|
@@ -1,1318 +0,0 @@
|
|
-// -*- C++ -*-
|
|
|
|
-//===-------------------------- optional ----------------------------------===//
|
|
|
|
-//
|
|
|
|
-// The LLVM Compiler Infrastructure
|
|
|
|
-//
|
|
|
|
-// This file is dual licensed under the MIT and the University of Illinois Open
|
|
|
|
-// Source Licenses. See LICENSE.TXT for details.
|
|
|
|
-//
|
|
|
|
-//===----------------------------------------------------------------------===//
|
|
|
|
-
|
|
|
|
-#ifndef _LIBCPP_OPTIONAL
|
|
|
|
-#define _LIBCPP_OPTIONAL
|
|
|
|
-
|
|
|
|
-/*
|
|
|
|
- optional synopsis
|
|
|
|
-
|
|
|
|
-// C++1z
|
|
|
|
-
|
|
|
|
-namespace std {
|
|
|
|
- // 20.6.3, optional for object types
|
|
|
|
- template <class T> class optional;
|
|
|
|
-
|
|
|
|
- // 20.6.4, no-value state indicator
|
|
|
|
- struct nullopt_t{see below };
|
|
|
|
- constexpr nullopt_t nullopt(unspecified );
|
|
|
|
-
|
|
|
|
- // 20.6.5, class bad_optional_access
|
|
|
|
- class bad_optional_access;
|
|
|
|
-
|
|
|
|
- // 20.6.6, 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>&);
|
|
|
|
- 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;
|
|
|
|
-
|
|
|
|
- // 20.6.8, 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>&);
|
|
|
|
-
|
|
|
|
- // 20.6.9, 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... Args>
|
|
|
|
- constexpr optional<T> make_optional(Args&&... args);
|
|
|
|
- template <class T, class U, class... Args>
|
|
|
|
- constexpr optional<T> make_optional(initializer_list<U> il, Args&&... args);
|
|
|
|
-
|
|
|
|
- // 20.6.10, hash support
|
|
|
|
- template <class T> struct hash;
|
|
|
|
- template <class T> struct hash<optional<T>>;
|
|
|
|
-
|
|
|
|
- template <class T> class optional {
|
|
|
|
- public:
|
|
|
|
- using value_type = T;
|
|
|
|
-
|
|
|
|
- // 20.6.3.1, constructors
|
|
|
|
- constexpr optional() noexcept;
|
|
|
|
- constexpr optional(nullopt_t) noexcept;
|
|
|
|
- optional(const optional &);
|
|
|
|
- optional(optional &&) noexcept(see below );
|
|
|
|
- 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 &&...);
|
|
|
|
- template <class U = T>
|
|
|
|
- constexpr EXPLICIT optional(U &&);
|
|
|
|
- template <class U>
|
|
|
|
- constexpr EXPLICIT optional(const optional<U> &);
|
|
|
|
- template <class U>
|
|
|
|
- constexpr EXPLICIT optional(optional<U> &&);
|
|
|
|
-
|
|
|
|
- // 20.6.3.2, destructor
|
|
|
|
- ~optional();
|
|
|
|
-
|
|
|
|
- // 20.6.3.3, assignment
|
|
|
|
- optional &operator=(nullopt_t) noexcept;
|
|
|
|
- optional &operator=(const optional &);
|
|
|
|
- optional &operator=(optional &&) noexcept(see below );
|
|
|
|
- template <class U = T> optional &operator=(U &&);
|
|
|
|
- template <class U> optional &operator=(const optional<U> &);
|
|
|
|
- template <class U> optional &operator=(optional<U> &&);
|
|
|
|
- template <class... Args> void emplace(Args &&...);
|
|
|
|
- template <class U, class... Args>
|
|
|
|
- void emplace(initializer_list<U>, Args &&...);
|
|
|
|
-
|
|
|
|
- // 20.6.3.4, swap
|
|
|
|
- void swap(optional &) noexcept(see below );
|
|
|
|
-
|
|
|
|
- // 20.6.3.5, 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 bool has_value() 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 &&) &&;
|
|
|
|
-
|
|
|
|
- // 20.6.3.6, modifiers
|
|
|
|
- void reset() noexcept;
|
|
|
|
-
|
|
|
|
- private:
|
|
|
|
- T *val; // exposition only
|
|
|
|
- };
|
|
|
|
-} // namespace std
|
|
|
|
-
|
|
|
|
-*/
|
|
|
|
-
|
|
|
|
-#include <__config>
|
|
|
|
-#include <__debug>
|
|
|
|
-#include <__functional_base>
|
|
|
|
-#include <__undef_min_max>
|
|
|
|
-#include <functional>
|
|
|
|
-#include <initializer_list>
|
|
|
|
-#include <new>
|
|
|
|
-#include <stdexcept>
|
|
|
|
-#include <type_traits>
|
|
|
|
-#include <utility>
|
|
|
|
-
|
|
|
|
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
|
|
-#pragma GCC system_header
|
|
|
|
-#endif
|
|
|
|
-
|
|
|
|
-namespace std // purposefully not using versioning namespace
|
|
|
|
-{
|
|
|
|
-
|
|
|
|
-class _LIBCPP_EXCEPTION_ABI bad_optional_access
|
|
|
|
- : public logic_error
|
|
|
|
-{
|
|
|
|
-public:
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- bad_optional_access() : logic_error("bad optional access") {}
|
|
|
|
-
|
|
|
|
- // Get the key function ~bad_optional_access() into the dylib
|
|
|
|
- _LIBCPP_FUNC_VIS
|
|
|
|
- virtual ~bad_optional_access() _NOEXCEPT;
