diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/utility')
| -rw-r--r-- | third_party/abseil_cpp/absl/utility/BUILD.bazel | 55 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/utility/CMakeLists.txt | 44 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/utility/utility.h | 350 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/utility/utility_test.cc | 376 |
4 files changed, 825 insertions, 0 deletions
diff --git a/third_party/abseil_cpp/absl/utility/BUILD.bazel b/third_party/abseil_cpp/absl/utility/BUILD.bazel new file mode 100644 index 000000000000..02b2c407f847 --- /dev/null +++ b/third_party/abseil_cpp/absl/utility/BUILD.bazel @@ -0,0 +1,55 @@ +# +# 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. +# + +load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test") +load( + "//absl:copts/configure_copts.bzl", + "ABSL_DEFAULT_COPTS", + "ABSL_DEFAULT_LINKOPTS", + "ABSL_TEST_COPTS", +) + +package(default_visibility = ["//visibility:public"]) + +licenses(["notice"]) + +cc_library( + name = "utility", + hdrs = [ + "utility.h", + ], + copts = ABSL_DEFAULT_COPTS, + linkopts = ABSL_DEFAULT_LINKOPTS, + deps = [ + "//absl/base:base_internal", + "//absl/base:config", + "//absl/meta:type_traits", + ], +) + +cc_test( + name = "utility_test", + srcs = ["utility_test.cc"], + copts = ABSL_TEST_COPTS, + linkopts = ABSL_DEFAULT_LINKOPTS, + deps = [ + ":utility", + "//absl/base:core_headers", + "//absl/memory", + "//absl/strings", + "@com_google_googletest//:gtest_main", + ], +) diff --git a/third_party/abseil_cpp/absl/utility/CMakeLists.txt b/third_party/abseil_cpp/absl/utility/CMakeLists.txt new file mode 100644 index 000000000000..e1edd19aa013 --- /dev/null +++ b/third_party/abseil_cpp/absl/utility/CMakeLists.txt @@ -0,0 +1,44 @@ +# +# Copyright 2017 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. +# + +absl_cc_library( + NAME + utility + HDRS + "utility.h" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::base_internal + absl::config + absl::type_traits + PUBLIC +) + +absl_cc_test( + NAME + utility_test + SRCS + "utility_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::utility + absl::core_headers + absl::memory + absl::strings + gmock_main +) diff --git a/third_party/abseil_cpp/absl/utility/utility.h b/third_party/abseil_cpp/absl/utility/utility.h new file mode 100644 index 000000000000..bf9232209a9b --- /dev/null +++ b/third_party/abseil_cpp/absl/utility/utility.h @@ -0,0 +1,350 @@ +// Copyright 2017 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. +// +// This header file contains C++11 versions of standard <utility> header +// abstractions available within C++14 and C++17, and are designed to be drop-in +// replacement for code compliant with C++14 and C++17. +// +// The following abstractions are defined: +// +// * integer_sequence<T, Ints...> == std::integer_sequence<T, Ints...> +// * index_sequence<Ints...> == std::index_sequence<Ints...> +// * make_integer_sequence<T, N> == std::make_integer_sequence<T, N> +// * make_index_sequence<N> == std::make_index_sequence<N> +// * index_sequence_for<Ts...> == std::index_sequence_for<Ts...> +// * apply<Functor, Tuple> == std::apply<Functor, Tuple> +// * exchange<T> == std::exchange<T> +// * make_from_tuple<T> == std::make_from_tuple<T> +// +// This header file also provides the tag types `in_place_t`, `in_place_type_t`, +// and `in_place_index_t`, as well as the constant `in_place`, and +// `constexpr` `std::move()` and `std::forward()` implementations in C++11. +// +// References: +// +// https://en.cppreference.com/w/cpp/utility/integer_sequence +// https://en.cppreference.com/w/cpp/utility/apply +// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3658.html + +#ifndef ABSL_UTILITY_UTILITY_H_ +#define ABSL_UTILITY_UTILITY_H_ + +#include <cstddef> +#include <cstdlib> +#include <tuple> +#include <utility> + +#include "absl/base/config.h" +#include "absl/base/internal/inline_variable.h" +#include "absl/base/internal/invoke.h" +#include "absl/meta/type_traits.