377 lines
13 KiB
C++
377 lines
13 KiB
C++
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// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/utility/utility.h"
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#include <sstream>
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#include <string>
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#include <tuple>
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#include <type_traits>
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#include <vector>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/base/attributes.h"
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#include "absl/memory/memory.h"
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#include "absl/strings/str_cat.h"
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namespace {
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#ifdef _MSC_VER
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// Warnings for unused variables in this test are false positives. On other
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// platforms, they are suppressed by ABSL_ATTRIBUTE_UNUSED, but that doesn't
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// work on MSVC.
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// Both the unused variables and the name length warnings are due to calls
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// to absl::make_index_sequence with very large values, creating very long type
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// names. The resulting warnings are so long they make build output unreadable.
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#pragma warning( push )
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#pragma warning( disable : 4503 ) // decorated name length exceeded
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#pragma warning( disable : 4101 ) // unreferenced local variable
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#endif // _MSC_VER
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using ::testing::ElementsAre;
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using ::testing::Pointee;
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using ::testing::StaticAssertTypeEq;
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TEST(IntegerSequenceTest, ValueType) {
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StaticAssertTypeEq<int, absl::integer_sequence<int>::value_type>();
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StaticAssertTypeEq<char, absl::integer_sequence<char>::value_type>();
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}
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TEST(IntegerSequenceTest, Size) {
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EXPECT_EQ(0, (absl::integer_sequence<int>::size()));
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EXPECT_EQ(1, (absl::integer_sequence<int, 0>::size()));
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EXPECT_EQ(1, (absl::integer_sequence<int, 1>::size()));
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EXPECT_EQ(2, (absl::integer_sequence<int, 1, 2>::size()));
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EXPECT_EQ(3, (absl::integer_sequence<int, 0, 1, 2>::size()));
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EXPECT_EQ(3, (absl::integer_sequence<int, -123, 123, 456>::size()));
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constexpr size_t sz = absl::integer_sequence<int, 0, 1>::size();
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EXPECT_EQ(2, sz);
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}
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TEST(IntegerSequenceTest, MakeIndexSequence) {
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StaticAssertTypeEq<absl::index_sequence<>, absl::make_index_sequence<0>>();
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StaticAssertTypeEq<absl::index_sequence<0>, absl::make_index_sequence<1>>();
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StaticAssertTypeEq<absl::index_sequence<0, 1>,
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absl::make_index_sequence<2>>();
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StaticAssertTypeEq<absl::index_sequence<0, 1, 2>,
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absl::make_index_sequence<3>>();
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}
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TEST(IntegerSequenceTest, MakeIntegerSequence) {
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StaticAssertTypeEq<absl::integer_sequence<int>,
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absl::make_integer_sequence<int, 0>>();
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StaticAssertTypeEq<absl::integer_sequence<int, 0>,
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absl::make_integer_sequence<int, 1>>();
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StaticAssertTypeEq<absl::integer_sequence<int, 0, 1>,
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absl::make_integer_sequence<int, 2>>();
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StaticAssertTypeEq<absl::integer_sequence<int, 0, 1, 2>,
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absl::make_integer_sequence<int, 3>>();
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}
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template <typename... Ts>
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class Counter {};
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template <size_t... Is>
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void CountAll(absl::index_sequence<Is...>) {
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// We only need an alias here, but instantiate a variable to silence warnings
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// for unused typedefs in some compilers.
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ABSL_ATTRIBUTE_UNUSED Counter<absl::make_index_sequence<Is>...> seq;
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}
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// This test verifies that absl::make_index_sequence can handle large arguments
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// without blowing up template instantiation stack, going OOM or taking forever
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// to compile (there is hard 15 minutes limit imposed by forge).
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TEST(IntegerSequenceTest, MakeIndexSequencePerformance) {
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// O(log N) template instantiations.
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// We only need an alias here, but instantiate a variable to silence warnings
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// for unused typedefs in some compilers.
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ABSL_ATTRIBUTE_UNUSED absl::make_index_sequence<(1 << 16) - 1> seq;
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// O(N) template instantiations.
