From fdddefbbbb8f3c0bd223280c74fa7e05bfdc3521 Mon Sep 17 00:00:00 2001 From: Star Rauchenberger Date: Wed, 14 Dec 2022 10:18:29 -0500 Subject: Removed dependency on mpark::variant, as C++17 is readily available now --- vendor/variant.hpp | 2457 ---------------------------------------------------- 1 file changed, 2457 deletions(-) delete mode 100644 vendor/variant.hpp (limited to 'vendor') diff --git a/vendor/variant.hpp b/vendor/variant.hpp deleted file mode 100644 index 42f0184..0000000 --- a/vendor/variant.hpp +++ /dev/null @@ -1,2457 +0,0 @@ -// MPark.Variant -// -// Copyright Michael Park, 2015-2017 -// -// Distributed under the Boost Software License, Version 1.0. -// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) - -#ifndef MPARK_VARIANT_HPP -#define MPARK_VARIANT_HPP - -/* - variant synopsis - -namespace std { - - // 20.7.2, class template variant - template - class variant { - public: - - // 20.7.2.1, constructors - constexpr variant() noexcept(see below); - variant(const variant&); - variant(variant&&) noexcept(see below); - - template constexpr variant(T&&) noexcept(see below); - - template - constexpr explicit variant(in_place_type_t, Args&&...); - - template - constexpr explicit variant( - in_place_type_t, initializer_list, Args&&...); - - template - constexpr explicit variant(in_place_index_t, Args&&...); - - template - constexpr explicit variant( - in_place_index_t, initializer_list, Args&&...); - - // 20.7.2.2, destructor - ~variant(); - - // 20.7.2.3, assignment - variant& operator=(const variant&); - variant& operator=(variant&&) noexcept(see below); - - template variant& operator=(T&&) noexcept(see below); - - // 20.7.2.4, modifiers - template - T& emplace(Args&&...); - - template - T& emplace(initializer_list, Args&&...); - - template - variant_alternative& emplace(Args&&...); - - template - variant_alternative& emplace(initializer_list, Args&&...); - - // 20.7.2.5, value status - constexpr bool valueless_by_exception() const noexcept; - constexpr size_t index() const noexcept; - - // 20.7.2.6, swap - void swap(variant&) noexcept(see below); - }; - - // 20.7.3, variant helper classes - template struct variant_size; // undefined - - template - constexpr size_t variant_size_v = variant_size::value; - - template struct variant_size; - template struct variant_size; - template struct variant_size; - - template - struct variant_size>; - - template struct variant_alternative; // undefined - - template - using variant_alternative_t = typename variant_alternative::type; - - template struct variant_alternative; - template struct variant_alternative; - template struct variant_alternative; - - template - struct variant_alternative>; - - constexpr size_t variant_npos = -1; - - // 20.7.4, value access - template - constexpr bool holds_alternative(const variant&) noexcept; - - template - constexpr variant_alternative_t>& - get(variant&); - - template - constexpr variant_alternative_t>&& - get(variant&&); - - template - constexpr variant_alternative_t> const& - get(const variant&); - - template - constexpr variant_alternative_t> const&& - get(const variant&&); - - template - constexpr T& get(variant&); - - template - constexpr T&& get(variant&&); - - template - constexpr const T& get(const variant&); - - template - constexpr const T&& get(const variant&&); - - template - constexpr add_pointer_t>> - get_if(variant*) noexcept; - - template - constexpr add_pointer_t>> - get_if(const variant*) noexcept; - - template - constexpr add_pointer_t - get_if(variant*) noexcept; - - template - constexpr add_pointer_t - get_if(const variant*) noexcept; - - // 20.7.5, relational operators - template - constexpr bool operator==(const variant&, const variant&); - - template - constexpr bool operator!=(const variant&, const variant&); - - template - constexpr bool operator<(const variant&, const variant&); - - template - constexpr bool operator>(const variant&, const variant&); - - template - constexpr bool operator<=(const variant&, const variant&); - - template - constexpr bool operator>=(const variant&, const variant&); - - // 20.7.6, visitation - template - constexpr see below visit(Visitor&&, Variants&&...); - - // 20.7.7, class monostate - struct monostate; - - // 20.7.8, monostate relational operators - constexpr bool operator<(monostate, monostate) noexcept; - constexpr bool operator>(monostate, monostate) noexcept; - constexpr bool operator<=(monostate, monostate) noexcept; - constexpr bool operator>=(monostate, monostate) noexcept; - constexpr bool operator==(monostate, monostate) noexcept; - constexpr bool operator!=(monostate, monostate) noexcept; - - // 20.7.9, specialized algorithms - template - void swap(variant&, variant&) noexcept(see below); - - // 20.7.10, class bad_variant_access - class bad_variant_access; - - // 20.7.11, hash support - template struct hash; - template struct hash>; - template <> struct hash; - -} // namespace std - -*/ - -#include -#include -#include -#include -#include -#include -#include - -// MPark.Variant -// -// Copyright Michael Park, 2015-2017 -// -// Distributed under the Boost Software License, Version 1.0. -// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) - -#ifndef MPARK_CONFIG_HPP -#define MPARK_CONFIG_HPP - -// MSVC 2015 Update 3. -#if __cplusplus < 201103L && (!defined(_MSC_VER) || _MSC_FULL_VER < 190024210) -#error "MPark.Variant requires C++11 support." -#endif - -#ifndef __has_builtin -#define __has_builtin(x) 0 -#endif - -#ifndef __has_include -#define __has_include(x) 0 -#endif - -#ifndef __has_feature -#define __has_feature(x) 0 -#endif - -#if __has_builtin(__builtin_addressof) || \ - (defined(__GNUC__) && __GNUC__ >= 7) || defined(_MSC_VER) -#define MPARK_BUILTIN_ADDRESSOF -#endif - -#if __has_builtin(__builtin_unreachable) -#define MPARK_BUILTIN_UNREACHABLE -#endif - -#if __has_builtin(__type_pack_element) -#define MPARK_TYPE_PACK_ELEMENT -#endif - -#if defined(__cpp_constexpr) && __cpp_constexpr >= 201304 -#define MPARK_CPP14_CONSTEXPR -#endif - -#if __has_feature(cxx_exceptions) || defined(__cpp_exceptions) || \ - (defined(_MSC_VER) && defined(_CPPUNWIND)) -#define MPARK_EXCEPTIONS -#endif - -#if defined(__cpp_generic_lambdas) || defined(_MSC_VER) -#define MPARK_GENERIC_LAMBDAS -#endif - -#if defined(__cpp_lib_integer_sequence) -#define MPARK_INTEGER_SEQUENCE -#endif - -#if defined(__cpp_return_type_deduction) || defined(_MSC_VER) -#define MPARK_RETURN_TYPE_DEDUCTION -#endif - -#if defined(__cpp_lib_transparent_operators) || defined(_MSC_VER) -#define MPARK_TRANSPARENT_OPERATORS -#endif - -#if defined(__cpp_variable_templates) || defined(_MSC_VER) -#define MPARK_VARIABLE_TEMPLATES -#endif - -#if !defined(__GLIBCXX__) || __has_include() // >= libstdc++-5 -#define MPARK_TRIVIALITY_TYPE_TRAITS -#endif - -#endif // MPARK_CONFIG_HPP - -// MPark.Variant -// -// Copyright Michael Park, 2015-2017 -// -// Distributed under the Boost Software License, Version 1.0. -// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) - -#ifndef MPARK_IN_PLACE_HPP -#define MPARK_IN_PLACE_HPP - -#include - - -namespace mpark { - - struct in_place_t { explicit in_place_t() = default; }; - - template - struct in_place_index_t { explicit in_place_index_t() = default; }; - - template - struct in_place_type_t { explicit in_place_type_t() = default; }; - -#ifdef MPARK_VARIABLE_TEMPLATES - constexpr in_place_t in_place{}; - - template constexpr in_place_index_t in_place_index{}; - - template constexpr in_place_type_t in_place_type{}; -#endif - -} // namespace mpark - -#endif // MPARK_IN_PLACE_HPP - -// MPark.Variant -// -// Copyright Michael Park, 2015-2017 -// -// Distributed under the Boost Software License, Version 1.0. -// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) - -#ifndef MPARK_LIB_HPP -#define MPARK_LIB_HPP - -#include -#include -#include -#include - - -#define RETURN(...) \ - noexcept(noexcept(__VA_ARGS__)) -> decltype(__VA_ARGS__) { \ - return __VA_ARGS__; \ - } - -namespace mpark { - namespace lib { - template - struct identity { using type = T; }; - - inline namespace cpp14 { - template - struct array { - constexpr const T &operator[](std::size_t index) const { - return data[index]; - } - - T data[N == 0 ? 