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-rw-r--r--src/libs/3rdparty/optional/optional.hpp1046
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diff --git a/src/libs/3rdparty/optional/optional.hpp b/src/libs/3rdparty/optional/optional.hpp
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index 607696d8e1..0000000000
--- a/src/libs/3rdparty/optional/optional.hpp
+++ /dev/null
@@ -1,1046 +0,0 @@
-// Copyright (C) 2011 - 2012 Andrzej Krzemienski.
-//
-// Use, modification, and distribution is subject to the Boost Software
-// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)
-//
-// The idea and interface is based on Boost.Optional library
-// authored by Fernando Luis Cacciola Carballal
-
-# ifndef ___OPTIONAL_HPP___
-# define ___OPTIONAL_HPP___
-
-# include <utility>
-# include <type_traits>
-# include <initializer_list>
-# include <cassert>
-# include <functional>
-# include <string>
-# include <stdexcept>
-
-# define TR2_OPTIONAL_REQUIRES(...) typename enable_if<__VA_ARGS__::value, bool>::type = false
-
-# if defined __GNUC__ // NOTE: GNUC is also defined for Clang
-# if (__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)
-# define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___
-# elif (__GNUC__ > 4)
-# define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___
-# endif
-#
-# if (__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)
-# define TR2_OPTIONAL_GCC_4_7_AND_HIGHER___
-# elif (__GNUC__ > 4)
-# define TR2_OPTIONAL_GCC_4_7_AND_HIGHER___
-# endif
-#
-# if (__GNUC__ == 4) && (__GNUC_MINOR__ == 8) && (__GNUC_PATCHLEVEL__ >= 1)
-# define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___
-# elif (__GNUC__ == 4) && (__GNUC_MINOR__ >= 9)
-# define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___
-# elif (__GNUC__ > 4)
-# define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___
-# endif
-# endif
-#
-# if defined __clang_major__
-# if (__clang_major__ == 3 && __clang_minor__ >= 5)
-# define TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_
-# elif (__clang_major__ > 3)
-# define TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_
-# endif
-# if defined TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_
-# define TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_
-# elif (__clang_major__ == 3 && __clang_minor__ == 4 && __clang_patchlevel__ >= 2)
-# define TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_
-# endif
-# endif
-#
-# if defined _MSC_VER
-# if (_MSC_VER >= 1900)
-# define TR2_OPTIONAL_MSVC_2015_AND_HIGHER___
-# endif
-# endif
-
-# if defined __clang__
-# if (__clang_major__ > 2) || (__clang_major__ == 2) && (__clang_minor__ >= 9)
-# define OPTIONAL_HAS_THIS_RVALUE_REFS 1
-# else
-# define OPTIONAL_HAS_THIS_RVALUE_REFS 0
-# endif
-# elif defined TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___
-# define OPTIONAL_HAS_THIS_RVALUE_REFS 1
-# elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___
-# define OPTIONAL_HAS_THIS_RVALUE_REFS 1
-# else
-# define OPTIONAL_HAS_THIS_RVALUE_REFS 0
-# endif
-
-
-# if defined TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___
-# define OPTIONAL_HAS_CONSTEXPR_INIT_LIST 1
-# define OPTIONAL_CONSTEXPR_INIT_LIST constexpr
-# else
-# define OPTIONAL_HAS_CONSTEXPR_INIT_LIST 0
-# define OPTIONAL_CONSTEXPR_INIT_LIST
-# endif
-
-# if defined TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ && (defined __cplusplus) && (__cplusplus != 201103L)
-# define OPTIONAL_HAS_MOVE_ACCESSORS 1
-# else
-# define OPTIONAL_HAS_MOVE_ACCESSORS 0
-# endif
-
-# // In C++11 constexpr implies const, so we need to make non-const members also non-constexpr
-# if (defined __cplusplus) && (__cplusplus == 201103L)
-# define OPTIONAL_MUTABLE_CONSTEXPR
-# else
-# define OPTIONAL_MUTABLE_CONSTEXPR constexpr
-# endif
-
-namespace std{
-
-namespace experimental{
-
-// BEGIN workaround for missing is_trivially_destructible
-# if defined TR2_OPTIONAL_GCC_4_8_AND_HIGHER___
- // leave it: it is already there
-# elif defined TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_
- // leave it: it is already there
-# elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___
- // leave it: it is already there
-# elif defined TR2_OPTIONAL_DISABLE_EMULATION_OF_TYPE_TRAITS
- // leave it: the user doesn't want it
-# else
- template <typename T>
- using is_trivially_destructible = std::has_trivial_destructor<T>;
-# endif
-// END workaround for missing is_trivially_destructible
-
-# if (defined TR2_OPTIONAL_GCC_4_7_AND_HIGHER___)
- // leave it; our metafunctions are already defined.
