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UncheckedOptionalAccessModelTest.cpp
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UncheckedOptionalAccessModelTest.cpp
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//===- UncheckedOptionalAccessModelTest.cpp -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// FIXME: Move this to clang/unittests/Analysis/FlowSensitive/Models.
#include "clang/Analysis/FlowSensitive/Models/UncheckedOptionalAccessModel.h"
#include "TestingSupport.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Analysis/FlowSensitive/SourceLocationsLattice.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Error.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <string>
#include <utility>
#include <vector>
using namespace clang;
using namespace dataflow;
using namespace test;
using ::testing::Pair;
using ::testing::UnorderedElementsAre;
// FIXME: Move header definitions in separate file(s).
static constexpr char CSDtdDefHeader[] = R"(
#ifndef CSTDDEF_H
#define CSTDDEF_H
namespace std {
typedef decltype(sizeof(char)) size_t;
using nullptr_t = decltype(nullptr);
} // namespace std
#endif // CSTDDEF_H
)";
static constexpr char StdTypeTraitsHeader[] = R"(
#ifndef STD_TYPE_TRAITS_H
#define STD_TYPE_TRAITS_H
#include "cstddef.h"
namespace std {
template <typename T, T V>
struct integral_constant {
static constexpr T value = V;
};
using true_type = integral_constant<bool, true>;
using false_type = integral_constant<bool, false>;
template< class T > struct remove_reference {typedef T type;};
template< class T > struct remove_reference<T&> {typedef T type;};
template< class T > struct remove_reference<T&&> {typedef T type;};
template <class T>
using remove_reference_t = typename remove_reference<T>::type;
template <class T>
struct remove_extent {
typedef T type;
};
template <class T>
struct remove_extent<T[]> {
typedef T type;
};
template <class T, size_t N>
struct remove_extent<T[N]> {
typedef T type;
};
template <class T>
struct is_array : false_type {};
template <class T>
struct is_array<T[]> : true_type {};
template <class T, size_t N>
struct is_array<T[N]> : true_type {};
template <class>
struct is_function : false_type {};
template <class Ret, class... Args>
struct is_function<Ret(Args...)> : true_type {};
namespace detail {
template <class T>
struct type_identity {
using type = T;
}; // or use type_identity (since C++20)
template <class T>
auto try_add_pointer(int) -> type_identity<typename remove_reference<T>::type*>;
template <class T>
auto try_add_pointer(...) -> type_identity<T>;
} // namespace detail
template <class T>
struct add_pointer : decltype(detail::try_add_pointer<T>(0)) {};
template <bool B, class T, class F>
struct conditional {
typedef T type;
};
template <class T, class F>
struct conditional<false, T, F> {
typedef F type;
};
template <class T>
struct remove_cv {
typedef T type;
};
template <class T>
struct remove_cv<const T> {
typedef T type;
};
template <class T>
struct remove_cv<volatile T> {
typedef T type;
};
template <class T>
struct remove_cv<const volatile T> {
typedef T type;
};
template <class T>
using remove_cv_t = typename remove_cv<T>::type;
template <class T>
struct decay {
private:
typedef typename remove_reference<T>::type U;
public:
typedef typename conditional<
is_array<U>::value, typename remove_extent<U>::type*,
typename conditional<is_function<U>::value, typename add_pointer<U>::type,
typename remove_cv<U>::type>::type>::type type;
};
template <bool B, class T = void>
struct enable_if {};
template <class T>
struct enable_if<true, T> {
typedef T type;
};
template <bool B, class T = void>
using enable_if_t = typename enable_if<B, T>::type;
template <class T, class U>
struct is_same : false_type {};