1 : N]; - }; - - template - using add_pointer_t = typename std::add_pointer::type; - - template - using common_type_t = typename std::common_type::type; - - template - using decay_t = typename std::decay::type; - - template - using enable_if_t = typename std::enable_if::type; - - template - using remove_const_t = typename std::remove_const::type; - - template - using remove_reference_t = typename std::remove_reference::type; - - template - inline constexpr T &&forward(remove_reference_t &t) noexcept { - return static_cast(t); - } - - template - inline constexpr T &&forward(remove_reference_t &&t) noexcept { - static_assert(!std::is_lvalue_reference::value, - "can not forward an rvalue as an lvalue"); - return static_cast(t); - } - - template - inline constexpr remove_reference_t &&move(T &&t) noexcept { - return static_cast &&>(t); - } - -#ifdef MPARK_INTEGER_SEQUENCE - using std::integer_sequence; - using std::index_sequence; - using std::make_index_sequence; - using std::index_sequence_for; -#else - template - struct integer_sequence { - using value_type = T; - static constexpr std::size_t size() noexcept { return sizeof...(Is); } - }; - - template - using index_sequence = integer_sequence; - - template - struct make_index_sequence_concat; - - template - struct make_index_sequence_concat, - index_sequence> - : identity> {}; - - template - struct make_index_sequence_impl; - - template - using make_index_sequence = typename make_index_sequence_impl::type; - - template - struct make_index_sequence_impl - : make_index_sequence_concat, - make_index_sequence> {}; - - template <> - struct make_index_sequence_impl<0> : identity> {}; - - template <> - struct make_index_sequence_impl<1> : identity> {}; - - template - using index_sequence_for = make_index_sequence; -#endif - - // -#ifdef MPARK_TRANSPARENT_OPERATORS - using equal_to = std::equal_to<>; -#else - struct equal_to { - template - inline constexpr auto operator()(Lhs &&lhs, Rhs &&rhs) const - RETURN(lib::forward(lhs) == lib::forward(rhs)) - }; -#endif - -#ifdef MPARK_TRANSPARENT_OPERATORS - using not_equal_to = std::not_equal_to<>; -#else - struct not_equal_to { - template - inline constexpr auto operator()(Lhs &&lhs, Rhs &&rhs) const - RETURN(lib::forward(lhs) != lib::forward(rhs)) - }; -#endif - -#ifdef MPARK_TRANSPARENT_OPERATORS - using less = std::less<>; -#else - struct less { - template - inline constexpr auto operator()(Lhs &&lhs, Rhs &&rhs) const - RETURN(lib::forward(lhs) < lib::forward(rhs)) - }; -#endif - -#ifdef MPARK_TRANSPARENT_OPERATORS - using greater = std::greater<>; -#else - struct greater { - template - inline constexpr auto operator()(Lhs &&lhs, Rhs &&rhs) const - RETURN(lib::forward(lhs) > lib::forward(rhs)) - }; -#endif - -#ifdef MPARK_TRANSPARENT_OPERATORS - using less_equal = std::less_equal<>; -#else - struct less_equal { - template - inline constexpr auto operator()(Lhs &&lhs, Rhs &&rhs) const - RETURN(lib::forward(lhs) <= lib::forward(rhs)) - }; -#endif - -#ifdef MPARK_TRANSPARENT_OPERATORS - using greater_equal = std::greater_equal<>; -#else - struct greater_equal { - template - inline constexpr auto operator()(Lhs &&lhs, Rhs &&rhs) const - RETURN(lib::forward(lhs) >= lib::forward(rhs)) - }; -#endif - } // namespace cpp14 - - inline namespace cpp17 { - - // - template - using bool_constant = std::integral_constant; - - template - struct voider : identity {}; - - template - using void_t = typename voider::type; - - namespace detail { - namespace swappable { - - using std::swap; - - template - struct is_swappable { - private: - template (), - std::declval()))> - inline static std::true_type test(int); - - template - inline static std::false_type test(...); - - public: - static constexpr bool value = decltype(test(0))::value; - }; - - template ::value> - struct is_nothrow_swappable { - static constexpr bool value = - noexcept(swap(std::declval(), std::declval())); - }; - - template - struct is_nothrow_swappable : std::false_type {}; - - } // namespace swappable - } // namespace detail - - using detail::swappable::is_swappable; - using detail::swappable::is_nothrow_swappable; - - // -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable : 4100) -#endif - template - inline constexpr auto invoke(F &&f, As &&... as) - RETURN(lib::forward(f)(lib::forward(as)...)) -#ifdef _MSC_VER -#pragma warning(pop) -#endif - - template - inline constexpr auto invoke(T B::*pmv, D &&d) - RETURN(lib::forward(d).*pmv) - - template - inline constexpr auto invoke(Pmv pmv, Ptr &&ptr) - RETURN((*lib::forward(ptr)).*pmv) - - template - inline constexpr auto invoke(T B::*pmf, D &&d, As &&... as) - RETURN((lib::forward(d).*pmf)(lib::forward(as)...)) - - template - inline constexpr auto invoke(Pmf pmf, Ptr &&ptr, As &&... as) - RETURN(((*lib::forward(ptr)).*pmf)(lib::forward(as)...)) - - namespace detail { - - template - struct invoke_result {}; - - template - struct invoke_result(), std::declval()...))>, - F, - Args...> - : identity(), std::declval()...))> {}; - - } // namespace detail - - template - using invoke_result = detail::invoke_result; - - template - using invoke_result_t = typename invoke_result::type; - - namespace detail { - - template - struct is_invocable : std::false_type {}; - - template - struct is_invocable>, F, Args...> - : std::true_type {}; - - template - struct is_invocable_r : std::false_type {}; - - template - struct is_invocable_r>, - R, - F, - Args...