-# elif defined TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_
- // leave it; our metafunctions are already defined.
-# elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___
- // leave it: it is already there
-# elif defined TR2_OPTIONAL_DISABLE_EMULATION_OF_TYPE_TRAITS
- // leave it: the user doesn't want it
-# else
-
-
-// workaround for missing traits in GCC and CLANG
-template <class T>
-struct is_nothrow_move_constructible
-{
- constexpr static bool value = std::is_nothrow_constructible<T, T&&>::value;
-};
-
-
-template <class T, class U>
-struct is_assignable
-{
- template <class X, class Y>
- constexpr static bool has_assign(...) { return false; }
-
- template <class X, class Y, size_t S = sizeof((std::declval<X>() = std::declval<Y>(), true)) >
- // the comma operator is necessary for the cases where operator= returns void
- constexpr static bool has_assign(bool) { return true; }
-
- constexpr static bool value = has_assign<T, U>(true);
-};
-
-
-template <class T>
-struct is_nothrow_move_assignable
-{
- template <class X, bool has_any_move_assign>
- struct has_nothrow_move_assign {
- constexpr static bool value = false;
- };
-
- template <class X>
- struct has_nothrow_move_assign<X, true> {
- constexpr static bool value = noexcept( std::declval<X&>() = std::declval<X&&>() );
- };
-
- constexpr static bool value = has_nothrow_move_assign<T, is_assignable<T&, T&&>::value>::value;
-};
-// end workaround
-
-
-# endif
-
-
-
-// 20.5.4, optional for object types
-template <class T> class optional;
-
-// 20.5.5, optional for lvalue reference types
-template <class T> class optional<T&>;
-
-
-// workaround: std utility functions aren't constexpr yet
-template <class T> inline constexpr T&& constexpr_forward(typename std::remove_reference<T>::type& t) noexcept
-{
- return static_cast<T&&>(t);
-}
-
-template <class T> inline constexpr T&& constexpr_forward(typename std::remove_reference<T>::type&& t) noexcept
-{
- static_assert(!std::is_lvalue_reference<T>::value, "!!");
- return static_cast<T&&>(t);
-}
-
-template <class T> inline constexpr typename std::remove_reference<T>::type&& constexpr_move(T&& t) noexcept
-{
- return static_cast<typename std::remove_reference<T>::type&&>(t);
-}
-
-
-#if defined NDEBUG
-# define TR2_OPTIONAL_ASSERTED_EXPRESSION(CHECK, EXPR) (EXPR)
-#else
-# define TR2_OPTIONAL_ASSERTED_EXPRESSION(CHECK, EXPR) ((CHECK) ? (EXPR) : ([]{assert(!#CHECK);}(), (EXPR)))
-#endif
-
-
-namespace detail_
-{
-
-// static_addressof: a constexpr version of addressof
-template <typename T>
-struct has_overloaded_addressof
-{
- template <class X>
- constexpr static bool has_overload(...) { return false; }
-
- template <class X, size_t S = sizeof(std::declval<X&>().operator&()) >
- constexpr static bool has_overload(bool) { return true; }
-
- constexpr static bool value = has_overload<T>(true);
-};
-
-template <typename T, TR2_OPTIONAL_REQUIRES(!has_overloaded_addressof<T>)>
-constexpr T* static_addressof(T& ref)
-{
- return &ref;
-}
-
-template <typename T, TR2_OPTIONAL_REQUIRES(has_overloaded_addressof<T>)>
-T* static_addressof(T& ref)
-{
- return std::addressof(ref);
-}
-
-
-// the call to convert<A>(b) has return type A and converts b to type A iff b decltype(b) is implicitly convertible to A
-template <class U>
-constexpr U convert(U v) { return v; }
-
-} // namespace detail
-
-
-constexpr struct trivial_init_t{} trivial_init{};
-
-
-// 20.5.6, In-place construction
-constexpr struct in_place_t{} in_place{};
-
-
-// 20.5.7, Disengaged state indicator