template <class T>
struct is_same<T, T> : true_type {};
template <class T>
struct is_void : is_same<void, typename remove_cv<T>::type> {};
namespace detail {
template <class T>
auto try_add_rvalue_reference(int) -> type_identity<T&&>;
template <class T>
auto try_add_rvalue_reference(...) -> type_identity<T>;
} // namespace detail
template <class T>
struct add_rvalue_reference : decltype(detail::try_add_rvalue_reference<T>(0)) {
};
template <class T>
typename add_rvalue_reference<T>::type declval() noexcept;
namespace detail {
template <class T>
auto test_returnable(int)
-> decltype(void(static_cast<T (*)()>(nullptr)), true_type{});
template <class>
auto test_returnable(...) -> false_type;
template <class From, class To>
auto test_implicitly_convertible(int)
-> decltype(void(declval<void (&)(To)>()(declval<From>())), true_type{});
template <class, class>
auto test_implicitly_convertible(...) -> false_type;
} // namespace detail
template <class From, class To>
struct is_convertible
: integral_constant<bool,
(decltype(detail::test_returnable<To>(0))::value &&
decltype(detail::test_implicitly_convertible<From, To>(
0))::value) ||
(is_void<From>::value && is_void<To>::value)> {};
template <class From, class To>
inline constexpr bool is_convertible_v = is_convertible<From, To>::value;
template <class...>
using void_t = void;
template <class, class T, class... Args>
struct is_constructible_ : false_type {};
template <class T, class... Args>
struct is_constructible_<void_t<decltype(T(declval<Args>()...))>, T, Args...>
: true_type {};
template <class T, class... Args>
using is_constructible = is_constructible_<void_t<>, T, Args...>;
template <class T, class... Args>
inline constexpr bool is_constructible_v = is_constructible<T, Args...>::value;
template <class _Tp>
struct __uncvref {
typedef typename remove_cv<typename remove_reference<_Tp>::type>::type type;
};
template <class _Tp>
using __uncvref_t = typename __uncvref<_Tp>::type;
template <bool _Val>
using _BoolConstant = integral_constant<bool, _Val>;
template <class _Tp, class _Up>
using _IsSame = _BoolConstant<__is_same(_Tp, _Up)>;
template <class _Tp, class _Up>
using _IsNotSame = _BoolConstant<!__is_same(_Tp, _Up)>;
template <bool>
struct _MetaBase;
template <>
struct _MetaBase<true> {
template <class _Tp, class _Up>
using _SelectImpl = _Tp;
template <template <class...> class _FirstFn, template <class...> class,
class... _Args>
using _SelectApplyImpl = _FirstFn<_Args...>;
template <class _First, class...>
using _FirstImpl = _First;
template <class, class _Second, class...>
using _SecondImpl = _Second;
template <class _Result, class _First, class... _Rest>
using _OrImpl =
typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::
template _OrImpl<_First, _Rest...>;
};
template <>
struct _MetaBase<false> {
template <class _Tp, class _Up>
using _SelectImpl = _Up;
template <template <class...> class, template <class...> class _SecondFn,
class... _Args>
using _SelectApplyImpl = _SecondFn<_Args...>;
template <class _Result, class...>
using _OrImpl = _Result;
};
template <bool _Cond, class _IfRes, class _ElseRes>
using _If = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>;
template <class... _Rest>
using _Or = typename _MetaBase<sizeof...(_Rest) !=
0>::template _OrImpl<false_type, _Rest...>;
template <bool _Bp, class _Tp = void>
using __enable_if_t = typename enable_if<_Bp, _Tp>::type;
template <class...>
using __expand_to_true = true_type;
template <class... _Pred>
__expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int);
template <class...>
false_type __and_helper(...);
template <class... _Pred>
using _And = decltype(__and_helper<_Pred...>(0));
template <class _Pred>
struct _Not : _BoolConstant<!_Pred::value> {};
