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sol2/include/sol/optional_implementation.hpp

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// sol3
// The MIT License (MIT)
// Copyright (c) 2013-2018 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 "in_place.hpp"
#include <utility>
#include <type_traits>
#include <initializer_list>
#include <cassert>
#include <functional>
#include <string>
#include <stdexcept>
#if defined(SOL_NO_EXCEPTIONS) && 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_MSVC_2015_AND_HIGHER___) || (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(TR2_OPTIONAL_MSVC_2015_AND_HIGHER___) || ((defined __cplusplus) && (__cplusplus == 201103L))
#define OPTIONAL_MUTABLE_CONSTEXPR
#else
#define OPTIONAL_MUTABLE_CONSTEXPR constexpr
#endif
#if defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___
#pragma warning(push)
#pragma warning(disable : 4814)
#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 {
static constexprbool value = ::std::is_nothrow_constructible<T, T&&>::value;
};
template <class T, class U>
struct is_assignable {
template <class X, class Y>
static constexprbool 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
static constexprbool has_assign(bool) {
return true;
}
static constexprbool 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 {
static constexprbool value = false;
};
template <class X>
struct has_nothrow_move_assign<X, true> {
static constexprbool value = noexcept(::std::declval<X&>() = ::std::declval<X&&>());
};
static constexprbool 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>
static constexpr bool has_overload(...) {
return false;
}
template <class X, size_t S = sizeof(::std::declval<X&>().operator&())>
static constexpr bool has_overload(bool) {
return true;
}
static constexpr 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 alignas(T) optional_base {
char storage_[sizeof(T)];
bool init_;
constexpr optional_base() noexcept
: storage_(), init_(false){};
explicit optional_base(const T& v)
: storage_(), init_(true) {
new (&storage()) T(v);
}
explicit optional_base(T&& v)
: storage_(), init_(true) {
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 alignas(T) constexpr_optional_base {
char storage_[sizeof(T)];
bool init_;
constexpr constexpr_optional_base() noexcept
: storage_(), init_(false) {
}
explicit constexpr constexpr_optional_base(const T& v)
: storage_(), init_(true) {
new (&storage()) T(v);
}
explicit constexpr constexpr_optional_base(T&& v)
: storage_(), init_(true) {
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
: *static_cast<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
: *static_cast<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(*static_cast<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
: *static_cast<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(), *static_cast<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 {
#ifdef SOL_NO_EXCEPTIONS
return *ref;
#else
return ref ? *ref
: (throw bad_optional_access("bad optional access"), *ref);
#endif // Exceptions
}
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 sol
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{};
}
};
} // namespace std
#if defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___
#pragma warning(pop)
#endif
#undef TR2_OPTIONAL_REQUIRES
#undef TR2_OPTIONAL_ASSERTED_EXPRESSION
#endif // SOL_OPTIONAL_IMPLEMENTATION_HPP
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