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authorAbseil Team <absl-team@google.com>2018-12-04 11:01:12 -0800
committerAshley Hedberg <ahedberg@google.com>2018-12-04 16:54:40 -0500
commitfcb104594b0bb4b8ac306cb2f55ecdad40974683 (patch)
treed2d79d246c6a894ca6716f47c15ebb7b8796b36a /absl/container/internal/compressed_tuple_test.cc
parent6c7de165d1c82684359ccb630bb5f83263fa5ebc (diff)
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Diffstat (limited to 'absl/container/internal/compressed_tuple_test.cc')
-rw-r--r--absl/container/internal/compressed_tuple_test.cc168
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diff --git a/absl/container/internal/compressed_tuple_test.cc b/absl/container/internal/compressed_tuple_test.cc
new file mode 100644
index 00000000..2b5ed4a4
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+++ b/absl/container/internal/compressed_tuple_test.cc
@@ -0,0 +1,168 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/compressed_tuple.h"
+
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace absl {
+inline namespace lts_2018_12_18 {
+namespace container_internal {
+namespace {
+
+template <int>
+struct Empty {};
+
+template <typename T>
+struct NotEmpty {
+ T value;
+};
+
+template <typename T, typename U>
+struct TwoValues {
+ T value1;
+ U value2;
+};
+
+TEST(CompressedTupleTest, Sizeof) {
+ EXPECT_EQ(sizeof(int), sizeof(CompressedTuple<int>));
+ EXPECT_EQ(sizeof(int), sizeof(CompressedTuple<int, Empty<0>>));
+ EXPECT_EQ(sizeof(int), sizeof(CompressedTuple<int, Empty<0>, Empty<1>>));
+ EXPECT_EQ(sizeof(int),
+ sizeof(CompressedTuple<int, Empty<0>, Empty<1>, Empty<2>>));
+
+ EXPECT_EQ(sizeof(TwoValues<int, double>),
+ sizeof(CompressedTuple<int, NotEmpty<double>>));
+ EXPECT_EQ(sizeof(TwoValues<int, double>),
+ sizeof(CompressedTuple<int, Empty<0>, NotEmpty<double>>));
+ EXPECT_EQ(sizeof(TwoValues<int, double>),
+ sizeof(CompressedTuple<int, Empty<0>, NotEmpty<double>, Empty<1>>));
+}
+
+TEST(CompressedTupleTest, Access) {
+ struct S {
+ std::string x;
+ };
+ CompressedTuple<int, Empty<0>, S> x(7, {}, S{"ABC"});
+ EXPECT_EQ(sizeof(x), sizeof(TwoValues<int, S>));
+ EXPECT_EQ(7, x.get<0>());
+ EXPECT_EQ("ABC", x.get<2>().x);
+}
+
+TEST(CompressedTupleTest, NonClasses) {
+ CompressedTuple<int, const char*> x(7, "ABC");
+ EXPECT_EQ(7, x.get<0>());
+ EXPECT_STREQ("ABC", x.get<1>());
+}
+
+TEST(CompressedTupleTest, MixClassAndNonClass) {
+ CompressedTuple<int, const char*, Empty<0>, NotEmpty<double>> x(7, "ABC", {},
+ {1.25});
+ struct Mock {
+ int v;
+ const char* p;
+ double d;
+ };
+ EXPECT_EQ(sizeof(x), sizeof(Mock));
+ EXPECT_EQ(7, x.get<0>());
+ EXPECT_STREQ("ABC", x.get<1>());
+ EXPECT_EQ(1.25, x.get<3>().value);
+}
+
+TEST(CompressedTupleTest, Nested) {
+ CompressedTuple<int, CompressedTuple<int>,
+ CompressedTuple<int, CompressedTuple<int>>>
+ x(1, CompressedTuple<int>(2),
+ CompressedTuple<int, CompressedTuple<int>>(3, CompressedTuple<int>(4)));
+ EXPECT_EQ(1, x.get<0>());
+ EXPECT_EQ(2, x.get<1>().get<0>());
+ EXPECT_EQ(3, x.get<2>().get<0>());
+ EXPECT_EQ(4, x.get<2>().get<1>().get<0>());
+
+ CompressedTuple<Empty<0>, Empty<0>,
+ CompressedTuple<Empty<0>, CompressedTuple<Empty<0>>>>
+ y;
+ std::set<Empty<0>*> empties{&y.get<0>(), &y.get<1>(), &y.get<2>().get<0>(),
+ &y.get<2>().get<1>().get<0>()};
+#ifdef _MSC_VER
+ // MSVC has a bug where many instances of the same base class are layed out in
+ // the same address when using __declspec(empty_bases).
+ // This will be fixed in a future version of MSVC.
+ int expected = 1;
+#else
+ int expected = 4;
+#endif
+ EXPECT_EQ(expected, sizeof(y));
+ EXPECT_EQ(expected, empties.size());
+ EXPECT_EQ(sizeof(y), sizeof(Empty<0>) * empties.size());
+
+ EXPECT_EQ(4 * sizeof(char),
+ sizeof(CompressedTuple<CompressedTuple<char, char>,
+ CompressedTuple<char, char>>));
+ EXPECT_TRUE(
+ (std::is_empty<CompressedTuple<CompressedTuple<Empty<0>>,
+ CompressedTuple<Empty<1>>>>::value));
+}
+
+TEST(CompressedTupleTest, Reference) {
+ int i = 7;
+ std::string s = "Very long std::string that goes in the heap";
+ CompressedTuple<int, int&, std::string, std::string&> x(i, i, s, s);
+
+ // Sanity check. We should have not moved from `s`
+ EXPECT_EQ(s, "Very long std::string that goes in the heap");
+
+ EXPECT_EQ(x.get<0>(), x.get<1>());
+ EXPECT_NE(&x.get<0>(), &x.get<1>());
+ EXPECT_EQ(&x.get<1>(), &i);
+
+ EXPECT_EQ(x.get<2>(), x.get<3>());
+ EXPECT_NE(&x.get<2>(), &x.get<3>());
+ EXPECT_EQ(&x.get<3>(), &s);
+}
+
+TEST(CompressedTupleTest, NoElements) {
+ CompressedTuple<> x;
+ static_cast<void>(x); // Silence -Wunused-variable.
+ EXPECT_TRUE(std::is_empty<CompressedTuple<>>::value);
+}
+
+TEST(CompressedTupleTest, Constexpr) {
+ constexpr CompressedTuple<int, double, CompressedTuple<int>> x(
+ 7, 1.25, CompressedTuple<int>(5));
+ constexpr int x0 = x.get<0>();
+ constexpr double x1 = x.get<1>();
+ constexpr int x2 = x.get<2>().get<0>();
+ EXPECT_EQ(x0, 7);
+ EXPECT_EQ(x1, 1.25);
+ EXPECT_EQ(x2, 5);
+}
+
+#if defined(__clang__) || defined(__GNUC__)
+TEST(CompressedTupleTest, EmptyFinalClass) {
+ struct S final {
+ int f() const { return 5; }
+ };
+ CompressedTuple<S> x;
+ EXPECT_EQ(x.get<0>().f(), 5);
+}
+#endif
+
+} // namespace
+} // namespace container_internal
+} // inline namespace lts_2018_12_18
+} // namespace absl
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