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optional_test.cc
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optional_test.cc
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// 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
//
// http://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/types/optional.h"
#include <string>
#include <type_traits>
#include <utility>
#include "gtest/gtest.h"
#include "absl/base/config.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/meta/type_traits.h"
#include "absl/strings/string_view.h"
struct Hashable {};
namespace std {
template <>
struct hash<Hashable> {
size_t operator()(const Hashable&) { return 0; }
};
} // namespace std
struct NonHashable {};
namespace {
std::string TypeQuals(std::string&) { return "&"; }
std::string TypeQuals(std::string&&) { return "&&"; }
std::string TypeQuals(const std::string&) { return "c&"; }
std::string TypeQuals(const std::string&&) { return "c&&"; }
struct StructorListener {
int construct0 = 0;
int construct1 = 0;
int construct2 = 0;
int listinit = 0;
int copy = 0;
int move = 0;
int copy_assign = 0;
int move_assign = 0;
int destruct = 0;
int volatile_copy = 0;
int volatile_move = 0;
int volatile_copy_assign = 0;
int volatile_move_assign = 0;
};
// Suppress MSVC warnings.
// 4521: multiple copy constructors specified
// 4522: multiple assignment operators specified
// We wrote multiple of them to test that the correct overloads are selected.
#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable : 4521)
#pragma warning( disable : 4522)
#endif
struct Listenable {
static StructorListener* listener;
Listenable() { ++listener->construct0; }
explicit Listenable(int /*unused*/) { ++listener->construct1; }
Listenable(int /*unused*/, int /*unused*/) { ++listener->construct2; }
Listenable(std::initializer_list<int> /*unused*/) { ++listener->listinit; }
Listenable(const Listenable& /*unused*/) { ++listener->copy; }
Listenable(const volatile Listenable& /*unused*/) {
++listener->volatile_copy;
}
Listenable(volatile Listenable&& /*unused*/) { ++listener->volatile_move; }
Listenable(Listenable&& /*unused*/) { ++listener->move; }
Listenable& operator=(const Listenable& /*unused*/) {
++listener->copy_assign;
return *this;
}
Listenable& operator=(Listenable&& /*unused*/) {
++listener->move_assign;
return *this;
}
// use void return type instead of volatile T& to work around GCC warning
// when the assignment's returned reference is ignored.
void operator=(const volatile Listenable& /*unused*/) volatile {
++listener->volatile_copy_assign;
}
void operator=(volatile Listenable&& /*unused*/) volatile {
++listener->volatile_move_assign;
}
~Listenable() { ++listener->destruct; }
};
#ifdef _MSC_VER
#pragma warning( pop )
#endif
StructorListener* Listenable::listener = nullptr;
// ABSL_HAVE_NO_CONSTEXPR_INITIALIZER_LIST is defined to 1 when the standard
// library implementation doesn't marked initializer_list's default constructor
// constexpr. The C++11 standard doesn't specify constexpr on it, but C++14
// added it. However, libstdc++ 4.7 marked it constexpr.
#if defined(_LIBCPP_VERSION) && \
(_LIBCPP_STD_VER <= 11 || defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR))
#define ABSL_HAVE_NO_CONSTEXPR_INITIALIZER_LIST 1
#endif
struct ConstexprType {
enum CtorTypes {
kCtorDefault,
kCtorInt,
kCtorInitializerList,
kCtorConstChar
};
constexpr ConstexprType() : x(kCtorDefault) {}
constexpr explicit ConstexprType(int i) : x(kCtorInt) {}
#ifndef ABSL_HAVE_NO_CONSTEXPR_INITIALIZER_LIST
constexpr ConstexprType(std::initializer_list<int> il)
: x(kCtorInitializerList) {}
#endif
constexpr ConstexprType(const char*) // NOLINT(runtime/explicit)
: x(kCtorConstChar) {}
int x;
};
struct Copyable {
Copyable() {}
Copyable(const Copyable&) {}
Copyable& operator=(const Copyable&) { return *this; }
};
struct MoveableThrow {
MoveableThrow() {}
MoveableThrow(MoveableThrow&&) {}
MoveableThrow& operator=(MoveableThrow&&) { return *this; }
};
struct MoveableNoThrow {
MoveableNoThrow() {}
MoveableNoThrow(MoveableNoThrow&&) noexcept {}
MoveableNoThrow& operator=(MoveableNoThrow&&) noexcept { return *this; }
};
struct NonMovable {
NonMovable() {}
NonMovable(const NonMovable&) = delete;
NonMovable& operator=(const NonMovable&) = delete;
NonMovable(NonMovable&&) = delete;
NonMovable& operator=(NonMovable&&) = delete;
};
TEST(optionalTest, DefaultConstructor) {
absl::optional<int> empty;
EXPECT_FALSE(empty);
constexpr absl::optional<int> cempty;
static_assert(!cempty.has_value(), "");
EXPECT_TRUE(
std::is_nothrow_default_constructible<absl::optional<int>>::value);
}
TEST(optionalTest, nulloptConstructor) {
absl::optional<int> empty(absl::nullopt);
EXPECT_FALSE(empty);
#ifdef ABSL_HAVE_STD_OPTIONAL
constexpr absl::optional<int> cempty{absl::nullopt};
#else
// Creating a temporary absl::nullopt_t object instead of using absl::nullopt
// because absl::nullopt cannot be constexpr and have external linkage at the
// same time.