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN + +// integer_sequence +// +// Class template representing a compile-time integer sequence. An instantiation +// of `integer_sequence<T, Ints...>` has a sequence of integers encoded in its +// type through its template arguments (which is a common need when +// working with C++11 variadic templates). `absl::integer_sequence` is designed +// to be a drop-in replacement for C++14's `std::integer_sequence`. +// +// Example: +// +// template< class T, T... Ints > +// void user_function(integer_sequence<T, Ints...>); +// +// int main() +// { +// // user_function's `T` will be deduced to `int` and `Ints...` +// // will be deduced to `0, 1, 2, 3, 4`. +// user_function(make_integer_sequence<int, 5>()); +// } +template <typename T, T... Ints> +struct integer_sequence { + using value_type = T; + static constexpr size_t size() noexcept { return sizeof...(Ints); } +}; + +// index_sequence +// +// A helper template for an `integer_sequence` of `size_t`, +// `absl::index_sequence` is designed to be a drop-in replacement for C++14's +// `std::index_sequence`. +template <size_t... Ints> +using index_sequence = integer_sequence<size_t, Ints...>; + +namespace utility_internal { + +template <typename Seq, size_t SeqSize, size_t Rem> +struct Extend; + +// Note that SeqSize == sizeof...(Ints). It's passed explicitly for efficiency. +template <typename T, T... Ints, size_t SeqSize> +struct Extend<integer_sequence<T, Ints...>, SeqSize, 0> { + using type = integer_sequence<T, Ints..., (Ints + SeqSize)...>; +}; + +template <typename T, T... Ints, size_t SeqSize> +struct Extend<integer_sequence<T, Ints...>, SeqSize, 1> { + using type = integer_sequence<T, Ints..., (Ints + SeqSize)..., 2 * SeqSize>; +}; + +// Recursion helper for 'make_integer_sequence<T, N>'. +// 'Gen<T, N>::type' is an alias for 'integer_sequence<T, 0, 1, ... N-1>'. +template <typename T, size_t N> +struct Gen { + using type = + typename Extend<typename Gen<T, N / 2>::type, N / 2, N % 2>::type; +}; + +template <typename T> +struct Gen<T, 0> { + using type = integer_sequence<T>; +}; + +template <typename T> +struct InPlaceTypeTag { + explicit InPlaceTypeTag() = delete; + InPlaceTypeTag(const InPlaceTypeTag&) = delete; + InPlaceTypeTag& operator=(const InPlaceTypeTag&) = delete; +}; + +template <size_t I> +struct InPlaceIndexTag { + explicit InPlaceIndexTag() = delete; + InPlaceIndexTag(const InPlaceIndexTag&) = delete; + InPlaceIndexTag& operator=(const InPlaceIndexTag&) = delete; +}; + +} // namespace utility_internal + +// Compile-time sequences of integers + +// make_integer_sequence +// +// This template alias is equivalent to +// `integer_sequence<int, 0, 1, ..., N-1>`, and is designed to be a drop-in +// replacement for C++14's `std::make_integer_sequence`. +template <typename T, T N> +using make_integer_sequence = typename utility_internal::Gen<T, N>::type; + +// make_index_sequence +// +// This template alias is equivalent to `index_sequence<0, 1, ..., N-1>`, +// and is designed to be a drop-in replacement for C++14's +// `std::make_index_sequence`. +template <size_t N> +using make_index_sequence = make_integer_sequence<size_t, N>; + +// index_sequence_for +// +// Converts a typename pack into an index sequence of the same length, and +// is designed to be a drop-in replacement for C++14's +// `std::index_sequence_for()` +template <typename... Ts> +using index_sequence_for = make_index_sequence<sizeof...