-struct nullopt_t
-{
- struct init{};
- constexpr explicit nullopt_t(init){}
-};
-constexpr nullopt_t nullopt{nullopt_t::init()};
-
-
-// 20.5.8, class bad_optional_access
-class bad_optional_access : public logic_error {
-public:
- explicit bad_optional_access(const string& what_arg) : logic_error{what_arg} {}
- explicit bad_optional_access(const char* what_arg) : logic_error{what_arg} {}
-};
-
-
-template <class T>
-union storage_t
-{
- unsigned char dummy_;
- T value_;
-
- constexpr storage_t( trivial_init_t ) noexcept : dummy_() {};
-
- template <class... Args>
- constexpr storage_t( Args&&... args ) : value_(constexpr_forward<Args>(args)...) {}
-
- ~storage_t(){}
-};
-
-
-template <class T>
-union constexpr_storage_t
-{
- unsigned char dummy_;
- T value_;
-
- constexpr constexpr_storage_t( trivial_init_t ) noexcept : dummy_() {};
-
- template <class... Args>
- constexpr constexpr_storage_t( Args&&... args ) : value_(constexpr_forward<Args>(args)...) {}
-
- ~constexpr_storage_t() = default;
-};
-
-
-template <class T>
-struct optional_base
-{
- bool init_;
- storage_t<T> storage_;
-
- constexpr optional_base() noexcept : init_(false), storage_(trivial_init) {};
-
- explicit constexpr optional_base(const T& v) : init_(true), storage_(v) {}
-
- explicit constexpr optional_base(T&& v) : init_(true), storage_(constexpr_move(v)) {}
-
- template <class... Args> explicit optional_base(in_place_t, Args&&... args)
- : init_(true), storage_(constexpr_forward<Args>(args)...) {}
-
- template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)>
- explicit optional_base(in_place_t, std::initializer_list<U> il, Args&&... args)
- : init_(true), storage_(il, std::forward<Args>(args)...) {}
-
- ~optional_base() { if (init_) storage_.value_.T::~T(); }
-};
-
-
-template <class T>
-struct constexpr_optional_base
-{
- bool init_;
- constexpr_storage_t<T> storage_;
-
- constexpr constexpr_optional_base() noexcept : init_(false), storage_(trivial_init) {};
-
- explicit constexpr constexpr_optional_base(const T& v) : init_(true), storage_(v) {}
-
- explicit constexpr constexpr_optional_base(T&& v) : init_(true), storage_(constexpr_move(v)) {}
-
- template <class... Args> explicit constexpr constexpr_optional_base(in_place_t, Args&&... args)
- : init_(true), storage_(constexpr_forward<Args>(args)...) {}
-
- template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)>
- OPTIONAL_CONSTEXPR_INIT_LIST explicit constexpr_optional_base(in_place_t, std::initializer_list<U> il, Args&&... args)
- : init_(true), storage_(il, std::forward<Args>(args)...) {}
-
- ~constexpr_optional_base() = default;
-};
-
-template <class T>
-using OptionalBase = typename std::conditional<
- is_trivially_destructible<T>::value,
- constexpr_optional_base<typename std::remove_const<T>::type>,
- optional_base<typename std::remove_const<T>::type>
->::type;
-
-
-
-template <class T>
-class optional : private OptionalBase<T>
-{
- static_assert( !std::is_same<typename std::decay<T>::type, nullopt_t>::value, "bad T" );
- static_assert( !std::is_same<typename std::decay<T>::type, in_place_t>::value, "bad T" );
-
-
- constexpr bool initialized() const noexcept { return OptionalBase<T>::init_; }
- typename std::remove_const<T>::type* dataptr() { return std::addressof(OptionalBase<T>::storage_.value_); }
- constexpr const T* dataptr() const { return detail_::static_addressof(OptionalBase<T>::storage_.value_); }
-
-# if OPTIONAL_HAS_THIS_RVALUE_REFS == 1
- constexpr const T& contained_val() const& { return OptionalBase<T>::storage_.value_; }
