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abseil-cpp/absl/functional/any_invocable_test.cc

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// Copyright 2022 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/functional/any_invocable.h"
#include <cstddef>
#include <initializer_list>
#include <memory>
#include <numeric>
#include <type_traits>
#include "gtest/gtest.h"
#include "absl/base/config.h"
#include "absl/meta/type_traits.h"
#include "absl/utility/utility.h"
static_assert(absl::internal_any_invocable::kStorageSize >= sizeof(void*),
"These tests assume that the small object storage is at least "
"the size of a pointer.");
namespace {
// Helper macro used to avoid spelling `noexcept` in language versions older
// than C++17, where it is not part of the type system, in order to avoid
// compilation failures and internal compiler errors.
#if ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L
#define ABSL_INTERNAL_NOEXCEPT_SPEC(noex) noexcept(noex)
#else
#define ABSL_INTERNAL_NOEXCEPT_SPEC(noex)
#endif
// A dummy type we use when passing qualifiers to metafunctions
struct _ {};
template <class T>
struct Wrapper {
template <class U,
class = absl::enable_if_t<std::is_convertible<U, T>::value>>
Wrapper(U&&); // NOLINT
};
// This will cause a recursive trait instantiation if the SFINAE checks are
// not ordered correctly for constructibility.
static_assert(std::is_constructible<Wrapper<absl::AnyInvocable<void()>>,
Wrapper<absl::AnyInvocable<void()>>>::value,
"");
// A metafunction that takes the cv and l-value reference qualifiers that were
// associated with a function type (here passed via qualifiers of an object
// type), and .
template <class Qualifiers, class This>
struct QualifiersForThisImpl {
static_assert(std::is_object<This>::value, "");
using type =
absl::conditional_t<std::is_const<Qualifiers>::value, const This, This>&;
};
template <class Qualifiers, class This>
struct QualifiersForThisImpl<Qualifiers&, This>
: QualifiersForThisImpl<Qualifiers, This> {};
template <class Qualifiers, class This>
struct QualifiersForThisImpl<Qualifiers&&, This> {
static_assert(std::is_object<This>::value, "");
using type =
absl::conditional_t<std::is_const<Qualifiers>::value, const This, This>&&;
};
template <class Qualifiers, class This>
using QualifiersForThis =
typename QualifiersForThisImpl<Qualifiers, This>::type;
// A metafunction that takes the cv and l-value reference qualifier of T and
// applies them to U's function type qualifiers.
template <class T, class Fun>
struct GiveQualifiersToFunImpl;
template <class T, class R, class... P>
struct GiveQualifiersToFunImpl<T, R(P...)> {
using type =
absl::conditional_t<std::is_const<T>::value, R(P...) const, R(P...)>;
};
template <class T, class R, class... P>
struct GiveQualifiersToFunImpl<T&, R(P...)> {
using type =
absl::conditional_t<std::is_const<T>::value, R(P...) const&, R(P...)&>;
};
template <class T, class R, class... P>
struct GiveQualifiersToFunImpl<T&&, R(P...)> {
using type =
absl::conditional_t<std::is_const<T>::value, R(P...) const&&, R(P...) &&>;
};
// If noexcept is a part of the type system, then provide the noexcept forms.
#if defined(__cpp_noexcept_function_type)
template <class T, class R, class... P>
struct GiveQualifiersToFunImpl<T, R(P...) noexcept> {
using type = absl::conditional_t<std::is_const<T>::value,
R(P...) const noexcept, R(P...) noexcept>;
};
template <class T, class R, class... P>
struct GiveQualifiersToFunImpl<T&, R(P...) noexcept> {
using type =
absl::conditional_t<std::is_const<T>::value, R(P...) const & noexcept,
R(P...) & noexcept>;
};
template <class T, class R, class... P>
struct GiveQualifiersToFunImpl<T&&, R(P...) noexcept> {
using type =
absl::conditional_t<std::is_const<T>::value, R(P...) const && noexcept,
R(P...) && noexcept>;
};
#endif // defined(__cpp_noexcept_function_type)
template <class T, class Fun>
using GiveQualifiersToFun = typename GiveQualifiersToFunImpl<T, Fun>::type;
// This is used in template parameters to decide whether or not to use a type
// that fits in the small object optimization storage.
enum class ObjSize { small, large };
// A base type that is used with classes as a means to insert an
// appropriately-sized dummy datamember when Size is ObjSize::large so that the
// user's class type is guaranteed to not fit in small object storage.
template <ObjSize Size>
struct TypeErasedPadding;
template <>
struct TypeErasedPadding<ObjSize::small> {};
template <>
struct TypeErasedPadding<ObjSize::large> {
char dummy_data[absl::internal_any_invocable::kStorageSize + 1] = {};
};
struct Int {
Int(int v) noexcept : value(v) {} // NOLINT
#ifndef _MSC_VER
Int(Int&&) noexcept {
// NOTE: Prior to C++17, this not being called requires optimizations to
// take place when performing the top-level invocation. In practice,
// most supported compilers perform this optimization prior to C++17.
std::abort();
}
#else
Int(Int&& v) noexcept = default;
#endif
operator int() && noexcept { return value; } // NOLINT
int MemberFunctionAdd(int const& b, int c) noexcept { // NOLINT
return value + b + c;
}
int value;
};
enum class Movable { no, yes, nothrow, trivial };
enum class NothrowCall { no, yes };
enum class Destructible { nothrow, trivial };
enum class ObjAlign : std::size_t {
normal = absl::internal_any_invocable::kAlignment,
large = absl::internal_any_invocable::kAlignment * 2,
};
// A function-object template that has knobs for each property that can affect
// how the object is stored in AnyInvocable.
template <Movable Movability, Destructible Destructibility, class Qual,
NothrowCall CallExceptionSpec, ObjSize Size, ObjAlign Alignment>
struct add;
#define ABSL_INTERNALS_ADD(qual) \
template <NothrowCall CallExceptionSpec, ObjSize Size, ObjAlign Alignment> \
struct alignas(static_cast<std::size_t>(Alignment)) \
add<Movable::trivial, Destructible::trivial, _ qual, CallExceptionSpec, \
Size, Alignment> : TypeErasedPadding<Size> { \
explicit add(int state_init) : state(state_init) {} \
explicit add(std::initializer_list<int> state_init, int tail) \
: state(std::accumulate(std::begin(state_init), std::end(state_init), \
0) + \
tail) {} \
add(add&& other) = default; /*NOLINT*/ \
Int operator()(int a, int b, int c) qual \
ABSL_INTERNAL_NOEXCEPT_SPEC(CallExceptionSpec == NothrowCall::yes) { \
return state + a + b + c; \
} \
int state; \
}; \
\
template <NothrowCall CallExceptionSpec, ObjSize Size, ObjAlign Alignment> \
struct alignas(static_cast<std::size_t>(Alignment)) \
add<Movable::trivial, Destructible::nothrow, _ qual, CallExceptionSpec, \
Size, Alignment> : TypeErasedPadding<Size> { \
explicit add(int state_init) : state(state_init) {} \
explicit add(std::initializer_list<int> state_init, int tail) \
: state(std::accumulate(std::begin(state_init), std::end(state_init), \
0) + \
tail) {} \
~add() noexcept {} \
add(add&& other) = default; /*NOLINT*/ \
Int operator()(int a, int b, int c) qual \
ABSL_INTERNAL_NOEXCEPT_SPEC(CallExceptionSpec == NothrowCall::yes) { \
return state + a + b + c; \
} \
int state; \
}
// Explicitly specify an empty argument.
