|
@@ -8,915 +8,4 @@
|
|
|
//
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
-#ifndef _LIBCPP_EXPERIMENTAL_OPTIONAL
|
|
|
-#define _LIBCPP_EXPERIMENTAL_OPTIONAL
|
|
|
-
|
|
|
-/*
|
|
|
- optional synopsis
|
|
|
-
|
|
|
-// C++1y
|
|
|
-
|
|
|
-namespace std { namespace experimental { inline namespace fundamentals_v1 {
|
|
|
-
|
|
|
- // 5.3, optional for object types
|
|
|
- template <class T> class optional;
|
|
|
-
|
|
|
- // 5.4, In-place construction
|
|
|
- struct in_place_t{};
|
|
|
- constexpr in_place_t in_place{};
|
|
|
-
|
|
|
- // 5.5, No-value state indicator
|
|
|
- struct nullopt_t{see below};
|
|
|
- constexpr nullopt_t nullopt(unspecified);
|
|
|
-
|
|
|
- // 5.6, Class bad_optional_access
|
|
|
- class bad_optional_access;
|
|
|
-
|
|
|
- // 5.7, Relational operators
|
|
|
- template <class T>
|
|
|
- constexpr bool operator==(const optional<T>&, const optional<T>&);
|
|
|
- template <class T>
|
|
|
- constexpr bool operator!=(const optional<T>&, const optional<T>&);
|
|
|
- template <class T>
|
|
|
- constexpr bool operator<(const optional<T>&, const optional<T>&);
|
|
|
- template <class T>
|
|
|
- constexpr bool operator>(const optional<T>&, const optional<T>&);
|
|
|
- template <class T>
|
|
|
- constexpr bool operator<=(const optional<T>&, const optional<T>&);
|
|
|
- template <class T>
|
|
|
- constexpr bool operator>=(const optional<T>&, const optional<T>&);
|
|
|
-
|
|
|
- // 5.8, Comparison with nullopt
|
|
|
- template <class T> constexpr bool operator==(const optional<T>&, nullopt_t) noexcept;
|
|
|
- template <class T> constexpr bool operator==(nullopt_t, const optional<T>&) noexcept;
|
|
|
- template <class T> constexpr bool operator!=(const optional<T>&, nullopt_t) noexcept;
|
|
|
- template <class T> constexpr bool operator!=(nullopt_t, const optional<T>&) noexcept;
|
|
|
- template <class T> constexpr bool operator<(const optional<T>&, nullopt_t) noexcept;
|
|
|
- template <class T> constexpr bool operator<(nullopt_t, const optional<T>&) noexcept;
|
|
|
- template <class T> constexpr bool operator<=(const optional<T>&, nullopt_t) noexcept;
|
|
|
- template <class T> constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept;
|
|
|
- template <class T> constexpr bool operator>(const optional<T>&, nullopt_t) noexcept;
|
|
|
- template <class T> constexpr bool operator>(nullopt_t, const optional<T>&) noexcept;
|
|
|
- template <class T> constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept;
|
|
|
- template <class T> constexpr bool operator>=(nullopt_t, const optional<T>&) noexcept;
|
|
|
-
|
|
|
- // 5.9, Comparison with T
|
|
|
- template <class T> constexpr bool operator==(const optional<T>&, const T&);
|
|
|
- template <class T> constexpr bool operator==(const T&, const optional<T>&);
|
|
|
- template <class T> constexpr bool operator!=(const optional<T>&, const T&);
|
|
|
- template <class T> constexpr bool operator!=(const T&, const optional<T>&);
|
|
|
- template <class T> constexpr bool operator<(const optional<T>&, const T&);
|
|
|
- template <class T> constexpr bool operator<(const T&, const optional<T>&);
|
|
|
- template <class T> constexpr bool operator<=(const optional<T>&, const T&);
|
|
|
- template <class T> constexpr bool operator<=(const T&, const optional<T>&);
|
|
|
- template <class T> constexpr bool operator>(const optional<T>&, const T&);
|
|
|
- template <class T> constexpr bool operator>(const T&, const optional<T>&);
|
|
|
- template <class T> constexpr bool operator>=(const optional<T>&, const T&);
|
|
|
- template <class T> constexpr bool operator>=(const T&, const optional<T>&);
|
|
|
-
|
|
|
- // 5.10, Specialized algorithms
|
|
|
- template <class T> void swap(optional<T>&, optional<T>&) noexcept(see below);