-# if OPTIONAL_HAS_MOVE_ACCESSORS == 1
- OPTIONAL_MUTABLE_CONSTEXPR T&& contained_val() && { return std::move(OptionalBase<T>::storage_.value_); }
- OPTIONAL_MUTABLE_CONSTEXPR T& contained_val() & { return OptionalBase<T>::storage_.value_; }
-# else
- T& contained_val() & { return OptionalBase<T>::storage_.value_; }
- T&& contained_val() && { return std::move(OptionalBase<T>::storage_.value_); }
-# endif
-# else
- constexpr const T& contained_val() const { return OptionalBase<T>::storage_.value_; }
- T& contained_val() { return OptionalBase<T>::storage_.value_; }
-# endif
-
- void clear() noexcept {
- if (initialized()) dataptr()->T::~T();
- OptionalBase<T>::init_ = false;
- }
-
- template <class... Args>
- void initialize(Args&&... args) noexcept(noexcept(T(std::forward<Args>(args)...)))
- {
- assert(!OptionalBase<T>::init_);
- ::new (static_cast<void*>(dataptr())) T(std::forward<Args>(args)...);
- OptionalBase<T>::init_ = true;
- }
-
- template <class U, class... Args>
- void initialize(std::initializer_list<U> il, Args&&... args) noexcept(noexcept(T(il, std::forward<Args>(args)...)))
- {
- assert(!OptionalBase<T>::init_);
- ::new (static_cast<void*>(dataptr())) T(il, std::forward<Args>(args)...);
- OptionalBase<T>::init_ = true;
- }
-
-public:
- typedef T value_type;
-
- // 20.5.5.1, constructors
- constexpr optional() noexcept : OptionalBase<T>() {};
- constexpr optional(nullopt_t) noexcept : OptionalBase<T>() {};
-
- optional(const optional& rhs)
- : OptionalBase<T>()
- {
- if (rhs.initialized()) {
- ::new (static_cast<void*>(dataptr())) T(*rhs);
- OptionalBase<T>::init_ = true;
- }
- }
-
- optional(optional&& rhs) noexcept(is_nothrow_move_constructible<T>::value)
- : OptionalBase<T>()
- {
- if (rhs.initialized()) {
- ::new (static_cast<void*>(dataptr())) T(std::move(*rhs));
- OptionalBase<T>::init_ = true;
- }
- }
-
- constexpr optional(const T& v) : OptionalBase<T>(v) {}
-
- constexpr optional(T&& v) : OptionalBase<T>(constexpr_move(v)) {}
-
- template <class... Args>
- explicit constexpr optional(in_place_t, Args&&... args)
- : OptionalBase<T>(in_place_t{}, constexpr_forward<Args>(args)...) {}
-
- template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)>
- OPTIONAL_CONSTEXPR_INIT_LIST explicit optional(in_place_t, std::initializer_list<U> il, Args&&... args)
- : OptionalBase<T>(in_place_t{}, il, constexpr_forward<Args>(args)...) {}
-
- // 20.5.4.2, Destructor
- ~optional() = default;
-
- void reset() noexcept { clear(); }
-
- // 20.5.4.3, assignment
- optional& operator=(nullopt_t) noexcept
- {
- clear();
- return *this;
- }
-
- optional& operator=(const optional& rhs)
- {
- if (initialized() == true && rhs.initialized() == false) clear();
- else if (initialized() == false && rhs.initialized() == true) initialize(*rhs);
- else if (initialized() == true && rhs.initialized() == true) contained_val() = *rhs;
- return *this;
- }
-
- optional& operator=(optional&& rhs)
- noexcept(is_nothrow_move_assignable<T>::value && is_nothrow_move_constructible<T>::value)
- {
- if (initialized() == true && rhs.initialized() == false) clear();
- else if (initialized() == false && rhs.initialized() == true) initialize(std::move(*rhs));
- else if (initialized() == true && rhs.initialized() == true) contained_val() = std::move(*rhs);
- return *this;
- }
-
- template <class U>
- auto operator=(U&& v)
- -> typename enable_if
- <
- is_same<typename decay<U>::type, T>::value,
- optional&
- >::type
- {