// MSVC (at least up to _MSC_VER 1931, if not beyond) warns that
// ABSL_INTERNALS_ADD() is an undefined zero-arg overload.
#define ABSL_INTERNALS_NOARG
ABSL_INTERNALS_ADD(ABSL_INTERNALS_NOARG);
#undef ABSL_INTERNALS_NOARG
ABSL_INTERNALS_ADD(const);
ABSL_INTERNALS_ADD(&);
ABSL_INTERNALS_ADD(const&);
ABSL_INTERNALS_ADD(&&); // NOLINT
ABSL_INTERNALS_ADD(const&&); // NOLINT
#undef ABSL_INTERNALS_ADD
template <Destructible Destructibility, class Qual,
NothrowCall CallExceptionSpec, ObjSize Size, ObjAlign Alignment>
struct add<Movable::no, Destructibility, Qual, CallExceptionSpec, Size,
Alignment> : private add<Movable::trivial, Destructibility, Qual,
CallExceptionSpec, Size, Alignment> {
using Base = add<Movable::trivial, Destructibility, Qual, CallExceptionSpec,
Size, Alignment>;
explicit add(int state_init) : Base(state_init) {}
explicit add(std::initializer_list<int> state_init, int tail)
: Base(state_init, tail) {}
add(add&&) = delete;
using Base::operator();
using Base::state;
};
template <Destructible Destructibility, class Qual,
NothrowCall CallExceptionSpec, ObjSize Size, ObjAlign Alignment>
struct add<Movable::yes, Destructibility, Qual, CallExceptionSpec, Size,
Alignment> : private add<Movable::trivial, Destructibility, Qual,
CallExceptionSpec, Size, Alignment> {
using Base = add<Movable::trivial, Destructibility, Qual, CallExceptionSpec,
Size, Alignment>;
explicit add(int state_init) : Base(state_init) {}
explicit add(std::initializer_list<int> state_init, int tail)
: Base(state_init, tail) {}
add(add&& other) noexcept(false) : Base(other.state) {} // NOLINT
using Base::operator();
using Base::state;
};
template <Destructible Destructibility, class Qual,
NothrowCall CallExceptionSpec, ObjSize Size, ObjAlign Alignment>
struct add<Movable::nothrow, Destructibility, Qual, CallExceptionSpec, Size,
Alignment> : private add<Movable::trivial, Destructibility, Qual,
CallExceptionSpec, Size, Alignment> {
using Base = add<Movable::trivial, Destructibility, Qual, CallExceptionSpec,
Size, Alignment>;
explicit add(int state_init) : Base(state_init) {}
explicit add(std::initializer_list<int> state_init, int tail)
: Base(state_init, tail) {}
add(add&& other) noexcept : Base(other.state) {}
using Base::operator();
using Base::state;
};
// Actual non-member functions rather than function objects
Int add_function(Int&& a, int b, int c) noexcept { return a.value + b + c; }
Int mult_function(Int&& a, int b, int c) noexcept { return a.value * b * c; }
Int square_function(Int const&& a) noexcept { return a.value * a.value; }
template <class Sig>
using AnyInvocable = absl::AnyInvocable<Sig>;
// Instantiations of this template contains all of the compile-time parameters
// for a given instantiation of the AnyInvocable test suite.
template <Movable Movability, Destructible Destructibility, class Qual,
NothrowCall CallExceptionSpec, ObjSize Size, ObjAlign Alignment>
struct TestParams {
static constexpr Movable kMovability = Movability;
static constexpr Destructible kDestructibility = Destructibility;
using Qualifiers = Qual;
static constexpr NothrowCall kCallExceptionSpec = CallExceptionSpec;
static constexpr bool kIsNoexcept = kCallExceptionSpec == NothrowCall::yes;
static constexpr bool kIsRvalueQualified =
std::is_rvalue_reference<Qual>::value;
static constexpr ObjSize kSize = Size;
static constexpr ObjAlign kAlignment = Alignment;
// These types are used when testing with member object pointer Invocables
using UnqualifiedUnaryFunType = int(Int const&&)
ABSL_INTERNAL_NOEXCEPT_SPEC(CallExceptionSpec == NothrowCall::yes);
using UnaryFunType = GiveQualifiersToFun<Qualifiers, UnqualifiedUnaryFunType>;
using MemObjPtrType = int(Int::*);
using UnaryAnyInvType = AnyInvocable<UnaryFunType>;
using UnaryThisParamType = QualifiersForThis<Qualifiers, UnaryAnyInvType>;
template <class T>
static UnaryThisParamType ToUnaryThisParam(T&& fun) {
return static_cast<UnaryThisParamType>(fun);
}
// This function type intentionally uses 3 "kinds" of parameter types.
// - A user-defined type
// - A reference type
// - A scalar type
//
// These were chosen because internal forwarding takes place on parameters
// differently depending based on type properties (scalars are forwarded by
// value).
using ResultType = Int;
using AnyInvocableFunTypeNotNoexcept = Int(Int, const int&, int);
using UnqualifiedFunType =
typename std::conditional<kIsNoexcept, Int(Int, const int&, int) noexcept,
Int(Int, const int&, int)>::type;
using FunType = GiveQualifiersToFun<Qualifiers, UnqualifiedFunType>;
using MemFunPtrType =
typename std::conditional<kIsNoexcept,
Int (Int::*)(const int&, int) noexcept,
Int (Int::*)(const int&, int)>::type;
using AnyInvType = AnyInvocable<FunType>;
using AddType = add<kMovability, kDestructibility, Qualifiers,
kCallExceptionSpec, kSize, kAlignment>;
using ThisParamType = QualifiersForThis<Qualifiers, AnyInvType>;
template <class T>
static ThisParamType ToThisParam(T&& fun) {
return static_cast<ThisParamType>(fun);
}
// These typedefs are used when testing void return type covariance.
using UnqualifiedVoidFunType =
typename std::conditional<kIsNoexcept,
void(Int, const int&, int) noexcept,
void(Int, const int&, int)>::type;
using VoidFunType = GiveQualifiersToFun<Qualifiers, UnqualifiedVoidFunType>;
using VoidAnyInvType = AnyInvocable<VoidFunType>;
using VoidThisParamType = QualifiersForThis<Qualifiers, VoidAnyInvType>;
template <class T>
static VoidThisParamType ToVoidThisParam(T&& fun) {
return static_cast<VoidThisParamType>(fun);
}
using CompatibleAnyInvocableFunType =
absl::conditional_t<std::is_rvalue_reference<Qual>::value,
GiveQualifiersToFun<const _&&, UnqualifiedFunType>,
GiveQualifiersToFun<const _&, UnqualifiedFunType>>;
using CompatibleAnyInvType = AnyInvocable<CompatibleAnyInvocableFunType>;
using IncompatibleInvocable =
absl::conditional_t<std::is_rvalue_reference<Qual>::value,
GiveQualifiersToFun<_&, UnqualifiedFunType>(_::*),
GiveQualifiersToFun<_&&, UnqualifiedFunType>(_::*)>;
};
// Given a member-pointer type, this metafunction yields the target type of the
// pointer, not including the class-type. It is used to verify that the function
// call operator of AnyInvocable has the proper signature, corresponding to the
// function type that the user provided.
