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Diffstat (limited to 'third_party/abseil_cpp/absl/functional/function_ref_test.cc')
| -rw-r--r-- | third_party/abseil_cpp/absl/functional/function_ref_test.cc | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/third_party/abseil_cpp/absl/functional/function_ref_test.cc b/third_party/abseil_cpp/absl/functional/function_ref_test.cc new file mode 100644 index 0000000000..3aa5974587 --- /dev/null +++ b/third_party/abseil_cpp/absl/functional/function_ref_test.cc @@ -0,0 +1,257 @@ +// Copyright 2019 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 +// +// https://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/functional/function_ref.h" + +#include <memory> + +#include "gmock/gmock.h" +#include "gtest/gtest.h" +#include "absl/container/internal/test_instance_tracker.h" +#include "absl/memory/memory.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace { + +void RunFun(FunctionRef<void()> f) { f(); } + +TEST(FunctionRefTest, Lambda) { + bool ran = false; + RunFun([&] { ran = true; }); + EXPECT_TRUE(ran); +} + +int Function() { return 1337; } + +TEST(FunctionRefTest, Function1) { + FunctionRef<int()> ref(&Function); + EXPECT_EQ(1337, ref()); +} + +TEST(FunctionRefTest, Function2) { + FunctionRef<int()> ref(Function); + EXPECT_EQ(1337, ref()); +} + +int NoExceptFunction() noexcept { return 1337; } + +// TODO(jdennett): Add a test for noexcept member functions. +TEST(FunctionRefTest, NoExceptFunction) { + FunctionRef<int()> ref(NoExceptFunction); + EXPECT_EQ(1337, ref()); +} + +TEST(FunctionRefTest, ForwardsArgs) { + auto l = [](std::unique_ptr<int> i) { return *i; }; + FunctionRef<int(std::unique_ptr<int>)> ref(l); + EXPECT_EQ(42, ref(absl::make_unique<int>(42))); +} + +TEST(FunctionRef, ReturnMoveOnly) { + auto l = [] { return absl::make_unique<int>(29); }; + FunctionRef<std::unique_ptr<int>()> ref(l); + EXPECT_EQ(29, *ref()); +} + +TEST(FunctionRef, ManyArgs) { + auto l = [](int a, int b, int c) { return a + b + c; }; + FunctionRef<int(int, int, int)> ref(l); + EXPECT_EQ(6, ref(1, 2, 3)); +} + +TEST(FunctionRef, VoidResultFromNonVoidFunctor) { + bool ran = false; + auto l = [&]() -> int { + ran = true; + return 2; + }; + FunctionRef<void()> ref(l); + ref(); + EXPECT_TRUE(ran); +} + +TEST(FunctionRef, CastFromDerived) { + struct Base {}; + struct Derived : public Base {}; + + Derived d; + auto l1 = [&](Base* b) { EXPECT_EQ(&d, b); }; + FunctionRef<void(Derived*)> ref1(l1); + ref1(&d); + + auto l2 = [&]() -> Derived* { return &d; }; + FunctionRef<Base*()> ref2(l2); + EXPECT_EQ(&d, ref2()); +} + +TEST(FunctionRef, VoidResultFromNonVoidFuncton) { + FunctionRef<void()> ref(Function); + ref(); +} + +TEST(FunctionRef, MemberPtr) { + struct S { + int i; + }; + + S s{1100111}; + auto mem_ptr = &S::i; + FunctionRef<int(const S& s)> ref(mem_ptr); + EXPECT_EQ(1100111, ref(s)); +} + +TEST(FunctionRef, MemberFun) { + struct S { + int i; + int get_i() const { return i; } + }; + + S s{22}; + auto mem_fun_ptr = &S::get_i; + FunctionRef<int(const S& s)> ref(mem_fun_ptr); + EXPECT_EQ(22, ref(s)); +} + +TEST(FunctionRef, MemberFunRefqualified) { + struct S { + int i; + int get_i() && { return i; } + }; + auto mem_fun_ptr = &S::get_i; + S s{22}; + FunctionRef<int(S && s)> ref(mem_fun_ptr); + EXPECT_EQ(22, ref(std::move(s))); +} + +#if !defined(_WIN32) && defined(GTEST_HAS_DEATH_TEST) + +TEST(FunctionRef, MemberFunRefqualifiedNull) { + struct S { + int i; + int get_i() && { return i; } + }; + auto mem_fun_ptr = &S::get_i; + mem_fun_ptr = nullptr; + EXPECT_DEBUG_DEATH({ FunctionRef<int(S && s)> ref(mem_fun_ptr); }, ""); +} + +TEST(FunctionRef, NullMemberPtrAssertFails) { + struct