constexpr absl::optional<int> cempty{absl::nullopt_t(absl::nullopt_t::init)};
#endif
static_assert(!cempty.has_value(), "");
EXPECT_TRUE((std::is_nothrow_constructible<absl::optional<int>,
absl::nullopt_t>::value));
}
TEST(optionalTest, CopyConstructor) {
{
absl::optional<int> empty, opt42 = 42;
absl::optional<int> empty_copy(empty);
EXPECT_FALSE(empty_copy);
absl::optional<int> opt42_copy(opt42);
EXPECT_TRUE(opt42_copy);
EXPECT_EQ(42, *opt42_copy);
}
{
absl::optional<const int> empty, opt42 = 42;
absl::optional<const int> empty_copy(empty);
EXPECT_FALSE(empty_copy);
absl::optional<const int> opt42_copy(opt42);
EXPECT_TRUE(opt42_copy);
EXPECT_EQ(42, *opt42_copy);
}
{
absl::optional<volatile int> empty, opt42 = 42;
absl::optional<volatile int> empty_copy(empty);
EXPECT_FALSE(empty_copy);
absl::optional<volatile int> opt42_copy(opt42);
EXPECT_TRUE(opt42_copy);
EXPECT_EQ(42, *opt42_copy);
}
// test copyablility
EXPECT_TRUE(std::is_copy_constructible<absl::optional<int>>::value);
EXPECT_TRUE(std::is_copy_constructible<absl::optional<Copyable>>::value);
EXPECT_FALSE(
std::is_copy_constructible<absl::optional<MoveableThrow>>::value);
EXPECT_FALSE(
std::is_copy_constructible<absl::optional<MoveableNoThrow>>::value);
EXPECT_FALSE(std::is_copy_constructible<absl::optional<NonMovable>>::value);
EXPECT_FALSE(
absl::is_trivially_copy_constructible<absl::optional<Copyable>>::value);
#if defined(ABSL_HAVE_STD_OPTIONAL) && defined(__GLIBCXX__)
// libstdc++ std::optional implementation (as of 7.2) has a bug: when T is
// trivially copyable, optional<T> is not trivially copyable (due to one of
// its base class is unconditionally nontrivial).
#define ABSL_GLIBCXX_OPTIONAL_TRIVIALITY_BUG 1
#endif
#ifndef ABSL_GLIBCXX_OPTIONAL_TRIVIALITY_BUG
EXPECT_TRUE(
absl::is_trivially_copy_constructible<absl::optional<int>>::value);
EXPECT_TRUE(
absl::is_trivially_copy_constructible<absl::optional<const int>>::value);
#ifndef _MSC_VER
// See defect report "Trivial copy/move constructor for class with volatile
// member" at
// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#2094
// A class with non-static data member of volatile-qualified type should still
// have a trivial copy constructor if the data member is trivial.
// Also a cv-qualified scalar type should be trivially copyable.
EXPECT_TRUE(absl::is_trivially_copy_constructible<
absl::optional<volatile int>>::value);
#endif // _MSC_VER
#endif // ABSL_GLIBCXX_OPTIONAL_TRIVIALITY_BUG
// constexpr copy constructor for trivially copyable types
{
constexpr absl::optional<int> o1;
constexpr absl::optional<int> o2 = o1;
static_assert(!o2, "");
}
{
constexpr absl::optional<int> o1 = 42;
constexpr absl::optional<int> o2 = o1;
static_assert(o2, "");
static_assert(*o2 == 42, "");
}
{
struct TrivialCopyable {
constexpr TrivialCopyable() : x(0) {}
constexpr explicit TrivialCopyable(int i) : x(i) {}
int x;
};
constexpr absl::optional<TrivialCopyable> o1(42);
constexpr absl::optional<TrivialCopyable> o2 = o1;
static_assert(o2, "");
static_assert(o2->x == 42, "");
#ifndef ABSL_GLIBCXX_OPTIONAL_TRIVIALITY_BUG
EXPECT_TRUE(absl::is_trivially_copy_constructible<
absl::optional<TrivialCopyable>>::value);
EXPECT_TRUE(absl::is_trivially_copy_constructible<
absl::optional<const TrivialCopyable>>::value);
#endif
// When testing with VS 2017 15.3, there seems to be a bug in MSVC
// std::optional when T is volatile-qualified. So skipping this test.