- if (initialized()) { contained_val() = std::forward<U>(v); }
- else { initialize(std::forward<U>(v)); }
- return *this;
- }
-
-
- template <class... Args>
- void emplace(Args&&... args)
- {
- clear();
- initialize(std::forward<Args>(args)...);
- }
-
- template <class U, class... Args>
- void emplace(initializer_list<U> il, Args&&... args)
- {
- clear();
- initialize<U, Args...>(il, std::forward<Args>(args)...);
- }
-
- // 20.5.4.4, Swap
- void swap(optional<T>& rhs) noexcept(is_nothrow_move_constructible<T>::value && noexcept(swap(declval<T&>(), declval<T&>())))
- {
- if (initialized() == true && rhs.initialized() == false) { rhs.initialize(std::move(**this)); clear(); }
- else if (initialized() == false && rhs.initialized() == true) { initialize(std::move(*rhs)); rhs.clear(); }
- else if (initialized() == true && rhs.initialized() == true) { using std::swap; swap(**this, *rhs); }
- }
-
- // 20.5.4.5, Observers
-
- explicit constexpr operator bool() const noexcept { return initialized(); }
- constexpr bool has_value() const noexcept { return initialized(); }
-
- constexpr T const* operator ->() const {
- return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), dataptr());
- }
-
-# if OPTIONAL_HAS_MOVE_ACCESSORS == 1
-
- OPTIONAL_MUTABLE_CONSTEXPR T* operator ->() {
- assert (initialized());
- return dataptr();
- }
-
- constexpr T const& operator *() const& {
- return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), contained_val());
- }
-
- OPTIONAL_MUTABLE_CONSTEXPR T& operator *() & {
- assert (initialized());
- return contained_val();
- }
-
- OPTIONAL_MUTABLE_CONSTEXPR T&& operator *() && {
- assert (initialized());
- return constexpr_move(contained_val());
- }
-
- constexpr T const& value() const& {
- return initialized() ? contained_val() : (throw bad_optional_access("bad optional access"), contained_val());
- }
-
- OPTIONAL_MUTABLE_CONSTEXPR T& value() & {
- return initialized() ? contained_val() : (throw bad_optional_access("bad optional access"), contained_val());
- }
-
- OPTIONAL_MUTABLE_CONSTEXPR T&& value() && {
- if (!initialized()) throw bad_optional_access("bad optional access");
- return std::move(contained_val());
- }
-
-# else
-
- T* operator ->() {
- assert (initialized());
- return dataptr();
- }
-
- constexpr T const& operator *() const {
- return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), contained_val());
- }
-
- T& operator *() {
- assert (initialized());
- return contained_val();
- }
-
- constexpr T const& value() const {
- return initialized() ? contained_val() : (throw bad_optional_access("bad optional access"), contained_val());
- }
-
- T& value() {
- return initialized() ? contained_val() : (throw bad_optional_access("bad optional access"), contained_val());
- }
-
-# endif
-
-# if OPTIONAL_HAS_THIS_RVALUE_REFS == 1
-
- template <class V>
- constexpr T value_or(V&& v) const&
- {
- return *this ? **this : detail_::convert<T>(constexpr_forward<V>(v));
- }
-
-# if OPTIONAL_HAS_MOVE_ACCESSORS == 1
-
- template <class V>
- OPTIONAL_MUTABLE_CONSTEXPR T value_or(V&& v) &&
- {
- return *this ? constexpr_move(const_cast<optional<T>&>(*this).contained_val()) : detail_::convert<T>(constexpr_forward<V>(v));
- }
-
-# else
-
- template <class V>
- T value_or(V&& v) &&
- {
- return *this ? constexpr_move(const_cast<optional<T>&>(*this).contained_val()) : detail_::convert<T>(constexpr_forward<V>(v));
- }
-
-# endif
-
-# else
-
- template <class V>
- constexpr T value_or(V&& v) const
- {
- return *this ? **this : detail_::convert<T>(constexpr_forward<V>(v));