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-} // std
|
|
|
|
-
|
|
|
|
-#if _LIBCPP_STD_VER > 14
|
|
|
|
-
|
|
|
|
-_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
-
|
|
|
|
-_LIBCPP_NORETURN
|
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
|
-void __throw_bad_optional_access() {
|
|
|
|
-#ifndef _LIBCPP_NO_EXCEPTIONS
|
|
|
|
- throw bad_optional_access();
|
|
|
|
-#else
|
|
|
|
- _VSTD::abort();
|
|
|
|
-#endif
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-struct nullopt_t
|
|
|
|
-{
|
|
|
|
- struct __secret_tag { _LIBCPP_INLINE_VISIBILITY explicit __secret_tag() = default; };
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY constexpr explicit nullopt_t(__secret_tag, __secret_tag) noexcept {}
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-/* inline */ constexpr nullopt_t nullopt{nullopt_t::__secret_tag{}, nullopt_t::__secret_tag{}};
|
|
|
|
-
|
|
|
|
-template <class _Tp, bool = is_trivially_destructible<_Tp>::value>
|
|
|
|
-struct __optional_destruct_base;
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-struct __optional_destruct_base<_Tp, false>
|
|
|
|
-{
|
|
|
|
- typedef _Tp value_type;
|
|
|
|
- static_assert(is_object_v<value_type>,
|
|
|
|
- "instantiation of optional with a non-object type is undefined behavior");
|
|
|
|
- union
|
|
|
|
- {
|
|
|
|
- char __null_state_;
|
|
|
|
- value_type __val_;
|
|
|
|
- };
|
|
|
|
- bool __engaged_;
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- ~__optional_destruct_base()
|
|
|
|
- {
|
|
|
|
- if (__engaged_)
|
|
|
|
- __val_.~value_type();
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr __optional_destruct_base() noexcept
|
|
|
|
- : __null_state_(),
|
|
|
|
- __engaged_(false) {}
|
|
|
|
-
|
|
|
|
- template <class... _Args>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr explicit __optional_destruct_base(in_place_t, _Args&&... __args)
|
|
|
|
- : __val_(_VSTD::forward<_Args>(__args)...),
|
|
|
|
- __engaged_(true) {}
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void reset() noexcept
|
|
|
|
- {
|
|
|
|
- if (__engaged_)
|
|
|
|
- {
|
|
|
|
- __val_.~value_type();
|
|
|
|
- __engaged_ = false;
|
|
|
|
- }
|
|
|
|
- }
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-struct __optional_destruct_base<_Tp, true>
|
|
|
|
-{
|
|
|
|
- typedef _Tp value_type;
|
|
|
|
- static_assert(is_object_v<value_type>,
|
|
|
|
- "instantiation of optional with a non-object type is undefined behavior");
|
|
|
|
- union
|
|
|
|
- {
|
|
|
|
- char __null_state_;
|
|
|
|
- value_type __val_;
|
|
|
|
- };
|
|
|
|
- bool __engaged_;
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr __optional_destruct_base() noexcept
|
|
|
|
- : __null_state_(),
|
|
|
|
- __engaged_(false) {}
|
|
|
|
-
|
|
|
|
- template <class... _Args>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr explicit __optional_destruct_base(in_place_t, _Args&&... __args)
|
|
|
|
- : __val_(_VSTD::forward<_Args>(__args)...),
|
|
|
|
- __engaged_(true) {}
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void reset() noexcept
|
|
|
|
- {
|
|
|
|
- if (__engaged_)
|
|
|
|
- {
|
|
|
|
- __engaged_ = false;
|
|
|
|
- }
|
|
|
|
- }
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-template <class _Tp, bool = is_reference<_Tp>::value>
|
|
|
|
-struct __optional_storage_base : __optional_destruct_base<_Tp>
|
|
|
|
-{
|
|
|
|
- using __base = __optional_destruct_base<_Tp>;
|
|
|
|
- using value_type = _Tp;
|
|
|
|
- using __base::__base;
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr bool has_value() const noexcept
|
|
|
|
- {
|
|
|
|
- return this->__engaged_;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type& __get() & noexcept
|
|
|
|
- {
|
|
|
|
- return this->__val_;
|
|
|
|
- }
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr const value_type& __get() const& noexcept
|
|
|
|
- {
|
|
|
|
- return this->__val_;
|
|
|
|
- }
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type&& __get() && noexcept
|
|
|
|
- {
|
|
|
|
- return _VSTD::move(this->__val_);
|
|
|
|
- }
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr const value_type&& __get() const&& noexcept
|
|
|
|
- {
|
|
|
|
- return _VSTD::move(this->__val_);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class... _Args>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void __construct(_Args&&... __args)
|
|