> - : std::is_convertible, R> {}; - - } // namespace detail - - template - using is_invocable = detail::is_invocable; - - template - using is_invocable_r = detail::is_invocable_r; - - // -#ifdef MPARK_BUILTIN_ADDRESSOF - template - inline constexpr T *addressof(T &arg) { - return __builtin_addressof(arg); - } -#else - namespace detail { - - namespace has_addressof_impl { - - struct fail; - - template - inline fail operator&(T &&); - - template - inline static constexpr bool impl() { - return (std::is_class::value || std::is_union::value) && - !std::is_same()), fail>::value; - } - - } // namespace has_addressof_impl - - template - using has_addressof = bool_constant()>; - - template - inline constexpr T *addressof(T &arg, std::true_type) { - return std::addressof(arg); - } - - template - inline constexpr T *addressof(T &arg, std::false_type) { - return &arg; - } - - } // namespace detail - - template - inline constexpr T *addressof(T &arg) { - return detail::addressof(arg, detail::has_addressof{}); - } -#endif - - template - inline constexpr T *addressof(const T &&) = delete; - - } // namespace cpp17 - - template - struct remove_all_extents : identity {}; - - template - struct remove_all_extents> : remove_all_extents {}; - - template - using remove_all_extents_t = typename remove_all_extents::type; - - template - using size_constant = std::integral_constant; - - template - struct indexed_type : size_constant, identity {}; - - template - using all = std::is_same, - integer_sequence>; - -#ifdef MPARK_TYPE_PACK_ELEMENT - template - using type_pack_element_t = __type_pack_element; -#else - template - struct type_pack_element_impl { - private: - template - struct set; - - template - struct set> : indexed_type... {}; - - template - inline static std::enable_if impl(indexed_type); - - inline static std::enable_if impl(...); - - public: - using type = decltype(impl(set>{})); - }; - - template - using type_pack_element = typename type_pack_element_impl::type; - - template - using type_pack_element_t = typename type_pack_element::type; -#endif - -#ifdef MPARK_TRIVIALITY_TYPE_TRAITS - using std::is_trivially_copy_constructible; - using std::is_trivially_move_constructible; - using std::is_trivially_copy_assignable; - using std::is_trivially_move_assignable; -#else - template - struct is_trivially_copy_constructible - : bool_constant< - std::is_copy_constructible::value && __has_trivial_copy(T)> {}; - - template - struct is_trivially_move_constructible : bool_constant<__is_trivial(T)> {}; - - template - struct is_trivially_copy_assignable - : bool_constant< - std::is_copy_assignable::value && __has_trivial_assign(T)> {}; - - template - struct is_trivially_move_assignable : bool_constant<__is_trivial(T)> {}; -#endif - - template - struct dependent_type : T {}; - - template - struct push_back; - - template - using push_back_t = typename push_back::type; - - template - struct push_back, J> { - using type = index_sequence; - }; - - } // namespace lib -} // namespace mpark - -#undef RETURN - -#endif // MPARK_LIB_HPP - - -namespace mpark { - -#ifdef MPARK_RETURN_TYPE_DEDUCTION - -#define AUTO auto -#define AUTO_RETURN(...) { return __VA_ARGS__; } - -#define AUTO_REFREF auto && -#define AUTO_REFREF_RETURN(...) { return __VA_ARGS__; } - -#define DECLTYPE_AUTO decltype(auto) -#define DECLTYPE_AUTO_RETURN(...) { return __VA_ARGS__; } - -#else - -#define AUTO auto -#define AUTO_RETURN(...) \ - -> lib::decay_t { return __VA_ARGS__; } - -#define AUTO_REFREF auto -#define AUTO_REFREF_RETURN(...) \ - -> decltype((__VA_ARGS__)) { \ - static_assert(std::is_reference::value, ""); \ - return __VA_ARGS__; \ - } - -#define DECLTYPE_AUTO auto -#define DECLTYPE_AUTO_RETURN(...) \ - -> decltype(__VA_ARGS__) { return __VA_ARGS__; } - -#endif - - class bad_variant_access : public std::exception { - public: - virtual const char *what() const noexcept { return "bad_variant_access"; } - }; - - [[noreturn]] inline void throw_bad_variant_access() { -#ifdef MPARK_EXCEPTIONS - throw bad_variant_access{}; -#else - std::terminate(); -#ifdef MPARK_BUILTIN_UNREACHABLE - __builtin_unreachable(); -#endif -#endif - } - - template - class variant; - - template - struct variant_size; - -#ifdef MPARK_VARIABLE_TEMPLATES - template - constexpr std::size_t variant_size_v = variant_size::value; -#endif - - template - struct variant_size : variant_size {}; - - template - struct variant_size : variant_size {}; - - template - struct variant_size : variant_size {}; - - template - struct variant_size> : lib::size_constant {}; - - template - struct variant_alternative; - - template - using variant_alternative_t = typename variant_alternative::type; - - template - struct variant_alternative - : std::add_const> {}; - - template - struct variant_alternative - : std::add_volatile> {}; - - template - struct variant_alternative - : std::add_cv> {}; - - template - struct variant_alternative> { - static_assert(I < sizeof...(Ts), - "Index out of bounds in std::variant_alternative<>"); - using type = lib::type_pack_element_t; - }; - - constexpr std::size_t variant_npos = static_cast(-1); - - namespace detail { - - constexpr std::size_t not_found = static_cast(-1); - constexpr std::size_t ambiguous = static_cast(-2); - -#ifdef MPARK_CPP14_CONSTEXPR - template - inline constexpr std::size_t find_index() { - constexpr lib::array matches = { - {std::is_same::value...} - }; - std::size_t result = not_found; - for (std::size_t i = 0; i < sizeof...(Ts); ++i) { - if (matches[i]) { - if (result != not_found) { - return ambiguous; - } - result = i; - } - } - return result; - } -#else - inline constexpr std::size_t find_index_impl(std::size_t result, - std::size_t) { - return result; - } - - template - inline constexpr std::size_t find_index_impl(std::size_t result, - std::size_t idx, - bool b, - Bs... bs) { - return b ? (result != not_found ? ambiguous - : find_index_impl(idx, idx + 1, bs...)) - : find_index_impl(result, idx + 1, bs...); - } - - template - inline constexpr std::size_t find_index() { - return find_index_impl(not_found, 0, std::is_same::value...); - } -#endif - - template - using find_index_sfinae_impl = - lib::enable_if_t>; - - template - using find_index_sfinae = find_index_sfinae_impl()>; - - template - struct find_index_checked_impl : lib::size_constant { - static_assert(I != not_found, "the specified type is not found."); - static_assert(I != ambiguous, "the specified type is ambiguous."); - }; - - template - using find_index_checked = find_index_checked_impl()>; - - struct valueless_t {}; - - enum class Trait { TriviallyAvailable, Available, Unavailable }; - - template class IsTriviallyAvailable, - template class IsAvailable> - inline constexpr Trait trait() { - return IsTriviallyAvailable::value - ? Trait::TriviallyAvailable - : IsAvailable::value ? Trait::Available - : Trait::Unavailable; - } - -#ifdef MPARK_CPP14_CONSTEXPR - template - inline constexpr Trait common_trait(Traits... traits) { - Trait result = Trait::TriviallyAvailable; - for (Trait t : {traits...