- }
-
-# endif
-
-};
-
-
-template <class T>
-class optional<T&>
-{
- static_assert( !std::is_same<T, nullopt_t>::value, "bad T" );
- static_assert( !std::is_same<T, in_place_t>::value, "bad T" );
- T* ref;
-
-public:
-
- // 20.5.5.1, construction/destruction
- constexpr optional() noexcept : ref(nullptr) {}
-
- constexpr optional(nullopt_t) noexcept : ref(nullptr) {}
-
- constexpr optional(T& v) noexcept : ref(detail_::static_addressof(v)) {}
-
- optional(T&&) = delete;
-
- constexpr optional(const optional& rhs) noexcept : ref(rhs.ref) {}
-
- explicit constexpr optional(in_place_t, T& v) noexcept : ref(detail_::static_addressof(v)) {}
-
- explicit optional(in_place_t, T&&) = delete;
-
- ~optional() = default;
-
- // 20.5.5.2, mutation
- optional& operator=(nullopt_t) noexcept {
- ref = nullptr;
- return *this;
- }
-
- // optional& operator=(const optional& rhs) noexcept {
- // ref = rhs.ref;
- // return *this;
- // }
-
- // optional& operator=(optional&& rhs) noexcept {
- // ref = rhs.ref;
- // return *this;
- // }
-
- template <typename U>
- auto operator=(U&& rhs) noexcept
- -> typename enable_if
- <
- is_same<typename decay<U>::type, optional<T&>>::value,
- optional&
- >::type
- {
- ref = rhs.ref;
- return *this;
- }
-
- template <typename U>
- auto operator=(U&& rhs) noexcept
- -> typename enable_if
- <
- !is_same<typename decay<U>::type, optional<T&>>::value,
- optional&
- >::type
- = delete;
-
- void emplace(T& v) noexcept {
- ref = detail_::static_addressof(v);
- }
-
- void emplace(T&&) = delete;
-
-
- void swap(optional<T&>& rhs) noexcept
- {
- std::swap(ref, rhs.ref);
- }
-
- // 20.5.5.3, observers
- constexpr T* operator->() const {
- return TR2_OPTIONAL_ASSERTED_EXPRESSION(ref, ref);
- }
-
- constexpr T& operator*() const {
- return TR2_OPTIONAL_ASSERTED_EXPRESSION(ref, *ref);
- }
-
- constexpr T& value() const {
- return ref ? *ref : (throw bad_optional_access("bad optional access"), *ref);
- }
-
- explicit constexpr operator bool() const noexcept {
- return ref != nullptr;
- }
- constexpr bool has_value() const noexcept { return ref != nullptr; }
-
- template <class V>
- constexpr typename decay<T>::type value_or(V&& v) const
- {
- return *this ? **this : detail_::convert<typename decay<T>::type>(constexpr_forward<V>(v));
- }
-};
-
-
-template <class T>
-class optional<T&&>
-{
- static_assert( sizeof(T) == 0, "optional rvalue references disallowed" );
-};
-
-
-// 20.5.8, Relational operators
-template <class T> constexpr bool operator==(const optional<T>& x, const optional<T>& y)
-{
- return bool(x) != bool(y) ? false : bool(x) == false ? true : *x == *y;
-}
-
-template <class T> constexpr bool operator!=(const optional<T>& x, const optional<T>& y)
-{
- return !(x == y);
-}
-
-template <class T> constexpr bool operator<(const optional<T>& x, const optional<T>& y)
-{
- return (!y) ? false : (!x) ? true : *x < *y;
-}
-
-template <class T> constexpr bool operator>(const optional<T>& x, const optional<T>& y)
-{
- return (y < x);
-}
-
-template <class T> constexpr bool operator<=(const optional<T>& x, const optional<T>& y)
-{
- return !(y < x);
-}
-
-template <class T> constexpr bool operator>=(const optional<T>& x, const optional<T>& y)
-{
- return !(x < y);
-}
-
-
-// 20.5.9, Comparison with nullopt
-template <class T> constexpr bool operator==(const optional<T>& x, nullopt_t) noexcept
-{
- return (!x);
-}
-
-template <class T> constexpr bool operator==(nullopt_t, const optional<T>& x) noexcept
-{
- return (!x);
-}
-