|
|
|
- template <class T> constexpr optional<see below> make_optional(T&&);
|
|
|
-
|
|
|
- template <class T>
|
|
|
- class optional
|
|
|
- {
|
|
|
- public:
|
|
|
- typedef T value_type;
|
|
|
-
|
|
|
- // 5.3.1, Constructors
|
|
|
- constexpr optional() noexcept;
|
|
|
- constexpr optional(nullopt_t) noexcept;
|
|
|
- optional(const optional&);
|
|
|
- optional(optional&&) noexcept(see below);
|
|
|
- constexpr optional(const T&);
|
|
|
- constexpr optional(T&&);
|
|
|
- template <class... Args> constexpr explicit optional(in_place_t, Args&&...);
|
|
|
- template <class U, class... Args>
|
|
|
- constexpr explicit optional(in_place_t, initializer_list<U>, Args&&...);
|
|
|
-
|
|
|
- // 5.3.2, Destructor
|
|
|
- ~optional();
|
|
|
-
|
|
|
- // 5.3.3, Assignment
|
|
|
- optional& operator=(nullopt_t) noexcept;
|
|
|
- optional& operator=(const optional&);
|
|
|
- optional& operator=(optional&&) noexcept(see below);
|
|
|
- template <class U> optional& operator=(U&&);
|
|
|
- template <class... Args> void emplace(Args&&...);
|
|
|
- template <class U, class... Args>
|
|
|
- void emplace(initializer_list<U>, Args&&...);
|
|
|
-
|
|
|
- // 5.3.4, Swap
|
|
|
- void swap(optional&) noexcept(see below);
|
|
|
-
|
|
|
- // 5.3.5, Observers
|
|
|
- constexpr T const* operator ->() const;
|
|
|
- constexpr T* operator ->();
|
|
|
- constexpr T const& operator *() const &;
|
|
|
- constexpr T& operator *() &;
|
|
|
- constexpr T&& operator *() &&;
|
|
|
- constexpr const T&& operator *() const &&;
|
|
|
- constexpr explicit operator bool() const noexcept;
|
|
|
- constexpr T const& value() const &;
|
|
|
- constexpr T& value() &;
|
|
|
- constexpr T&& value() &&;
|
|
|
- constexpr const T&& value() const &&;
|
|
|
- template <class U> constexpr T value_or(U&&) const &;
|
|
|
- template <class U> constexpr T value_or(U&&) &&;
|
|
|
-
|
|
|
- private:
|
|
|
- T* val; // exposition only
|
|
|
- };
|
|
|
-
|
|
|
- } // namespace fundamentals_v1
|
|
|
- } // namespace experimental
|
|
|
-
|
|
|
- // 5.11, Hash support
|
|
|
- template <class T> struct hash;
|
|
|
- template <class T> struct hash<experimental::optional<T>>;
|
|
|
-
|
|
|
-} // namespace std
|
|
|
-
|
|
|
-*/
|
|
|
-
|
|
|
-#include <experimental/__config>
|
|
|
-#include <functional>
|
|
|
-#include <stdexcept>
|
|
|
-#if _LIBCPP_STD_VER > 11
|
|
|
-#include <initializer_list>
|
|
|
-#include <type_traits>
|
|
|
-#include <new>
|
|
|
-#include <__functional_base>
|
|
|
-#include <__debug>
|
|
|
-#endif
|
|
|
-
|
|
|
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
|
-#pragma GCC system_header
|
|
|
-#endif
|
|
|
-
|
|
|
-_LIBCPP_PUSH_MACROS
|
|
|
-#include <__undef_macros>
|
|
|
-
|
|
|
-
|
|
|
-_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL
|
|
|
-class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS bad_optional_access
|
|
|
- : public std::logic_error
|
|
|
-{
|
|
|
-public:
|
|
|
- bad_optional_access() : std::logic_error("Bad optional Access") {}
|
|
|
-
|
|
|
-// Get the key function ~bad_optional_access() into the dylib
|
|
|
- virtual ~bad_optional_access() _NOEXCEPT;
|
|
|
-};
|
|
|
-
|
|
|
-_LIBCPP_END_NAMESPACE_EXPERIMENTAL
|
|
|
-
|
|
|
-
|
|
|
-#if _LIBCPP_STD_VER > 11
|
|
|
-
|
|
|
-_LIBCPP_BEGIN_NAMESPACE_LFTS
|
|
|
-
|
|
|
-struct in_place_t {};
|
|
|
-constexpr in_place_t in_place{};
|
|
|
-
|
|
|
-struct nullopt_t
|
|
|
-{
|
|
|
- explicit constexpr nullopt_t(int) noexcept {}
|
|
|
-};
|
|
|
-
|
|
|
-constexpr nullopt_t nullopt{0};
|
|
|
-
|
|
|
-template <class _Tp, bool = is_trivially_destructible<_Tp>::value>
|
|
|
-class __optional_storage
|
|
|
-{
|
|
|
-protected:
|
|
|
- typedef _Tp value_type;
|
|
|
- union
|