|
|
- {
|
|
|
|
- _LIBCPP_ASSERT(!has_value(), "__construct called for engaged __optional_storage");
|
|
|
|
- ::new((void*)_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Args>(__args)...);
|
|
|
|
- this->__engaged_ = true;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class _That>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void __construct_from(_That&& __opt)
|
|
|
|
- {
|
|
|
|
- if (__opt.has_value())
|
|
|
|
- __construct(_VSTD::forward<_That>(__opt).__get());
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class _That>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void __assign_from(_That&& __opt)
|
|
|
|
- {
|
|
|
|
- if (this->__engaged_ == __opt.has_value())
|
|
|
|
- {
|
|
|
|
- if (this->__engaged_)
|
|
|
|
- this->__val_ = _VSTD::forward<_That>(__opt).__get();
|
|
|
|
- }
|
|
|
|
- else
|
|
|
|
- {
|
|
|
|
- if (this->__engaged_)
|
|
|
|
- this->reset();
|
|
|
|
- else
|
|
|
|
- __construct(_VSTD::forward<_That>(__opt).__get());
|
|
|
|
- }
|
|
|
|
- }
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-// optional<T&> is currently required ill-formed, however it may to be in the
|
|
|
|
-// future. For this reason it has already been implemented to ensure we can
|
|
|
|
-// make the change in an ABI compatible manner.
|
|
|
|
-template <class _Tp>
|
|
|
|
-struct __optional_storage_base<_Tp, true>
|
|
|
|
-{
|
|
|
|
- using value_type = _Tp;
|
|
|
|
- using __raw_type = remove_reference_t<_Tp>;
|
|
|
|
- __raw_type* __value_;
|
|
|
|
-
|
|
|
|
- template <class _Up>
|
|
|
|
- static constexpr bool __can_bind_reference() {
|
|
|
|
- using _RawUp = typename remove_reference<_Up>::type;
|
|
|
|
- using _UpPtr = _RawUp*;
|
|
|
|
- using _RawTp = typename remove_reference<_Tp>::type;
|
|
|
|
- using _TpPtr = _RawTp*;
|
|
|
|
- using _CheckLValueArg = integral_constant<bool,
|
|
|
|
- (is_lvalue_reference<_Up>::value && is_convertible<_UpPtr, _TpPtr>::value)
|
|
|
|
- || is_same<_RawUp, reference_wrapper<_RawTp>>::value
|
|
|
|
- || is_same<_RawUp, reference_wrapper<typename remove_const<_RawTp>::type>>::value
|
|
|
|
- >;
|
|
|
|
- return (is_lvalue_reference<_Tp>::value && _CheckLValueArg::value)
|
|
|
|
- || (is_rvalue_reference<_Tp>::value && !is_lvalue_reference<_Up>::value &&
|
|
|
|
- is_convertible<_UpPtr, _TpPtr>::value);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr __optional_storage_base() noexcept
|
|
|
|
- : __value_(nullptr) {}
|
|
|
|
-
|
|
|
|
- template <class _UArg>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr explicit __optional_storage_base(in_place_t, _UArg&& __uarg)
|
|
|
|
- : __value_(_VSTD::addressof(__uarg))
|
|
|
|
- {
|
|
|
|
- static_assert(__can_bind_reference<_UArg>(),
|
|
|
|
- "Attempted to construct a reference element in tuple from a "
|
|
|
|
- "possible temporary");
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void reset() noexcept { __value_ = nullptr; }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr bool has_value() const noexcept
|
|
|
|
- { return __value_ != nullptr; }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type& __get() const& noexcept
|
|
|
|
- { return *__value_; }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type&& __get() const&& noexcept
|
|
|
|
- { return _VSTD::forward<value_type>(*__value_); }
|
|
|
|
-
|
|
|
|
- template <class _UArg>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void __construct(_UArg&& __val)
|
|
|
|
- {
|
|
|
|
- _LIBCPP_ASSERT(!has_value(), "__construct called for engaged __optional_storage");
|
|
|
|
- static_assert(__can_bind_reference<_UArg>(),
|
|
|
|
- "Attempted to construct a reference element in tuple from a "
|
|
|
|
- "possible temporary");
|
|
|
|
- __value_ = _VSTD::addressof(__val);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class _That>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void __construct_from(_That&& __opt)
|
|
|
|
- {
|
|
|
|
- if (__opt.has_value())
|
|
|
|
- __construct(_VSTD::forward<_That>(__opt).__get());
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class _That>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void __assign_from(_That&& __opt)
|
|
|
|
- {
|
|
|
|
- if (has_value() == __opt.has_value())
|
|
|
|
- {
|
|
|
|
- if (has_value())
|
|
|
|
- *__value_ = _VSTD::forward<_That>(__opt).__get();
|
|
|
|
- }
|
|
|
|
- else
|
|
|
|
- {
|
|
|
|
