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+// The MIT License (MIT)
+
+// Copyright (c) 2013-2016 Rapptz, ThePhD and contributors
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// 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 SOL_OPTIONAL_IMPLEMENTATION_HPP
+# define SOL_OPTIONAL_IMPLEMENTATION_HPP
+
+# include <utility>
+# include <type_traits>
+# include <initializer_list>
+# include <cassert>
+# include <functional>
+# include <string>
+# include <stdexcept>
+#ifdef SOL_NO_EXCEPTIONS
+#include <cstdlib>
+#endif // Exceptions
+
+# define TR2_OPTIONAL_REQUIRES(...) typename ::std::enable_if<__VA_ARGS__::value, bool>::type = false
+
+# if defined __GNUC__ // NOTE: GNUC is also defined for Clang
+# if (__GNUC__ >= 5)
+# define TR2_OPTIONAL_GCC_5_0_AND_HIGHER___
+# define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___
+# elif (__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 sol {
+
+ // 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{};
+
+ // 20.5.7, 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 ::std::logic_error {
+ public:
+ explicit bad_optional_access(const ::std::string& what_arg) : ::std::logic_error{ what_arg } {}
+ explicit bad_optional_access(const char* what_arg) : ::std::logic_error{ what_arg } {}
+ };
+
+
+ template <class T>
+ struct optional_base
+ {
+ bool init_;
+ char storage_[sizeof(T)];
+
+ constexpr optional_base() noexcept : init_(false), storage_() {};
+
+ explicit optional_base(const T& v) : init_(true), storage_() {
+ new (&storage())T(v);
+ }
+
+ explicit optional_base(T&& v) : init_(true), storage_() {
+ new (&storage())T(constexpr_move(v));
+ }
+
+ template <class... Args> explicit optional_base(in_place_t, Args&&... args)
+ : init_(true), storage_() {
+ new (&storage())T(constexpr_forward<Args>(args)...);
+ }
+
+ template <class U, class... Args, TR2_OPTIONAL_REQUIRES(::std::is_constructible<T, ::std::initializer_list<U>>)>
+ explicit optional_base(in_place_t, ::std::initializer_list<U> il, Args&&... args)
+ : init_(true), storage_() {
+ new (&storage())T(il, constexpr_forward<Args>(args)...);
+ }
+#if defined __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif
+ T& storage() {
+ return *reinterpret_cast<T*>(&storage_[0]);
+ }
+
+ constexpr const T& storage() const {
+ return *reinterpret_cast<T const*>(&storage_[0]);
+ }
+#if defined __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
+ ~optional_base() { if (init_) { storage().T::~T(); } }
+ };
+
+#if defined __GNUC__ && !defined TR2_OPTIONAL_GCC_5_0_AND_HIGHER___
+ // Sorry, GCC 4.x; you're just a piece of shit
+ template <typename T>
+ using constexpr_optional_base = optional_base<T>;
+#else
+ template <class T>
+ struct constexpr_optional_base
+ {
+ bool init_;
+ char storage_[sizeof(T)];
+ constexpr constexpr_optional_base() noexcept : init_(false), storage_() {}
+
+ explicit constexpr constexpr_optional_base(const T& v) : init_(true), storage_() {
+ new (&storage())T(v);
+ }
+
+ explicit constexpr constexpr_optional_base(T&& v) : init_(true), storage_() {
+ new (&storage())T(constexpr_move(v));
+ }
+
+ template <class... Args> explicit constexpr constexpr_optional_base(in_place_t, Args&&... args)
+ : init_(true), storage_() {
+ new (&storage())T(constexpr_forward<Args>(args)...);
+ }
+
+ template <class U, class... Args, TR2_OPTIONAL_REQUIRES(::std::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_() {
+ new (&storage())T(il, constexpr_forward<Args>(args)...);
+ }
+
+#if defined __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif
+ T& storage() {
+ return (*reinterpret_cast<T*>(&storage_[0]));
+ }
+
+ constexpr const T& storage() const {
+ return (*reinterpret_cast<T const*>(&storage_[0]));
+ }
+#if defined __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
+ ~constexpr_optional_base() = default;
+ };
+#endif
+
+ template <class T>
+ using OptionalBase = typename ::std::conditional<
+ ::std::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()); }
+ constexpr const T* dataptr() const { return detail_::static_addressof(OptionalBase<T>::storage()); }
+
+# if OPTIONAL_HAS_THIS_RVALUE_REFS == 1
+ constexpr const T& contained_val() const& { return OptionalBase<T>::storage(); }
+# if OPTIONAL_HAS_MOVE_ACCESSORS == 1