S { + int i; + }; + using MemberPtr = int S::*; + MemberPtr mem_ptr = nullptr; + EXPECT_DEBUG_DEATH({ FunctionRef<int(const S& s)> ref(mem_ptr); }, ""); +} + +#endif // GTEST_HAS_DEATH_TEST + +TEST(FunctionRef, CopiesAndMovesPerPassByValue) { + absl::test_internal::InstanceTracker tracker; + absl::test_internal::CopyableMovableInstance instance(0); + auto l = [](absl::test_internal::CopyableMovableInstance) {}; + FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l); + ref(instance); + EXPECT_EQ(tracker.copies(), 1); + EXPECT_EQ(tracker.moves(), 1); +} + +TEST(FunctionRef, CopiesAndMovesPerPassByRef) { + absl::test_internal::InstanceTracker tracker; + absl::test_internal::CopyableMovableInstance instance(0); + auto l = [](const absl::test_internal::CopyableMovableInstance&) {}; + FunctionRef<void(const absl::test_internal::CopyableMovableInstance&)> ref(l); + ref(instance); + EXPECT_EQ(tracker.copies(), 0); + EXPECT_EQ(tracker.moves(), 0); +} + +TEST(FunctionRef, CopiesAndMovesPerPassByValueCallByMove) { + absl::test_internal::InstanceTracker tracker; + absl::test_internal::CopyableMovableInstance instance(0); + auto l = [](absl::test_internal::CopyableMovableInstance) {}; + FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l); + ref(std::move(instance)); + EXPECT_EQ(tracker.copies(), 0); + EXPECT_EQ(tracker.moves(), 2); +} + +TEST(FunctionRef, CopiesAndMovesPerPassByValueToRef) { + absl::test_internal::InstanceTracker tracker; + absl::test_internal::CopyableMovableInstance instance(0); + auto l = [](const absl::test_internal::CopyableMovableInstance&) {}; + FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l); + ref(std::move(instance)); + EXPECT_EQ(tracker.copies(), 0); + EXPECT_EQ(tracker.moves(), 1); +} + +TEST(FunctionRef, PassByValueTypes) { + using absl::functional_internal::Invoker; + using absl::functional_internal::VoidPtr; + using absl::test_internal::CopyableMovableInstance; + struct Trivial { + void* p[2]; + }; + struct LargeTrivial { + void* p[3]; + }; + + static_assert(std::is_same<Invoker<void, int>, void (*)(VoidPtr, int)>::value, + "Scalar types should be passed by value"); + static_assert( + std::is_same<Invoker<void, Trivial>, void (*)(VoidPtr, Trivial)>::value, + "Small trivial types should be passed by value"); + static_assert(std::is_same<Invoker<void, LargeTrivial>, + void (*)(VoidPtr, LargeTrivial &&)>::value, + "Large trivial types should be passed by rvalue reference"); + static_assert( + std::is_same<Invoker<void, CopyableMovableInstance>, + void (*)(VoidPtr, CopyableMovableInstance &&)>::value, + "Types with copy/move ctor should be passed by rvalue reference"); + + // References are passed as references. + static_assert( + std::is_same<Invoker<void, int&>, void (*)(VoidPtr, int&)>::value, + "Reference types should be preserved"); + static_assert( + std::is_same<Invoker<void, CopyableMovableInstance&>, + void (*)(VoidPtr, CopyableMovableInstance&)>::value, + "Reference types should be preserved"); + static_assert( + std::is_same<Invoker<void, CopyableMovableInstance&&>, + void (*)(VoidPtr, CopyableMovableInstance &&)>::value, + "Reference types should be preserved"); + + // Make sure the address of an object received by reference is the same as the + // addess of the object passed by the caller. + { + LargeTrivial obj; + auto test = [&obj](LargeTrivial& input) { ASSERT_EQ(&input, &obj); }; + absl::FunctionRef<void(LargeTrivial&)> ref(test); + ref(obj); + } + + { + Trivial obj; + auto test = [&obj](Trivial& input) { ASSERT_EQ(&input, &obj); }; + absl::FunctionRef<void(Trivial&)> ref(test); + ref(obj); + } +} + +} // namespace +ABSL_NAMESPACE_END +} // namespace absl |