// Bug report:
// https://connect.microsoft.com/VisualStudio/feedback/details/3142534
#if defined(ABSL_HAVE_STD_OPTIONAL) && defined(_MSC_VER) && _MSC_VER >= 1911
#define ABSL_MSVC_OPTIONAL_VOLATILE_COPY_BUG 1
#endif
#ifndef ABSL_MSVC_OPTIONAL_VOLATILE_COPY_BUG
EXPECT_FALSE(std::is_copy_constructible<
absl::optional<volatile TrivialCopyable>>::value);
#endif
}
}
TEST(optionalTest, MoveConstructor) {
absl::optional<int> empty, opt42 = 42;
absl::optional<int> empty_move(std::move(empty));
EXPECT_FALSE(empty_move);
absl::optional<int> opt42_move(std::move(opt42));
EXPECT_TRUE(opt42_move);
EXPECT_EQ(42, opt42_move);
// test movability
EXPECT_TRUE(std::is_move_constructible<absl::optional<int>>::value);
EXPECT_TRUE(std::is_move_constructible<absl::optional<Copyable>>::value);
EXPECT_TRUE(std::is_move_constructible<absl::optional<MoveableThrow>>::value);
EXPECT_TRUE(
std::is_move_constructible<absl::optional<MoveableNoThrow>>::value);
EXPECT_FALSE(std::is_move_constructible<absl::optional<NonMovable>>::value);
// test noexcept
EXPECT_TRUE(std::is_nothrow_move_constructible<absl::optional<int>>::value);
#ifndef ABSL_HAVE_STD_OPTIONAL
EXPECT_EQ(
absl::default_allocator_is_nothrow::value,
std::is_nothrow_move_constructible<absl::optional<MoveableThrow>>::value);
#endif
EXPECT_TRUE(std::is_nothrow_move_constructible<
absl::optional<MoveableNoThrow>>::value);
}
TEST(optionalTest, Destructor) {
struct Trivial {};
struct NonTrivial {
NonTrivial(const NonTrivial&) {}
NonTrivial& operator=(const NonTrivial&) { return *this; }
~NonTrivial() {}
};
EXPECT_TRUE(std::is_trivially_destructible<absl::optional<int>>::value);
EXPECT_TRUE(std::is_trivially_destructible<absl::optional<Trivial>>::value);
EXPECT_FALSE(
std::is_trivially_destructible<absl::optional<NonTrivial>>::value);
}
TEST(optionalTest, InPlaceConstructor) {
constexpr absl::optional<ConstexprType> opt0{absl::in_place_t()};
static_assert(opt0, "");
static_assert(opt0->x == ConstexprType::kCtorDefault, "");
constexpr absl::optional<ConstexprType> opt1{absl::in_place_t(), 1};
static_assert(opt1, "");
static_assert(opt1->x == ConstexprType::kCtorInt, "");
#ifndef ABSL_HAVE_NO_CONSTEXPR_INITIALIZER_LIST
constexpr absl::optional<ConstexprType> opt2{absl::in_place_t(), {1, 2}};
static_assert(opt2, "");
static_assert(opt2->x == ConstexprType::kCtorInitializerList, "");
#endif
// TODO(absl-team): uncomment these when std::is_constructible<T, Args&&...>
// SFINAE is added to optional::optional(absl::in_place_t, Args&&...).
// struct I {
// I(absl::in_place_t);
// };
// EXPECT_FALSE((std::is_constructible<absl::optional<I>,
// absl::in_place_t>::value));
// EXPECT_FALSE((std::is_constructible<absl::optional<I>, const
// absl::in_place_t&>::value));
}
// template<U=T> optional(U&&);
TEST(optionalTest, ValueConstructor) {
constexpr absl::optional<int> opt0(0);
static_assert(opt0, "");
static_assert(*opt0 == 0, "");
EXPECT_TRUE((std::is_convertible<int, absl::optional<int>>::value));
// Copy initialization ( = "abc") won't work due to optional(optional&&)
// is not constexpr. Use list initialization instead. This invokes
// absl::optional<ConstexprType>::absl::optional<U>(U&&), with U = const char
// (&) [4], which direct-initializes the ConstexprType value held by the
// optional via ConstexprType::ConstexprType(const char*).
constexpr absl::optional<ConstexprType> opt1 = {"abc"};
static_assert(opt1, "");
static_assert(ConstexprType::kCtorConstChar == opt1->x, "");
EXPECT_TRUE(
(std::is_convertible<const char*, absl::optional<ConstexprType>>::value));
// direct initialization
constexpr absl::optional<ConstexprType> opt2{2};
static_assert(opt2, "");
static_assert(ConstexprType::kCtorInt == opt2->x, "");
EXPECT_FALSE(
(std::is_convertible<int, absl::optional<ConstexprType>>::value));
// this invokes absl::optional<int>::optional(int&&)
// NOTE: this has different behavior than assignment, e.g.
// "opt3 = {};" clears the optional rather than setting the value to 0
// According to C++17 standard N4659 [over.ics.list] 16.3.3.1.5, (9.2)- "if
// the initializer list has no elements, the implicit conversion is the
// identity conversion", so `optional(int&&)` should be a better match than
// `optional(optional&&)` which is a user-defined conversion.
// Note: GCC 7 has a bug with this overload selection when compiled with
// `-std=c++17`.