struct __check_tuple_constructor_fail {
static constexpr bool __enable_explicit_default() { return false; }
static constexpr bool __enable_implicit_default() { return false; }
template <class...>
static constexpr bool __enable_explicit() {
return false;
}
template <class...>
static constexpr bool __enable_implicit() {
return false;
}
};
template <typename, typename _Tp>
struct __select_2nd {
typedef _Tp type;
};
template <class _Tp, class _Arg>
typename __select_2nd<decltype((declval<_Tp>() = declval<_Arg>())),
true_type>::type
__is_assignable_test(int);
template <class, class>
false_type __is_assignable_test(...);
template <class _Tp, class _Arg,
bool = is_void<_Tp>::value || is_void<_Arg>::value>
struct __is_assignable_imp
: public decltype((__is_assignable_test<_Tp, _Arg>(0))) {};
template <class _Tp, class _Arg>
struct __is_assignable_imp<_Tp, _Arg, true> : public false_type {};
template <class _Tp, class _Arg>
struct is_assignable : public __is_assignable_imp<_Tp, _Arg> {};
template <class _Tp>
struct __libcpp_is_integral : public false_type {};
template <>
struct __libcpp_is_integral<bool> : public true_type {};
template <>
struct __libcpp_is_integral<char> : public true_type {};
template <>
struct __libcpp_is_integral<signed char> : public true_type {};
template <>
struct __libcpp_is_integral<unsigned char> : public true_type {};
template <>
struct __libcpp_is_integral<wchar_t> : public true_type {};
template <>
struct __libcpp_is_integral<short> : public true_type {}; // NOLINT
template <>
struct __libcpp_is_integral<unsigned short> : public true_type {}; // NOLINT
template <>
struct __libcpp_is_integral<int> : public true_type {};
template <>
struct __libcpp_is_integral<unsigned int> : public true_type {};
template <>
struct __libcpp_is_integral<long> : public true_type {}; // NOLINT
template <>
struct __libcpp_is_integral<unsigned long> : public true_type {}; // NOLINT
template <>
struct __libcpp_is_integral<long long> : public true_type {}; // NOLINT
template <> // NOLINTNEXTLINE
struct __libcpp_is_integral<unsigned long long> : public true_type {};
template <class _Tp>
struct is_integral
: public __libcpp_is_integral<typename remove_cv<_Tp>::type> {};
template <class _Tp>
struct __libcpp_is_floating_point : public false_type {};
template <>
struct __libcpp_is_floating_point<float> : public true_type {};
template <>
struct __libcpp_is_floating_point<double> : public true_type {};
template <>
struct __libcpp_is_floating_point<long double> : public true_type {};
template <class _Tp>
struct is_floating_point
: public __libcpp_is_floating_point<typename remove_cv<_Tp>::type> {};
template <class _Tp>
struct is_arithmetic
: public integral_constant<bool, is_integral<_Tp>::value ||
is_floating_point<_Tp>::value> {};
template <class _Tp>
struct __libcpp_is_pointer : public false_type {};
template <class _Tp>
struct __libcpp_is_pointer<_Tp*> : public true_type {};
template <class _Tp>
struct is_pointer : public __libcpp_is_pointer<typename remove_cv<_Tp>::type> {
};
template <class _Tp>
struct __libcpp_is_member_pointer : public false_type {};
template <class _Tp, class _Up>
struct __libcpp_is_member_pointer<_Tp _Up::*> : public true_type {};
template <class _Tp>
struct is_member_pointer
: public __libcpp_is_member_pointer<typename remove_cv<_Tp>::type> {};
template <class _Tp>
struct __libcpp_union : public false_type {};
template <class _Tp>
struct is_union : public __libcpp_union<typename remove_cv<_Tp>::type> {};
template <class T>
struct is_reference : false_type {};
template <class T>
struct is_reference<T&> : true_type {};
template <class T>
struct is_reference<T&&> : true_type {};
template <class T>
inline constexpr bool is_reference_v = is_reference<T>::value;
struct __two {
char __lx[2];