}) { - if (static_cast(t) > static_cast(result)) { - result = t; - } - } - return result; - } -#else - inline constexpr Trait common_trait_impl(Trait result) { return result; } - - template - inline constexpr Trait common_trait_impl(Trait result, - Trait t, - Traits... ts) { - return static_cast(t) > static_cast(result) - ? common_trait_impl(t, ts...) - : common_trait_impl(result, ts...); - } - - template - inline constexpr Trait common_trait(Traits... ts) { - return common_trait_impl(Trait::TriviallyAvailable, ts...); - } -#endif - - template - struct traits { - static constexpr Trait copy_constructible_trait = - common_trait(trait()...); - - static constexpr Trait move_constructible_trait = - common_trait(trait()...); - - static constexpr Trait copy_assignable_trait = - common_trait(copy_constructible_trait, - trait()...); - - static constexpr Trait move_assignable_trait = - common_trait(move_constructible_trait, - trait()...); - - static constexpr Trait destructible_trait = - common_trait(trait()...); - }; - - namespace access { - - struct recursive_union { -#ifdef MPARK_RETURN_TYPE_DEDUCTION - template - inline static constexpr auto &&get_alt(V &&v, in_place_index_t<0>) { - return lib::forward(v).head_; - } - - template - inline static constexpr auto &&get_alt(V &&v, in_place_index_t) { - return get_alt(lib::forward(v).tail_, in_place_index_t{}); - } -#else - template - struct get_alt_impl { - template - inline constexpr AUTO_REFREF operator()(V &&v) const - AUTO_REFREF_RETURN(get_alt_impl{}(lib::forward(v).tail_)) - }; - - template - struct get_alt_impl<0, Dummy> { - template - inline constexpr AUTO_REFREF operator()(V &&v) const - AUTO_REFREF_RETURN(lib::forward(v).head_) - }; - - template - inline static constexpr AUTO_REFREF get_alt(V &&v, in_place_index_t) - AUTO_REFREF_RETURN(get_alt_impl{}(lib::forward(v))) -#endif - }; - - struct base { - template - inline static constexpr AUTO_REFREF get_alt(V &&v) - AUTO_REFREF_RETURN(recursive_union::get_alt( - data(lib::forward(v)), in_place_index_t{})) - }; - - struct variant { - template - inline static constexpr AUTO_REFREF get_alt(V &&v) - AUTO_REFREF_RETURN(base::get_alt(lib::forward(v).impl_)) - }; - - } // namespace access - - namespace visitation { - - struct base { - template - inline static constexpr const T &at(const T &elem) { - return elem; - } - - template - inline static constexpr const lib::remove_all_extents_t &at( - const lib::array &elems, std::size_t i, Is... is) { - return at(elems[i], is...); - } - - template - inline static constexpr int visit_visitor_return_type_check() { - static_assert(lib::all::value...>::value, - "`mpark::visit` requires the visitor to have a single " - "return type."); - return 0; - } - - template - inline static constexpr lib::array< - lib::common_type_t...>, - sizeof...(Fs)> - make_farray(Fs &&... fs) { - using result = lib::array...>, - sizeof...(Fs)>; - return visit_visitor_return_type_check...>(), - result{{lib::forward(fs)...}}; - } - - template - struct dispatcher { - template - struct impl { - inline static constexpr DECLTYPE_AUTO dispatch(F f, Vs... vs) - DECLTYPE_AUTO_RETURN(lib::invoke( - static_cast(f), - access::base::get_alt(static_cast(vs))...)) - }; - }; - - template - inline static constexpr AUTO make_dispatch(lib::index_sequence) - AUTO_RETURN(&dispatcher::template impl::dispatch) - - template - inline static constexpr AUTO make_fdiagonal_impl() - AUTO_RETURN(make_dispatch( - lib::index_sequence::value...>{})) - - template - inline static constexpr AUTO make_fdiagonal_impl( - lib::index_sequence) - AUTO_RETURN(make_farray(make_fdiagonal_impl()...)) - - template - inline static constexpr /* auto * */ auto make_fdiagonal() - -> decltype(make_fdiagonal_impl( - lib::make_index_sequence::size()>{})) { - static_assert(lib::all<(lib::decay_t::size() == - lib::decay_t::size())...>::value, - "all of the variants must be the same size."); - return make_fdiagonal_impl( - lib::make_index_sequence::size()>{}); - } - -#ifdef MPARK_RETURN_TYPE_DEDUCTION - template - inline static constexpr auto make_fmatrix_impl(Is is) { - return make_dispatch(is); - } - - template - inline static constexpr auto make_fmatrix_impl( - Is, lib::index_sequence, Ls... ls) { - return make_farray(make_fmatrix_impl( - lib::push_back_t{}, ls...)...); - } - - template - inline static constexpr auto make_fmatrix() { - return make_fmatrix_impl( - lib::index_sequence<>{}, - lib::make_index_sequence::size()>{}...); - } -#else - template - struct make_fmatrix_impl { - template - struct impl; - - template - struct impl { - inline constexpr AUTO operator()() const - AUTO_RETURN(make_dispatch(Is{})) - }; - - template - struct impl, Ls...> { - inline constexpr AUTO operator()() const - AUTO_RETURN( - make_farray(impl, Ls...>{}()...)) - }; - }; - - template - inline static constexpr AUTO make_fmatrix() - AUTO_RETURN( - typename make_fmatrix_impl::template impl< - lib::index_sequence<>, - lib::make_index_sequence::size()>...>{}()) -#endif - }; // namespace base - - template - using FDiagonal = decltype(base::make_fdiagonal()); - - template - struct fdiagonal { -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable : 4268) -#endif - static constexpr FDiagonal value = - base::make_fdiagonal(); -#ifdef _MSC_VER -#pragma warning(pop) -#endif - }; - - template - constexpr FDiagonal fdiagonal::value; - - template - using FMatrix = decltype(base::make_fmatrix()); - - template - struct fmatrix { -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable : 4268) -#endif - static constexpr FMatrix value = - base::make_fmatrix(); -#ifdef _MSC_VER -#pragma warning(pop) -#endif - }; - - template - constexpr FMatrix fmatrix::value; - - struct alt { - template - inline static constexpr DECLTYPE_AUTO visit_alt_at(std::size_t index, - Visitor &&visitor, - Vs &&... vs) - DECLTYPE_AUTO_RETURN(base::at( - fdiagonal(vs)))...>::value, - index)(lib::forward(visitor), - as_base(lib::forward(vs))...)) - - template - inline static constexpr DECLTYPE_AUTO visit_alt(Visitor &&visitor, - Vs &&... vs) - DECLTYPE_AUTO_RETURN(base::at( - fmatrix(vs)))...>::value, - vs.index()...)(lib::forward(visitor), - as_base(lib::forward(vs))...)) - }; - - struct variant { - private: - template - struct visit_exhaustive_visitor_check { - static_assert( - lib::is_invocable::value, - "`mpark::visit` requires the visitor to be exhaustive."); - -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable : 4100) -#endif - inline constexpr DECLTYPE_AUTO operator()(Visitor &&visitor, - Values &&... values) const - DECLTYPE_AUTO_RETURN(lib::invoke(lib::forward(visitor), - lib::forward(values)...)) -#ifdef _MSC_VER -#pragma warning(pop) -#endif - }; - - template - struct value_visitor { - Visitor &&visitor_; - - template - inline constexpr DECLTYPE_AUTO operator()(Alts &&... alts) const - DECLTYPE_AUTO_RETURN( - visit_exhaustive_visitor_check< - Visitor, - decltype((lib::forward(alts).value))...>{}( - lib::forward(visitor_), - lib::forward(alts).value...)) - }; - - template - inline static constexpr AUTO make_value_visitor(Visitor &&visitor) - AUTO_RETURN(value_visitor{lib::forward(visitor)}) - - public: - template - inline static constexpr DECLTYPE_AUTO visit_alt_at(std::size_t index, - Visitor &&visitor, - Vs &&... vs) - DECLTYPE_AUTO_RETURN( - alt::visit_alt_at(index, - lib::forward(visitor), - lib::forward(vs).impl_...)) - - template - inline static constexpr DECLTYPE_AUTO visit_alt(Visitor &&visitor, - Vs &&... vs) - DECLTYPE_AUTO_RETURN(alt::visit_alt(lib::forward(visitor), - lib::forward(vs).impl_...)) - - template - inline static constexpr DECLTYPE_AUTO visit_value_at(std::size_t index, - Visitor &&visitor, - Vs &&... vs) - DECLTYPE_AUTO_RETURN( - visit_alt_at(index, - make_value_visitor(lib::forward(visitor)), - lib::forward(vs)...)) - - template - inline static constexpr DECLTYPE_AUTO visit_value(Visitor &&visitor, - Vs &&... vs) - DECLTYPE_AUTO_RETURN( - visit_alt(make_value_visitor(lib::forward(visitor)), - lib::forward(vs)...)) - }; - - } // namespace visitation - - template - struct alt { - using value_type = T; - -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable : 4244) -#endif - template - inline explicit constexpr