239 lines
7.6 KiB
C++
239 lines
7.6 KiB
C++
// Copyright 2022 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 <memory>
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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 <utility>
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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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using ::testing::ElementsAre;
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using ::testing::Pointee;
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using ::testing::StaticAssertTypeEq;
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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)), 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)));
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}
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TEST(MakeFromTupleTest, String) {
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EXPECT_EQ(
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absl::make_from_tuple<std::string>(std::make_tuple("hello world", 5)),
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"hello");
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}
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TEST(MakeFromTupleTest, MoveOnlyParameter) {
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struct S {
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S(std::unique_ptr<int> n, std::unique_ptr<int> m) : value(*n + *m) {}
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int value = 0;
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};
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auto tup =
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std::make_tuple(absl::make_unique<int>(3), absl::make_unique<int>(4));
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auto s = absl::make_from_tuple<S>(std::move(tup));
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EXPECT_EQ(s.value, 7);
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}
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TEST(MakeFromTupleTest, NoParameters) {
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struct S {
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S() : value(1) {}
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int value = 2;
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};
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EXPECT_EQ(absl::make_from_tuple<S>(std::make_tuple()).value, 1);
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}
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TEST(MakeFromTupleTest, Pair) {
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EXPECT_EQ(
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(absl::make_from_tuple<std::pair<bool, int>>(std::make_tuple(true, 17))),
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std::make_pair(true, 17));
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}
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} // namespace
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