From 5a8de8a37e3e282d22f69ca67b4aba8e4cca63ae Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Wed, 17 Jan 2018 09:53:47 -0800 Subject: Changes imported from Abseil "staging" branch: - 5e874e644191fbf99f5636d6303de2b28b23392c Adds a absl::apply function, similar to c++17's std::apply. by Abseil Team - 16373c438d16a09725dace03ab7ba0f7c2337279 Add debugging_internal::StackTraceWorksForTest by Abseil Team - a623257aaaff8a5fba3377f34f92f319a104e444 Update absl::CondVar documentation in response to GitHub ... by Derek Mauro - 87d58a25bc4ecd46165dd1c417121c86cbc07be0 Add assert against uint128 negative bit shift undefined b... by Alex Strelnikov - af155c0d2a3556b56a9bcd6f9ee7416277185df8 Fix comment typos. by Abseil Team - 1824ae832eb75d447dea730b5968d952897e135a Rollback of: Add debugging_internal::StackTraceWorksForTest by Abseil Team - 97318f087ce63dd5acf1e0d3d697cd90a7d6ebfd Add debugging_internal::StackTraceWorksForTest by Abseil Team - 9dd1d17dca17f0ded3bda336b7521fd57d08a5cc Move log_severity.h out of internal. by Abseil Team - 2212bb56b1a8365d2303ff0983441298d08444e5 Internal change. by Alex Strelnikov GitOrigin-RevId: 5e874e644191fbf99f5636d6303de2b28b23392c Change-Id: Ic270393ac1f15866afb64617d28269cd829030f6 --- absl/utility/utility_test.cc | 178 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 176 insertions(+), 2 deletions(-) (limited to 'absl/utility/utility_test.cc') diff --git a/absl/utility/utility_test.cc b/absl/utility/utility_test.cc index 62cb46f4..342165ed 100644 --- a/absl/utility/utility_test.cc +++ b/absl/utility/utility_test.cc @@ -23,6 +23,8 @@ #include "gmock/gmock.h" #include "gtest/gtest.h" #include "absl/base/attributes.h" +#include "absl/memory/memory.h" +#include "absl/strings/str_cat.h" namespace { @@ -38,8 +40,9 @@ namespace { #pragma warning( disable : 4101 ) // unreferenced local variable #endif // _MSC_VER -using testing::StaticAssertTypeEq; -using testing::ElementsAre; +using ::testing::ElementsAre; +using ::testing::Pointee; +using ::testing::StaticAssertTypeEq; TEST(IntegerSequenceTest, ValueType) { StaticAssertTypeEq::value_type>(); @@ -159,5 +162,176 @@ TEST(IndexSequenceForTest, Example) { ElementsAre("12", "abc", "3.14")); } +int Function(int a, int b) { return a - b; } + +int Sink(std::unique_ptr p) { return *p; } + +std::unique_ptr Factory(int n) { return absl::make_unique(n); } + +void NoOp() {} + +struct ConstFunctor { + int operator()(int a, int b) const { return a - b; } +}; + +struct MutableFunctor { + int operator()(int a, int b) { return a - b; } +}; + +struct EphemeralFunctor { + EphemeralFunctor() {} + EphemeralFunctor(const EphemeralFunctor&) {} + EphemeralFunctor(EphemeralFunctor&&) {} + int operator()(int a, int b) && { return a - b; } +}; + +struct OverloadedFunctor { + OverloadedFunctor() {} + OverloadedFunctor(const OverloadedFunctor&) {} + OverloadedFunctor(OverloadedFunctor&&) {} + template + std::string operator()(const Args&... args) & { + return absl::StrCat("&", args...); + } + template + std::string operator()(const Args&... args) const& { + return absl::StrCat("const&", args...); + } + template + std::string operator()(const Args&... args) && { + return absl::StrCat("&&", args...); + } +}; + +struct Class { + int Method(int a, int b) { return a - b; } + int ConstMethod(int a, int b) const { return a - b; } + + int member; +}; + +struct FlipFlop { + int ConstMethod() const { return member; } + FlipFlop operator*() const { return {-member}; } + + int member; +}; + +TEST(ApplyTest, Function) { + EXPECT_EQ(1, absl::apply(Function, std::make_tuple(3, 2))); + EXPECT_EQ(1, absl::apply(&Function, std::make_tuple(3, 