template <class MemberPtrType>
struct MemberTypeOfImpl;
template <class Class, class T>
struct MemberTypeOfImpl<T(Class::*)> {
using type = T;
};
template <class MemberPtrType>
using MemberTypeOf = typename MemberTypeOfImpl<MemberPtrType>::type;
template <class T, class = void>
struct IsMemberSwappableImpl : std::false_type {
static constexpr bool kIsNothrow = false;
};
template <class T>
struct IsMemberSwappableImpl<
T, absl::void_t<decltype(std::declval<T&>().swap(std::declval<T&>()))>>
: std::true_type {
static constexpr bool kIsNothrow =
noexcept(std::declval<T&>().swap(std::declval<T&>()));
};
template <class T>
using IsMemberSwappable = IsMemberSwappableImpl<T>;
template <class T>
using IsNothrowMemberSwappable =
std::integral_constant<bool, IsMemberSwappableImpl<T>::kIsNothrow>;
template <class T>
class AnyInvTestBasic : public ::testing::Test {};
TYPED_TEST_SUITE_P(AnyInvTestBasic);
TYPED_TEST_P(AnyInvTestBasic, DefaultConstruction) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun;
EXPECT_FALSE(static_cast<bool>(fun));
EXPECT_TRUE(std::is_nothrow_default_constructible<AnyInvType>::value);
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionNullptr) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun = nullptr;
EXPECT_FALSE(static_cast<bool>(fun));
EXPECT_TRUE(
(std::is_nothrow_constructible<AnyInvType, std::nullptr_t>::value));
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionNullFunctionPtr) {
using AnyInvType = typename TypeParam::AnyInvType;
using UnqualifiedFunType = typename TypeParam::UnqualifiedFunType;
UnqualifiedFunType* const null_fun_ptr = nullptr;
AnyInvType fun = null_fun_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionNullMemberFunctionPtr) {
using AnyInvType = typename TypeParam::AnyInvType;
using MemFunPtrType = typename TypeParam::MemFunPtrType;
const MemFunPtrType null_mem_fun_ptr = nullptr;
AnyInvType fun = null_mem_fun_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionNullMemberObjectPtr) {
using UnaryAnyInvType = typename TypeParam::UnaryAnyInvType;
using MemObjPtrType = typename TypeParam::MemObjPtrType;
const MemObjPtrType null_mem_obj_ptr = nullptr;
UnaryAnyInvType fun = null_mem_obj_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionMemberFunctionPtr) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun = &Int::MemberFunctionAdd;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionMemberObjectPtr) {
using UnaryAnyInvType = typename TypeParam::UnaryAnyInvType;
UnaryAnyInvType fun = &Int::value;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(13, TypeParam::ToUnaryThisParam(fun)(13));
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionFunctionReferenceDecay) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun = add_function;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionCompatibleAnyInvocableEmpty) {
using AnyInvType = typename TypeParam::AnyInvType;
using CompatibleAnyInvType = typename TypeParam::CompatibleAnyInvType;
CompatibleAnyInvType other;
AnyInvType fun = std::move(other);
EXPECT_FALSE(static_cast<bool>(other)); // NOLINT
EXPECT_EQ(other, nullptr); // NOLINT
EXPECT_EQ(nullptr, other); // NOLINT
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, ConstructionCompatibleAnyInvocableNonempty) {
using AnyInvType = typename TypeParam::AnyInvType;
using CompatibleAnyInvType = typename TypeParam::CompatibleAnyInvType;
CompatibleAnyInvType other = &add_function;
AnyInvType fun = std::move(other);
EXPECT_FALSE(static_cast<bool>(other)); // NOLINT
EXPECT_EQ(other, nullptr); // NOLINT
EXPECT_EQ(nullptr, other); // NOLINT
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestBasic, ConversionToBool) {
using AnyInvType = typename TypeParam::AnyInvType;
{
AnyInvType fun;
// This tests contextually-convertible-to-bool.
EXPECT_FALSE(fun ? true : false); // NOLINT
// Make sure that the conversion is not implicit.
EXPECT_TRUE(
(std::is_nothrow_constructible<bool, const AnyInvType&>::value));
EXPECT_FALSE((std::is_convertible<const AnyInvType&, bool>::value));
}
{
AnyInvType fun = &add_function;
// This tests contextually-convertible-to-bool.
EXPECT_TRUE(fun ? true : false); // NOLINT
}
}
TYPED_TEST_P(AnyInvTestBasic, Invocation) {
using AnyInvType = typename TypeParam::AnyInvType;
using FunType = typename TypeParam::FunType;
using AnyInvCallType = MemberTypeOf<decltype(&AnyInvType::operator())>;
// Make sure the function call operator of AnyInvocable always has the
// type that was specified via the template argument.
EXPECT_TRUE((std::is_same<AnyInvCallType, FunType>::value));
AnyInvType fun = &add_function;
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceConstruction) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType fun(absl::in_place_type<AddType>, 5);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceConstructionInitializerList) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType fun(absl::in_place_type<AddType>, {1, 2, 3, 4}, 5);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(39, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceNullFunPtrConstruction) {
using AnyInvType = typename TypeParam::AnyInvType;
using UnqualifiedFunType = typename TypeParam::UnqualifiedFunType;
AnyInvType fun(absl::in_place_type<UnqualifiedFunType*>, nullptr);
// In-place construction does not lead to empty.
EXPECT_TRUE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceNullFunPtrConstructionValueInit) {
using AnyInvType = typename TypeParam::AnyInvType;
using UnqualifiedFunType = typename TypeParam::UnqualifiedFunType;
AnyInvType fun(absl::in_place_type<UnqualifiedFunType*>);
// In-place construction does not lead to empty.
EXPECT_TRUE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceNullMemFunPtrConstruction) {
using AnyInvType = typename TypeParam::AnyInvType;
using MemFunPtrType = typename TypeParam::MemFunPtrType;
AnyInvType fun(absl::in_place_type<MemFunPtrType>, nullptr);
// In-place construction does not lead to empty.
EXPECT_TRUE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceNullMemFunPtrConstructionValueInit) {
using AnyInvType = typename TypeParam::AnyInvType;
using MemFunPtrType = typename TypeParam::MemFunPtrType;
AnyInvType fun(absl::in_place_type<MemFunPtrType>);
// In-place construction does not lead to empty.
EXPECT_TRUE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceNullMemObjPtrConstruction) {
using UnaryAnyInvType = typename TypeParam::UnaryAnyInvType;
using MemObjPtrType = typename TypeParam::MemObjPtrType;
UnaryAnyInvType fun(absl::in_place_type<MemObjPtrType>, nullptr);
// In-place construction does not lead to empty.