alt(in_place_t, Args &&... args) - : value(lib::forward(args)...) {} -#ifdef _MSC_VER -#pragma warning(pop) -#endif - - T value; - }; - - template - union recursive_union; - - template - union recursive_union {}; - -#define MPARK_VARIANT_RECURSIVE_UNION(destructible_trait, destructor) \ - template \ - union recursive_union { \ - public: \ - inline explicit constexpr recursive_union(valueless_t) noexcept \ - : dummy_{} {} \ - \ - template \ - inline explicit constexpr recursive_union(in_place_index_t<0>, \ - Args &&... args) \ - : head_(in_place_t{}, lib::forward(args)...) {} \ - \ - template \ - inline explicit constexpr recursive_union(in_place_index_t, \ - Args &&... args) \ - : tail_(in_place_index_t{}, lib::forward(args)...) {} \ - \ - recursive_union(const recursive_union &) = default; \ - recursive_union(recursive_union &&) = default; \ - \ - destructor \ - \ - recursive_union &operator=(const recursive_union &) = default; \ - recursive_union &operator=(recursive_union &&) = default; \ - \ - private: \ - char dummy_; \ - alt head_; \ - recursive_union tail_; \ - \ - friend struct access::recursive_union; \ - } - - MPARK_VARIANT_RECURSIVE_UNION(Trait::TriviallyAvailable, - ~recursive_union() = default;); - MPARK_VARIANT_RECURSIVE_UNION(Trait::Available, - ~recursive_union() {}); - MPARK_VARIANT_RECURSIVE_UNION(Trait::Unavailable, - ~recursive_union() = delete;); - -#undef MPARK_VARIANT_RECURSIVE_UNION - - using index_t = unsigned int; - - template - class base { - public: - inline explicit constexpr base(valueless_t tag) noexcept - : data_(tag), index_(static_cast(-1)) {} - - template - inline explicit constexpr base(in_place_index_t, Args &&... args) - : data_(in_place_index_t{}, lib::forward(args)...), - index_(I) {} - - inline constexpr bool valueless_by_exception() const noexcept { - return index_ == static_cast(-1); - } - - inline constexpr std::size_t index() const noexcept { - return valueless_by_exception() ? variant_npos : index_; - } - - protected: - using data_t = recursive_union; - - friend inline constexpr base &as_base(base &b) { return b; } - friend inline constexpr const base &as_base(const base &b) { return b; } - friend inline constexpr base &&as_base(base &&b) { return lib::move(b); } - friend inline constexpr const base &&as_base(const base &&b) { return lib::move(b); } - - friend inline constexpr data_t &data(base &b) { return b.data_; } - friend inline constexpr const data_t &data(const base &b) { return b.data_; } - friend inline constexpr data_t &&data(base &&b) { return lib::move(b).data_; } - friend inline constexpr const data_t &&data(const base &&b) { return lib::move(b).data_; } - - inline static constexpr std::size_t size() { return sizeof...(Ts); } - - data_t data_; - index_t index_; - - friend struct access::base; - friend struct visitation::base; - }; - - struct dtor { -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable : 4100) -#endif - template - inline void operator()(Alt &alt) const noexcept { alt.~Alt(); } -#ifdef _MSC_VER -#pragma warning(pop) -#endif - }; - -#if defined(_MSC_VER) && _MSC_VER < 1910 -#define INHERITING_CTOR(type, base) \ - template \ - inline explicit constexpr type(Args &&... args) \ - : base(lib::forward(args)...) {} -#else -#define INHERITING_CTOR(type, base) using base::base; -#endif - - template - class destructor; - -#define MPARK_VARIANT_DESTRUCTOR(destructible_trait, definition, destroy) \ - template \ - class destructor, destructible_trait> \ - : public base { \ - using super = base; \ - \ - public: \ - INHERITING_CTOR(destructor, super) \ - using super::operator=; \ - \ - destructor(const destructor &) = default; \ - destructor(destructor &&) = default; \ - definition \ - destructor &operator=(const destructor &) = default; \ - destructor &operator=(destructor &&) = default; \ - \ - protected: \ - destroy \ - } - - MPARK_VARIANT_DESTRUCTOR( - Trait::TriviallyAvailable, - ~destructor() = default;, - inline void destroy() noexcept { - this->index_ = static_cast(-1); - }); - - MPARK_VARIANT_DESTRUCTOR( - Trait::Available, - ~destructor() { destroy(); }, - inline void destroy() noexcept { - if (!this->valueless_by_exception()) { - visitation::alt::visit_alt(dtor{}, *this); - } - this->index_ = static_cast(-1); - }); - - MPARK_VARIANT_DESTRUCTOR( - Trait::Unavailable, - ~destructor() = delete;, - inline void destroy() noexcept = delete;); - -#undef MPARK_VARIANT_DESTRUCTOR - - template - class constructor : public destructor { - using super = destructor; - - public: - INHERITING_CTOR(constructor, super) - using super::operator=; - - protected: -#ifndef MPARK_GENERIC_LAMBDAS - struct ctor { - template - inline void operator()(LhsAlt &lhs_alt, RhsAlt &&rhs_alt) const { - constructor::construct_alt(lhs_alt, - lib::forward(rhs_alt).value); - } - }; -#endif - - template - inline static T &construct_alt(alt &a, Args &&... args) { - ::new (static_cast(lib::addressof(a))) - alt(in_place_t{}, lib::forward(args)...); - return a.value; - } - - template - inline static void generic_construct(constructor &lhs, Rhs &&rhs) { - lhs.destroy(); - if (!rhs.valueless_by_exception()) { - visitation::alt::visit_alt_at( - rhs.index(), -#ifdef MPARK_GENERIC_LAMBDAS - [](auto &lhs_alt, auto &&rhs_alt) { - constructor::construct_alt( - lhs_alt, lib::forward(rhs_alt).value); - } -#else - ctor{} -#endif - , - lhs, - lib::forward(rhs)); - lhs.index_ = rhs.index_; - } - } - }; - - template - class move_constructor; - -#define MPARK_VARIANT_MOVE_CONSTRUCTOR(move_constructible_trait, definition) \ - template \ - class move_constructor, move_constructible_trait> \ - : public constructor> { \ - using super = constructor>; \ - \ - public: \ - INHERITING_CTOR(move_constructor, super) \ - using super::operator=; \ - \ - move_constructor(const move_constructor &) = default; \ - definition \ - ~move_constructor() = default; \ - move_constructor &operator=(const move_constructor &) = default; \ - move_constructor &operator=(move_constructor &&) = default; \ - } - - MPARK_VARIANT_MOVE_CONSTRUCTOR( - Trait::TriviallyAvailable, - move_constructor(move_constructor &&that) = default;); - - MPARK_VARIANT_MOVE_CONSTRUCTOR( - Trait::Available, - move_constructor(move_constructor &&that) noexcept( - lib::all::value...