|
|
- {
|
|
|
- char __null_state_;
|
|
|
- value_type __val_;
|
|
|
- };
|
|
|
- bool __engaged_ = false;
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- ~__optional_storage()
|
|
|
- {
|
|
|
- if (__engaged_)
|
|
|
- __val_.~value_type();
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr __optional_storage() noexcept
|
|
|
- : __null_state_('\0') {}
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- __optional_storage(const __optional_storage& __x)
|
|
|
- : __engaged_(__x.__engaged_)
|
|
|
- {
|
|
|
- if (__engaged_)
|
|
|
- ::new((void*)_VSTD::addressof(__val_)) value_type(__x.__val_);
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- __optional_storage(__optional_storage&& __x)
|
|
|
- noexcept(is_nothrow_move_constructible<value_type>::value)
|
|
|
- : __engaged_(__x.__engaged_)
|
|
|
- {
|
|
|
- if (__engaged_)
|
|
|
- ::new((void*)_VSTD::addressof(__val_)) value_type(_VSTD::move(__x.__val_));
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr __optional_storage(const value_type& __v)
|
|
|
- : __val_(__v),
|
|
|
- __engaged_(true) {}
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr __optional_storage(value_type&& __v)
|
|
|
- : __val_(_VSTD::move(__v)),
|
|
|
- __engaged_(true) {}
|
|
|
-
|
|
|
- template <class... _Args>
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr
|
|
|
- explicit __optional_storage(in_place_t, _Args&&... __args)
|
|
|
- : __val_(_VSTD::forward<_Args>(__args)...),
|
|
|
- __engaged_(true) {}
|
|
|
-};
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-class __optional_storage<_Tp, true>
|
|
|
-{
|
|
|
-protected:
|
|
|
- typedef _Tp value_type;
|
|
|
- union
|
|
|
- {
|
|
|
- char __null_state_;
|
|
|
- value_type __val_;
|
|
|
- };
|
|
|
- bool __engaged_ = false;
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr __optional_storage() noexcept
|
|
|
- : __null_state_('\0') {}
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- __optional_storage(const __optional_storage& __x)
|
|
|
- : __engaged_(__x.__engaged_)
|
|
|
- {
|
|
|
- if (__engaged_)
|
|
|
- ::new((void*)_VSTD::addressof(__val_)) value_type(__x.__val_);
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- __optional_storage(__optional_storage&& __x)
|
|
|
- noexcept(is_nothrow_move_constructible<value_type>::value)
|
|
|
- : __engaged_(__x.__engaged_)
|
|
|
- {
|
|
|
- if (__engaged_)
|
|
|
- ::new((void*)_VSTD::addressof(__val_)) value_type(_VSTD::move(__x.__val_));
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr __optional_storage(const value_type& __v)
|
|
|
- : __val_(__v),
|
|
|
- __engaged_(true) {}
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr __optional_storage(value_type&& __v)
|
|
|
- : __val_(_VSTD::move(__v)),
|
|
|
- __engaged_(true) {}
|
|
|
-
|
|
|
- template <class... _Args>
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr
|
|
|
- explicit __optional_storage(in_place_t, _Args&&... __args)
|
|
|
- : __val_(_VSTD::forward<_Args>(__args)...),
|
|
|
- __engaged_(true) {}
|
|
|
-};
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-class optional
|
|
|
- : private __optional_storage<_Tp>
|
|
|
-{
|
|
|
- typedef __optional_storage<_Tp> __base;
|
|
|
-public:
|
|
|
- typedef _Tp value_type;
|
|
|
-
|
|
|
- static_assert(!is_reference<value_type>::value,
|
|
|
- "Instantiation of optional with a reference type is ill-formed.");
|
|
|
- static_assert(!is_same<typename remove_cv<value_type>::type, in_place_t>::value,
|
|
|
- "Instantiation of optional with a in_place_t type is ill-formed.");
|
|
|
- static_assert(!is_same<typename remove_cv<value_type>::type, nullopt_t>::value,
|
|
|
- "Instantiation of optional with a nullopt_t type is ill-formed.");
|
|
|