- if (has_value())
|
|
|
|
- reset();
|
|
|
|
- else
|
|
|
|
- __construct(_VSTD::forward<_That>(__opt).__get());
|
|
|
|
- }
|
|
|
|
- }
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-template <class _Tp, bool = is_trivially_copyable<_Tp>::value>
|
|
|
|
-struct __optional_storage;
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-struct __optional_storage<_Tp, true> : __optional_storage_base<_Tp>
|
|
|
|
-{
|
|
|
|
- using __optional_storage_base<_Tp>::__optional_storage_base;
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-struct __optional_storage<_Tp, false> : __optional_storage_base<_Tp>
|
|
|
|
-{
|
|
|
|
- using value_type = _Tp;
|
|
|
|
- using __optional_storage_base<_Tp>::__optional_storage_base;
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- __optional_storage() = default;
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- __optional_storage(const __optional_storage& __opt)
|
|
|
|
- {
|
|
|
|
- this->__construct_from(__opt);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- __optional_storage(__optional_storage&& __opt)
|
|
|
|
- noexcept(is_nothrow_move_constructible_v<value_type>)
|
|
|
|
- {
|
|
|
|
- this->__construct_from(_VSTD::move(__opt));
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- __optional_storage& operator=(const __optional_storage& __opt)
|
|
|
|
- {
|
|
|
|
- this->__assign_from(__opt);
|
|
|
|
- return *this;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- __optional_storage& operator=(__optional_storage&& __opt)
|
|
|
|
- noexcept(is_nothrow_move_assignable_v<value_type> &&
|
|
|
|
- is_nothrow_move_constructible_v<value_type>)
|
|
|
|
- {
|
|
|
|
- this->__assign_from(_VSTD::move(__opt));
|
|
|
|
- return *this;
|
|
|
|
- }
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-using __optional_sfinae_ctor_base_t = __sfinae_ctor_base<
|
|
|
|
- is_copy_constructible<_Tp>::value,
|
|
|
|
- is_move_constructible<_Tp>::value
|
|
|
|
->;
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-using __optional_sfinae_assign_base_t = __sfinae_assign_base<
|
|
|
|
- (is_copy_constructible<_Tp>::value && is_copy_assignable<_Tp>::value),
|
|
|
|
- (is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value) ||
|
|
|
|
- (is_copy_constructible<_Tp>::value && is_copy_assignable<_Tp>::value)
|
|
|
|
->;
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-class optional
|
|
|
|
- : private __optional_storage<_Tp>
|
|
|
|
- , private __optional_sfinae_ctor_base_t<_Tp>
|
|
|
|
- , private __optional_sfinae_assign_base_t<_Tp>
|
|
|
|
-{
|
|
|
|
- using __base = __optional_storage<_Tp>;
|
|
|
|
-public:
|
|
|
|
- using value_type = _Tp;
|
|
|
|
-
|
|
|
|
-private:
|
|
|
|
- // Disable the reference extension using this static assert.
|
|
|
|
- static_assert(!is_same_v<value_type, in_place_t>,
|
|
|
|
- "instantiation of optional with in_place_t is ill-formed");
|
|
|
|
- static_assert(!is_same_v<__uncvref_t<value_type>, nullopt_t>,
|
|
|
|
- "instantiation of optional with nullopt_t is ill-formed");
|
|
|
|
- static_assert(!is_reference_v<value_type>,
|
|
|
|
- "instantiation of optional with a reference type is ill-formed");
|
|
|
|
- static_assert(is_destructible_v<value_type>,
|
|
|
|
- "instantiation of optional with a non-destructible type is ill-formed");
|
|
|
|
-
|
|
|
|
- // LWG2756: conditionally explicit conversion from _Up
|
|
|
|
- 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 = conditional_t<
|
|
|
|
- !is_same_v<in_place_t, _Up> &&
|
|
|
|
- !is_same_v<decay_t<_Up>, optional>,
|
|
|
|
- _CheckOptionalArgsConstructor,
|
|
|
|
- __check_tuple_constructor_fail
|
|
|
|
- >;
|
|
|
|
- template <class _QualUp>
|
|
|
|
- struct _CheckOptionalLikeConstructor {
|
|
|
|
- template <class _Up, class _Opt = optional<_Up>>
|
|
|
|
- using __check_constructible_from_opt = __lazy_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 _Opt = optional<_Up>>
|
|
|
|
- using __check_assignable_from_opt = __lazy_or<
|
|
|
|
- is_assignable<_Tp&, _Opt&>,
|
|
|
|
- is_assignable<_Tp&, _Opt const&>,
|
|
|
|
- is_assignable<_Tp&, _Opt&&>,
|
|
|
|
- is_assignable<_Tp&, _Opt const&&>
|
|
|
|
- >;
|
|
|
|
- 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 _QUp = _QualUp>
|
|
|
|
- static constexpr bool __enable_assign() {
|
|
|
|
- // Construction and assignability of _Qup to _Tp has already been
|
|
|
|
- // checked.