EXPECT_TRUE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceNullMemObjPtrConstructionValueInit) {
using UnaryAnyInvType = typename TypeParam::UnaryAnyInvType;
using MemObjPtrType = typename TypeParam::MemObjPtrType;
UnaryAnyInvType fun(absl::in_place_type<MemObjPtrType>);
// In-place construction does not lead to empty.
EXPECT_TRUE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, InPlaceVoidCovarianceConstruction) {
using VoidAnyInvType = typename TypeParam::VoidAnyInvType;
using AddType = typename TypeParam::AddType;
VoidAnyInvType fun(absl::in_place_type<AddType>, 5);
EXPECT_TRUE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestBasic, MoveConstructionFromEmpty) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType source_fun;
AnyInvType fun(std::move(source_fun));
EXPECT_FALSE(static_cast<bool>(fun));
EXPECT_TRUE(std::is_nothrow_move_constructible<AnyInvType>::value);
}
TYPED_TEST_P(AnyInvTestBasic, MoveConstructionFromNonEmpty) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType source_fun(absl::in_place_type<AddType>, 5);
AnyInvType fun(std::move(source_fun));
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
EXPECT_TRUE(std::is_nothrow_move_constructible<AnyInvType>::value);
}
TYPED_TEST_P(AnyInvTestBasic, ComparisonWithNullptrEmpty) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun;
EXPECT_TRUE(fun == nullptr);
EXPECT_TRUE(nullptr == fun);
EXPECT_FALSE(fun != nullptr);
EXPECT_FALSE(nullptr != fun);
}
TYPED_TEST_P(AnyInvTestBasic, ComparisonWithNullptrNonempty) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType fun(absl::in_place_type<AddType>, 5);
EXPECT_FALSE(fun == nullptr);
EXPECT_FALSE(nullptr == fun);
EXPECT_TRUE(fun != nullptr);
EXPECT_TRUE(nullptr != fun);
}
TYPED_TEST_P(AnyInvTestBasic, ResultType) {
using AnyInvType = typename TypeParam::AnyInvType;
using ExpectedResultType = typename TypeParam::ResultType;
EXPECT_TRUE((std::is_same<typename AnyInvType::result_type,
ExpectedResultType>::value));
}
template <class T>
class AnyInvTestCombinatoric : public ::testing::Test {};
TYPED_TEST_SUITE_P(AnyInvTestCombinatoric);
TYPED_TEST_P(AnyInvTestCombinatoric, MoveAssignEmptyEmptyLhsRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType source_fun;
AnyInvType fun;
fun = std::move(source_fun);
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, MoveAssignEmptyLhsNonemptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType source_fun(absl::in_place_type<AddType>, 5);
AnyInvType fun;
fun = std::move(source_fun);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestCombinatoric, MoveAssignNonemptyEmptyLhsRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType source_fun;
AnyInvType fun(absl::in_place_type<AddType>, 5);
fun = std::move(source_fun);
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, MoveAssignNonemptyLhsNonemptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType source_fun(absl::in_place_type<AddType>, 5);
AnyInvType fun(absl::in_place_type<AddType>, 20);
fun = std::move(source_fun);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestCombinatoric, SelfMoveAssignEmpty) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType source_fun;
source_fun = std::move(source_fun);
// This space intentionally left blank.
}
TYPED_TEST_P(AnyInvTestCombinatoric, SelfMoveAssignNonempty) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType source_fun(absl::in_place_type<AddType>, 5);
source_fun = std::move(source_fun);
// This space intentionally left blank.
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignNullptrEmptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun;
fun = nullptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignNullFunctionPtrEmptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using UnqualifiedFunType = typename TypeParam::UnqualifiedFunType;
UnqualifiedFunType* const null_fun_ptr = nullptr;
AnyInvType fun;
fun = null_fun_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignNullMemberFunctionPtrEmptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using MemFunPtrType = typename TypeParam::MemFunPtrType;
const MemFunPtrType null_mem_fun_ptr = nullptr;
AnyInvType fun;
fun = null_mem_fun_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignNullMemberObjectPtrEmptyLhs) {
using UnaryAnyInvType = typename TypeParam::UnaryAnyInvType;
using MemObjPtrType = typename TypeParam::MemObjPtrType;
const MemObjPtrType null_mem_obj_ptr = nullptr;
UnaryAnyInvType fun;
fun = null_mem_obj_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignMemberFunctionPtrEmptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun;
fun = &Int::MemberFunctionAdd;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignMemberObjectPtrEmptyLhs) {
using UnaryAnyInvType = typename TypeParam::UnaryAnyInvType;
UnaryAnyInvType fun;
fun = &Int::value;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(13, TypeParam::ToUnaryThisParam(fun)(13));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignFunctionReferenceDecayEmptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun;
fun = add_function;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestCombinatoric,
AssignCompatibleAnyInvocableEmptyLhsEmptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using CompatibleAnyInvType = typename TypeParam::CompatibleAnyInvType;
CompatibleAnyInvType other;
AnyInvType fun;
fun = std::move(other);
EXPECT_FALSE(static_cast<bool>(other)); // NOLINT
EXPECT_EQ(other, nullptr); // NOLINT
EXPECT_EQ(nullptr, other); // NOLINT
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric,
AssignCompatibleAnyInvocableEmptyLhsNonemptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using CompatibleAnyInvType = typename TypeParam::CompatibleAnyInvType;
CompatibleAnyInvType other = &add_function;
AnyInvType fun;
fun = std::move(other);
EXPECT_FALSE(static_cast<bool>(other)); // NOLINT
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignNullptrNonemptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun = &mult_function;
fun = nullptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignNullFunctionPtrNonemptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using UnqualifiedFunType = typename TypeParam::UnqualifiedFunType;
UnqualifiedFunType* const null_fun_ptr = nullptr;
AnyInvType fun = &mult_function;
fun = null_fun_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignNullMemberFunctionPtrNonemptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using MemFunPtrType = typename TypeParam::MemFunPtrType;
const MemFunPtrType null_mem_fun_ptr = nullptr;
AnyInvType fun = &mult_function;
fun = null_mem_fun_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignNullMemberObjectPtrNonemptyLhs) {
using UnaryAnyInvType = typename TypeParam::UnaryAnyInvType;
using MemObjPtrType = typename TypeParam::MemObjPtrType;
const MemObjPtrType null_mem_obj_ptr = nullptr;
UnaryAnyInvType fun = &square_function;
fun = null_mem_obj_ptr;
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignMemberFunctionPtrNonemptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun = &mult_function;
fun = &Int::MemberFunctionAdd;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignMemberObjectPtrNonemptyLhs) {
using UnaryAnyInvType = typename TypeParam::UnaryAnyInvType;
UnaryAnyInvType fun = &square_function;
fun = &Int::value;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(13, TypeParam::ToUnaryThisParam(fun)(13));
}
TYPED_TEST_P(AnyInvTestCombinatoric, AssignFunctionReferenceDecayNonemptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
AnyInvType fun = &mult_function;
