
	// v = z; // Compile error, because can't drop const.
	}

	TEST(ArrayViewTest, TestStdVector) {
	std::vector<int> v;
	v.push_back(3);
	v.push_back(11);
	Call<const int>(v);
	Call<int>(v);
	// Call<unsigned int>(v); // Compile error, because incompatible types.
	ArrayView<int> x = v;
	EXPECT_EQ(2u, x.size());
	EXPECT_EQ(v.data(), x.data());
	ArrayView<const int> y;
	y = v;
	EXPECT_EQ(2u, y.size());
	EXPECT_EQ(v.data(), y.data());
	// ArrayView<double> d = v; // Compile error, because incompatible types.
	const std::vector<int> cv;
	Call<const int>(cv);
	// Call<int>(cv); // Compile error, because can't drop const.
	ArrayView<const int> z = cv;
	EXPECT_EQ(0u, z.size());
	EXPECT_EQ(nullptr, z.data());
	// ArrayView<int> w = cv; // Compile error, because can't drop const.
	}

	TEST(ArrayViewTest, TestRtcBuffer) {
	rtc::Buffer b = "so buffer";
	Call<const uint8_t>(b);
	Call<uint8_t>(b);
	// Call<int8_t>(b); // Compile error, because incompatible types.
	ArrayView<uint8_t> x = b;
	EXPECT_EQ(10u, x.size());
	EXPECT_EQ(b.data(), x.data());
	ArrayView<const uint8_t> y;
	y = b;
	EXPECT_EQ(10u, y.size());
	EXPECT_EQ(b.data(), y.data());
	// ArrayView<char> d = b; // Compile error, because incompatible types.
	const rtc::Buffer cb = "very const";
	Call<const uint8_t>(cb);
	// Call<uint8_t>(cb); // Compile error, because can't drop const.
	ArrayView<const uint8_t> z = cb;
	EXPECT_EQ(11u, z.size());
	EXPECT_EQ(cb.data(), z.data());
	// ArrayView<uint8_t> w = cb; // Compile error, because can't drop const.
	}

	TEST(ArrayViewTest, TestSwapVariable) {
	const char arr[] = "Arrr!";
	const char aye[] = "Aye, Cap'n!";
	ArrayView<const char> x(arr);
	EXPECT_EQ(6u, x.size());
	EXPECT_EQ(arr, x.data());
	ArrayView<const char> y(aye);
	EXPECT_EQ(12u, y.size());
	EXPECT_EQ(aye, y.data());
	using std::swap;
	swap(x, y);
	EXPECT_EQ(12u, x.size());
	EXPECT_EQ(aye, x.data());
	EXPECT_EQ(6u, y.size());
	EXPECT_EQ(arr, y.data());
	// ArrayView<char> z;
	// swap(x, z); // Compile error, because can't drop const.
	}

	TEST(FixArrayViewTest, TestSwapFixed) {
	const char arr[] = "Arr!";
	char aye[] = "Aye!";
	ArrayView<const char, 5> x(arr);
	EXPECT_EQ(arr, x.data());
	ArrayView<const char, 5> y(aye);
	EXPECT_EQ(aye, y.data());
	using std::swap;
	swap(x, y);
	EXPECT_EQ(aye, x.data());
	EXPECT_EQ(arr, y.data());
	// ArrayView<char, 5> z(aye);
	// swap(x, z); // Compile error, because can't drop const.
	// ArrayView<const char, 4> w(aye, 4);
	// swap(x, w); // Compile error, because different sizes.
	}

	TEST(ArrayViewTest, TestIndexing) {
	char arr[] = "abcdefg";
	ArrayView<char> x(arr);
	const ArrayView<char> y(arr);
	ArrayView<const char, 8> z(arr);
	EXPECT_EQ(8u, x.size());
	EXPECT_EQ(8u, y.size());
	EXPECT_EQ(8u, z.size());
	EXPECT_EQ('b', x[1]);
	EXPECT_EQ('c', y[2]);
	EXPECT_EQ('d', z[3]);
	x[3] = 'X';
	y[2] = 'Y';
	// z[1] = 'Z'; // Compile error, because z's element type is const char.
	EXPECT_EQ('b', x[1]);
	EXPECT_EQ('Y', y[2]);
	EXPECT_EQ('X', z[3]);
	#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
	EXPECT_DEATH(z[8], ""); // DCHECK error (index out of bounds).
	#endif
	}

	TEST(ArrayViewTest, TestIterationEmpty) {
	// Variable-size.
	ArrayView<std::vector<std::vector<std::vector<std::string>>>> av;
	EXPECT_EQ(av.begin(), av.end());
	EXPECT_EQ(av.cbegin(), av.cend());
	for (auto& e : av) {
	EXPECT_TRUE(false);
	EXPECT_EQ(42u, e.size()); // Dummy use of e to prevent unused var warning.
	}