|
|
|
|
- return !__check_constructible_from_opt<_Up>::value &&
|
|
|
|
- !__check_assignable_from_opt<_Up>::value;
|
|
|
|
- }
|
|
|
|
- };
|
|
|
|
-
|
|
|
|
- template <class _Up, class _QualUp>
|
|
|
|
- using _CheckOptionalLikeCtor = conditional_t<
|
|
|
|
- __lazy_and<
|
|
|
|
- __lazy_not<is_same<_Up, _Tp>>,
|
|
|
|
- is_constructible<_Tp, _QualUp>
|
|
|
|
- >::value,
|
|
|
|
- _CheckOptionalLikeConstructor<_QualUp>,
|
|
|
|
- __check_tuple_constructor_fail
|
|
|
|
- >;
|
|
|
|
- template <class _Up, class _QualUp>
|
|
|
|
- using _CheckOptionalLikeAssign = conditional_t<
|
|
|
|
- __lazy_and<
|
|
|
|
- __lazy_not<is_same<_Up, _Tp>>,
|
|
|
|
- is_constructible<_Tp, _QualUp>,
|
|
|
|
- is_assignable<_Tp&, _QualUp>
|
|
|
|
- >::value,
|
|
|
|
- _CheckOptionalLikeConstructor<_QualUp>,
|
|
|
|
- __check_tuple_constructor_fail
|
|
|
|
- >;
|
|
|
|
-public:
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY constexpr optional() noexcept {}
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY optional(const optional&) = default;
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY optional(optional&&) = default;
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY constexpr optional(nullopt_t) noexcept {}
|
|
|
|
-
|
|
|
|
- template <class... _Args, class = enable_if_t<
|
|
|
|
- is_constructible_v<value_type, _Args...>>
|
|
|
|
- >
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr explicit optional(in_place_t, _Args&&... __args)
|
|
|
|
- : __base(in_place, _VSTD::forward<_Args>(__args)...) {}
|
|
|
|
-
|
|
|
|
- template <class _Up, class... _Args, class = enable_if_t<
|
|
|
|
- is_constructible_v<value_type, initializer_list<_Up>&, _Args...>>
|
|
|
|
- >
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr explicit optional(in_place_t, initializer_list<_Up> __il, _Args&&... __args)
|
|
|
|
- : __base(in_place, __il, _VSTD::forward<_Args>(__args)...) {}
|
|
|
|
-
|
|
|
|
- template <class _Up = value_type, enable_if_t<
|
|
|
|
- _CheckOptionalArgsCtor<_Up>::template __enable_implicit<_Up>()
|
|
|
|
- , int> = 0>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr optional(_Up&& __v)
|
|
|
|
- : __base(in_place, _VSTD::forward<_Up>(__v)) {}
|
|
|
|
-
|
|
|
|
- template <class _Up, enable_if_t<
|
|
|
|
- _CheckOptionalArgsCtor<_Up>::template __enable_explicit<_Up>()
|
|
|
|
- , int> = 0>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr explicit optional(_Up&& __v)
|
|
|
|
- : __base(in_place, _VSTD::forward<_Up>(__v)) {}
|
|
|
|
-
|
|
|
|
- // LWG2756: conditionally explicit conversion from const optional<_Up>&
|
|
|
|
- template <class _Up, enable_if_t<
|
|
|
|
- _CheckOptionalLikeCtor<_Up, _Up const&>::template __enable_implicit<_Up>()
|
|
|
|
- , int> = 0>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- optional(const optional<_Up>& __v)
|
|
|
|
- {
|
|
|
|
- this->__construct_from(__v);
|
|
|
|
- }
|
|
|
|
- template <class _Up, enable_if_t<
|
|
|
|
- _CheckOptionalLikeCtor<_Up, _Up const&>::template __enable_explicit<_Up>()
|
|
|
|
- , int> = 0>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- explicit optional(const optional<_Up>& __v)
|
|
|
|
- {
|
|
|
|
- this->__construct_from(__v);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- // LWG2756: conditionally explicit conversion from optional<_Up>&&
|
|
|
|
- template <class _Up, enable_if_t<
|
|
|
|
- _CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_implicit<_Up>()
|
|
|
|
- , int> = 0>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- optional(optional<_Up>&& __v)
|
|
|
|
- {
|
|
|
|
- this->__construct_from(_VSTD::move(__v));
|
|
|
|
- }
|
|
|
|
- template <class _Up, enable_if_t<
|
|
|
|
- _CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_explicit<_Up>()
|
|
|
|
- , int> = 0>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- explicit optional(optional<_Up>&& __v)
|
|
|
|
- {
|
|
|
|
- this->__construct_from(_VSTD::move(__v));
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- optional& operator=(nullopt_t) noexcept
|
|
|
|
- {
|
|
|
|
- reset();
|
|
|
|
- return *this;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY optional& operator=(const optional&) = default;
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY optional& operator=(optional&&) = default;
|
|
|
|
-
|
|
|
|
- // LWG2756
|
|
|
|
- template <class _Up = value_type,
|
|
|
|
- class = enable_if_t
|
|
|
|
- <
|
|
|
|
- !is_same_v<_Up, optional> &&
|
|
|
|
- !(is_same_v<_Up, value_type> && is_scalar_v<value_type>) &&
|
|
|
|
- is_constructible_v<value_type, _Up> &&
|
|
|
|
- is_assignable_v<value_type&, _Up>
|
|
|
|
- >
|
|
|
|