>::value) - : move_constructor(valueless_t{}) { - this->generic_construct(*this, lib::move(that)); - }); - - MPARK_VARIANT_MOVE_CONSTRUCTOR( - Trait::Unavailable, - move_constructor(move_constructor &&) = delete;); - -#undef MPARK_VARIANT_MOVE_CONSTRUCTOR - - template - class copy_constructor; - -#define MPARK_VARIANT_COPY_CONSTRUCTOR(copy_constructible_trait, definition) \ - template \ - class copy_constructor, copy_constructible_trait> \ - : public move_constructor> { \ - using super = move_constructor>; \ - \ - public: \ - INHERITING_CTOR(copy_constructor, super) \ - using super::operator=; \ - \ - definition \ - copy_constructor(copy_constructor &&) = default; \ - ~copy_constructor() = default; \ - copy_constructor &operator=(const copy_constructor &) = default; \ - copy_constructor &operator=(copy_constructor &&) = default; \ - } - - MPARK_VARIANT_COPY_CONSTRUCTOR( - Trait::TriviallyAvailable, - copy_constructor(const copy_constructor &that) = default;); - - MPARK_VARIANT_COPY_CONSTRUCTOR( - Trait::Available, - copy_constructor(const copy_constructor &that) - : copy_constructor(valueless_t{}) { - this->generic_construct(*this, that); - }); - - MPARK_VARIANT_COPY_CONSTRUCTOR( - Trait::Unavailable, - copy_constructor(const copy_constructor &) = delete;); - -#undef MPARK_VARIANT_COPY_CONSTRUCTOR - - template - class assignment : public copy_constructor { - using super = copy_constructor; - - public: - INHERITING_CTOR(assignment, super) - using super::operator=; - - template - inline /* auto & */ auto emplace(Args &&... args) - -> decltype(this->construct_alt(access::base::get_alt(*this), - lib::forward(args)...)) { - this->destroy(); - auto &result = this->construct_alt(access::base::get_alt(*this), - lib::forward(args)...); - this->index_ = I; - return result; - } - - protected: -#ifndef MPARK_GENERIC_LAMBDAS - template - struct assigner { - template - inline void operator()(ThisAlt &this_alt, ThatAlt &&that_alt) const { - self->assign_alt(this_alt, lib::forward(that_alt).value); - } - assignment *self; - }; -#endif - - template - inline void assign_alt(alt &a, Arg &&arg) { - if (this->index() == I) { -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable : 4244) -#endif - a.value = lib::forward(arg); -#ifdef _MSC_VER -#pragma warning(pop) -#endif - } else { - struct { - void operator()(std::true_type) const { - this_->emplace(lib::forward(arg_)); - } - void operator()(std::false_type) const { - this_->emplace(T(lib::forward(arg_))); - } - assignment *this_; - Arg &&arg_; - } impl{this, lib::forward(arg)}; - impl(lib::bool_constant< - std::is_nothrow_constructible::value || - !std::is_nothrow_move_constructible::value>{}); - } - } - - template - inline void generic_assign(That &&that) { - if (this->valueless_by_exception() && that.valueless_by_exception()) { - // do nothing. - } else if (that.valueless_by_exception()) { - this->destroy(); - } else { - visitation::alt::visit_alt_at( - that.index(), -#ifdef MPARK_GENERIC_LAMBDAS - [this](auto &this_alt, auto &&that_alt) { - this->assign_alt( - this_alt, lib::forward(that_alt).value); - } -#else - assigner{this} -#endif - , - *this, - lib::forward(that)); - } - } - }; - - template - class move_assignment; - -#define MPARK_VARIANT_MOVE_ASSIGNMENT(move_assignable_trait, definition) \ - template \ - class move_assignment, move_assignable_trait> \ - : public assignment> { \ - using super = assignment>; \ - \ - public: \ - INHERITING_CTOR(move_assignment, super) \ - using super::operator=; \ - \ - move_assignment(const move_assignment &) = default; \ - move_assignment(move_assignment &&) = default; \ - ~move_assignment() = default; \ - move_assignment &operator=(const move_assignment &) = default; \ - definition \ - } - - MPARK_VARIANT_MOVE_ASSIGNMENT( - Trait::TriviallyAvailable, - move_assignment &operator=(move_assignment &&that) = default;); - - MPARK_VARIANT_MOVE_ASSIGNMENT( - Trait::Available, - move_assignment & - operator=(move_assignment &&that) noexcept( - lib::all<(std::is_nothrow_move_constructible::value && - std::is_nothrow_move_assignable::value)...>::value) { - this->generic_assign(lib::move(that)); - return *this; - }); - - MPARK_VARIANT_MOVE_ASSIGNMENT( - Trait::Unavailable, - move_assignment &operator=(move_assignment &&) = delete;); - -#undef MPARK_VARIANT_MOVE_ASSIGNMENT - - template - class copy_assignment; - -#define MPARK_VARIANT_COPY_ASSIGNMENT(copy_assignable_trait, definition) \ - template \ - class copy_assignment, copy_assignable_trait> \ - : public move_assignment> { \ - using super = move_assignment>; \ - \ - public: \ - INHERITING_CTOR(copy_assignment, super) \ - using super::operator=; \ - \ - copy_assignment(const copy_assignment &) = default; \ - copy_assignment(copy_assignment &&) = default; \ - ~copy_assignment() = default; \ - definition \ - copy_assignment &operator=(copy_assignment &&) = default; \ - } - - MPARK_VARIANT_COPY_ASSIGNMENT( - Trait::TriviallyAvailable, - copy_assignment &operator=(const copy_assignment &that) = default;); - - MPARK_VARIANT_COPY_ASSIGNMENT( - Trait::Available, - copy_assignment &operator=(const copy_assignment &that) { - this->generic_assign(that); - return *this; - }); - - MPARK_VARIANT_COPY_ASSIGNMENT( - Trait::Unavailable, - copy_assignment &operator=(const copy_assignment &) = delete;); - -#undef MPARK_VARIANT_COPY_ASSIGNMENT - - template - class impl : public copy_assignment> { - using super = copy_assignment>; - - public: - INHERITING_CTOR(impl, super) - using super::operator=; - - template - inline void assign(Arg &&arg) { - this->assign_alt(access::base::get_alt(*this), - lib::forward(arg)); - } - - inline void swap(impl &that) { - if (this->valueless_by_exception() && that.valueless_by_exception()) { - // do nothing. - } else if (this->index() == that.index()) { - visitation::alt::visit_alt_at(this->index(), -#ifdef MPARK_GENERIC_LAMBDAS - [](auto &this_alt, auto &that_alt) { - using std::swap; - swap(this_alt.value, - that_alt.value); - } -#else - swapper{} -#endif - , - *this, - that); - } else { - impl *lhs = this; - impl *rhs = lib::addressof(that); - if (lhs->move_nothrow() && !rhs->move_nothrow()) { - std::swap(lhs, rhs); - } - impl tmp(lib::move(*rhs)); -#ifdef MPARK_EXCEPTIONS - // EXTENSION: When the move construction of `lhs` into `rhs` throws - // and `tmp` is nothrow move constructible then we move `tmp` back - // into `rhs` and provide the strong exception safety guarantee. - try { - this->generic_construct(*rhs, lib::move(*lhs)); - } catch (...) { - if (tmp.move_nothrow()) { - this->generic_construct(*rhs, lib::move(tmp)); - } - throw; - } -#else - this->generic_construct(*rhs, lib::move(*lhs)); -#endif - this->generic_construct(*lhs, lib::move(tmp)); - } - } - - private: -#ifndef MPARK_GENERIC_LAMBDAS - struct swapper { - template - inline void operator()(ThisAlt &this_alt, ThatAlt &that_alt) const { - using std::swap; - swap(this_alt.value, that_alt.value); - } - }; -#endif - - inline constexpr bool move_nothrow() const { - return this->valueless_by_exception() || - lib::array{ - {std::is_nothrow_move_constructible::value...} - }[this->index()]; - } - }; - - template - struct overload_leaf { - using F = lib::size_constant (*)(T); - operator F() const { return nullptr; } - }; - - template - struct overload_impl { - private: - template - struct impl; - - template - struct impl> : overload_leaf... {}; - - public: - using type = impl>; - }; - - template - using overload = typename overload_impl::type; - - template - using best_match = lib::invoke_result_t, T &&>; - - template - struct is_in_place_index : std::false_type {}; - - template - struct is_in_place_index> : std::true_type {}; - - template - struct is_in_place_type : std::false_type {}; - - template - struct is_in_place_type> : std::true_type {}; - - } // detail - - template - class variant { - static_assert(0 < sizeof...(Ts), - "variant must consist of at least one alternative."); - - static_assert(lib::all::value...>::value, - "variant can not have an array type as an alternative."); - - static_assert(lib::all::value...>::value, - "variant can not have a reference type as an alternative."); - - static_assert(lib::all::value...