- static_assert(is_object<value_type>::value,
|
|
|
- "Instantiation of optional with a non-object type is undefined behavior.");
|
|
|
- static_assert(is_nothrow_destructible<value_type>::value,
|
|
|
- "Instantiation of optional with an object type that is not noexcept destructible is undefined behavior.");
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY constexpr optional() noexcept {}
|
|
|
- _LIBCPP_INLINE_VISIBILITY optional(const optional&) = default;
|
|
|
- _LIBCPP_INLINE_VISIBILITY optional(optional&&) = default;
|
|
|
- _LIBCPP_INLINE_VISIBILITY ~optional() = default;
|
|
|
- _LIBCPP_INLINE_VISIBILITY constexpr optional(nullopt_t) noexcept {}
|
|
|
- _LIBCPP_INLINE_VISIBILITY constexpr optional(const value_type& __v)
|
|
|
- : __base(__v) {}
|
|
|
- _LIBCPP_INLINE_VISIBILITY constexpr optional(value_type&& __v)
|
|
|
- : __base(_VSTD::move(__v)) {}
|
|
|
-
|
|
|
- template <class... _Args,
|
|
|
- class = typename enable_if
|
|
|
- <
|
|
|
- is_constructible<value_type, _Args...>::value
|
|
|
- >::type
|
|
|
- >
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr
|
|
|
- explicit optional(in_place_t, _Args&&... __args)
|
|
|
- : __base(in_place, _VSTD::forward<_Args>(__args)...) {}
|
|
|
-
|
|
|
- template <class _Up, class... _Args,
|
|
|
- class = typename enable_if
|
|
|
- <
|
|
|
- is_constructible<value_type, initializer_list<_Up>&, _Args...>::value
|
|
|
- >::type
|
|
|
- >
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr
|
|
|
- explicit optional(in_place_t, initializer_list<_Up> __il, _Args&&... __args)
|
|
|
- : __base(in_place, __il, _VSTD::forward<_Args>(__args)...) {}
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- optional& operator=(nullopt_t) noexcept
|
|
|
- {
|
|
|
- if (this->__engaged_)
|
|
|
- {
|
|
|
- this->__val_.~value_type();
|
|
|
- this->__engaged_ = false;
|
|
|
- }
|
|
|
- return *this;
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- optional&
|
|
|
- operator=(const optional& __opt)
|
|
|
- {
|
|
|
- if (this->__engaged_ == __opt.__engaged_)
|
|
|
- {
|
|
|
- if (this->__engaged_)
|
|
|
- this->__val_ = __opt.__val_;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- if (this->__engaged_)
|
|
|
- this->__val_.~value_type();
|
|
|
- else
|
|
|
- ::new((void*)_VSTD::addressof(this->__val_)) value_type(__opt.__val_);
|
|
|
- this->__engaged_ = __opt.__engaged_;
|
|
|
- }
|
|
|
- return *this;
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- optional&
|
|
|
- operator=(optional&& __opt)
|
|
|
- noexcept(is_nothrow_move_assignable<value_type>::value &&
|
|
|
- is_nothrow_move_constructible<value_type>::value)
|
|
|
- {
|
|
|
- if (this->__engaged_ == __opt.__engaged_)
|
|
|
- {
|
|
|
- if (this->__engaged_)
|
|
|
- this->__val_ = _VSTD::move(__opt.__val_);
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- if (this->__engaged_)
|
|
|
- this->__val_.~value_type();
|
|
|
- else
|
|
|
- ::new((void*)_VSTD::addressof(this->__val_))
|
|
|
- value_type(_VSTD::move(__opt.__val_));
|
|
|
- this->__engaged_ = __opt.__engaged_;
|
|
|
- }
|
|
|
- return *this;
|
|
|
- }
|
|
|
-
|
|
|
- template <class _Up,
|
|
|
- class = typename enable_if
|
|
|
- <
|
|
|
- is_same<typename remove_reference<_Up>::type, value_type>::value &&
|
|
|
- is_constructible<value_type, _Up>::value &&
|
|
|
- is_assignable<value_type&, _Up>::value
|
|
|
- >::type
|
|
|
- >
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- optional&
|
|
|
- operator=(_Up&& __v)
|
|
|
- {
|
|
|
- if (this->__engaged_)
|
|
|
- this->__val_ = _VSTD::forward<_Up>(__v);
|
|
|
- else
|
|
|
- {
|
|
|
- ::new((void*)_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Up>(__v));
|
|
|
- this->__engaged_ = true;
|
|
|
- }
|
|
|
- return *this;