-template <class T> constexpr bool operator!=(const optional<T>& x, nullopt_t) noexcept
-{
- return bool(x);
-}
-
-template <class T> constexpr bool operator!=(nullopt_t, const optional<T>& x) noexcept
-{
- return bool(x);
-}
-
-template <class T> constexpr bool operator<(const optional<T>&, nullopt_t) noexcept
-{
- return false;
-}
-
-template <class T> constexpr bool operator<(nullopt_t, const optional<T>& x) noexcept
-{
- return bool(x);
-}
-
-template <class T> constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept
-{
- return (!x);
-}
-
-template <class T> constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept
-{
- return true;
-}
-
-template <class T> constexpr bool operator>(const optional<T>& x, nullopt_t) noexcept
-{
- return bool(x);
-}
-
-template <class T> constexpr bool operator>(nullopt_t, const optional<T>&) noexcept
-{
- return false;
-}
-
-template <class T> constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept
-{
- return true;
-}
-
-template <class T> constexpr bool operator>=(nullopt_t, const optional<T>& x) noexcept
-{
- return (!x);
-}
-
-
-
-// 20.5.10, Comparison with T
-template <class T> constexpr bool operator==(const optional<T>& x, const T& v)
-{
- return bool(x) ? *x == v : false;
-}
-
-template <class T> constexpr bool operator==(const T& v, const optional<T>& x)
-{
- return bool(x) ? v == *x : false;
-}
-
-template <class T> constexpr bool operator!=(const optional<T>& x, const T& v)
-{
- return bool(x) ? *x != v : true;
-}
-
-template <class T> constexpr bool operator!=(const T& v, const optional<T>& x)
-{
- return bool(x) ? v != *x : true;
-}
-
-template <class T> constexpr bool operator<(const optional<T>& x, const T& v)
-{
- return bool(x) ? *x < v : true;
-}
-
-template <class T> constexpr bool operator>(const T& v, const optional<T>& x)
-{
- return bool(x) ? v > *x : true;
-}
-
-template <class T> constexpr bool operator>(const optional<T>& x, const T& v)
-{
- return bool(x) ? *x > v : false;
-}
-
-template <class T> constexpr bool operator<(const T& v, const optional<T>& x)
-{
- return bool(x) ? v < *x : false;
-}
-
-template <class T> constexpr bool operator>=(const optional<T>& x, const T& v)
-{
- return bool(x) ? *x >= v : false;
-}
-
-template <class T> constexpr bool operator<=(const T& v, const optional<T>& x)
-{
- return bool(x) ? v <= *x : false;
-}
-
-template <class T> constexpr bool operator<=(const optional<T>& x, const T& v)
-{
- return bool(x) ? *x <= v : true;
-}
-
-template <class T> constexpr bool operator>=(const T& v, const optional<T>& x)
-{
- return bool(x) ? v >= *x : true;
-}
-
-
-// Comparison of optional<T&> with T
-template <class T> constexpr bool operator==(const optional<T&>& x, const T& v)
-{
- return bool(x) ? *x == v : false;
-}
-
-template <class T> constexpr bool operator==(const T& v, const optional<T&>& x)
-{
- return bool(x) ? v == *x : false;
-}
-
-template <class T> constexpr bool operator!=(const optional<T&>& x, const T& v)
-{
- return bool(x) ? *x != v : true;
-}
-
-template <class T> constexpr bool operator!=(const T& v, const optional<T&>& x)
-{
- return bool(x) ? v != *x : true;
-}
-
-template <class T> constexpr bool operator<(const optional<T&>& x, const T& v)
-{
- return bool(x) ? *x < v : true;
-}
-
-template <class T> constexpr bool operator>(const T& v, const optional<T&>& x)
-{
- return bool(x) ? v > *x : true;
-}
-
-template <class T> constexpr bool operator>(const optional<T&>& x, const T& v)
-{
- return bool(x) ? *x > v : false;
-}
-