>::value, - "variant can not have a void type as an alternative."); - - public: - template < - typename Front = lib::type_pack_element_t<0, Ts...>, - lib::enable_if_t::value, int> = 0> - inline constexpr variant() noexcept( - std::is_nothrow_default_constructible::value) - : impl_(in_place_index_t<0>{}) {} - - variant(const variant &) = default; - variant(variant &&) = default; - - template < - typename Arg, - typename Decayed = lib::decay_t, - lib::enable_if_t::value, int> = 0, - lib::enable_if_t::value, int> = 0, - lib::enable_if_t::value, int> = 0, - std::size_t I = detail::best_match::value, - typename T = lib::type_pack_element_t, - lib::enable_if_t::value, int> = 0> - inline constexpr variant(Arg &&arg) noexcept( - std::is_nothrow_constructible::value) - : impl_(in_place_index_t{}, lib::forward(arg)) {} - - template < - std::size_t I, - typename... Args, - typename T = lib::type_pack_element_t, - lib::enable_if_t::value, int> = 0> - inline explicit constexpr variant( - in_place_index_t, - Args &&... args) noexcept(std::is_nothrow_constructible::value) - : impl_(in_place_index_t{}, lib::forward(args)...) {} - - template < - std::size_t I, - typename Up, - typename... Args, - typename T = lib::type_pack_element_t, - lib::enable_if_t &, - Args...>::value, - int> = 0> - inline explicit constexpr variant( - in_place_index_t, - std::initializer_list il, - Args &&... args) noexcept(std:: - is_nothrow_constructible< - T, - std::initializer_list &, - Args...>::value) - : impl_(in_place_index_t{}, il, lib::forward(args)...) {} - - template < - typename T, - typename... Args, - std::size_t I = detail::find_index_sfinae::value, - lib::enable_if_t::value, int> = 0> - inline explicit constexpr variant( - in_place_type_t, - Args &&... args) noexcept(std::is_nothrow_constructible::value) - : impl_(in_place_index_t{}, lib::forward(args)...) {} - - template < - typename T, - typename Up, - typename... Args, - std::size_t I = detail::find_index_sfinae::value, - lib::enable_if_t &, - Args...>::value, - int> = 0> - inline explicit constexpr variant( - in_place_type_t, - std::initializer_list il, - Args &&... args) noexcept(std:: - is_nothrow_constructible< - T, - std::initializer_list &, - Args...>::value) - : impl_(in_place_index_t{}, il, lib::forward(args)...) {} - - ~variant() = default; - - variant &operator=(const variant &) = default; - variant &operator=(variant &&) = default; - - template , variant>::value, - int> = 0, - std::size_t I = detail::best_match::value, - typename T = lib::type_pack_element_t, - lib::enable_if_t<(std::is_assignable::value && - std::is_constructible::value), - int> = 0> - inline variant &operator=(Arg &&arg) noexcept( - (std::is_nothrow_assignable::value && - std::is_nothrow_constructible::value)) { - impl_.template assign(lib::forward(arg)); - return *this; - } - - template < - std::size_t I, - typename... Args, - typename T = lib::type_pack_element_t, - lib::enable_if_t::value, int> = 0> - inline T &emplace(Args &&... args) { - return impl_.template emplace(lib::forward(args)...); - } - - template < - std::size_t I, - typename Up, - typename... Args, - typename T = lib::type_pack_element_t, - lib::enable_if_t &, - Args...>::value, - int> = 0> - inline T &emplace(std::initializer_list il, Args &&... args) { - return impl_.template emplace(il, lib::forward(args)...); - } - - template < - typename T, - typename... Args, - std::size_t I = detail::find_index_sfinae::value, - lib::enable_if_t::value, int> = 0> - inline T &emplace(Args &&... args) { - return impl_.template emplace(lib::forward(args)...); - } - - template < - typename T, - typename Up, - typename... Args, - std::size_t I = detail::find_index_sfinae::value, - lib::enable_if_t &, - Args...>::value, - int> = 0> - inline T &emplace(std::initializer_list il, Args &&... args) { - return impl_.template emplace(il, lib::forward(args)...); - } - - inline constexpr bool valueless_by_exception() const noexcept { - return impl_.valueless_by_exception(); - } - - inline constexpr std::size_t index() const noexcept { - return impl_.index(); - } - - template , - Dummy>::value && - lib::dependent_type, - Dummy>::value)...>::value, - int> = 0> - inline void swap(variant &that) noexcept( - lib::all<(std::is_nothrow_move_constructible::value && - lib::is_nothrow_swappable::value)...>::value) { - impl_.swap(that.impl_); - } - - private: - detail::impl impl_; - - friend struct detail::access::variant; - friend struct detail::visitation::variant; - }; - - template - inline constexpr bool holds_alternative(const variant &v) noexcept { - return v.index() == I; - } - - template - inline constexpr bool holds_alternative(const variant &v) noexcept { - return holds_alternative::value>(v); - } - - namespace detail { - template - struct generic_get_impl { - constexpr generic_get_impl(int) {} - - constexpr AUTO_REFREF operator()(V &&v) const - AUTO_REFREF_RETURN( - access::variant::get_alt(lib::forward(v)).value) - }; - - template - inline constexpr AUTO_REFREF generic_get(V &&v) - AUTO_REFREF_RETURN(generic_get_impl( - holds_alternative(v) ? 0 : (throw_bad_variant_access(), 0))( - lib::forward(v))) - } // namespace detail - - template - inline constexpr variant_alternative_t> &get( - variant &v) { - return detail::generic_get(v); - } - - template - inline constexpr variant_alternative_t> &&get( - variant &&v) { - return detail::generic_get(lib::move(v)); - } - - template - inline constexpr const variant_alternative_t> &get( - const variant &v) { - return detail::generic_get(v); - } - - template - inline constexpr const variant_alternative_t> &&get( - const variant &&v) { - return detail::generic_get(lib::move(v)); - } - - template - inline constexpr T &get(variant &v) { - return get::value>(v); - } - - template - inline constexpr T &&get(variant &&v) { - return get::value>(lib::move(v)); - } - - template - inline constexpr const T &get(const variant &v) { - return get::value>(v); - } - - template - inline constexpr const T &&get(const variant &&v) { - return get::value>(lib::move(v)); - } - - namespace detail { - - template - inline constexpr /* auto * */ AUTO generic_get_if(V *v) noexcept - AUTO_RETURN(v && holds_alternative(*v) - ? lib::addressof(access::variant::get_alt(*v).value) - : nullptr) - - } // namespace detail - - template - inline constexpr lib::add_pointer_t>> - get_if(variant *v) noexcept { - return detail::generic_get_if(v); - } - - template - inline constexpr lib::add_pointer_t< - const variant_alternative_t>> - get_if(const variant *v) noexcept { - return detail::generic_get_if(v); - } - - template - inline constexpr lib::add_pointer_t - get_if(variant *v) noexcept { - return get_if::value>(v); - } - - template - inline constexpr lib::add_pointer_t - get_if(const variant *v) noexcept { - return get_if::value>(v); - } - - template - inline constexpr bool operator==(const variant &lhs, - const variant &rhs) { - using detail::visitation::variant; - using lib::equal_to; -#ifdef MPARK_CPP14_CONSTEXPR - if (lhs.index() != rhs.index()) return false; - if (lhs.valueless_by_exception()) return true; - return variant::visit_value_at(lhs.index(), equal_to{}, lhs, rhs); -#else - return lhs.index() == rhs.index() && - (lhs.valueless_by_exception() || - variant::visit_value_at(lhs.index(), equal_to{}, lhs, rhs)); -#endif - } - - template - inline constexpr bool operator!