|
|
|
- }
|
|
|
-
|
|
|
- template <class... _Args,
|
|
|
- class = typename enable_if
|
|
|
- <
|
|
|
- is_constructible<value_type, _Args...>::value
|
|
|
- >::type
|
|
|
- >
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- void
|
|
|
- emplace(_Args&&... __args)
|
|
|
- {
|
|
|
- *this = nullopt;
|
|
|
- ::new((void*)_VSTD::addressof(this->__val_))
|
|
|
- value_type(_VSTD::forward<_Args>(__args)...);
|
|
|
- this->__engaged_ = true;
|
|
|
- }
|
|
|
-
|
|
|
- template <class _Up, class... _Args,
|
|
|
- class = typename enable_if
|
|
|
- <
|
|
|
- is_constructible<value_type, initializer_list<_Up>&, _Args...>::value
|
|
|
- >::type
|
|
|
- >
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- void
|
|
|
- emplace(initializer_list<_Up> __il, _Args&&... __args)
|
|
|
- {
|
|
|
- *this = nullopt;
|
|
|
- ::new((void*)_VSTD::addressof(this->__val_))
|
|
|
- value_type(__il, _VSTD::forward<_Args>(__args)...);
|
|
|
- this->__engaged_ = true;
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- void
|
|
|
- swap(optional& __opt)
|
|
|
- noexcept(is_nothrow_move_constructible<value_type>::value &&
|
|
|
- __is_nothrow_swappable<value_type>::value)
|
|
|
- {
|
|
|
- using _VSTD::swap;
|
|
|
- if (this->__engaged_ == __opt.__engaged_)
|
|
|
- {
|
|
|
- if (this->__engaged_)
|
|
|
- swap(this->__val_, __opt.__val_);
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- if (this->__engaged_)
|
|
|
- {
|
|
|
- ::new((void*)_VSTD::addressof(__opt.__val_))
|
|
|
- value_type(_VSTD::move(this->__val_));
|
|
|
- this->__val_.~value_type();
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- ::new((void*)_VSTD::addressof(this->__val_))
|
|
|
- value_type(_VSTD::move(__opt.__val_));
|
|
|
- __opt.__val_.~value_type();
|
|
|
- }
|
|
|
- swap(this->__engaged_, __opt.__engaged_);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr
|
|
|
- value_type const*
|
|
|
- operator->() const
|
|
|
- {
|
|
|
- _LIBCPP_ASSERT(this->__engaged_, "optional operator-> called for disengaged value");
|
|
|
-#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
|
|
|
- return __builtin_addressof(this->__val_);
|
|
|
-#else
|
|
|
- return __operator_arrow(__has_operator_addressof<value_type>{});
|
|
|
-#endif
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- value_type*
|
|
|
- operator->()
|
|
|
- {
|
|
|
- _LIBCPP_ASSERT(this->__engaged_, "optional operator-> called for disengaged value");
|
|
|
- return _VSTD::addressof(this->__val_);
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr
|
|
|
- const value_type&
|
|
|
- operator*() const
|
|
|
- {
|
|
|
- _LIBCPP_ASSERT(this->__engaged_, "optional operator* called for disengaged value");
|
|
|
- return this->__val_;
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- value_type&
|
|
|
- operator*()
|
|
|
- {
|
|
|
- _LIBCPP_ASSERT(this->__engaged_, "optional operator* called for disengaged value");
|
|
|
- return this->__val_;
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr explicit operator bool() const noexcept {return this->__engaged_;}
|
|
|
-
|
|
|
- _LIBCPP_NORETURN _LIBCPP_INLINE_VISIBILITY
|
|
|
-#ifndef _LIBCPP_NO_EXCEPTIONS
|
|
|
-_LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
|
|
|
-#endif
|
|
|
- constexpr void __throw_bad_optional_access() const
|
|
|
- {
|
|
|
-#ifndef _LIBCPP_NO_EXCEPTIONS
|
|
|
- throw bad_optional_access();
|
|
|
-#else
|
|
|
- _VSTD::abort();
|
|
|
-#endif
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
|
|
|
- constexpr value_type const& value() const
|
|
|
- {
|
|
|
- if (!this->__engaged_)
|
|
|
- __throw_bad_optional_access();
|
|
|
- return this->__val_;
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
|
|
|
- value_type& value()
|
|
|