-template <class T> constexpr bool operator<(const T& v, const optional<T&>& x)
-{
- return bool(x) ? v < *x : false;
-}
-
-template <class T> constexpr bool operator>=(const optional<T&>& x, const T& v)
-{
- return bool(x) ? *x >= v : false;
-}
-
-template <class T> constexpr bool operator<=(const T& v, const optional<T&>& x)
-{
- return bool(x) ? v <= *x : false;
-}
-
-template <class T> constexpr bool operator<=(const optional<T&>& x, const T& v)
-{
- return bool(x) ? *x <= v : true;
-}
-
-template <class T> constexpr bool operator>=(const T& v, const optional<T&>& x)
-{
- return bool(x) ? v >= *x : true;
-}
-
-// Comparison of optional<T const&> with T
-template <class T> constexpr bool operator==(const optional<const T&>& x, const T& v)
-{
- return bool(x) ? *x == v : false;
-}
-
-template <class T> constexpr bool operator==(const T& v, const optional<const T&>& x)
-{
- return bool(x) ? v == *x : false;
-}
-
-template <class T> constexpr bool operator!=(const optional<const T&>& x, const T& v)
-{
- return bool(x) ? *x != v : true;
-}
-
-template <class T> constexpr bool operator!=(const T& v, const optional<const T&>& x)
-{
- return bool(x) ? v != *x : true;
-}
-
-template <class T> constexpr bool operator<(const optional<const T&>& x, const T& v)
-{
- return bool(x) ? *x < v : true;
-}
-
-template <class T> constexpr bool operator>(const T& v, const optional<const T&>& x)
-{
- return bool(x) ? v > *x : true;
-}
-
-template <class T> constexpr bool operator>(const optional<const T&>& x, const T& v)
-{
- return bool(x) ? *x > v : false;
-}
-
-template <class T> constexpr bool operator<(const T& v, const optional<const T&>& x)
-{
- return bool(x) ? v < *x : false;
-}
-
-template <class T> constexpr bool operator>=(const optional<const T&>& x, const T& v)
-{
- return bool(x) ? *x >= v : false;
-}
-
-template <class T> constexpr bool operator<=(const T& v, const optional<const T&>& x)
-{
- return bool(x) ? v <= *x : false;
-}
-
-template <class T> constexpr bool operator<=(const optional<const T&>& x, const T& v)
-{
- return bool(x) ? *x <= v : true;
-}
-
-template <class T> constexpr bool operator>=(const T& v, const optional<const T&>& x)
-{
- return bool(x) ? v >= *x : true;
-}
-
-
-// 20.5.12, Specialized algorithms
-template <class T>
-void swap(optional<T>& x, optional<T>& y) noexcept(noexcept(x.swap(y)))
-{
- x.swap(y);
-}
-
-
-template <class T>
-constexpr optional<typename decay<T>::type> make_optional(T&& v)
-{
- return optional<typename decay<T>::type>(constexpr_forward<T>(v));
-}
-
-template <class X>
-constexpr optional<X&> make_optional(reference_wrapper<X> v)
-{
- return optional<X&>(v.get());
-}
-
-
-} // namespace experimental
-} // namespace std
-
-namespace std
-{
- template <typename T>
- struct hash<std::experimental::optional<T>>
- {
- typedef typename hash<T>::result_type result_type;
- typedef std::experimental::optional<T> argument_type;
-
- constexpr result_type operator()(argument_type const& arg) const {
- return arg ? std::hash<T>{}(*arg) : result_type{};
- }
- };
-
- template <typename T>
- struct hash<std::experimental::optional<T&>>
- {
- typedef typename hash<T>::result_type result_type;
- typedef std::experimental::optional<T&> argument_type;
-
- constexpr result_type operator()(argument_type const& arg) const {
- return arg ? std::hash<T>{}(*arg) : result_type{};
- }
- };
-}
-
-# undef TR2_OPTIONAL_REQUIRES
-# undef TR2_OPTIONAL_ASSERTED_EXPRESSION
-
-# endif //___OPTIONAL_HPP___
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-07 15:43:22 +0000