(Ts)>; + +// Tag types + +#ifdef ABSL_USES_STD_OPTIONAL + +using std::in_place_t; +using std::in_place; + +#else // ABSL_USES_STD_OPTIONAL + +// in_place_t +// +// Tag type used to specify in-place construction, such as with +// `absl::optional`, designed to be a drop-in replacement for C++17's +// `std::in_place_t`. +struct in_place_t {}; + +ABSL_INTERNAL_INLINE_CONSTEXPR(in_place_t, in_place, {}); + +#endif // ABSL_USES_STD_OPTIONAL + +#if defined(ABSL_USES_STD_ANY) || defined(ABSL_USES_STD_VARIANT) +using std::in_place_type; +using std::in_place_type_t; +#else + +// in_place_type_t +// +// Tag type used for in-place construction when the type to construct needs to +// be specified, such as with `absl::any`, designed to be a drop-in replacement +// for C++17's `std::in_place_type_t`. +template <typename T> +using in_place_type_t = void (*)(utility_internal::InPlaceTypeTag<T>); + +template <typename T> +void in_place_type(utility_internal::InPlaceTypeTag<T>) {} +#endif // ABSL_USES_STD_ANY || ABSL_USES_STD_VARIANT + +#ifdef ABSL_USES_STD_VARIANT +using std::in_place_index; +using std::in_place_index_t; +#else + +// in_place_index_t +// +// Tag type used for in-place construction when the type to construct needs to +// be specified, such as with `absl::any`, designed to be a drop-in replacement +// for C++17's `std::in_place_index_t`. +template <size_t I> +using in_place_index_t = void (*)(utility_internal::InPlaceIndexTag<I>); + +template <size_t I> +void in_place_index(utility_internal::InPlaceIndexTag<I>) {} +#endif // ABSL_USES_STD_VARIANT + +// Constexpr move and forward + +// move() +// +// A constexpr version of `std::move()`, designed to be a drop-in replacement +// for C++14's `std::move()`. +template <typename T> +constexpr absl::remove_reference_t<T>&& move(T&& t) noexcept { + return static_cast<absl::remove_reference_t<T>&&>(t); +} + +// forward() +// +// A constexpr version of `std::forward()`, designed to be a drop-in replacement +// for C++14's `std::forward()`. +template <typename T> +constexpr T&& forward( + absl::remove_reference_t<T>& t) noexcept { // NOLINT(runtime/references) + return static_cast<T&&>(t); +} + +namespace utility_internal { +// Helper method for expanding tuple into a called method. +template <typename Functor, typename Tuple, std::size_t... Indexes> +auto apply_helper(Functor&& functor, Tuple&& t, index_sequence<Indexes...>) + -> decltype(absl::base_internal::invoke( + absl::forward<Functor>(functor), + std::get<Indexes>(absl::forward<Tuple>(t))...)) { + return absl::base_internal::invoke( + absl::forward<Functor>(functor), + std::get<Indexes>(absl::forward<Tuple>(t))...); +} + +} // namespace utility_internal + +// apply +// +// Invokes a Callable using elements of a tuple as its arguments. +// Each element of the tuple corresponds to an argument of the call (in order). +// Both the Callable argument and the tuple argument are perfect-forwarded. +// For member-function Callables, the first tuple element acts as the `this` +// pointer. `absl::apply` is designed to be a drop-in replacement for C++17's +// `std::apply`. Unlike C++17's `std::apply`, this is not currently `constexpr`. +// +// Example: +// +// class Foo { +// public: +// void Bar(int); +// }; +// void user_function1(int, std::string); +// void user_function2(std::unique_ptr<Foo>); +// auto user_lambda = [](int, int) {}; +// +// int main() +// { +// std::tuple<int, std::string> tuple1(42, "bar"); +// // Invokes the first user function on int, std::string. +// absl::apply(&user_function1, tuple1); +// +// std::tuple<std::unique_ptr<Foo>> tuple2(absl::make_unique<Foo>()); +// // Invokes the user function that takes ownership of the unique +// // pointer. +// absl::apply(&user_function2, std::move(tuple2)); +// +// auto foo = absl::make_unique<Foo>(); +// std::tuple<Foo*, int> tuple3(foo.get(), 42); +// // Invokes