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- // Copyright 2021 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/cxx17_backports.h"
- #include <array>
- #include <memory>
- #include <tuple>
- #include <type_traits>
- #include <utility>
- #include <vector>
- #include "base/test/gtest_util.h"
- #include "testing/gmock/include/gmock/gmock.h"
- #include "testing/gtest/include/gtest/gtest.h"
- namespace base {
- namespace {
- struct OneType {
- int some_int;
- };
- bool operator<(const OneType& lhs, const OneType& rhs) {
- return lhs.some_int < rhs.some_int;
- }
- bool operator==(const OneType& lhs, const OneType& rhs) {
- return lhs.some_int == rhs.some_int;
- }
- struct AnotherType {
- int some_other_int;
- };
- bool operator==(const AnotherType& lhs, const AnotherType& rhs) {
- return lhs.some_other_int == rhs.some_other_int;
- }
- TEST(Cxx17BackportTest, Clamp) {
- EXPECT_EQ(0, base::clamp(-5, 0, 10));
- EXPECT_EQ(0, base::clamp(0, 0, 10));
- EXPECT_EQ(3, base::clamp(3, 0, 10));
- EXPECT_EQ(10, base::clamp(10, 0, 10));
- EXPECT_EQ(10, base::clamp(15, 0, 10));
- EXPECT_EQ(0.0, base::clamp(-5.0, 0.0, 10.0));
- EXPECT_EQ(0.0, base::clamp(0.0, 0.0, 10.0));
- EXPECT_EQ(3.0, base::clamp(3.0, 0.0, 10.0));
- EXPECT_EQ(10.0, base::clamp(10.0, 0.0, 10.0));
- EXPECT_EQ(10.0, base::clamp(15.0, 0.0, 10.0));
- EXPECT_EQ(0, base::clamp(-5, 0, 0));
- EXPECT_EQ(0, base::clamp(0, 0, 0));
- EXPECT_EQ(0, base::clamp(3, 0, 0));
- OneType one_type_neg5{-5};
- OneType one_type_0{0};
- OneType one_type_3{3};
- OneType one_type_10{10};
- OneType one_type_15{15};
- EXPECT_EQ(one_type_0, base::clamp(one_type_neg5, one_type_0, one_type_10));
- EXPECT_EQ(one_type_0, base::clamp(one_type_0, one_type_0, one_type_10));
- EXPECT_EQ(one_type_3, base::clamp(one_type_3, one_type_0, one_type_10));
- EXPECT_EQ(one_type_10, base::clamp(one_type_10, one_type_0, one_type_10));
- EXPECT_EQ(one_type_10, base::clamp(one_type_15, one_type_0, one_type_10));
- AnotherType another_type_neg5{-5};
- AnotherType another_type_0{0};
- AnotherType another_type_3{3};
- AnotherType another_type_10{10};
- AnotherType another_type_15{15};
- auto compare_another_type = [](const auto& lhs, const auto& rhs) {
- return lhs.some_other_int < rhs.some_other_int;
- };
- EXPECT_EQ(another_type_0, base::clamp(another_type_neg5, another_type_0,
- another_type_10, compare_another_type));
- EXPECT_EQ(another_type_0, base::clamp(another_type_0, another_type_0,
- another_type_10, compare_another_type));
- EXPECT_EQ(another_type_3, base::clamp(another_type_3, another_type_0,
- another_type_10, compare_another_type));
- EXPECT_EQ(another_type_10,
- base::clamp(another_type_10, another_type_0, another_type_10,
- compare_another_type));
- EXPECT_EQ(another_type_10,
- base::clamp(another_type_15, another_type_0, another_type_10,
- compare_another_type));
- EXPECT_CHECK_DEATH(base::clamp(3, 10, 0));
- EXPECT_CHECK_DEATH(base::clamp(3.0, 10.0, 0.0));
- EXPECT_CHECK_DEATH(base::clamp(one_type_3, one_type_10, one_type_0));
- EXPECT_CHECK_DEATH(base::clamp(another_type_3, another_type_10,
- another_type_0, compare_another_type));
- }
- constexpr int Subtract(int a, int b) {
- return a - b;
- }
- int SubtractUnique(std::unique_ptr<int> a, std::unique_ptr<int> b) {
- return *a - *b;
- }
- TEST(Cxx17BackportTest, Apply) {
- // Function
- constexpr std::tuple<int, int> tuple1(3, 2);
- static_assert(base::apply(&Subtract, tuple1) == 1,
- "base::apply() can invoke functions as constexpr");
- // Function with move-only types
- std::tuple<std::unique_ptr<int>, std::unique_ptr<int>> tuple2(
- std::make_unique<int>(3), std::make_unique<int>(2));
- EXPECT_EQ(1, base::apply(&SubtractUnique, std::move(tuple2)));
- // Lambda
- const auto subtract_lambda = [](int a, int b) { return a - b; };
- EXPECT_EQ(1, base::apply(subtract_lambda, tuple1));
- // Member function
- class Foo {
- public:
- constexpr Foo(int a) : a_(a) {}
- constexpr int Bar(int b) const { return a_ - b; }
- private:
- int a_;
- };
- static constexpr Foo f(3);
- constexpr std::tuple<const Foo*, int> tuple3(&f, 2);
- static_assert(base::apply(&Foo::Bar, tuple3) == 1,
- "base::apply() can invoke member functions as constexpr");
- }
- } // namespace
- } // namespace base
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