fun = add_function;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestCombinatoric,
AssignCompatibleAnyInvocableNonemptyLhsEmptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using CompatibleAnyInvType = typename TypeParam::CompatibleAnyInvType;
CompatibleAnyInvType other;
AnyInvType fun = &mult_function;
fun = std::move(other);
EXPECT_FALSE(static_cast<bool>(other)); // NOLINT
EXPECT_EQ(other, nullptr); // NOLINT
EXPECT_EQ(nullptr, other); // NOLINT
EXPECT_FALSE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestCombinatoric,
AssignCompatibleAnyInvocableNonemptyLhsNonemptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using CompatibleAnyInvType = typename TypeParam::CompatibleAnyInvType;
CompatibleAnyInvType other = &add_function;
AnyInvType fun = &mult_function;
fun = std::move(other);
EXPECT_FALSE(static_cast<bool>(other)); // NOLINT
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(24, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestCombinatoric, SwapEmptyLhsEmptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
// Swap idiom
{
AnyInvType fun;
AnyInvType other;
using std::swap;
swap(fun, other);
EXPECT_FALSE(static_cast<bool>(fun));
EXPECT_FALSE(static_cast<bool>(other));
EXPECT_TRUE(
absl::type_traits_internal::IsNothrowSwappable<AnyInvType>::value);
}
// Member swap
{
AnyInvType fun;
AnyInvType other;
fun.swap(other);
EXPECT_FALSE(static_cast<bool>(fun));
EXPECT_FALSE(static_cast<bool>(other));
EXPECT_TRUE(IsNothrowMemberSwappable<AnyInvType>::value);
}
}
TYPED_TEST_P(AnyInvTestCombinatoric, SwapEmptyLhsNonemptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
// Swap idiom
{
AnyInvType fun;
AnyInvType other(absl::in_place_type<AddType>, 5);
using std::swap;
swap(fun, other);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_FALSE(static_cast<bool>(other));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
EXPECT_TRUE(
absl::type_traits_internal::IsNothrowSwappable<AnyInvType>::value);
}
// Member swap
{
AnyInvType fun;
AnyInvType other(absl::in_place_type<AddType>, 5);
fun.swap(other);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_FALSE(static_cast<bool>(other));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
EXPECT_TRUE(IsNothrowMemberSwappable<AnyInvType>::value);
}
}
TYPED_TEST_P(AnyInvTestCombinatoric, SwapNonemptyLhsEmptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
// Swap idiom
{
AnyInvType fun(absl::in_place_type<AddType>, 5);
AnyInvType other;
using std::swap;
swap(fun, other);
EXPECT_FALSE(static_cast<bool>(fun));
EXPECT_TRUE(static_cast<bool>(other));
EXPECT_EQ(29, TypeParam::ToThisParam(other)(7, 8, 9).value);
EXPECT_TRUE(
absl::type_traits_internal::IsNothrowSwappable<AnyInvType>::value);
}
// Member swap
{
AnyInvType fun(absl::in_place_type<AddType>, 5);
AnyInvType other;
fun.swap(other);
EXPECT_FALSE(static_cast<bool>(fun));
EXPECT_TRUE(static_cast<bool>(other));
EXPECT_EQ(29, TypeParam::ToThisParam(other)(7, 8, 9).value);
EXPECT_TRUE(IsNothrowMemberSwappable<AnyInvType>::value);
}
}
TYPED_TEST_P(AnyInvTestCombinatoric, SwapNonemptyLhsNonemptyRhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
// Swap idiom
{
AnyInvType fun(absl::in_place_type<AddType>, 5);
AnyInvType other(absl::in_place_type<AddType>, 6);
using std::swap;
swap(fun, other);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_TRUE(static_cast<bool>(other));
EXPECT_EQ(30, TypeParam::ToThisParam(fun)(7, 8, 9).value);
EXPECT_EQ(29, TypeParam::ToThisParam(other)(7, 8, 9).value);
EXPECT_TRUE(
absl::type_traits_internal::IsNothrowSwappable<AnyInvType>::value);
}
// Member swap
{
AnyInvType fun(absl::in_place_type<AddType>, 5);
AnyInvType other(absl::in_place_type<AddType>, 6);
fun.swap(other);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_TRUE(static_cast<bool>(other));
EXPECT_EQ(30, TypeParam::ToThisParam(fun)(7, 8, 9).value);
EXPECT_EQ(29, TypeParam::ToThisParam(other)(7, 8, 9).value);
EXPECT_TRUE(IsNothrowMemberSwappable<AnyInvType>::value);
}
}
template <class T>
class AnyInvTestMovable : public ::testing::Test {};
TYPED_TEST_SUITE_P(AnyInvTestMovable);
TYPED_TEST_P(AnyInvTestMovable, ConversionConstructionUserDefinedType) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType fun(AddType(5));
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestMovable, ConversionConstructionVoidCovariance) {
using VoidAnyInvType = typename TypeParam::VoidAnyInvType;
using AddType = typename TypeParam::AddType;
VoidAnyInvType fun(AddType(5));
EXPECT_TRUE(static_cast<bool>(fun));
}
TYPED_TEST_P(AnyInvTestMovable, ConversionAssignUserDefinedTypeEmptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType fun;
fun = AddType(5);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestMovable, ConversionAssignUserDefinedTypeNonemptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType fun = &add_function;
fun = AddType(5);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
}
TYPED_TEST_P(AnyInvTestMovable, ConversionAssignVoidCovariance) {
using VoidAnyInvType = typename TypeParam::VoidAnyInvType;
using AddType = typename TypeParam::AddType;
VoidAnyInvType fun;
fun = AddType(5);
EXPECT_TRUE(static_cast<bool>(fun));
}
template <class T>
class AnyInvTestNoexceptFalse : public ::testing::Test {};
TYPED_TEST_SUITE_P(AnyInvTestNoexceptFalse);
TYPED_TEST_P(AnyInvTestNoexceptFalse, ConversionConstructionConstraints) {
using AnyInvType = typename TypeParam::AnyInvType;
EXPECT_TRUE((std::is_constructible<
AnyInvType,
typename TypeParam::AnyInvocableFunTypeNotNoexcept*>::value));
EXPECT_FALSE((
std::is_constructible<AnyInvType,
typename TypeParam::IncompatibleInvocable>::value));
}
TYPED_TEST_P(AnyInvTestNoexceptFalse, ConversionAssignConstraints) {
using AnyInvType = typename TypeParam::AnyInvType;
EXPECT_TRUE((std::is_assignable<
AnyInvType&,
typename TypeParam::AnyInvocableFunTypeNotNoexcept*>::value));
EXPECT_FALSE(
(std::is_assignable<AnyInvType&,
typename TypeParam::IncompatibleInvocable>::value));
}
template <class T>
class AnyInvTestNoexceptTrue : public ::testing::Test {};
TYPED_TEST_SUITE_P(AnyInvTestNoexceptTrue);
TYPED_TEST_P(AnyInvTestNoexceptTrue, ConversionConstructionConstraints) {
#if ABSL_INTERNAL_CPLUSPLUS_LANG < 201703L
GTEST_SKIP() << "Noexcept was not part of the type system before C++17.";
#else
using AnyInvType = typename TypeParam::AnyInvType;
EXPECT_FALSE((std::is_constructible<
AnyInvType,
typename TypeParam::AnyInvocableFunTypeNotNoexcept*>::value));
EXPECT_FALSE((
std::is_constructible<AnyInvType,
typename TypeParam::IncompatibleInvocable>::value));
#endif
}
TYPED_TEST_P(AnyInvTestNoexceptTrue, ConversionAssignConstraints) {
#if ABSL_INTERNAL_CPLUSPLUS_LANG < 201703L
GTEST_SKIP() << "Noexcept was not part of the type system before C++17.";
#else
using AnyInvType = typename TypeParam::AnyInvType;
EXPECT_FALSE((std::is_assignable<
AnyInvType&,
typename TypeParam::AnyInvocableFunTypeNotNoexcept*>::value));
EXPECT_FALSE(
(std::is_assignable<AnyInvType&,
typename TypeParam::IncompatibleInvocable>::value));
#endif
}
template <class T>
class AnyInvTestNonRvalue : public ::testing::Test {};
TYPED_TEST_SUITE_P(AnyInvTestNonRvalue);
TYPED_TEST_P(AnyInvTestNonRvalue, ConversionConstructionReferenceWrapper) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AddType add(4);
AnyInvType fun = std::ref(add);
add.state = 5;
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(38, TypeParam::ToThisParam(fun)(10, 11, 12).value);
}
TYPED_TEST_P(AnyInvTestNonRvalue, NonMoveableResultType) {
#if ABSL_INTERNAL_CPLUSPLUS_LANG < 201703L
GTEST_SKIP() << "Copy/move elision was not standard before C++17";
#else
// Define a result type that cannot be copy- or move-constructed.