};
namespace __is_class_imp {
template <class _Tp>
char __test(int _Tp::*);
template <class _Tp>
__two __test(...);
} // namespace __is_class_imp
template <class _Tp>
struct is_class
: public integral_constant<bool,
sizeof(__is_class_imp::__test<_Tp>(0)) == 1 &&
!is_union<_Tp>::value> {};
template <class _Tp>
struct __is_nullptr_t_impl : public false_type {};
template <>
struct __is_nullptr_t_impl<nullptr_t> : public true_type {};
template <class _Tp>
struct __is_nullptr_t
: public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {};
template <class _Tp>
struct is_null_pointer
: public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {};
template <class _Tp>
struct is_enum
: public integral_constant<
bool, !is_void<_Tp>::value && !is_integral<_Tp>::value &&
!is_floating_point<_Tp>::value && !is_array<_Tp>::value &&
!is_pointer<_Tp>::value && !is_reference<_Tp>::value &&
!is_member_pointer<_Tp>::value && !is_union<_Tp>::value &&
!is_class<_Tp>::value && !is_function<_Tp>::value> {};
template <class _Tp>
struct is_scalar
: public integral_constant<
bool, is_arithmetic<_Tp>::value || is_member_pointer<_Tp>::value ||
is_pointer<_Tp>::value || __is_nullptr_t<_Tp>::value ||
is_enum<_Tp>::value> {};
template <>
struct is_scalar<nullptr_t> : public true_type {};
} // namespace std
#endif // STD_TYPE_TRAITS_H
)";
static constexpr char AbslTypeTraitsHeader[] = R"(
#ifndef ABSL_TYPE_TRAITS_H
#define ABSL_TYPE_TRAITS_H
#include "std_type_traits.h"
namespace absl {
template <typename... Ts>
struct conjunction : std::true_type {};
template <typename T, typename... Ts>
struct conjunction<T, Ts...>
: std::conditional<T::value, conjunction<Ts...>, T>::type {};
template <typename T>
struct conjunction<T> : T {};
template <typename T>
struct negation : std::integral_constant<bool, !T::value> {};
template <bool B, typename T = void>
using enable_if_t = typename std::enable_if<B, T>::type;
} // namespace absl
#endif // ABSL_TYPE_TRAITS_H
)";
static constexpr char StdStringHeader[] = R"(
#ifndef STRING_H
#define STRING_H
namespace std {
struct string {
string(const char*);
~string();
bool empty();
};
bool operator!=(const string &LHS, const char *RHS);
} // namespace std
#endif // STRING_H
)";
static constexpr char StdUtilityHeader[] = R"(
#ifndef UTILITY_H
#define UTILITY_H
#include "std_type_traits.h"
namespace std {
template <typename T>
constexpr remove_reference_t<T>&& move(T&& x);
template <typename T>
void swap(T& a, T& b) noexcept;
} // namespace std
#endif // UTILITY_H
)";
static constexpr char StdInitializerListHeader[] = R"(
#ifndef INITIALIZER_LIST_H
#define INITIALIZER_LIST_H
namespace std {
template <typename T>
class initializer_list {
public:
initializer_list() noexcept;
};
} // namespace std
#endif // INITIALIZER_LIST_H
)";
static constexpr char StdOptionalHeader[] = R"(
#include "std_initializer_list.h"
#include "std_type_traits.h"
#include "std_utility.h"
namespace std {
struct in_place_t {};
constexpr in_place_t in_place;
struct nullopt_t {
constexpr explicit nullopt_t() {}
};
constexpr nullopt_t nullopt;
template <class _Tp>
struct __optional_destruct_base {
constexpr void reset() noexcept;
};
template <class _Tp>
struct __optional_storage_base : __optional_destruct_base<_Tp> {
constexpr bool has_value() const noexcept;
};
template <typename _Tp>
class optional : private __optional_storage_base<_Tp> {
using __base = __optional_storage_base<_Tp>;
public:
using value_type = _Tp;
private:
struct _CheckOptionalArgsConstructor {
template <class _Up>
static constexpr bool __enable_implicit() {
return is_constructible_v<_Tp, _Up&&> && is_convertible_v<_Up&&, _Tp>;
}
template <class _Up>
static constexpr bool __enable_explicit() {
return is_constructible_v<_Tp, _Up&&> && !is_convertible_v<_Up&&, _Tp>;