the method Bar on foo with one argument, 42. +// absl::apply(&Foo::Bar, tuple3); +// +// std::tuple<int, int> tuple4(8, 9); +// // Invokes a lambda. +// absl::apply(user_lambda, tuple4); +// } +template <typename Functor, typename Tuple> +auto apply(Functor&& functor, Tuple&& t) + -> decltype(utility_internal::apply_helper( + absl::forward<Functor>(functor), absl::forward<Tuple>(t), + absl::make_index_sequence<std::tuple_size< + typename std::remove_reference<Tuple>::type>::value>{})) { + return utility_internal::apply_helper( + absl::forward<Functor>(functor), absl::forward<Tuple>(t), + absl::make_index_sequence<std::tuple_size< + typename std::remove_reference<Tuple>::type>::value>{}); +} + +// exchange +// +// Replaces the value of `obj` with `new_value` and returns the old value of +// `obj`. `absl::exchange` is designed to be a drop-in replacement for C++14's +// `std::exchange`. +// +// Example: +// +// Foo& operator=(Foo&& other) { +// ptr1_ = absl::exchange(other.ptr1_, nullptr); +// int1_ = absl::exchange(other.int1_, -1); +// return *this; +// } +template <typename T, typename U = T> +T exchange(T& obj, U&& new_value) { + T old_value = absl::move(obj); + obj = absl::forward<U>(new_value); + return old_value; +} + +namespace utility_internal { +template <typename T, typename Tuple, size_t... I> +T make_from_tuple_impl(Tuple&& tup, absl::index_sequence<I...>) { + return T(std::get<I>(std::forward<Tuple>(tup))...); +} +} // namespace utility_internal + +// make_from_tuple +// +// Given the template parameter type `T` and a tuple of arguments +// `std::tuple(arg0, arg1, ..., argN)` constructs an object of type `T` as if by +// calling `T(arg0, arg1, ..., argN)`. +// +// Example: +// +// std::tuple<const char*, size_t> args("hello world", 5); +// auto s = absl::make_from_tuple<std::string>(args); +// assert(s == "hello"); +// +template <typename T, typename Tuple> +constexpr T make_from_tuple(Tuple&& tup) { + return utility_internal::make_from_tuple_impl<T>( + std::forward<Tuple>(tup), + absl::make_index_sequence< + std::tuple_size<absl::decay_t<Tuple>>::value>{}); +} + +ABSL_NAMESPACE_END +} // namespace absl + +#endif // ABSL_UTILITY_UTILITY_H_ diff --git a/third_party/abseil_cpp/absl/utility/utility_test.cc b/third_party/abseil_cpp/absl/utility/utility_test.cc new file mode 100644 index 000000000000..f044ad644a4d --- /dev/null +++ b/third_party/abseil_cpp/absl/utility/utility_test.cc @@ -0,0 +1,376 @@ +// Copyright 2017 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/utility/utility.h" + +#include <sstream> +#include <string> +#include <tuple> +#include <type_traits> +#include <vector> + +#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 { + +#ifdef _MSC_VER +// Warnings for unused variables in this test are false positives. On other +// platforms, they are suppressed by ABSL_ATTRIBUTE_UNUSED, but that doesn't +// work on MSVC. +// Both the unused variables and the name length warnings are due to calls +// to absl::make_index_sequence with very large values, creating very long type +// names. The resulting warnings are so long they make build output unreadable. +#pragma warning( push ) +#pragma warning( disable : 4503 ) // decorated name length exceeded +#pragma warning( disable : 4101 ) // unreferenced local variable +#endif // _MSC_VER + +using ::testing::ElementsAre; +using ::testing::Pointee; +using ::testing::StaticAssertTypeEq; + +TEST(IntegerSequenceTest, ValueType) { + StaticAssertTypeEq<int, absl::integer_sequence<int>::value_type>(); + StaticAssertTypeEq<char, absl::integer_sequence<char>::value_type>(); +} + +TEST(IntegerSequenceTest, Size) { + EXPECT_EQ(0, (absl::integer_sequence<int>::size())); + EXPECT_EQ(1, (absl::integer_sequence<int, 0>::size())); + EXPECT_EQ(1, (absl::integer_sequence<int, 