struct Result {
int x;
explicit Result(const int x_in) : x(x_in) {}
Result(Result&&) = delete;
};
static_assert(!std::is_move_constructible<Result>::value, "");
static_assert(!std::is_copy_constructible<Result>::value, "");
// Assumption check: it should nevertheless be possible to use functors that
// return a Result struct according to the language rules.
const auto return_17 = []() noexcept { return Result(17); };
EXPECT_EQ(17, return_17().x);
// Just like plain functors, it should work fine to use an AnyInvocable that
// returns the non-moveable type.
using UnqualifiedFun =
absl::conditional_t<TypeParam::kIsNoexcept, Result() noexcept, Result()>;
using Fun =
GiveQualifiersToFun<typename TypeParam::Qualifiers, UnqualifiedFun>;
AnyInvocable<Fun> any_inv(return_17);
EXPECT_EQ(17, any_inv().x);
#endif
}
TYPED_TEST_P(AnyInvTestNonRvalue, ConversionAssignReferenceWrapperEmptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AddType add(4);
AnyInvType fun;
fun = std::ref(add);
add.state = 5;
EXPECT_TRUE(
(std::is_nothrow_assignable<AnyInvType&,
std::reference_wrapper<AddType>>::value));
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(38, TypeParam::ToThisParam(fun)(10, 11, 12).value);
}
TYPED_TEST_P(AnyInvTestNonRvalue, ConversionAssignReferenceWrapperNonemptyLhs) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AddType add(4);
AnyInvType fun = &mult_function;
fun = std::ref(add);
add.state = 5;
EXPECT_TRUE(
(std::is_nothrow_assignable<AnyInvType&,
std::reference_wrapper<AddType>>::value));
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(29, TypeParam::ToThisParam(fun)(7, 8, 9).value);
EXPECT_TRUE(static_cast<bool>(fun));
EXPECT_EQ(38, TypeParam::ToThisParam(fun)(10, 11, 12).value);
}
template <class T>
class AnyInvTestRvalue : public ::testing::Test {};
TYPED_TEST_SUITE_P(AnyInvTestRvalue);
TYPED_TEST_P(AnyInvTestRvalue, ConversionConstructionReferenceWrapper) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
EXPECT_FALSE((
std::is_convertible<std::reference_wrapper<AddType>, AnyInvType>::value));
}
TYPED_TEST_P(AnyInvTestRvalue, NonMoveableResultType) {
#if ABSL_INTERNAL_CPLUSPLUS_LANG < 201703L
GTEST_SKIP() << "Copy/move elision was not standard before C++17";
#else
// Define a result type that cannot be copy- or move-constructed.
struct Result {
int x;
explicit Result(const int x_in) : x(x_in) {}
Result(Result&&) = delete;
};
static_assert(!std::is_move_constructible<Result>::value, "");
static_assert(!std::is_copy_constructible<Result>::value, "");
// Assumption check: it should nevertheless be possible to use functors that
// return a Result struct according to the language rules.
const auto return_17 = []() noexcept { return Result(17); };
EXPECT_EQ(17, return_17().x);
// Just like plain functors, it should work fine to use an AnyInvocable that
// returns the non-moveable type.
using UnqualifiedFun =
absl::conditional_t<TypeParam::kIsNoexcept, Result() noexcept, Result()>;
using Fun =
GiveQualifiersToFun<typename TypeParam::Qualifiers, UnqualifiedFun>;
EXPECT_EQ(17, AnyInvocable<Fun>(return_17)().x);
#endif
}
TYPED_TEST_P(AnyInvTestRvalue, ConversionAssignReferenceWrapper) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
EXPECT_FALSE((
std::is_assignable<AnyInvType&, std::reference_wrapper<AddType>>::value));
}
TYPED_TEST_P(AnyInvTestRvalue, NonConstCrashesOnSecondCall) {
using AnyInvType = typename TypeParam::AnyInvType;
using AddType = typename TypeParam::AddType;
AnyInvType fun(absl::in_place_type<AddType>, 5);
EXPECT_TRUE(static_cast<bool>(fun));
std::move(fun)(7, 8, 9);
// Ensure we're still valid
EXPECT_TRUE(static_cast<bool>(fun)); // NOLINT(bugprone-use-after-move)
#if !defined(NDEBUG) || ABSL_OPTION_HARDENED == 1
EXPECT_DEATH_IF_SUPPORTED(std::move(fun)(7, 8, 9), "");
#endif
}
// Ensure that any qualifiers (in particular &&-qualifiers) do not affect
// when the destructor is actually run.
TYPED_TEST_P(AnyInvTestRvalue, QualifierIndependentObjectLifetime) {
using AnyInvType = typename TypeParam::AnyInvType;
auto refs = std::make_shared<std::nullptr_t>();
{
AnyInvType fun([refs](auto&&...) noexcept { return 0; });
EXPECT_FALSE(refs.unique());
std::move(fun)(7, 8, 9);
// Ensure destructor hasn't run even if rref-qualified
EXPECT_FALSE(refs.unique());
}
EXPECT_TRUE(refs.unique());
}
// NOTE: This test suite originally attempted to enumerate all possible
// combinations of type properties but the build-time started getting too large.
// Instead, it is now assumed that certain parameters are orthogonal and so
// some combinations are elided.