- >
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- optional&
|
|
|
|
- operator=(_Up&& __v)
|
|
|
|
- {
|
|
|
|
- if (this->has_value())
|
|
|
|
- this->__get() = _VSTD::forward<_Up>(__v);
|
|
|
|
- else
|
|
|
|
- this->__construct(_VSTD::forward<_Up>(__v));
|
|
|
|
- return *this;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- // LWG2756
|
|
|
|
- template <class _Up, enable_if_t<
|
|
|
|
- _CheckOptionalLikeAssign<_Up, _Up const&>::template __enable_assign<_Up>()
|
|
|
|
- , int> = 0>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- optional&
|
|
|
|
- operator=(const optional<_Up>& __v)
|
|
|
|
- {
|
|
|
|
- this->__assign_from(__v);
|
|
|
|
- return *this;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- // LWG2756
|
|
|
|
- template <class _Up, enable_if_t<
|
|
|
|
- _CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_assign<_Up>()
|
|
|
|
- , int> = 0>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- optional&
|
|
|
|
- operator=(optional<_Up>&& __v)
|
|
|
|
- {
|
|
|
|
- this->__assign_from(_VSTD::move(__v));
|
|
|
|
- return *this;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class... _Args,
|
|
|
|
- class = enable_if_t
|
|
|
|
- <
|
|
|
|
- is_constructible_v<value_type, _Args...>
|
|
|
|
- >
|
|
|
|
- >
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void
|
|
|
|
- emplace(_Args&&... __args)
|
|
|
|
- {
|
|
|
|
- reset();
|
|
|
|
- this->__construct(_VSTD::forward<_Args>(__args)...);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class _Up, class... _Args,
|
|
|
|
- class = enable_if_t
|
|
|
|
- <
|
|
|
|
- is_constructible_v<value_type, initializer_list<_Up>&, _Args...>
|
|
|
|
- >
|
|
|
|
- >
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void
|
|
|
|
- emplace(initializer_list<_Up> __il, _Args&&... __args)
|
|
|
|
- {
|
|
|
|
- reset();
|
|
|
|
- this->__construct(__il, _VSTD::forward<_Args>(__args)...);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <bool _Dummy = false, class = enable_if_t<
|
|
|
|
- __dependent_type<is_move_constructible<_Tp>, _Dummy>::value &&
|
|
|
|
- __dependent_type<is_swappable<_Tp>, _Dummy>::value
|
|
|
|
- >>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- void swap(optional& __opt)
|
|
|
|
- noexcept(is_nothrow_move_constructible_v<value_type> &&
|
|
|
|
- is_nothrow_swappable_v<value_type>)
|
|
|
|
- {
|
|
|
|
- if (this->has_value() == __opt.has_value())
|
|
|
|
- {
|
|
|
|
- using _VSTD::swap;
|
|
|
|
- if (this->has_value())
|
|
|
|
- swap(this->__get(), __opt.__get());
|
|
|
|
- }
|
|
|
|
- else
|
|
|
|
- {
|
|
|
|
- if (this->has_value())
|
|
|
|
- {
|
|
|
|
- __opt.__construct(_VSTD::move(this->__get()));
|
|
|
|
- reset();
|
|
|
|
- }
|
|
|
|
- else
|
|
|
|
- {
|
|
|
|
- this->__construct(_VSTD::move(__opt.__get()));
|
|
|
|
- __opt.reset();
|
|
|
|
- }
|
|
|
|
- }
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr
|
|
|
|
- add_pointer_t<value_type const>
|
|
|
|
- operator->() const
|
|
|
|
- {
|
|
|
|
- _LIBCPP_ASSERT(this->has_value(), "optional operator-> called for disengaged value");
|
|
|
|
-#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
|
|
|
|
- return _VSTD::addressof(this->__get());
|
|
|
|
-#else
|
|
|
|
- return __operator_arrow(__has_operator_addressof<value_type>{}, this->__get());
|
|
|
|
-#endif
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr
|
|
|
|
- add_pointer_t<value_type>
|
|
|
|
- operator->()
|
|
|
|
- {
|
|
|
|
- _LIBCPP_ASSERT(this->has_value(), "optional operator-> called for disengaged value");
|
|
|
|
-#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
|
|
|
|
- return _VSTD::addressof(this->__get());
|
|
|
|
-#else
|
|
|
|
- return __operator_arrow(__has_operator_addressof<value_type>{}, this->__get());
|
|
|
|
-#endif
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr
|
|
|
|
- const value_type&
|
|
|
|
- operator*() const&
|
|
|
|
- {
|
|
|
|
- _LIBCPP_ASSERT(this->has_value(), "optional operator* called for disengaged value");
|
|
|
|
- return this->__get();
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr
|
|
|
|
- value_type&
|
|
|
|
- operator*() &
|
|
|
|
- {
|
|
|
|
- _LIBCPP_ASSERT(this->has_value(), "optional operator* called for disengaged value");
|
|
|
|
- return this->__get();
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr
|
|
|
|
- value_type&&
|
|
|
|
- operator*() &&
|
|
|
|
- {
|
|
|
|
- _LIBCPP_ASSERT(this->has_value(), "optional operator* called for disengaged value");
|
|
|
|
- return _VSTD::move(this->__get());
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr
|
|
|
|
- const value_type&&
|
|
|
|
- operator*() const&&