#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ == 7 && \
__cplusplus == 201703L
#define ABSL_GCC7_OVER_ICS_LIST_BUG 1
#endif
#ifndef ABSL_GCC7_OVER_ICS_LIST_BUG
constexpr absl::optional<int> opt3({});
static_assert(opt3, "");
static_assert(*opt3 == 0, "");
#endif
// this invokes the move constructor with a default constructed optional
// because non-template function is a better match than template function.
absl::optional<ConstexprType> opt4({});
EXPECT_FALSE(opt4);
}
struct Implicit {};
struct Explicit {};
struct Convert {
Convert(const Implicit&) // NOLINT(runtime/explicit)
: implicit(true), move(false) {}
Convert(Implicit&&) // NOLINT(runtime/explicit)
: implicit(true), move(true) {}
explicit Convert(const Explicit&) : implicit(false), move(false) {}
explicit Convert(Explicit&&) : implicit(false), move(true) {}
bool implicit;
bool move;
};
struct ConvertFromOptional {
ConvertFromOptional(const Implicit&) // NOLINT(runtime/explicit)
: implicit(true), move(false), from_optional(false) {}
ConvertFromOptional(Implicit&&) // NOLINT(runtime/explicit)
: implicit(true), move(true), from_optional(false) {}
ConvertFromOptional(
const absl::optional<Implicit>&) // NOLINT(runtime/explicit)
: implicit(true), move(false), from_optional(true) {}
ConvertFromOptional(absl::optional<Implicit>&&) // NOLINT(runtime/explicit)
: implicit(true), move(true), from_optional(true) {}
explicit ConvertFromOptional(const Explicit&)
: implicit(false), move(false), from_optional(false) {}
explicit ConvertFromOptional(Explicit&&)
: implicit(false), move(true), from_optional(false) {}
explicit ConvertFromOptional(const absl::optional<Explicit>&)
: implicit(false), move(false), from_optional(true) {}
explicit ConvertFromOptional(absl::optional<Explicit>&&)
: implicit(false), move(true), from_optional(true) {}
bool implicit;
bool move;
bool from_optional;
};
TEST(optionalTest, ConvertingConstructor) {
absl::optional<Implicit> i_empty;
absl::optional<Implicit> i(absl::in_place);
absl::optional<Explicit> e_empty;
absl::optional<Explicit> e(absl::in_place);
{
// implicitly constructing absl::optional<Convert> from
// absl::optional<Implicit>
absl::optional<Convert> empty = i_empty;
EXPECT_FALSE(empty);
absl::optional<Convert> opt_copy = i;
EXPECT_TRUE(opt_copy);
EXPECT_TRUE(opt_copy->implicit);
EXPECT_FALSE(opt_copy->move);
absl::optional<Convert> opt_move = absl::optional<Implicit>(absl::in_place);
EXPECT_TRUE(opt_move);
EXPECT_TRUE(opt_move->implicit);
EXPECT_TRUE(opt_move->move);
}
{
// explicitly constructing absl::optional<Convert> from
// absl::optional<Explicit>
absl::optional<Convert> empty(e_empty);
EXPECT_FALSE(empty);
absl::optional<Convert> opt_copy(e);
EXPECT_TRUE(opt_copy);
EXPECT_FALSE(opt_copy->implicit);
EXPECT_FALSE(opt_copy->move);
EXPECT_FALSE((std::is_convertible<const absl::optional<Explicit>&,
absl::optional<Convert>>::value));
absl::optional<Convert> opt_move{absl::optional<Explicit>(absl::in_place)};
EXPECT_TRUE(opt_move);
EXPECT_FALSE(opt_move->implicit);
EXPECT_TRUE(opt_move->move);
EXPECT_FALSE((std::is_convertible<absl::optional<Explicit>&&,
absl::optional<Convert>>::value));
}
{
// implicitly constructing absl::optional<ConvertFromOptional> from
// absl::optional<Implicit> via
// ConvertFromOptional(absl::optional<Implicit>&&) check that
// ConvertFromOptional(Implicit&&) is NOT called
static_assert(
std::is_convertible<absl::optional<Implicit>,
absl::optional<ConvertFromOptional>>::value,
"");
absl::optional<ConvertFromOptional> opt0 = i_empty;
EXPECT_TRUE(opt0);
EXPECT_TRUE(opt0->implicit);
EXPECT_FALSE(opt0->move);
EXPECT_TRUE(opt0->from_optional);
absl::optional<ConvertFromOptional> opt1 = absl::optional<Implicit>();
EXPECT_TRUE(opt1);
EXPECT_TRUE(opt1->implicit);
EXPECT_TRUE(opt1->move);
EXPECT_TRUE(opt1->from_optional);
}
{
// implicitly constructing absl::optional<ConvertFromOptional> from
// absl::optional<Explicit> via
// ConvertFromOptional(absl::optional<Explicit>&&) check that
// ConvertFromOptional(Explicit&&) is NOT called
