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Changes imported from Abseil "staging" branch:

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- 5e874e644191fbf99f5636d6303de2b28b23392c Adds a absl::apply function, similar to c++17's std::apply. by Abseil Team <absl-team@google.com>
  - 16373c438d16a09725dace03ab7ba0f7c2337279 Add debugging_internal::StackTraceWorksForTest by Abseil Team <absl-team@google.com>
  - a623257aaaff8a5fba3377f34f92f319a104e444 Update absl::CondVar documentation in response to GitHub ... by Derek Mauro <dmauro@google.com>
  - 87d58a25bc4ecd46165dd1c417121c86cbc07be0 Add assert against uint128 negative bit shift undefined b... by Alex Strelnikov <strel@google.com>
  - af155c0d2a3556b56a9bcd6f9ee7416277185df8 Fix comment typos. by Abseil Team <absl-team@google.com>
  - 1824ae832eb75d447dea730b5968d952897e135a Rollback of: Add debugging_internal::StackTraceWorksForTest by Abseil Team <absl-team@google.com>
  - 97318f087ce63dd5acf1e0d3d697cd90a7d6ebfd Add debugging_internal::StackTraceWorksForTest by Abseil Team <absl-team@google.com>
  - 9dd1d17dca17f0ded3bda336b7521fd57d08a5cc Move log_severity.h out of internal. by Abseil Team <absl-team@google.com>
  - 2212bb56b1a8365d2303ff0983441298d08444e5 Internal change. by Alex Strelnikov <strel@google.com>

GitOrigin-RevId: 5e874e644191fbf99f5636d6303de2b28b23392c
Change-Id: Ic270393ac1f15866afb64617d28269cd829030f6
This commit is contained in:
Abseil Team 2018-01-17 09:53:47 -08:00 • committed by vslashg
parent be40fdf1a8
commit 5a8de8a37e
19 changed files with 326 additions and 58 deletions
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178
absl/utility/utility_test.cc
View file

@ -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<int, absl::integer_sequence<int>::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<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)));
}
} // namespace