|
|
|
|
- {
|
|
|
|
- _LIBCPP_ASSERT(this->has_value(), "optional operator* called for disengaged value");
|
|
|
|
- return _VSTD::move(this->__get());
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr explicit operator bool() const noexcept { return has_value(); }
|
|
|
|
-
|
|
|
|
- using __base::has_value;
|
|
|
|
- using __base::__get;
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type const& value() const&
|
|
|
|
- {
|
|
|
|
- if (!this->has_value())
|
|
|
|
- __throw_bad_optional_access();
|
|
|
|
- return this->__get();
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type& value() &
|
|
|
|
- {
|
|
|
|
- if (!this->has_value())
|
|
|
|
- __throw_bad_optional_access();
|
|
|
|
- return this->__get();
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type&& value() &&
|
|
|
|
- {
|
|
|
|
- if (!this->has_value())
|
|
|
|
- __throw_bad_optional_access();
|
|
|
|
- return _VSTD::move(this->__get());
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type const&& value() const&&
|
|
|
|
- {
|
|
|
|
- if (!this->has_value())
|
|
|
|
- __throw_bad_optional_access();
|
|
|
|
- return _VSTD::move(this->__get());
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class _Up>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- constexpr value_type value_or(_Up&& __v) const&
|
|
|
|
- {
|
|
|
|
- static_assert(is_copy_constructible_v<value_type>,
|
|
|
|
- "optional<T>::value_or: T must be copy constructible");
|
|
|
|
- static_assert(is_convertible_v<_Up, value_type>,
|
|
|
|
- "optional<T>::value_or: U must be convertible to T");
|
|
|
|
- return this->has_value() ? this->__get() :
|
|
|
|
- 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_v<value_type>,
|
|
|
|
- "optional<T>::value_or: T must be move constructible");
|
|
|
|
- static_assert(is_convertible_v<_Up, value_type>,
|
|
|
|
- "optional<T>::value_or: U must be convertible to T");
|
|
|
|
- return this->has_value() ? _VSTD::move(this->__get()) :
|
|
|
|
- static_cast<value_type>(_VSTD::forward<_Up>(__v));
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- using __base::reset;
|
|
|
|
-
|
|
|
|
-private:
|
|
|
|
- template <class _Up>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- static _Up*
|
|
|
|
- __operator_arrow(true_type, _Up& __x)
|
|
|
|
- {
|
|
|
|
- return _VSTD::addressof(__x);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- template <class _Up>
|
|
|
|
- _LIBCPP_INLINE_VISIBILITY
|
|
|
|
- static constexpr _Up*
|
|
|
|
- __operator_arrow(false_type, _Up& __x)
|
|
|
|
- {
|
|
|
|
- return &__x;
|
|
|
|
- }
|
|
|
|
-};
|
|
|
|
-
|
|
|
|
-// Comparisons between optionals
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() ==
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- 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>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() !=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator!=(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
|
-{
|
|
|
|
- if (static_cast<bool>(__x) != static_cast<bool>(__y))
|
|
|
|
- return true;
|
|
|
|
- if (!static_cast<bool>(__x))
|
|
|
|
- return false;
|
|
|
|
- return *__x != *__y;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- 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>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator>(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
|
-{
|
|
|
|
- if (!static_cast<bool>(__x))
|
|
|
|
- return false;
|
|
|
|
- if (!static_cast<bool>(__y))
|
|
|
|
- return true;
|
|
|
|
- return *__x > *__y;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator<=(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
|
-{
|
|
|
|
- if (!static_cast<bool>(__x))
|
|
|
|
- return true;
|
|
|
|
- if (!static_cast<bool>(__y))
|
|
|
|
- return false;
|
|
|
|
- return *__x <= *__y;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator>=(const optional<_Tp>& __x, const optional<_Tp>& __y)
|
|
|
|
-{
|
|
|
|
- if (!static_cast<bool>(__y))
|
|
|
|
- return true;
|
|
|
|
- if (!static_cast<bool>(__x))
|
|
|
|
- return false;
|
|
|
|
- return *__x >= *__y;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-// Comparisons with nullopt
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator==(const optional<_Tp>& __x, nullopt_t) noexcept
|
|
|
|
-{
|
|
|
|
- return !static_cast<bool>(__x);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator==(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
|
-{
|
|
|
|
- return !static_cast<bool>(__x);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator!=(const optional<_Tp>& __x, nullopt_t) noexcept