=(const variant &lhs, - const variant &rhs) { - using detail::visitation::variant; - using lib::not_equal_to; -#ifdef MPARK_CPP14_CONSTEXPR - if (lhs.index() != rhs.index()) return true; - if (lhs.valueless_by_exception()) return false; - return variant::visit_value_at(lhs.index(), not_equal_to{}, lhs, rhs); -#else - return lhs.index() != rhs.index() || - (!lhs.valueless_by_exception() && - variant::visit_value_at(lhs.index(), not_equal_to{}, lhs, rhs)); -#endif - } - - template - inline constexpr bool operator<(const variant &lhs, - const variant &rhs) { - using detail::visitation::variant; - using lib::less; -#ifdef MPARK_CPP14_CONSTEXPR - if (rhs.valueless_by_exception()) return false; - if (lhs.valueless_by_exception()) return true; - if (lhs.index() < rhs.index()) return true; - if (lhs.index() > rhs.index()) return false; - return variant::visit_value_at(lhs.index(), less{}, lhs, rhs); -#else - return !rhs.valueless_by_exception() && - (lhs.valueless_by_exception() || lhs.index() < rhs.index() || - (lhs.index() == rhs.index() && - variant::visit_value_at(lhs.index(), less{}, lhs, rhs))); -#endif - } - - template - inline constexpr bool operator>(const variant &lhs, - const variant &rhs) { - using detail::visitation::variant; - using lib::greater; -#ifdef MPARK_CPP14_CONSTEXPR - if (lhs.valueless_by_exception()) return false; - if (rhs.valueless_by_exception()) return true; - if (lhs.index() > rhs.index()) return true; - if (lhs.index() < rhs.index()) return false; - return variant::visit_value_at(lhs.index(), greater{}, lhs, rhs); -#else - return !lhs.valueless_by_exception() && - (rhs.valueless_by_exception() || lhs.index() > rhs.index() || - (lhs.index() == rhs.index() && - variant::visit_value_at(lhs.index(), greater{}, lhs, rhs))); -#endif - } - - template - inline constexpr bool operator<=(const variant &lhs, - const variant &rhs) { - using detail::visitation::variant; - using lib::less_equal; -#ifdef MPARK_CPP14_CONSTEXPR - if (lhs.valueless_by_exception()) return true; - if (rhs.valueless_by_exception()) return false; - if (lhs.index() < rhs.index()) return true; - if (lhs.index() > rhs.index()) return false; - return variant::visit_value_at(lhs.index(), less_equal{}, lhs, rhs); -#else - return lhs.valueless_by_exception() || - (!rhs.valueless_by_exception() && - (lhs.index() < rhs.index() || - (lhs.index() == rhs.index() && - variant::visit_value_at(lhs.index(), less_equal{}, lhs, rhs)))); -#endif - } - - template - inline constexpr bool operator>=(const variant &lhs, - const variant &rhs) { - using detail::visitation::variant; - using lib::greater_equal; -#ifdef MPARK_CPP14_CONSTEXPR - if (rhs.valueless_by_exception()) return true; - if (lhs.valueless_by_exception()) return false; - if (lhs.index() > rhs.index()) return true; - if (lhs.index() < rhs.index()) return false; - return variant::visit_value_at(lhs.index(), greater_equal{}, lhs, rhs); -#else - return rhs.valueless_by_exception() || - (!lhs.valueless_by_exception() && - (lhs.index() > rhs.index() || - (lhs.index() == rhs.index() && - variant::visit_value_at( - lhs.index(), greater_equal{}, lhs, rhs)))); -#endif - } - - struct monostate {}; - - inline constexpr bool operator<(monostate, monostate) noexcept { - return false; - } - - inline constexpr bool operator>(monostate, monostate) noexcept { - return false; - } - - inline constexpr bool operator<=(monostate, monostate) noexcept { - return true; - } - - inline constexpr bool operator>=(monostate, monostate) noexcept { - return true; - } - - inline constexpr bool operator==(monostate, monostate) noexcept { - return true; - } - - inline constexpr bool operator!=(monostate, monostate) noexcept { - return false; - } - -#ifdef MPARK_CPP14_CONSTEXPR - namespace detail { - - inline constexpr bool all(std::initializer_list bs) { - for (bool b : bs) { - if (!b) { - return false; - } - } - return true; - } - - } // namespace detail - - template - inline constexpr decltype(auto) visit(Visitor &&visitor, Vs &&... vs) { - return (detail::all({!vs.valueless_by_exception()...}) - ? (void)0 - : throw_bad_variant_access()), - detail::visitation::variant::visit_value( - lib::forward(visitor), lib::forward(vs)...); - } -#else - namespace detail { - - template - inline constexpr bool all_impl(const lib::array &bs, - std::size_t idx) { - return idx >= N || (bs[idx] && all_impl(bs, idx + 1)); - } - - template - inline constexpr bool all(const lib::array &bs) { - return all_impl(bs, 0); - } - - } // namespace detail - - template - inline constexpr DECLTYPE_AUTO visit(Visitor &&visitor, Vs &&... vs) - DECLTYPE_AUTO_RETURN( - (detail::all( - lib::array{{!vs.valueless_by_exception()...}}) - ? (void)0 - : throw_bad_variant_access()), - detail::visitation::variant::visit_value(lib::forward(visitor), - lib::forward(vs)...)) -#endif - - template - inline auto swap(variant &lhs, - variant &rhs) noexcept(noexcept(lhs.swap(rhs))) - -> decltype(lhs.swap(rhs)) { - lhs.swap(rhs); - } - - namespace detail { - - template - using enabled_type = T; - - namespace hash { - - template - constexpr bool meets_requirements() { - return std::is_copy_constructible::value && - std::is_move_constructible::value && - lib::is_invocable_r::value; - } - - template - constexpr bool is_enabled() { - using H = std::hash; - return meets_requirements() && - std::is_default_constructible::value && - std::is_copy_assignable::value && - std::is_move_assignable::value; - } - - } // namespace hash - - } // namespace detail - -#undef AUTO -#undef AUTO_RETURN - -#undef AUTO_REFREF -#undef AUTO_REFREF_RETURN - -#undef DECLTYPE_AUTO -#undef DECLTYPE_AUTO_RETURN - -} // namespace mpark - -namespace std { - - template - struct hash, - mpark::lib::enable_if_t>()...>::value>>> { - using argument_type = mpark::variant; - using result_type = std::size_t; - - inline result_type operator()(const argument_type &v) const { - using mpark::detail::visitation::variant; - std::size_t result = - v.valueless_by_exception() - ? 299792458 // Random value chosen by the universe upon creation - : variant::visit_alt( -#ifdef MPARK_GENERIC_LAMBDAS - [](const auto &alt) { - using alt_type = mpark::lib::decay_t; - using value_type = mpark::lib::remove_const_t< - typename alt_type::value_type>; - return hash{}(alt.value); - } -#else - hasher{} -#endif - , - v); - return hash_combine(result, hash{}(v.index())); - } - - private: -#ifndef MPARK_GENERIC_LAMBDAS - struct hasher { - template - inline std::size_t operator()(const Alt &alt) const { - using alt_type = mpark::lib::decay_t; - using value_type = - mpark::lib::remove_const_t; - return hash{}(alt.value); - } - }; -#endif - - static std::size_t hash_combine(std::size_t lhs, std::size_t rhs) { - return lhs ^= rhs + 0x9e3779b9 + (lhs << 6) + (lhs >> 2); - } - }; - - template <> - struct hash { - using argument_type = mpark::monostate; - using result_type = std::size_t; - - inline result_type operator()(const argument_type &) const noexcept { - return 66740831; // return a fundamentally attractive random value. - } - }; - -} // namespace std - -#endif // MPARK_VARIANT_HPP -- cgit 1.4.1