absl::optional<ConvertFromOptional> opt0(e_empty);
EXPECT_TRUE(opt0);
EXPECT_FALSE(opt0->implicit);
EXPECT_FALSE(opt0->move);
EXPECT_TRUE(opt0->from_optional);
EXPECT_FALSE(
(std::is_convertible<const absl::optional<Explicit>&,
absl::optional<ConvertFromOptional>>::value));
absl::optional<ConvertFromOptional> opt1{absl::optional<Explicit>()};
EXPECT_TRUE(opt1);
EXPECT_FALSE(opt1->implicit);
EXPECT_TRUE(opt1->move);
EXPECT_TRUE(opt1->from_optional);
EXPECT_FALSE(
(std::is_convertible<absl::optional<Explicit>&&,
absl::optional<ConvertFromOptional>>::value));
}
}
TEST(optionalTest, StructorBasic) {
StructorListener listener;
Listenable::listener = &listener;
{
absl::optional<Listenable> empty;
EXPECT_FALSE(empty);
absl::optional<Listenable> opt0(absl::in_place);
EXPECT_TRUE(opt0);
absl::optional<Listenable> opt1(absl::in_place, 1);
EXPECT_TRUE(opt1);
absl::optional<Listenable> opt2(absl::in_place, 1, 2);
EXPECT_TRUE(opt2);
}
EXPECT_EQ(1, listener.construct0);
EXPECT_EQ(1, listener.construct1);
EXPECT_EQ(1, listener.construct2);
EXPECT_EQ(3, listener.destruct);
}
TEST(optionalTest, CopyMoveStructor) {
StructorListener listener;
Listenable::listener = &listener;
absl::optional<Listenable> original(absl::in_place);
EXPECT_EQ(1, listener.construct0);
EXPECT_EQ(0, listener.copy);
EXPECT_EQ(0, listener.move);
absl::optional<Listenable> copy(original);
EXPECT_EQ(1, listener.construct0);
EXPECT_EQ(1, listener.copy);
EXPECT_EQ(0, listener.move);
absl::optional<Listenable> move(std::move(original));
EXPECT_EQ(1, listener.construct0);
EXPECT_EQ(1, listener.copy);
EXPECT_EQ(1, listener.move);
}
TEST(optionalTest, ListInit) {
StructorListener listener;
Listenable::listener = &listener;
absl::optional<Listenable> listinit1(absl::in_place, {1});
absl::optional<Listenable> listinit2(absl::in_place, {1, 2});
EXPECT_EQ(2, listener.listinit);
}
TEST(optionalTest, AssignFromNullopt) {
absl::optional<int> opt(1);
opt = absl::nullopt;
EXPECT_FALSE(opt);
StructorListener listener;
Listenable::listener = &listener;
absl::optional<Listenable> opt1(absl::in_place);
opt1 = absl::nullopt;
EXPECT_FALSE(opt1);
EXPECT_EQ(1, listener.construct0);
EXPECT_EQ(1, listener.destruct);
EXPECT_TRUE((
std::is_nothrow_assignable<absl::optional<int>, absl::nullopt_t>::value));
EXPECT_TRUE((std::is_nothrow_assignable<absl::optional<Listenable>,
absl::nullopt_t>::value));
}
TEST(optionalTest, CopyAssignment) {
const absl::optional<int> empty, opt1 = 1, opt2 = 2;
absl::optional<int> empty_to_opt1, opt1_to_opt2, opt2_to_empty;
EXPECT_FALSE(empty_to_opt1);
empty_to_opt1 = empty;
EXPECT_FALSE(empty_to_opt1);
empty_to_opt1 = opt1;
EXPECT_TRUE(empty_to_opt1);
EXPECT_EQ(1, empty_to_opt1.value());
EXPECT_FALSE(opt1_to_opt2);
opt1_to_opt2 = opt1;
EXPECT_TRUE(opt1_to_opt2);
EXPECT_EQ(1, opt1_to_opt2.value());
opt1_to_opt2 = opt2;
EXPECT_TRUE(opt1_to_opt2);
EXPECT_EQ(2, opt1_to_opt2.value());
EXPECT_FALSE(opt2_to_empty);
opt2_to_empty = opt2;
EXPECT_TRUE(opt2_to_empty);
EXPECT_EQ(2, opt2_to_empty.value());
opt2_to_empty = empty;
EXPECT_FALSE(opt2_to_empty);
EXPECT_FALSE(std::is_copy_assignable<absl::optional<const int>>::value);
EXPECT_TRUE(std::is_copy_assignable<absl::optional<Copyable>>::value);
EXPECT_FALSE(std::is_copy_assignable<absl::optional<MoveableThrow>>::value);
EXPECT_FALSE(std::is_copy_assignable<absl::optional<MoveableNoThrow>>::value);
EXPECT_FALSE(std::is_copy_assignable<absl::optional<NonMovable>>::value);
EXPECT_TRUE(absl::is_trivially_copy_assignable<int>::value);
EXPECT_TRUE(absl::is_trivially_copy_assignable<volatile int>::value);
struct Trivial {
int i;
};
struct NonTrivial {
NonTrivial& operator=(const NonTrivial&) { return *this; }
int i;
};
EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial>::value);
EXPECT_FALSE(std::is_copy_assignable<const Trivial>::value);
EXPECT_FALSE(std::is_copy_assignable<volatile Trivial>::value);
EXPECT_TRUE(std::is_copy_assignable<NonTrivial>::value);
EXPECT_FALSE(absl::is_trivially_copy_assignable<NonTrivial>::value);
// std::optional doesn't support volatile nontrivial types.