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator!=(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator<(const optional<_Tp>&, nullopt_t) noexcept
|
|
|
|
-{
|
|
|
|
- return false;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator<(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator<=(const optional<_Tp>& __x, nullopt_t) noexcept
|
|
|
|
-{
|
|
|
|
- return !static_cast<bool>(__x);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator<=(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
|
-{
|
|
|
|
- return true;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator>(const optional<_Tp>& __x, nullopt_t) noexcept
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator>(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
|
-{
|
|
|
|
- return false;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator>=(const optional<_Tp>&, nullopt_t) noexcept
|
|
|
|
-{
|
|
|
|
- return true;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-bool
|
|
|
|
-operator>=(nullopt_t, const optional<_Tp>& __x) noexcept
|
|
|
|
-{
|
|
|
|
- return !static_cast<bool>(__x);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-// Comparisons with T
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() ==
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator==(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? *__x == __v : false;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() ==
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator==(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? __v == *__x : false;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() !=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator!=(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? *__x != __v : true;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() !=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator!=(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? __v != *__x : true;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator<(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? *__x < __v : true;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator<(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? __v < *__x : false;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator<=(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? *__x <= __v : true;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator<=(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? __v <= *__x : false;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator>(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? *__x > __v : false;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator>(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? __v > *__x : true;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator>=(const optional<_Tp>& __x, const _Tp& __v)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? *__x >= __v : false;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-enable_if_t<
|
|
|
|
- is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >=
|
|
|
|
- _VSTD::declval<const _Tp&>()), bool>,
|
|
|
|
- bool
|
|
|
|
->
|
|
|
|
-operator>=(const _Tp& __v, const optional<_Tp>& __x)
|
|
|
|
-{
|
|
|
|
- return static_cast<bool>(__x) ? __v >= *__x : true;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-inline _LIBCPP_INLINE_VISIBILITY
|
|
|
|
-enable_if_t<
|
|
|
|
- is_move_constructible_v<_Tp> && is_swappable_v<_Tp>,
|
|
|
|
- void
|
|
|
|
->
|
|
|
|
-swap(optional<_Tp>& __x, optional<_Tp>& __y) noexcept(noexcept(__x.swap(__y)))
|
|
|
|
-{
|
|
|
|
- __x.swap(__y);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-optional<decay_t<_Tp>> make_optional(_Tp&& __v)
|
|
|
|
-{
|
|
|
|
- return optional<decay_t<_Tp>>(_VSTD::forward<_Tp>(__v));
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp, class... _Args>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-optional<_Tp> make_optional(_Args&&... __args)
|
|
|
|
-{
|
|
|
|
- return optional<_Tp>(in_place, _VSTD::forward<_Args>(__args)...);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp, class _Up, class... _Args>
|
|
|
|
-_LIBCPP_INLINE_VISIBILITY constexpr
|
|
|
|
-optional<_Tp> make_optional(initializer_list<_Up> __il, _Args&&... __args)
|
|
|
|
-{
|
|
|
|
- return optional<_Tp>(in_place, __il, _VSTD::forward<_Args>(__args)...);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-template <class _Tp>
|
|
|
|
-struct _LIBCPP_TYPE_VIS_ONLY hash<optional<_Tp> >
|
|
|
|
-{
|
|
|
|
- typedef 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 > 14
|
|
|
|
-
|
|
|
|
-#endif // _LIBCPP_OPTIONAL
|
|
|