+ OPTIONAL_MUTABLE_CONSTEXPR T&& contained_val() && { return ::std::move(OptionalBase<T>::storage()); }
+ OPTIONAL_MUTABLE_CONSTEXPR T& contained_val() & { return OptionalBase<T>::storage(); }
+# else
+ T& contained_val() & { return OptionalBase<T>::storage(); }
+ T&& contained_val() && { return ::std::move(OptionalBase<T>::storage()); }
+# endif
+# else
+ constexpr const T& contained_val() const { return OptionalBase<T>::storage(); }
+ T& contained_val() { return OptionalBase<T>::storage(); }
+# 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(const optional<T&>& rhs) : optional()
+ {
+ if (rhs) {
+ ::new (static_cast<void*>(dataptr())) T(*rhs);
+ OptionalBase<T>::init_ = true;
+ }
+ }
+
+
+ optional(optional&& rhs) noexcept(::std::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, constexpr_forward<Args>(args)...) {}
+
+ template <class U, class... Args, TR2_OPTIONAL_REQUIRES(::std::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, il, constexpr_forward<Args>(args)...) {}
+
+ // 20.5.4.2, Destructor
+ ~optional() = default;
+
+ // 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(::std::is_nothrow_move_assignable<T>::value && ::std::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 ::std::enable_if
+ <
+ ::std::is_same<typename ::std::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(::std::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(::std::is_nothrow_move_constructible<T>::value && noexcept(swap(::std::declval<T&>(), ::std::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 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()
+#ifdef SOL_NO_EXCEPTIONS
+ // we can't abort here
+ // because there's no constexpr abort
+ : *(T*)nullptr;
+#else
+ : (throw bad_optional_access("bad optional access"), contained_val());
+#endif
+ }
+
+ OPTIONAL_MUTABLE_CONSTEXPR T& value() & {
+ return initialized() ?
+ contained_val()
+#ifdef SOL_NO_EXCEPTIONS
+ : *(T*)nullptr;
+#else
+ : (throw bad_optional_access("bad optional access"), contained_val());
+#endif
+ }
+
+ OPTIONAL_MUTABLE_CONSTEXPR T&& value() && {
+ return initialized() ?
+ contained_val()
+#ifdef SOL_NO_EXCEPTIONS
+ // we can't abort here
+ // because there's no constexpr abort
+ : std::move(*(T*)nullptr);
+#else
+ : (throw bad_optional_access("bad optional access"), contained_val());
+#endif
+ }
+
+# 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()
+#ifdef SOL_NO_EXCEPTIONS
+ // we can't abort here
+ // because there's no constexpr abort
+ : *(T*)nullptr;
+#else
+ : (throw bad_optional_access("bad optional access"), contained_val());
+#endif
+ }
+
+ T& value() {
+ return initialized() ?
+ contained_val()
+#ifdef SOL_NO_EXCEPTIONS
+ // we can abort here
+ // but the others are constexpr, so we can't...
+ : (std::abort(), *(T*)nullptr)
+#else
+ : (throw bad_optional_access("bad optional access"), contained_val());
+#endif
+ }
+
+# 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 ::std::enable_if
+ <
+ ::std::is_same<typename ::std::decay<U>::type, optional<T&>>::value,
+ optional&
+ >::type
+ {
+ ref = rhs.ref;
+ return *this;
+ }
+
+ template <typename U>
+ auto operator=(U&& rhs) noexcept
+ -> typename ::std::enable_if
+ <
+ !::std::is_same<typename ::std::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
+#ifdef SOL_NO_EXCEPTIONS
+ // we can't abort here
+ // because there's no constexpr abort
+ : *(T*)nullptr;
+#else
+ : throw bad_optional_access("bad optional access");
+#endif
+ }
+
+ explicit constexpr operator bool() const noexcept {
+ return ref != nullptr;
+ }
+
+ template <typename V>
+ constexpr T& value_or(V&& v) const
+ {
+ return *this ? **this : detail_::convert<T&>(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 ::std::decay<T>::type> make_optional(T&& v) {
+ return optional<typename ::std::decay<T>::type>(constexpr_forward<T>(v));
+ }
+
+ template <class X>
+ constexpr optional<X&> make_optional(::std::reference_wrapper<X> v) {
+ return optional<X&>(v.get());
+ }
+
+
+} // namespace
+
+namespace std
+{
+ template <typename T>
+ struct hash<sol::optional<T>> {
+ typedef typename hash<T>::result_type result_type;
+ typedef sol::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<sol::optional<T&>> {
+ typedef typename hash<T>::result_type result_type;
+ typedef sol::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 // SOL_OPTIONAL_IMPLEMENTATION_HPP