}
};
template <class _Up>
using _CheckOptionalArgsCtor =
_If<_IsNotSame<__uncvref_t<_Up>, in_place_t>::value &&
_IsNotSame<__uncvref_t<_Up>, optional>::value,
_CheckOptionalArgsConstructor, __check_tuple_constructor_fail>;
template <class _QualUp>
struct _CheckOptionalLikeConstructor {
template <class _Up, class _Opt = optional<_Up>>
using __check_constructible_from_opt =
_Or<is_constructible<_Tp, _Opt&>, is_constructible<_Tp, _Opt const&>,
is_constructible<_Tp, _Opt&&>, is_constructible<_Tp, _Opt const&&>,
is_convertible<_Opt&, _Tp>, is_convertible<_Opt const&, _Tp>,
is_convertible<_Opt&&, _Tp>, is_convertible<_Opt const&&, _Tp>>;
template <class _Up, class _QUp = _QualUp>
static constexpr bool __enable_implicit() {
return is_convertible<_QUp, _Tp>::value &&
!__check_constructible_from_opt<_Up>::value;
}
template <class _Up, class _QUp = _QualUp>
static constexpr bool __enable_explicit() {
return !is_convertible<_QUp, _Tp>::value &&
!__check_constructible_from_opt<_Up>::value;
}
};
template <class _Up, class _QualUp>
using _CheckOptionalLikeCtor =
_If<_And<_IsNotSame<_Up, _Tp>, is_constructible<_Tp, _QualUp>>::value,
_CheckOptionalLikeConstructor<_QualUp>,
__check_tuple_constructor_fail>;
template <class _Up, class _QualUp>
using _CheckOptionalLikeAssign = _If<
_And<
_IsNotSame<_Up, _Tp>,
is_constructible<_Tp, _QualUp>,
is_assignable<_Tp&, _QualUp>
>::value,
_CheckOptionalLikeConstructor<_QualUp>,
__check_tuple_constructor_fail
>;
public:
constexpr optional() noexcept {}
constexpr optional(const optional&) = default;
constexpr optional(optional&&) = default;
constexpr optional(nullopt_t) noexcept {}
template <
class _InPlaceT, class... _Args,
class = enable_if_t<_And<_IsSame<_InPlaceT, in_place_t>,
is_constructible<value_type, _Args...>>::value>>
constexpr explicit optional(_InPlaceT, _Args&&... __args);
template <class _Up, class... _Args,
class = enable_if_t<is_constructible_v<
value_type, initializer_list<_Up>&, _Args...>>>
constexpr explicit optional(in_place_t, initializer_list<_Up> __il,
_Args&&... __args);
template <
class _Up = value_type,
enable_if_t<_CheckOptionalArgsCtor<_Up>::template __enable_implicit<_Up>(),
int> = 0>
constexpr optional(_Up&& __v);
template <
class _Up,
enable_if_t<_CheckOptionalArgsCtor<_Up>::template __enable_explicit<_Up>(),
int> = 0>
constexpr explicit optional(_Up&& __v);
template <class _Up, enable_if_t<_CheckOptionalLikeCtor<_Up, _Up const&>::
template __enable_implicit<_Up>(),
int> = 0>
constexpr optional(const optional<_Up>& __v);
template <class _Up, enable_if_t<_CheckOptionalLikeCtor<_Up, _Up const&>::
template __enable_explicit<_Up>(),
int> = 0>
constexpr explicit optional(const optional<_Up>& __v);
template <class _Up, enable_if_t<_CheckOptionalLikeCtor<_Up, _Up&&>::
template __enable_implicit<_Up>(),
int> = 0>
constexpr optional(optional<_Up>&& __v);
template <class _Up, enable_if_t<_CheckOptionalLikeCtor<_Up, _Up&&>::
template __enable_explicit<_Up>(),
int> = 0>
constexpr explicit optional(optional<_Up>&& __v);
constexpr optional& operator=(nullopt_t) noexcept;
optional& operator=(const optional&);
optional& operator=(optional&&);
template <class _Up = value_type,
class = enable_if_t<_And<_IsNotSame<__uncvref_t<_Up>, optional>,
_Or<_IsNotSame<__uncvref_t<_Up>, value_type>,
_Not<is_scalar<value_type>>>,
is_constructible<value_type, _Up>,
is_assignable<value_type&, _Up>>::value>>
constexpr optional& operator=(_Up&& __v);
template <class _Up, enable_if_t<_CheckOptionalLikeAssign<_Up, _Up const&>::
template __enable_assign<_Up>(),
int> = 0>
constexpr optional& operator=(const optional<_Up>& __v);
template <class _Up, enable_if_t<_CheckOptionalLikeCtor<_Up, _Up&&>::
template __enable_assign<_Up>(),
int> = 0>