#ifndef ABSL_HAVE_STD_OPTIONAL
{
StructorListener listener;
Listenable::listener = &listener;
absl::optional<volatile Listenable> empty, set(absl::in_place);
EXPECT_EQ(1, listener.construct0);
absl::optional<volatile Listenable> empty_to_empty, empty_to_set,
set_to_empty(absl::in_place), set_to_set(absl::in_place);
EXPECT_EQ(3, listener.construct0);
empty_to_empty = empty; // no effect
empty_to_set = set; // copy construct
set_to_empty = empty; // destruct
set_to_set = set; // copy assign
EXPECT_EQ(1, listener.volatile_copy);
EXPECT_EQ(0, listener.volatile_move);
EXPECT_EQ(1, listener.destruct);
EXPECT_EQ(1, listener.volatile_copy_assign);
}
#endif // ABSL_HAVE_STD_OPTIONAL
}
TEST(optionalTest, MoveAssignment) {
{
StructorListener listener;
Listenable::listener = &listener;
absl::optional<Listenable> empty1, empty2, set1(absl::in_place),
set2(absl::in_place);
EXPECT_EQ(2, listener.construct0);
absl::optional<Listenable> empty_to_empty, empty_to_set,
set_to_empty(absl::in_place), set_to_set(absl::in_place);
EXPECT_EQ(4, listener.construct0);
empty_to_empty = std::move(empty1);
empty_to_set = std::move(set1);
set_to_empty = std::move(empty2);
set_to_set = std::move(set2);
EXPECT_EQ(0, listener.copy);
EXPECT_EQ(1, listener.move);
EXPECT_EQ(1, listener.destruct);
EXPECT_EQ(1, listener.move_assign);
}
// std::optional doesn't support volatile nontrivial types.
#ifndef ABSL_HAVE_STD_OPTIONAL
{
StructorListener listener;
Listenable::listener = &listener;
absl::optional<volatile Listenable> empty1, empty2, set1(absl::in_place),
set2(absl::in_place);
EXPECT_EQ(2, listener.construct0);
absl::optional<volatile Listenable> empty_to_empty, empty_to_set,
set_to_empty(absl::in_place), set_to_set(absl::in_place);
EXPECT_EQ(4, listener.construct0);
empty_to_empty = std::move(empty1); // no effect
empty_to_set = std::move(set1); // move construct
set_to_empty = std::move(empty2); // destruct
set_to_set = std::move(set2); // move assign
EXPECT_EQ(0, listener.volatile_copy);
EXPECT_EQ(1, listener.volatile_move);
EXPECT_EQ(1, listener.destruct);
EXPECT_EQ(1, listener.volatile_move_assign);
}
#endif // ABSL_HAVE_STD_OPTIONAL
EXPECT_FALSE(std::is_move_assignable<absl::optional<const int>>::value);
EXPECT_TRUE(std::is_move_assignable<absl::optional<Copyable>>::value);
EXPECT_TRUE(std::is_move_assignable<absl::optional<MoveableThrow>>::value);
EXPECT_TRUE(std::is_move_assignable<absl::optional<MoveableNoThrow>>::value);
EXPECT_FALSE(std::is_move_assignable<absl::optional<NonMovable>>::value);
EXPECT_FALSE(
std::is_nothrow_move_assignable<absl::optional<MoveableThrow>>::value);
EXPECT_TRUE(
std::is_nothrow_move_assignable<absl::optional<MoveableNoThrow>>::value);
}
struct NoConvertToOptional {
// disable implicit conversion from const NoConvertToOptional&
// to absl::optional<NoConvertToOptional>.
NoConvertToOptional(const NoConvertToOptional&) = delete;
};
struct CopyConvert {
CopyConvert(const NoConvertToOptional&);
CopyConvert& operator=(const CopyConvert&) = delete;
CopyConvert& operator=(const NoConvertToOptional&);
};
struct CopyConvertFromOptional {
CopyConvertFromOptional(const NoConvertToOptional&);
CopyConvertFromOptional(const absl::optional<NoConvertToOptional>&);
CopyConvertFromOptional& operator=(const CopyConvertFromOptional&) = delete;
CopyConvertFromOptional& operator=(const NoConvertToOptional&);
CopyConvertFromOptional& operator=(
const absl::optional<NoConvertToOptional>&);
};
struct MoveConvert {
MoveConvert(NoConvertToOptional&&);
MoveConvert& operator=(const MoveConvert&) = delete;
MoveConvert& operator=(NoConvertToOptional&&);
};
struct MoveConvertFromOptional {
MoveConvertFromOptional(NoConvertToOptional&&);
MoveConvertFromOptional(absl::optional<NoConvertToOptional>&&);
MoveConvertFromOptional& operator=(const MoveConvertFromOptional&) = delete;