	// Fixed-size.
	ArrayView<std::vector<std::vector<std::vector<std::string>>>, 0> af;
	EXPECT_EQ(af.begin(), af.end());
	EXPECT_EQ(af.cbegin(), af.cend());
	for (auto& e : af) {
	EXPECT_TRUE(false);
	EXPECT_EQ(42u, e.size()); // Dummy use of e to prevent unused var warning.
	}
	}

	TEST(ArrayViewTest, TestIterationVariable) {
	char arr[] = "Arrr!";
	ArrayView<char> av(arr);
	EXPECT_EQ('A', *av.begin());
	EXPECT_EQ('A', *av.cbegin());
	EXPECT_EQ('\0', *(av.end() - 1));
	EXPECT_EQ('\0', *(av.cend() - 1));
	char i = 0;
	for (auto& e : av) {
	EXPECT_EQ(arr + i, &e);
	e = 's' + i;
	++i;
	}
	i = 0;
	for (auto& e : ArrayView<const char>(av)) {
	EXPECT_EQ(arr + i, &e);
	// e = 'q' + i; // Compile error, because e is a const char&.
	++i;
	}
	}

	TEST(ArrayViewTest, TestIterationFixed) {
	char arr[] = "Arrr!";
	ArrayView<char, 6> av(arr);
	EXPECT_EQ('A', *av.begin());
	EXPECT_EQ('A', *av.cbegin());
	EXPECT_EQ('\0', *(av.end() - 1));
	EXPECT_EQ('\0', *(av.cend() - 1));
	char i = 0;
	for (auto& e : av) {
	EXPECT_EQ(arr + i, &e);
	e = 's' + i;
	++i;
	}
	i = 0;
	for (auto& e : ArrayView<const char, 6>(av)) {
	EXPECT_EQ(arr + i, &e);
	// e = 'q' + i; // Compile error, because e is a const char&.
	++i;
	}
	}

	TEST(ArrayViewTest, TestEmpty) {
	EXPECT_TRUE(ArrayView<int>().empty());
	const int a[] = {1, 2, 3};
	EXPECT_FALSE(ArrayView<const int>(a).empty());

	static_assert(ArrayView<int, 0>::empty(), "");
	static_assert(!ArrayView<int, 3>::empty(), "");
	}

	TEST(ArrayViewTest, TestCompare) {
	int a[] = {1, 2, 3};
	int b[] = {1, 2, 3};

	EXPECT_EQ(ArrayView<int>(a), ArrayView<int>(a));
	EXPECT_EQ((ArrayView<int, 3>(a)), (ArrayView<int, 3>(a)));
	EXPECT_EQ(ArrayView<int>(a), (ArrayView<int, 3>(a)));
	EXPECT_EQ(ArrayView<int>(), ArrayView<int>());
	EXPECT_EQ(ArrayView<int>(), ArrayView<int>(a, 0));
	EXPECT_EQ(ArrayView<int>(a, 0), ArrayView<int>(b, 0));
	EXPECT_EQ((ArrayView<int, 0>(a, 0)), ArrayView<int>());

	EXPECT_NE(ArrayView<int>(a), ArrayView<int>(b));
	EXPECT_NE((ArrayView<int, 3>(a)), (ArrayView<int, 3>(b)));
	EXPECT_NE((ArrayView<int, 3>(a)), ArrayView<int>(b));
	EXPECT_NE(ArrayView<int>(a), ArrayView<int>());
	EXPECT_NE(ArrayView<int>(a), ArrayView<int>(a, 2));
	EXPECT_NE((ArrayView<int, 3>(a)), (ArrayView<int, 2>(a, 2)));
	}

	TEST(ArrayViewTest, TestSubViewVariable) {
	int a[] = {1, 2, 3};
	ArrayView<int> av(a);

	EXPECT_EQ(av.subview(0), av);

	EXPECT_THAT(av.subview(1), ElementsAre(2, 3));
	EXPECT_THAT(av.subview(2), ElementsAre(3));
	EXPECT_THAT(av.subview(3), IsEmpty());
	EXPECT_THAT(av.subview(4), IsEmpty());

	EXPECT_THAT(av.subview(1, 0), IsEmpty());
	EXPECT_THAT(av.subview(1, 1), ElementsAre(2));
	EXPECT_THAT(av.subview(1, 2), ElementsAre(2, 3));
	EXPECT_THAT(av.subview(1, 3), ElementsAre(2, 3));
	}

	TEST(ArrayViewTest, TestSubViewFixed) {
	int a[] = {1, 2, 3};
	ArrayView<int, 3> av(a);

	EXPECT_EQ(av.subview(0), av);

	EXPECT_THAT(av.subview(1), ElementsAre(2, 3));
	EXPECT_THAT(av.subview(2), ElementsAre(3));
	EXPECT_THAT(av.subview(3), IsEmpty());
	EXPECT_THAT(av.subview(4), IsEmpty());

	EXPECT_THAT(av.subview(1, 0), IsEmpty());
	EXPECT_THAT(av.subview(1, 1), ElementsAre(2));
	EXPECT_THAT(av.subview(1, 2), ElementsAre(2, 3));
	EXPECT_THAT(av.subview(1, 3), ElementsAre(2, 3));
	}

	} // namespace rtc