// A metafunction to form a TypeList of all cv and non-rvalue ref combinations,
// coupled with all of the other explicitly specified parameters.
template <Movable Mov, Destructible Dest, NothrowCall CallExceptionSpec,
ObjSize Size, ObjAlign Align>
using NonRvalueQualifiedTestParams = ::testing::Types< //
TestParams<Mov, Dest, _, CallExceptionSpec, Size, Align>, //
TestParams<Mov, Dest, const _, CallExceptionSpec, Size, Align>, //
TestParams<Mov, Dest, _&, CallExceptionSpec, Size, Align>, //
TestParams<Mov, Dest, const _&, CallExceptionSpec, Size, Align>>;
// A metafunction to form a TypeList of const and non-const rvalue ref
// qualifiers, coupled with all of the other explicitly specified parameters.
template <Movable Mov, Destructible Dest, NothrowCall CallExceptionSpec,
ObjSize Size, ObjAlign Align>
using RvalueQualifiedTestParams = ::testing::Types<
TestParams<Mov, Dest, _&&, CallExceptionSpec, Size, Align>, //
TestParams<Mov, Dest, const _&&, CallExceptionSpec, Size, Align> //
>;
// All qualifier combinations and a noexcept function type
using TestParameterListNonRvalueQualifiersNothrowCall =
NonRvalueQualifiedTestParams<Movable::trivial, Destructible::trivial,
NothrowCall::yes, ObjSize::small,
ObjAlign::normal>;
using TestParameterListRvalueQualifiersNothrowCall =
RvalueQualifiedTestParams<Movable::trivial, Destructible::trivial,
NothrowCall::yes, ObjSize::small,
ObjAlign::normal>;
// All qualifier combinations and a non-noexcept function type
using TestParameterListNonRvalueQualifiersCallMayThrow =
NonRvalueQualifiedTestParams<Movable::trivial, Destructible::trivial,
NothrowCall::no, ObjSize::small,
ObjAlign::normal>;
using TestParameterListRvalueQualifiersCallMayThrow =
RvalueQualifiedTestParams<Movable::trivial, Destructible::trivial,
NothrowCall::no, ObjSize::small,
ObjAlign::normal>;
// Lists of various cases that should lead to remote storage
using TestParameterListRemoteMovable = ::testing::Types<
// "Normal" aligned types that are large and have trivial destructors
TestParams<Movable::trivial, Destructible::trivial, _, NothrowCall::no,
ObjSize::large, ObjAlign::normal>, //
TestParams<Movable::nothrow, Destructible::trivial, _, NothrowCall::no,
ObjSize::large, ObjAlign::normal>, //
TestParams<Movable::yes, Destructible::trivial, _, NothrowCall::no,
ObjSize::small, ObjAlign::normal>, //
TestParams<Movable::yes, Destructible::trivial, _, NothrowCall::no,
ObjSize::large, ObjAlign::normal>, //
// Same as above but with non-trivial destructors
TestParams<Movable::trivial, Destructible::nothrow, _, NothrowCall::no,
ObjSize::large, ObjAlign::normal>, //
TestParams<Movable::nothrow, Destructible::nothrow, _, NothrowCall::no,
ObjSize::large, ObjAlign::normal>, //
TestParams<Movable::yes, Destructible::nothrow, _, NothrowCall::no,
ObjSize::small, ObjAlign::normal>, //
TestParams<Movable::yes, Destructible::nothrow, _, NothrowCall::no,
ObjSize::large, ObjAlign::normal> //
// Dynamic memory allocation for over-aligned data was introduced in C++17.
// See https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0035r4.html
#if ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L
// Types that must use remote storage because of a large alignment.
,
TestParams<Movable::trivial, Destructible::trivial, _, NothrowCall::no,
ObjSize::small, ObjAlign::large>, //
TestParams<Movable::nothrow, Destructible::trivial, _, NothrowCall::no,
ObjSize::small, ObjAlign::large>, //
TestParams<Movable::trivial, Destructible::nothrow, _, NothrowCall::no,
ObjSize::small, ObjAlign::large>, //
TestParams<Movable::nothrow, Destructible::nothrow, _, NothrowCall::no,
ObjSize::small, ObjAlign::large> //
#endif
>;
using TestParameterListRemoteNonMovable = ::testing::Types<
// "Normal" aligned types that are large and have trivial destructors
TestParams<Movable::no, Destructible::trivial, _, NothrowCall::no,
ObjSize::small, ObjAlign::normal>, //
TestParams<Movable::no, Destructible::trivial, _, NothrowCall::no,
ObjSize::large, ObjAlign::normal>, //
// Same as above but with non-trivial destructors
TestParams<Movable::no, Destructible::nothrow, _, NothrowCall::no,
ObjSize::small, ObjAlign::normal>, //
TestParams<Movable::no, Destructible::nothrow, _, NothrowCall::no,
ObjSize::large, ObjAlign::normal> //
>;
// Parameters that lead to local storage
using TestParameterListLocal = ::testing::Types<
// Types that meet the requirements and have trivial destructors
TestParams<Movable::trivial, Destructible::trivial, _, NothrowCall::no,
ObjSize::small, ObjAlign::normal>, //
TestParams<Movable::nothrow, Destructible::trivial, _, NothrowCall::no,
ObjSize::small, ObjAlign::normal>, //
// Same as above but with non-trivial destructors
TestParams<Movable::trivial, Destructible::trivial, _, NothrowCall::no,
ObjSize::small, ObjAlign::normal>, //
TestParams<Movable::nothrow, Destructible::trivial, _, NothrowCall::no,
ObjSize::small, ObjAlign::normal> //
>;
// All of the tests that are run for every possible combination of types.
REGISTER_TYPED_TEST_SUITE_P(
AnyInvTestBasic, DefaultConstruction, ConstructionNullptr,
ConstructionNullFunctionPtr, ConstructionNullMemberFunctionPtr,
ConstructionNullMemberObjectPtr, ConstructionMemberFunctionPtr,
ConstructionMemberObjectPtr, ConstructionFunctionReferenceDecay,
ConstructionCompatibleAnyInvocableEmpty,
ConstructionCompatibleAnyInvocableNonempty, InPlaceConstruction,
ConversionToBool, Invocation, InPlaceConstructionInitializerList,
InPlaceNullFunPtrConstruction, InPlaceNullFunPtrConstructionValueInit,
InPlaceNullMemFunPtrConstruction, InPlaceNullMemFunPtrConstructionValueInit,
InPlaceNullMemObjPtrConstruction, InPlaceNullMemObjPtrConstructionValueInit,
InPlaceVoidCovarianceConstruction, MoveConstructionFromEmpty,
MoveConstructionFromNonEmpty, ComparisonWithNullptrEmpty,
ComparisonWithNullptrNonempty, ResultType);
INSTANTIATE_TYPED_TEST_SUITE_P(
NonRvalueCallMayThrow, AnyInvTestBasic,
TestParameterListNonRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RvalueCallMayThrow, AnyInvTestBasic,
TestParameterListRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteMovable, AnyInvTestBasic,
TestParameterListRemoteMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteNonMovable, AnyInvTestBasic,
TestParameterListRemoteNonMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(Local, AnyInvTestBasic, TestParameterListLocal);
INSTANTIATE_TYPED_TEST_SUITE_P(NonRvalueCallNothrow, AnyInvTestBasic,
TestParameterListNonRvalueQualifiersNothrowCall);
INSTANTIATE_TYPED_TEST_SUITE_P(CallNothrowRvalue, AnyInvTestBasic,
TestParameterListRvalueQualifiersNothrowCall);
// Tests for functions that take two operands.