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CountAll(absl::make_index_sequence<(1 << 8) - 1>());
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}
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template <typename F, typename Tup, size_t... Is>
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auto ApplyFromTupleImpl(F f, const Tup& tup, absl::index_sequence<Is...>)
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-> decltype(f(std::get<Is>(tup)...)) {
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return f(std::get<Is>(tup)...);
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}
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template <typename Tup>
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using TupIdxSeq = absl::make_index_sequence<std::tuple_size<Tup>::value>;
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template <typename F, typename Tup>
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auto ApplyFromTuple(F f, const Tup& tup)
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-> decltype(ApplyFromTupleImpl(f, tup, TupIdxSeq<Tup>{})) {
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return ApplyFromTupleImpl(f, tup, TupIdxSeq<Tup>{});
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}
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template <typename T>
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std::string Fmt(const T& x) {
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std::ostringstream os;
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os << x;
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return os.str();
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}
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struct PoorStrCat {
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template <typename... Args>
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std::string operator()(const Args&... args) const {
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std::string r;
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for (const auto& e : {Fmt(args)...}) r += e;
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return r;
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}
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};
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template <typename Tup, size_t... Is>
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std::vector<std::string> TupStringVecImpl(const Tup& tup,
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absl::index_sequence<Is...>) {
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return {Fmt(std::get<Is>(tup))...};
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}
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template <typename... Ts>
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std::vector<std::string> TupStringVec(const std::tuple<Ts...>& tup) {
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return TupStringVecImpl(tup, absl::index_sequence_for<Ts...>());
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}
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TEST(MakeIndexSequenceTest, ApplyFromTupleExample) {
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PoorStrCat f{};
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EXPECT_EQ("12abc3.14", f(12, "abc", 3.14));
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EXPECT_EQ("12abc3.14", ApplyFromTuple(f, std::make_tuple(12, "abc", 3.14)));
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}
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TEST(IndexSequenceForTest, Basic) {
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StaticAssertTypeEq<absl::index_sequence<>, absl::index_sequence_for<>>();
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StaticAssertTypeEq<absl::index_sequence<0>, absl::index_sequence_for<int>>();
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StaticAssertTypeEq<absl::index_sequence<0, 1, 2, 3>,
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absl::index_sequence_for<int, void, char, int>>();
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}
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TEST(IndexSequenceForTest, Example) {
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EXPECT_THAT(TupStringVec(std::make_tuple(12, "abc", 3.14)),
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ElementsAre("12", "abc", "3.14"));
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}
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int Function(int a, int b) { return a - b; }
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int Sink(std::unique_ptr<int> p) { return *p; }
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std::unique_ptr<int> Factory(int n) { return absl::make_unique<int>(n); }
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void NoOp() {}
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struct ConstFunctor {
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int operator()(int a, int b) const { return a - b; }
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};
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struct MutableFunctor {
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int operator()(int a, int b) { return a - b; }
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};
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struct EphemeralFunctor {
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EphemeralFunctor() {}
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EphemeralFunctor(const EphemeralFunctor&) {}
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EphemeralFunctor(EphemeralFunctor&&) {}
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int operator()(int a, int b) && { return a - b; }
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};
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struct OverloadedFunctor {
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OverloadedFunctor() {}
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OverloadedFunctor(const OverloadedFunctor&) {}
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OverloadedFunctor(OverloadedFunctor&&) {}
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template <typename... Args>
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std::string operator()(const Args&... args) & {
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return absl::StrCat("&", args...);
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}
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template <typename... Args>
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std::string operator()(const Args&... args) const& {
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return absl::StrCat("const&", args...);
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}
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template <typename... Args>
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std::string operator()(const Args&... args) && {
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return absl::StrCat("&&", args...);
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}
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};
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struct Class {
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int Method(int a, int b) { return a - b; }
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int ConstMethod(int a, int b) const { return a - b; }
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int member;
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};
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struct FlipFlop {
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int ConstMethod() const { return member; }
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FlipFlop operator*() const { return {-member}; }
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int member;
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};
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TEST(ApplyTest, Function) {
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EXPECT_EQ(1, absl::apply(Function, std::make_tuple(3, 2)));
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EXPECT_EQ(1, absl::apply(&Function, std::make_tuple(3, 2)));
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}
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TEST(ApplyTest, NonCopyableArgument) {
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EXPECT_EQ(42, absl::apply(Sink, std::make_tuple(absl::make_unique<int>(42))));