MoveConvertFromOptional& operator=(NoConvertToOptional&&);
MoveConvertFromOptional& operator=(absl::optional<NoConvertToOptional>&&);
};
// template <typename U = T> absl::optional<T>& operator=(U&& v);
TEST(optionalTest, ValueAssignment) {
absl::optional<int> opt;
EXPECT_FALSE(opt);
opt = 42;
EXPECT_TRUE(opt);
EXPECT_EQ(42, opt.value());
opt = absl::nullopt;
EXPECT_FALSE(opt);
opt = 42;
EXPECT_TRUE(opt);
EXPECT_EQ(42, opt.value());
opt = 43;
EXPECT_TRUE(opt);
EXPECT_EQ(43, opt.value());
opt = {}; // this should clear optional
EXPECT_FALSE(opt);
opt = {44};
EXPECT_TRUE(opt);
EXPECT_EQ(44, opt.value());
// U = const NoConvertToOptional&
EXPECT_TRUE((std::is_assignable<absl::optional<CopyConvert>&,
const NoConvertToOptional&>::value));
// U = const absl::optional<NoConvertToOptional>&
EXPECT_TRUE((std::is_assignable<absl::optional<CopyConvertFromOptional>&,
const NoConvertToOptional&>::value));
// U = const NoConvertToOptional& triggers SFINAE because
// std::is_constructible_v<MoveConvert, const NoConvertToOptional&> is false
EXPECT_FALSE((std::is_assignable<absl::optional<MoveConvert>&,
const NoConvertToOptional&>::value));
// U = NoConvertToOptional
EXPECT_TRUE((std::is_assignable<absl::optional<MoveConvert>&,
NoConvertToOptional&&>::value));
// U = const NoConvertToOptional& triggers SFINAE because
// std::is_constructible_v<MoveConvertFromOptional, const
// NoConvertToOptional&> is false
EXPECT_FALSE((std::is_assignable<absl::optional<MoveConvertFromOptional>&,
const NoConvertToOptional&>::value));
// U = NoConvertToOptional
EXPECT_TRUE((std::is_assignable<absl::optional<MoveConvertFromOptional>&,
NoConvertToOptional&&>::value));
// U = const absl::optional<NoConvertToOptional>&
EXPECT_TRUE(
(std::is_assignable<absl::optional<CopyConvertFromOptional>&,
const absl::optional<NoConvertToOptional>&>::value));
// U = absl::optional<NoConvertToOptional>
EXPECT_TRUE(
(std::is_assignable<absl::optional<MoveConvertFromOptional>&,
absl::optional<NoConvertToOptional>&&>::value));
}
// template <typename U> absl::optional<T>& operator=(const absl::optional<U>&
// rhs); template <typename U> absl::optional<T>& operator=(absl::optional<U>&&
// rhs);
TEST(optionalTest, ConvertingAssignment) {
absl::optional<int> opt_i;
absl::optional<char> opt_c('c');
opt_i = opt_c;
EXPECT_TRUE(opt_i);
EXPECT_EQ(*opt_c, *opt_i);
opt_i = absl::optional<char>();
EXPECT_FALSE(opt_i);
opt_i = absl::optional<char>('d');
EXPECT_TRUE(opt_i);
EXPECT_EQ('d', *opt_i);
absl::optional<std::string> opt_str;
absl::optional<const char*> opt_cstr("abc");
opt_str = opt_cstr;
EXPECT_TRUE(opt_str);
EXPECT_EQ(std::string("abc"), *opt_str);
opt_str = absl::optional<const char*>();
EXPECT_FALSE(opt_str);
opt_str = absl::optional<const char*>("def");
EXPECT_TRUE(opt_str);
EXPECT_EQ(std::string("def"), *opt_str);
// operator=(const absl::optional<U>&) with U = NoConvertToOptional
EXPECT_TRUE(
(std::is_assignable<absl::optional<CopyConvert>,
const absl::optional<NoConvertToOptional>&>::value));
// operator=(const absl::optional<U>&) with U = NoConvertToOptional
// triggers SFINAE because
// std::is_constructible_v<MoveConvert, const NoConvertToOptional&> is false
EXPECT_FALSE(
(std::is_assignable<absl::optional<MoveConvert>&,
const absl::optional<NoConvertToOptional>&>::value));
// operator=(absl::optional<U>&&) with U = NoConvertToOptional
EXPECT_TRUE(
(std::is_assignable<absl::optional<MoveConvert>&,
absl::optional<NoConvertToOptional>&&>::value));
// operator=(const absl::optional<U>&) with U = NoConvertToOptional triggers
// SFINAE because std::is_constructible_v<MoveConvertFromOptional, const
// NoConvertToOptional&> is false. operator=(U&&) with U = const
// absl::optional<NoConverToOptional>& triggers SFINAE because
// std::is_constructible<MoveConvertFromOptional,
// absl::optional<NoConvertToOptional>&&> is true.