constexpr optional& operator=(optional<_Up>&& __v);
const _Tp& operator*() const&;
_Tp& operator*() &;
const _Tp&& operator*() const&&;
_Tp&& operator*() &&;
const _Tp* operator->() const;
_Tp* operator->();
const _Tp& value() const&;
_Tp& value() &;
const _Tp&& value() const&&;
_Tp&& value() &&;
template <typename U>
constexpr _Tp value_or(U&& v) const&;
template <typename U>
_Tp value_or(U&& v) &&;
template <typename... Args>
_Tp& emplace(Args&&... args);
template <typename U, typename... Args>
_Tp& emplace(std::initializer_list<U> ilist, Args&&... args);
using __base::reset;
constexpr explicit operator bool() const noexcept;
using __base::has_value;
constexpr void swap(optional& __opt) noexcept;
};
template <typename T>
constexpr optional<typename std::decay<T>::type> make_optional(T&& v);
template <typename T, typename... Args>
constexpr optional<T> make_optional(Args&&... args);
template <typename T, typename U, typename... Args>
constexpr optional<T> make_optional(std::initializer_list<U> il,
Args&&... args);
} // namespace std
)";
static constexpr char AbslOptionalHeader[] = R"(
#include "absl_type_traits.h"
#include "std_initializer_list.h"
#include "std_type_traits.h"
#include "std_utility.h"
namespace absl {
struct nullopt_t {
constexpr explicit nullopt_t() {}
};
constexpr nullopt_t nullopt;
struct in_place_t {};
constexpr in_place_t in_place;
template <typename T>
class optional;
namespace optional_internal {
template <typename T, typename U>
struct is_constructible_convertible_from_optional
: std::integral_constant<
bool, std::is_constructible<T, optional<U>&>::value ||
std::is_constructible<T, optional<U>&&>::value ||
std::is_constructible<T, const optional<U>&>::value ||
std::is_constructible<T, const optional<U>&&>::value ||
std::is_convertible<optional<U>&, T>::value ||
std::is_convertible<optional<U>&&, T>::value ||
std::is_convertible<const optional<U>&, T>::value ||
std::is_convertible<const optional<U>&&, T>::value> {};
template <typename T, typename U>
struct is_constructible_convertible_assignable_from_optional
: std::integral_constant<
bool, is_constructible_convertible_from_optional<T, U>::value ||
std::is_assignable<T&, optional<U>&>::value ||
std::is_assignable<T&, optional<U>&&>::value ||
std::is_assignable<T&, const optional<U>&>::value ||
std::is_assignable<T&, const optional<U>&&>::value> {};
} // namespace optional_internal
template <typename T>
class optional {
public:
constexpr optional() noexcept;
constexpr optional(nullopt_t) noexcept;
optional(const optional&) = default;
optional(optional&&) = default;
template <typename InPlaceT, typename... Args,
absl::enable_if_t<absl::conjunction<
std::is_same<InPlaceT, in_place_t>,
std::is_constructible<T, Args&&...>>::value>* = nullptr>
constexpr explicit optional(InPlaceT, Args&&... args);
template <typename U, typename... Args,
typename = typename std::enable_if<std::is_constructible<
T, std::initializer_list<U>&, Args&&...>::value>::type>
constexpr explicit optional(in_place_t, std::initializer_list<U> il,
Args&&... args);
template <
typename U = T,
typename std::enable_if<
absl::conjunction<absl::negation<std::is_same<
in_place_t, typename std::decay<U>::type>>,
absl::negation<std::is_same<
optional<T>, typename std::decay<U>::type>>,
std::is_convertible<U&&, T>,
std::is_constructible<T, U&&>>::value,
bool>::type = false>
constexpr optional(U&& v);
template <
typename U = T,
typename std::enable_if<
absl::conjunction<absl::negation<std::is_same<
in_place_t, typename std::decay<U>::type>>,
absl::negation<std::is_same<
optional<T>, typename std::decay<U>::type>>,
absl::negation<std::is_convertible<U&&, T>>,
std::is_constructible<T, U&&>>::value,
bool>::type = false>
explicit constexpr optional(U&& v);
template <typename U,