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}
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TEST(ApplyTest, NonCopyableResult) {
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EXPECT_THAT(absl::apply(Factory, std::make_tuple(42)),
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::testing::Pointee(42));
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}
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TEST(ApplyTest, VoidResult) { absl::apply(NoOp, std::tuple<>()); }
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TEST(ApplyTest, ConstFunctor) {
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EXPECT_EQ(1, absl::apply(ConstFunctor(), std::make_tuple(3, 2)));
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}
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TEST(ApplyTest, MutableFunctor) {
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MutableFunctor f;
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EXPECT_EQ(1, absl::apply(f, std::make_tuple(3, 2)));
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EXPECT_EQ(1, absl::apply(MutableFunctor(), std::make_tuple(3, 2)));
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}
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TEST(ApplyTest, EphemeralFunctor) {
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EphemeralFunctor f;
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EXPECT_EQ(1, absl::apply(std::move(f), std::make_tuple(3, 2)));
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EXPECT_EQ(1, absl::apply(EphemeralFunctor(), std::make_tuple(3, 2)));
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}
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TEST(ApplyTest, OverloadedFunctor) {
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OverloadedFunctor f;
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const OverloadedFunctor& cf = f;
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EXPECT_EQ("&", absl::apply(f, std::tuple<>{}));
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EXPECT_EQ("& 42", absl::apply(f, std::make_tuple(" 42")));
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EXPECT_EQ("const&", absl::apply(cf, std::tuple<>{}));
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EXPECT_EQ("const& 42", absl::apply(cf, std::make_tuple(" 42")));
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EXPECT_EQ("&&", absl::apply(std::move(f), std::tuple<>{}));
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OverloadedFunctor f2;
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EXPECT_EQ("&& 42", absl::apply(std::move(f2), std::make_tuple(" 42")));
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}
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TEST(ApplyTest, ReferenceWrapper) {
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ConstFunctor cf;
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MutableFunctor mf;
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EXPECT_EQ(1, absl::apply(std::cref(cf), std::make_tuple(3, 2)));
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EXPECT_EQ(1, absl::apply(std::ref(cf), std::make_tuple(3, 2)));
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EXPECT_EQ(1, absl::apply(std::ref(mf), std::make_tuple(3, 2)));
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}
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TEST(ApplyTest, MemberFunction) {
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std::unique_ptr<Class> p(new Class);
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std::unique_ptr<const Class> cp(new Class);
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EXPECT_EQ(
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1, absl::apply(&Class::Method,
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std::tuple<std::unique_ptr<Class>&, int, int>(p, 3, 2)));
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EXPECT_EQ(1, absl::apply(&Class::Method,
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std::tuple<Class*, int, int>(p.get(), 3, 2)));
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EXPECT_EQ(
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1, absl::apply(&Class::Method, std::tuple<Class&, int, int>(*p, 3, 2)));
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EXPECT_EQ(
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1, absl::apply(&Class::ConstMethod,
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std::tuple<std::unique_ptr<Class>&, int, int>(p, 3, 2)));
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EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
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std::tuple<Class*, int, int>(p.get(), 3, 2)));
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EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
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std::tuple<Class&, int, int>(*p, 3, 2)));
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EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
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std::tuple<std::unique_ptr<const Class>&, int, int>(
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cp, 3, 2)));
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EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
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std::tuple<const Class*, int, int>(cp.get(), 3, 2)));
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EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
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std::tuple<const Class&, int, int>(*cp, 3, 2)));
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EXPECT_EQ(1, absl::apply(&Class::Method,
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std::make_tuple(absl::make_unique<Class>(), 3, 2)));
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EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
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std::make_tuple(absl::make_unique<Class>(), 3, 2)));
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EXPECT_EQ(
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1, absl::apply(&Class::ConstMethod,
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std::make_tuple(absl::make_unique<const Class>(), 3, 2)));
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}
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TEST(ApplyTest, DataMember) {
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std::unique_ptr<Class> p(new Class{42});
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std::unique_ptr<const Class> cp(new Class{42});
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EXPECT_EQ(
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42, absl::apply(&Class::member, std::tuple<std::unique_ptr<Class>&>(p)));
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EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<Class&>(*p)));
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EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<Class*>(p.get())));
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absl::apply(&Class::member, std::tuple<std::unique_ptr<Class>&>(p)) = 42;
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absl::apply(&Class::member, std::tuple<Class*>(p.get())) = 42;
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absl::apply(&Class::member, std::tuple<Class&>(*p)) = 42;
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EXPECT_EQ(42, absl::apply(&Class::member,
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std::tuple<std::unique_ptr<const Class>&>(cp)));
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EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<const Class&>(*cp)));
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EXPECT_EQ(42,
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absl::apply(&Class::member, std::tuple<const Class*>(cp.get())));
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}
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TEST(ApplyTest, FlipFlop) {
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FlipFlop obj = {42};
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// This call could resolve to (obj.*&FlipFlop::ConstMethod)() or
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// ((*obj).*&FlipFlop::ConstMethod)(). We verify that it's the former.
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EXPECT_EQ(42, absl::apply(&FlipFlop::ConstMethod, std::make_tuple(obj)));
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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
|
||
|
|
|