REGISTER_TYPED_TEST_SUITE_P(
AnyInvTestCombinatoric, MoveAssignEmptyEmptyLhsRhs,
MoveAssignEmptyLhsNonemptyRhs, MoveAssignNonemptyEmptyLhsRhs,
MoveAssignNonemptyLhsNonemptyRhs, SelfMoveAssignEmpty,
SelfMoveAssignNonempty, AssignNullptrEmptyLhs,
AssignNullFunctionPtrEmptyLhs, AssignNullMemberFunctionPtrEmptyLhs,
AssignNullMemberObjectPtrEmptyLhs, AssignMemberFunctionPtrEmptyLhs,
AssignMemberObjectPtrEmptyLhs, AssignFunctionReferenceDecayEmptyLhs,
AssignCompatibleAnyInvocableEmptyLhsEmptyRhs,
AssignCompatibleAnyInvocableEmptyLhsNonemptyRhs, AssignNullptrNonemptyLhs,
AssignNullFunctionPtrNonemptyLhs, AssignNullMemberFunctionPtrNonemptyLhs,
AssignNullMemberObjectPtrNonemptyLhs, AssignMemberFunctionPtrNonemptyLhs,
AssignMemberObjectPtrNonemptyLhs, AssignFunctionReferenceDecayNonemptyLhs,
AssignCompatibleAnyInvocableNonemptyLhsEmptyRhs,
AssignCompatibleAnyInvocableNonemptyLhsNonemptyRhs, SwapEmptyLhsEmptyRhs,
SwapEmptyLhsNonemptyRhs, SwapNonemptyLhsEmptyRhs,
SwapNonemptyLhsNonemptyRhs);
INSTANTIATE_TYPED_TEST_SUITE_P(
NonRvalueCallMayThrow, AnyInvTestCombinatoric,
TestParameterListNonRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RvalueCallMayThrow, AnyInvTestCombinatoric,
TestParameterListRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteMovable, AnyInvTestCombinatoric,
TestParameterListRemoteMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteNonMovable, AnyInvTestCombinatoric,
TestParameterListRemoteNonMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(Local, AnyInvTestCombinatoric,
TestParameterListLocal);
INSTANTIATE_TYPED_TEST_SUITE_P(NonRvalueCallNothrow, AnyInvTestCombinatoric,
TestParameterListNonRvalueQualifiersNothrowCall);
INSTANTIATE_TYPED_TEST_SUITE_P(RvalueCallNothrow, AnyInvTestCombinatoric,
TestParameterListRvalueQualifiersNothrowCall);
REGISTER_TYPED_TEST_SUITE_P(AnyInvTestMovable,
ConversionConstructionUserDefinedType,
ConversionConstructionVoidCovariance,
ConversionAssignUserDefinedTypeEmptyLhs,
ConversionAssignUserDefinedTypeNonemptyLhs,
ConversionAssignVoidCovariance);
INSTANTIATE_TYPED_TEST_SUITE_P(
NonRvalueCallMayThrow, AnyInvTestMovable,
TestParameterListNonRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RvalueCallMayThrow, AnyInvTestMovable,
TestParameterListRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteMovable, AnyInvTestMovable,
TestParameterListRemoteMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(Local, AnyInvTestMovable,
TestParameterListLocal);
INSTANTIATE_TYPED_TEST_SUITE_P(NonRvalueCallNothrow, AnyInvTestMovable,
TestParameterListNonRvalueQualifiersNothrowCall);
INSTANTIATE_TYPED_TEST_SUITE_P(RvalueCallNothrow, AnyInvTestMovable,
TestParameterListRvalueQualifiersNothrowCall);
REGISTER_TYPED_TEST_SUITE_P(AnyInvTestNoexceptFalse,
ConversionConstructionConstraints,
ConversionAssignConstraints);
INSTANTIATE_TYPED_TEST_SUITE_P(
NonRvalueCallMayThrow, AnyInvTestNoexceptFalse,
TestParameterListNonRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RvalueCallMayThrow, AnyInvTestNoexceptFalse,
TestParameterListRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteMovable, AnyInvTestNoexceptFalse,
TestParameterListRemoteMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteNonMovable, AnyInvTestNoexceptFalse,
TestParameterListRemoteNonMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(Local, AnyInvTestNoexceptFalse,
TestParameterListLocal);
REGISTER_TYPED_TEST_SUITE_P(AnyInvTestNoexceptTrue,
ConversionConstructionConstraints,
ConversionAssignConstraints);
INSTANTIATE_TYPED_TEST_SUITE_P(NonRvalueCallNothrow, AnyInvTestNoexceptTrue,
TestParameterListNonRvalueQualifiersNothrowCall);
INSTANTIATE_TYPED_TEST_SUITE_P(RvalueCallNothrow, AnyInvTestNoexceptTrue,
TestParameterListRvalueQualifiersNothrowCall);
REGISTER_TYPED_TEST_SUITE_P(AnyInvTestNonRvalue,
ConversionConstructionReferenceWrapper,
NonMoveableResultType,
ConversionAssignReferenceWrapperEmptyLhs,
ConversionAssignReferenceWrapperNonemptyLhs);
INSTANTIATE_TYPED_TEST_SUITE_P(
NonRvalueCallMayThrow, AnyInvTestNonRvalue,
TestParameterListNonRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteMovable, AnyInvTestNonRvalue,
TestParameterListRemoteMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(RemoteNonMovable, AnyInvTestNonRvalue,
TestParameterListRemoteNonMovable);
INSTANTIATE_TYPED_TEST_SUITE_P(Local, AnyInvTestNonRvalue,
TestParameterListLocal);
INSTANTIATE_TYPED_TEST_SUITE_P(NonRvalueCallNothrow, AnyInvTestNonRvalue,
TestParameterListNonRvalueQualifiersNothrowCall);
REGISTER_TYPED_TEST_SUITE_P(AnyInvTestRvalue,
ConversionConstructionReferenceWrapper,
NonMoveableResultType,
ConversionAssignReferenceWrapper,
NonConstCrashesOnSecondCall,
QualifierIndependentObjectLifetime);
INSTANTIATE_TYPED_TEST_SUITE_P(RvalueCallMayThrow, AnyInvTestRvalue,
TestParameterListRvalueQualifiersCallMayThrow);
INSTANTIATE_TYPED_TEST_SUITE_P(CallNothrowRvalue, AnyInvTestRvalue,
TestParameterListRvalueQualifiersNothrowCall);
// Minimal SFINAE testing for platforms where we can't run the tests, but we can
// build binaries for.
static_assert(
std::is_convertible<void (*)(), absl::AnyInvocable<void() &&>>::value, "");
static_assert(!std::is_convertible<void*, absl::AnyInvocable<void() &&>>::value,
"");
#undef ABSL_INTERNAL_NOEXCEPT_SPEC
} // namespace