typename std::enable_if<
absl::conjunction<
absl::negation<std::is_same<T, U>>,
std::is_constructible<T, const U&>,
absl::negation<
optional_internal::
is_constructible_convertible_from_optional<T, U>>,
std::is_convertible<const U&, T>>::value,
bool>::type = false>
optional(const optional<U>& rhs);
template <typename U,
typename std::enable_if<
absl::conjunction<
absl::negation<std::is_same<T, U>>,
std::is_constructible<T, const U&>,
absl::negation<
optional_internal::
is_constructible_convertible_from_optional<T, U>>,
absl::negation<std::is_convertible<const U&, T>>>::value,
bool>::type = false>
explicit optional(const optional<U>& rhs);
template <
typename U,
typename std::enable_if<
absl::conjunction<
absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>,
absl::negation<
optional_internal::is_constructible_convertible_from_optional<
T, U>>,
std::is_convertible<U&&, T>>::value,
bool>::type = false>
optional(optional<U>&& rhs);
template <
typename U,
typename std::enable_if<
absl::conjunction<
absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>,
absl::negation<
optional_internal::is_constructible_convertible_from_optional<
T, U>>,
absl::negation<std::is_convertible<U&&, T>>>::value,
bool>::type = false>
explicit optional(optional<U>&& rhs);
optional& operator=(nullopt_t) noexcept;
optional& operator=(const optional& src);
optional& operator=(optional&& src);
template <
typename U = T,
typename = typename std::enable_if<absl::conjunction<
absl::negation<
std::is_same<optional<T>, typename std::decay<U>::type>>,
absl::negation<
absl::conjunction<std::is_scalar<T>,
std::is_same<T, typename std::decay<U>::type>>>,
std::is_constructible<T, U>, std::is_assignable<T&, U>>::value>::type>
optional& operator=(U&& v);
template <
typename U,
typename = typename std::enable_if<absl::conjunction<
absl::negation<std::is_same<T, U>>,
std::is_constructible<T, const U&>, std::is_assignable<T&, const U&>,
absl::negation<
optional_internal::
is_constructible_convertible_assignable_from_optional<
T, U>>>::value>::type>
optional& operator=(const optional<U>& rhs);
template <typename U,
typename = typename std::enable_if<absl::conjunction<
absl::negation<std::is_same<T, U>>, std::is_constructible<T, U>,
std::is_assignable<T&, U>,
absl::negation<
optional_internal::
is_constructible_convertible_assignable_from_optional<
T, U>>>::value>::type>
optional& operator=(optional<U>&& rhs);
const T& operator*() const&;
T& operator*() &;
const T&& operator*() const&&;
T&& operator*() &&;
const T* operator->() const;
T* operator->();
const T& value() const&;
T& value() &;
const T&& value() const&&;
T&& value() &&;
template <typename U>
constexpr T value_or(U&& v) const&;
template <typename U>
T value_or(U&& v) &&;
template <typename... Args>
T& emplace(Args&&... args);
template <typename U, typename... Args>
T& emplace(std::initializer_list<U> ilist, Args&&... args);
void reset() noexcept;
constexpr explicit operator bool() const noexcept;
constexpr bool has_value() const noexcept;
void swap(optional& rhs) noexcept;
};
template <typename T>
constexpr optional<typename std::decay<T>::type> make_optional(T&& v);
template <typename T, typename... Args>
constexpr optional<T> make_optional(Args&&... args);
template <typename T, typename U, typename... Args>
constexpr optional<T> make_optional(std::initializer_list<U> il,
Args&&... args);
} // namespace absl
)";
static constexpr char BaseOptionalHeader[] = R"(
#include "std_initializer_list.h"
#include "std_type_traits.h"
#include "std_utility.h"
namespace base {
struct in_place_t {};
constexpr in_place_t in_place;
struct nullopt_t {
constexpr explicit nullopt_t() {}
};
constexpr nullopt_t nullopt;
template <typename T>
class Optional;
namespace internal {