- {
|
|
|
- if (!this->__engaged_)
|
|
|
- __throw_bad_optional_access();
|
|
|
- return this->__val_;
|
|
|
- }
|
|
|
-
|
|
|
- template <class _Up>
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr value_type value_or(_Up&& __v) const&
|
|
|
- {
|
|
|
- static_assert(is_copy_constructible<value_type>::value,
|
|
|
- "optional<T>::value_or: T must be copy constructible");
|
|
|
- static_assert(is_convertible<_Up, value_type>::value,
|
|
|
- "optional<T>::value_or: U must be convertible to T");
|
|
|
- return this->__engaged_ ? this->__val_ :
|
|
|
- static_cast<value_type>(_VSTD::forward<_Up>(__v));
|
|
|
- }
|
|
|
-
|
|
|
- template <class _Up>
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- value_type value_or(_Up&& __v) &&
|
|
|
- {
|
|
|
- static_assert(is_move_constructible<value_type>::value,
|
|
|
- "optional<T>::value_or: T must be move constructible");
|
|
|
- static_assert(is_convertible<_Up, value_type>::value,
|
|
|
- "optional<T>::value_or: U must be convertible to T");
|
|
|
- return this->__engaged_ ? _VSTD::move(this->__val_) :
|
|
|
- static_cast<value_type>(_VSTD::forward<_Up>(__v));
|
|
|
- }
|
|
|
-
|
|
|
-private:
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- value_type const*
|
|
|
- __operator_arrow(true_type) const
|
|
|
- {
|
|
|
- return _VSTD::addressof(this->__val_);
|
|
|
- }
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- constexpr
|
|
|
- value_type const*
|
|
|
- __operator_arrow(false_type) const
|
|
|
- {
|
|
|
- return &this->__val_;
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-// Comparisons between optionals
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator==(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
-{
|
|
|
- if (static_cast<bool>(__x) != static_cast<bool>(__y))
|
|
|
- return false;
|
|
|
- if (!static_cast<bool>(__x))
|
|
|
- return true;
|
|
|
- return *__x == *__y;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator!=(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
-{
|
|
|
- return !(__x == __y);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
-{
|
|
|
- if (!static_cast<bool>(__y))
|
|
|
- return false;
|
|
|
- if (!static_cast<bool>(__x))
|
|
|
- return true;
|
|
|
- return *__x < *__y;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
-{
|
|
|
- return __y < __x;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<=(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
-{
|
|
|
- return !(__y < __x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>=(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
-{
|
|
|
- return !(__x < __y);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-// Comparisons with nullopt
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator==(const optional<_Tp>& __x, nullopt_t) noexcept
|
|
|
-{
|
|
|
- return !static_cast<bool>(__x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator==(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
-{
|
|
|
- return !static_cast<bool>(__x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator!=(const optional<_Tp>& __x, nullopt_t) noexcept
|
|
|
-{
|
|
|
- return static_cast<bool>(__x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator!=(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
-{
|
|
|
- return static_cast<bool>(__x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<(const optional<_Tp>&, nullopt_t) noexcept
|
|
|
-{
|
|
|
- return false;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
-{
|
|
|
- return static_cast<bool>(__x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<=(const optional<_Tp>& __x, nullopt_t) noexcept
|
|
|
-{
|
|
|
- return !static_cast<bool>(__x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<=(nullopt_t, const optional<_Tp>&) noexcept