1>::size())); + EXPECT_EQ(2, (absl::integer_sequence<int, 1, 2>::size())); + EXPECT_EQ(3, (absl::integer_sequence<int, 0, 1, 2>::size())); + EXPECT_EQ(3, (absl::integer_sequence<int, -123, 123, 456>::size())); + constexpr size_t sz = absl::integer_sequence<int, 0, 1>::size(); + EXPECT_EQ(2, sz); +} + +TEST(IntegerSequenceTest, MakeIndexSequence) { + StaticAssertTypeEq<absl::index_sequence<>, absl::make_index_sequence<0>>(); + StaticAssertTypeEq<absl::index_sequence<0>, absl::make_index_sequence<1>>(); + StaticAssertTypeEq<absl::index_sequence<0, 1>, + absl::make_index_sequence<2>>(); + StaticAssertTypeEq<absl::index_sequence<0, 1, 2>, + absl::make_index_sequence<3>>(); +} + +TEST(IntegerSequenceTest, MakeIntegerSequence) { + StaticAssertTypeEq<absl::integer_sequence<int>, + absl::make_integer_sequence<int, 0>>(); + StaticAssertTypeEq<absl::integer_sequence<int, 0>, + absl::make_integer_sequence<int, 1>>(); + StaticAssertTypeEq<absl::integer_sequence<int, 0, 1>, + absl::make_integer_sequence<int, 2>>(); + StaticAssertTypeEq<absl::integer_sequence<int, 0, 1, 2>, + absl::make_integer_sequence<int, 3>>(); +} + +template <typename... Ts> +class Counter {}; + +template <size_t... Is> +void CountAll(absl::index_sequence<Is...>) { + // We only need an alias here, but instantiate a variable to silence warnings + // for unused typedefs in some compilers. + ABSL_ATTRIBUTE_UNUSED Counter<absl::make_index_sequence<Is>...> seq; +} + +// This test verifies that absl::make_index_sequence can handle large arguments +// without blowing up template instantiation stack, going OOM or taking forever +// to compile (there is hard 15 minutes limit imposed by forge). +TEST(IntegerSequenceTest, MakeIndexSequencePerformance) { + // O(log N) template instantiations. + // We only need an alias here, but instantiate a variable to silence warnings + // for unused typedefs in some compilers. + ABSL_ATTRIBUTE_UNUSED absl::make_index_sequence<(1 << 16) - 1> seq; + // O(N) template instantiations. + CountAll(absl::make_index_sequence<(1 << 8) - 1>()); +} + +template <typename F, typename Tup, size_t... Is> +auto ApplyFromTupleImpl(F f, const Tup& tup, absl::index_sequence<Is...>) + -> decltype(f(std::get<Is>(tup)...)) { + return f(std::get<Is>(tup)...); +} + +template <typename Tup> +using TupIdxSeq = absl::make_index_sequence<std::tuple_size<Tup>::value>; + +template <typename F, typename Tup> +auto ApplyFromTuple(F f, const Tup& tup) + -> decltype(ApplyFromTupleImpl(f, tup, TupIdxSeq<Tup>{})) { + return ApplyFromTupleImpl(f, tup, TupIdxSeq<Tup>{}); +} + +template <typename T> +std::string Fmt(const T& x) { + std::ostringstream os; + os << x; + return os.str(); +} + +struct PoorStrCat { + template <typename... Args> + std::string operator()(const Args&... args) const { + std::string r; + for (const auto& e : {Fmt(args)...}) r += e; + return r; + } +}; + +template <typename Tup, size_t... Is> +std::vector<std::string> TupStringVecImpl(const Tup& tup, + absl::index_sequence<Is...>) { + return {Fmt(std::get<Is>(tup))...}; +} + +template <typename... Ts> +std::vector<std::string> TupStringVec(const std::tuple<Ts...>& tup) { + return TupStringVecImpl(tup, absl::index_sequence_for<Ts...>()); +} + +TEST(MakeIndexSequenceTest, ApplyFromTupleExample) { + PoorStrCat f{}; + EXPECT_EQ("12abc3.14", f(12, "abc", 3.14)); + EXPECT_EQ("12abc3.14", ApplyFromTuple(f, std::make_tuple(12, "abc", 3.14))); +} + +TEST(IndexSequenceForTest, Basic) { + StaticAssertTypeEq<absl::index_sequence<>, absl::index_sequence_for<>>(); + StaticAssertTypeEq<absl::index_sequence<0>, absl::index_sequence_for<int>>(); + StaticAssertTypeEq<absl::index_sequence<0, 1, 2, 3>, + absl::index_sequence_for<int, void, char, int>>(); +} + +TEST(IndexSequenceForTest, Example) { + EXPECT_THAT(TupStringVec(std::make_tuple(12, "abc", 