2))); +} + +TEST(ApplyTest, NonCopyableArgument) { + EXPECT_EQ(42, absl::apply(Sink, std::make_tuple(absl::make_unique(42)))); +} + +TEST(ApplyTest, NonCopyableResult) { + EXPECT_THAT(absl::apply(Factory, std::make_tuple(42)), + ::testing::Pointee(42)); +} + +TEST(ApplyTest, VoidResult) { absl::apply(NoOp, std::tuple<>()); } + +TEST(ApplyTest, ConstFunctor) { + EXPECT_EQ(1, absl::apply(ConstFunctor(), std::make_tuple(3, 2))); +} + +TEST(ApplyTest, MutableFunctor) { + MutableFunctor f; + EXPECT_EQ(1, absl::apply(f, std::make_tuple(3, 2))); + EXPECT_EQ(1, absl::apply(MutableFunctor(), std::make_tuple(3, 2))); +} +TEST(ApplyTest, EphemeralFunctor) { + EphemeralFunctor f; + EXPECT_EQ(1, absl::apply(std::move(f), std::make_tuple(3, 2))); + EXPECT_EQ(1, absl::apply(EphemeralFunctor(), std::make_tuple(3, 2))); +} +TEST(ApplyTest, OverloadedFunctor) { + OverloadedFunctor f; + const OverloadedFunctor& cf = f; + + EXPECT_EQ("&", absl::apply(f, std::tuple<>{})); + EXPECT_EQ("& 42", absl::apply(f, std::make_tuple(" 42"))); + + EXPECT_EQ("const&", absl::apply(cf, std::tuple<>{})); + EXPECT_EQ("const& 42", absl::apply(cf, std::make_tuple(" 42"))); + + EXPECT_EQ("&&", absl::apply(std::move(f), std::tuple<>{})); + OverloadedFunctor f2; + EXPECT_EQ("&& 42", absl::apply(std::move(f2), std::make_tuple(" 42"))); +} + +TEST(ApplyTest, ReferenceWrapper) { + ConstFunctor cf; + MutableFunctor mf; + EXPECT_EQ(1, absl::apply(std::cref(cf), std::make_tuple(3, 2))); + EXPECT_EQ(1, absl::apply(std::ref(cf), std::make_tuple(3, 2))); + EXPECT_EQ(1, absl::apply(std::ref(mf), std::make_tuple(3, 2))); +} + +TEST(ApplyTest, MemberFunction) { + std::unique_ptr p(new Class); + std::unique_ptr cp(new Class); + EXPECT_EQ( + 1, absl::apply(&Class::Method, + std::tuple&, int, int>(p, 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::Method, + std::tuple(p.get(), 3, 2))); + EXPECT_EQ( + 1, absl::apply(&Class::Method, std::tuple(*p, 3, 2))); + + EXPECT_EQ( + 1, absl::apply(&Class::ConstMethod, + std::tuple&, int, int>(p, 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple(p.get(), 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple(*p, 3, 2))); + + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple&, int, int>( + cp, 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple(cp.get(), 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple(*cp, 3, 2))); + + EXPECT_EQ(1, absl::apply(&Class::Method, + std::make_tuple(absl::make_unique(), 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::make_tuple(absl::make_unique(), 3, 2))); + EXPECT_EQ( + 1, absl::apply(&Class::ConstMethod, + std::make_tuple(absl::make_unique(), 3, 2))); +} + +TEST(ApplyTest, DataMember) { + std::unique_ptr p(new Class{42}); + std::unique_ptr cp(new Class{42}); + EXPECT_EQ( + 42, absl::apply(&Class::member, std::tuple&>(p))); + EXPECT_EQ(42, absl::apply(&Class::member, std::tuple(*p))); + EXPECT_EQ(42, absl::apply(&Class::member, std::tuple(p.get()))); + + absl::apply(&Class::member, std::tuple&>(p)) = 42; + absl::apply(&Class::member, std::tuple(p.get())) = 42; + absl::apply(&Class::member, std::tuple(*p)) = 42; + + EXPECT_EQ(42, absl::apply(&Class::member, + std::tuple&>(cp))); + EXPECT_EQ(42, absl::apply(&Class::member, std::tuple(*cp))); + EXPECT_EQ(42, + absl::apply(&Class::member, std::tuple(cp.get()))); +} + +TEST(ApplyTest, FlipFlop) { + FlipFlop obj = {42}; + // This call could resolve to (obj.*&FlipFlop::ConstMethod)() or + // ((*obj).*&FlipFlop::ConstMethod)(). We verify that it's the former. + EXPECT_EQ(42, absl::apply(&FlipFlop::ConstMethod, std::make_tuple(obj))); + EXPECT_EQ(42, absl::apply(&FlipFlop::member, std::make_tuple(obj))); +} + } // namespace -- cgit v1.2.3