EXPECT_FALSE(
(std::is_assignable<absl::optional<MoveConvertFromOptional>&,
const absl::optional<NoConvertToOptional>&>::value));
}
TEST(optionalTest, ResetAndHasValue) {
StructorListener listener;
Listenable::listener = &listener;
absl::optional<Listenable> opt;
EXPECT_FALSE(opt);
EXPECT_FALSE(opt.has_value());
opt.emplace();
EXPECT_TRUE(opt);
EXPECT_TRUE(opt.has_value());
opt.reset();
EXPECT_FALSE(opt);
EXPECT_FALSE(opt.has_value());
EXPECT_EQ(1, listener.destruct);
opt.reset();
EXPECT_FALSE(opt);
EXPECT_FALSE(opt.has_value());
constexpr absl::optional<int> empty;
static_assert(!empty.has_value(), "");
constexpr absl::optional<int> nonempty(1);
static_assert(nonempty.has_value(), "");
}
TEST(optionalTest, Emplace) {
StructorListener listener;
Listenable::listener = &listener;
absl::optional<Listenable> opt;
EXPECT_FALSE(opt);
opt.emplace(1);
EXPECT_TRUE(opt);
opt.emplace(1, 2);
EXPECT_EQ(1, listener.construct1);
EXPECT_EQ(1, listener.construct2);
EXPECT_EQ(1, listener.destruct);
absl::optional<std::string> o;
EXPECT_TRUE((std::is_same<std::string&, decltype(o.emplace("abc"))>::value));
std::string& ref = o.emplace("abc");
EXPECT_EQ(&ref, &o.value());
}
TEST(optionalTest, ListEmplace) {
StructorListener listener;
Listenable::listener = &listener;
absl::optional<Listenable> opt;
EXPECT_FALSE(opt);
opt.emplace({1});
EXPECT_TRUE(opt);
opt.emplace({1, 2});
EXPECT_EQ(2, listener.listinit);
EXPECT_EQ(1, listener.destruct);
absl::optional<Listenable> o;
EXPECT_TRUE((std::is_same<Listenable&, decltype(o.emplace({1}))>::value));
Listenable& ref = o.emplace({1});
EXPECT_EQ(&ref, &o.value());
}
TEST(optionalTest, Swap) {
absl::optional<int> opt_empty, opt1 = 1, opt2 = 2;
EXPECT_FALSE(opt_empty);
EXPECT_TRUE(opt1);
EXPECT_EQ(1, opt1.value());
EXPECT_TRUE(opt2);
EXPECT_EQ(2, opt2.value());
swap(opt_empty, opt1);
EXPECT_FALSE(opt1);
EXPECT_TRUE(opt_empty);
EXPECT_EQ(1, opt_empty.value());
EXPECT_TRUE(opt2);
EXPECT_EQ(2, opt2.value());
swap(opt_empty, opt1);
EXPECT_FALSE(opt_empty);
EXPECT_TRUE(opt1);
EXPECT_EQ(1, opt1.value());
EXPECT_TRUE(opt2);
EXPECT_EQ(2, opt2.value());
swap(opt1, opt2);
EXPECT_FALSE(opt_empty);
EXPECT_TRUE(opt1);
EXPECT_EQ(2, opt1.value());
EXPECT_TRUE(opt2);
EXPECT_EQ(1, opt2.value());
EXPECT_TRUE(noexcept(opt1.swap(opt2)));
EXPECT_TRUE(noexcept(swap(opt1, opt2)));
}
TEST(optionalTest, PointerStuff) {
absl::optional<std::string> opt(absl::in_place, "foo");
EXPECT_EQ("foo", *opt);
const auto& opt_const = opt;
EXPECT_EQ("foo", *opt_const);
EXPECT_EQ(opt->size(), 3);
EXPECT_EQ(opt_const->size(), 3);
constexpr absl::optional<ConstexprType> opt1(1);
static_assert(opt1->x == ConstexprType::kCtorInt, "");
}
// gcc has a bug pre 4.9.1 where it doesn't do correct overload resolution
// when overloads are const-qualified and *this is an raluve.
// Skip that test to make the build green again when using the old compiler.
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59296 is fixed in 4.9.1.
#if defined(__GNUC__) && !defined(__clang__)
#define GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
#if GCC_VERSION < 40901
#define ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG
#endif
#endif
// MSVC has a bug with "cv-qualifiers in class construction", fixed in 2017. See
// https://docs.microsoft.com/en-us/cpp/cpp-conformance-improvements-2017#bug-fixes
// The compiler some incorrectly ingores the cv-qualifier when generating a
// class object via a constructor call. For example:
//
// class optional {
// constexpr T&& value() &&;
// constexpr const T&& value() const &&;
// }
//
// using COI = const absl::optional<int>;
// static_assert(2 == COI(2).value(), ""); // const &&
//
// This should invoke the "const &&" overload but since it ignores the const
// qualifier it finds the "&&" overload the best candidate.
#if defined(_MSC_VER) && _MSC_VER < 1910
#define ABSL_SKIP_OVERLOAD_TEST_DUE_TO_MSVC_BUG
#endif
TEST(optionalTest, Value) {
using O = absl::optional<std::string>;
using CO = const absl::optional<std::string>;
using OC = absl::optional<const std::string>;
O lvalue(absl::in_place, "lvalue");
CO clvalue(absl::in_place, "clvalue");
OC lvalue_c(absl::in_place, "lvalue_c");
EXPECT_EQ("lvalue", lvalue.value());
EXPECT_EQ("clvalue", clvalue.value());
EXPECT_EQ("lvalue_c", lvalue_c.value());
EXPECT_EQ("xvalue", O(absl::in_place, "xvalue").value());
EXPECT_EQ("xvalue_c", OC(absl::in_place, "xvalue_c").value());
#ifndef ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG
EXPECT_EQ("cxvalue", CO(absl::in_place, "cxvalue").value());
#endif
EXPECT_EQ("&", TypeQuals(lvalue.value()));
EXPECT_EQ("c&", TypeQuals(clvalue.value()));
EXPECT_EQ("c&", TypeQuals(lvalue_c.value()));
EXPECT_EQ("&&", TypeQuals(O(absl::in_place, "xvalue").value()));
#if !defined(ABSL_SKIP_OVERLOAD_TEST_DUE_TO_MSVC_BUG) && \