3.14)), + ElementsAre("12", "abc", "3.14")); +} + +int Function(int a, int b) { return a - b; } + +int Sink(std::unique_ptr<int> p) { return *p; } + +std::unique_ptr<int> Factory(int n) { return absl::make_unique<int>(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 <typename... Args> + std::string operator()(const Args&... args) & { + return absl::StrCat("&", args...); + } + template <typename... Args> + std::string operator()(const Args&... args) const& { + return absl::StrCat("const&", args...); + } + template <typename... Args> + 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<int>(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<Class> p(new Class); + std::unique_ptr<const Class> cp(new Class); + EXPECT_EQ( + 1, absl::apply(&Class::Method, + std::tuple<std::unique_ptr<Class>&, int, int>(p, 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::Method, + std::tuple<Class*, int, int>(p.get(), 3, 2))); + EXPECT_EQ( + 1, absl::apply(&Class::Method, std::tuple<Class&, int, int>(*p, 3, 2))); + + EXPECT_EQ( + 1, absl::apply(&Class::ConstMethod, + std::tuple<std::unique_ptr<Class>&, int, int>(p, 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple<Class*, int, int>(p.get(), 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple<Class&, int, int>(*p, 3, 2))); + + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple<std::unique_ptr<const Class>&, int, int>( + cp, 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple<const Class*, int, int>(cp.get(), 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::tuple<const Class&, int, int>(*cp, 3, 2))); + + EXPECT_EQ(1, absl::apply(&Class::Method, + std::make_tuple(absl::make_unique<Class>(), 3, 2))); + EXPECT_EQ(1, absl::apply(&Class::ConstMethod, + std::make_tuple(absl::make_unique<Class>(), 3, 2))); + EXPECT_EQ( + 1, absl::apply(&Class::ConstMethod, + std::make_tuple(absl::make_unique<const Class>(), 3, 2))); +} + +TEST(ApplyTest, DataMember) { + std::unique_ptr<Class> p(new Class{42}); + std::unique_ptr<const Class> cp(new Class{42}); + EXPECT_EQ( + 42, absl::apply(&Class::member, std::tuple<std::unique_ptr<Class>&>(p))); + EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<Class&>(*p))); + EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<Class*>(p.get()))); + + absl::apply(&Class::member, std::tuple<std::unique_ptr<Class>&>(p)) = 42; + absl::apply(&Class::member, std::tuple<Class*>(p.get())) = 42; + absl::apply(&Class::member, std::tuple<Class&>(*p)) = 42; + + EXPECT_EQ(42, absl::apply(&Class::member, + std::tuple<std::unique_ptr<const Class>&>(cp))); + EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<const Class&>(*cp))); + EXPECT_EQ(42, + absl::apply(&Class::member, std::tuple<const Class*>(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))); +} + +TEST(ExchangeTest, MoveOnly) { + auto a = Factory(1); + EXPECT_EQ(1, *a); + auto b = absl::exchange(a, Factory(2)); + EXPECT_EQ(2, *a); + EXPECT_EQ(1, *b); +} + +TEST(MakeFromTupleTest, String) { + EXPECT_EQ( + absl::make_from_tuple<std::string>(std::make_tuple("hello world", 5)), + "hello"); +} + +TEST(MakeFromTupleTest, MoveOnlyParameter) { + struct S { + S(std::unique_ptr<int> n, std::unique_ptr<int> m) : value(*n + *m) {} + int value = 0; + }; + auto tup = + std::make_tuple(absl::make_unique<int>(3), absl::make_unique<int>(4)); + auto s = absl::make_from_tuple<S>(std::move(tup)); + EXPECT_EQ(s.value, 7); +} + +TEST(MakeFromTupleTest, NoParameters) { + struct S { + S() : value(1) {} + int value = 2; + }; + EXPECT_EQ(absl::make_from_tuple<S>(std::make_tuple()).value, 1); +} + +TEST(MakeFromTupleTest, Pair) { + EXPECT_EQ( + (absl::make_from_tuple<std::pair<bool, int>>(std::make_tuple(true, 17))), + std::make_pair(true, 17)); +} + +} // namespace + |