|
|
|
-{
|
|
|
- return true;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>(const optional<_Tp>& __x, nullopt_t) noexcept
|
|
|
-{
|
|
|
- return static_cast<bool>(__x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>(nullopt_t, const optional<_Tp>&) noexcept
|
|
|
-{
|
|
|
- return false;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>=(const optional<_Tp>&, nullopt_t) noexcept
|
|
|
-{
|
|
|
- return true;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>=(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
-{
|
|
|
- return !static_cast<bool>(__x);
|
|
|
-}
|
|
|
-
|
|
|
-// Comparisons with T
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator==(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
-{
|
|
|
- return static_cast<bool>(__x) ? *__x == __v : false;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator==(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
-{
|
|
|
- return static_cast<bool>(__x) ? *__x == __v : false;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator!=(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
-{
|
|
|
- return static_cast<bool>(__x) ? !(*__x == __v) : true;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator!=(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
-{
|
|
|
- return static_cast<bool>(__x) ? !(*__x == __v) : true;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
-{
|
|
|
- return static_cast<bool>(__x) ? less<_Tp>{}(*__x, __v) : true;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
-{
|
|
|
- return static_cast<bool>(__x) ? less<_Tp>{}(__v, *__x) : false;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<=(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
-{
|
|
|
- return !(__x > __v);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator<=(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
-{
|
|
|
- return !(__v > __x);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
-{
|
|
|
- return static_cast<bool>(__x) ? __v < __x : false;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
-{
|
|
|
- return static_cast<bool>(__x) ? __x < __v : true;
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>=(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
-{
|
|
|
- return !(__x < __v);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-bool
|
|
|
-operator>=(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
-{
|
|
|
- return !(__v < __x);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-void
|
|
|
-swap(optional<_Tp>& __x, optional<_Tp>& __y) noexcept(noexcept(__x.swap(__y)))
|
|
|
-{
|
|
|
- __x.swap(__y);
|
|
|
-}
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
-constexpr
|
|
|
-optional<typename decay<_Tp>::type>
|
|
|
-make_optional(_Tp&& __v)
|
|
|
-{
|
|
|
- return optional<typename decay<_Tp>::type>(_VSTD::forward<_Tp>(__v));
|
|
|
-}
|
|
|
-
|
|
|
-_LIBCPP_END_NAMESPACE_LFTS
|
|
|
-
|
|
|
-_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
-
|
|
|
-template <class _Tp>
|
|
|
-struct _LIBCPP_TEMPLATE_VIS hash<std::experimental::optional<_Tp> >
|
|
|
-{
|
|
|
- typedef std::experimental::optional<_Tp> argument_type;
|
|
|
- typedef size_t result_type;
|
|
|
-
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
- result_type operator()(const argument_type& __opt) const _NOEXCEPT
|
|
|
- {
|
|
|
- return static_cast<bool>(__opt) ? hash<_Tp>()(*__opt) : 0;
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-_LIBCPP_END_NAMESPACE_STD
|
|
|
-
|
|
|
-#endif // _LIBCPP_STD_VER > 11
|
|
|
-
|
|
|
-_LIBCPP_POP_MACROS
|
|
|
-
|
|
|
-#endif // _LIBCPP_EXPERIMENTAL_OPTIONAL
|
|
|
+#error "<experimental/optional> has been removed. Use <optional> instead."
|