diff options
Diffstat (limited to 'absl/types/internal/variant.h')
| -rw-r--r-- | absl/types/internal/variant.h | 74 |
1 files changed, 44 insertions, 30 deletions
diff --git a/absl/types/internal/variant.h b/absl/types/internal/variant.h index 875f88e0..4f29f617 100644 --- a/absl/types/internal/variant.h +++ b/absl/types/internal/variant.h @@ -4,7 +4,7 @@ // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // -// http://www.apache.org/licenses/LICENSE-2.0 +// https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, @@ -15,7 +15,6 @@ // Implementation details of absl/types/variant.h, pulled into a // separate file to avoid cluttering the top of the API header with // implementation details. -// #ifndef ABSL_TYPES_variant_internal_H_ #define ABSL_TYPES_variant_internal_H_ @@ -41,7 +40,7 @@ #if !defined(ABSL_HAVE_STD_VARIANT) namespace absl { -inline namespace lts_2018_12_18 { +inline namespace lts_2019_08_08 { template <class... Types> class variant; @@ -206,7 +205,7 @@ template <class Op, class... Vs> using VisitIndicesResultT = typename VisitIndicesResultImpl<Op, Vs...>::type; template <class ReturnType, class FunctionObject, class EndIndices, - std::size_t... BoundIndices> + class BoundIndices> struct MakeVisitationMatrix; template <class ReturnType, class FunctionObject, std::size_t... Indices> @@ -220,7 +219,7 @@ constexpr ReturnType call_with_indices(FunctionObject&& function) { template <class ReturnType, class FunctionObject, std::size_t... BoundIndices> struct MakeVisitationMatrix<ReturnType, FunctionObject, index_sequence<>, - BoundIndices...> { + index_sequence<BoundIndices...>> { using ResultType = ReturnType (*)(FunctionObject&&); static constexpr ResultType Run() { return &call_with_indices<ReturnType, FunctionObject, @@ -228,24 +227,34 @@ struct MakeVisitationMatrix<ReturnType, FunctionObject, index_sequence<>, } }; +template <typename Is, std::size_t J> +struct AppendToIndexSequence; + +template <typename Is, std::size_t J> +using AppendToIndexSequenceT = typename AppendToIndexSequence<Is, J>::type; + +template <std::size_t... Is, std::size_t J> +struct AppendToIndexSequence<index_sequence<Is...>, J> { + using type = index_sequence<Is..., J>; +}; + template <class ReturnType, class FunctionObject, class EndIndices, - class CurrIndices, std::size_t... BoundIndices> + class CurrIndices, class BoundIndices> struct MakeVisitationMatrixImpl; -template <class ReturnType, class FunctionObject, std::size_t... EndIndices, - std::size_t... CurrIndices, std::size_t... BoundIndices> -struct MakeVisitationMatrixImpl< - ReturnType, FunctionObject, index_sequence<EndIndices...>, - index_sequence<CurrIndices...>, BoundIndices...> { +template <class ReturnType, class FunctionObject, class EndIndices, + std::size_t... CurrIndices, class BoundIndices> +struct MakeVisitationMatrixImpl<ReturnType, FunctionObject, EndIndices, + index_sequence<CurrIndices...>, BoundIndices> { using ResultType = SimpleArray< - typename MakeVisitationMatrix<ReturnType, FunctionObject, - index_sequence<EndIndices...>>::ResultType, + typename MakeVisitationMatrix<ReturnType, FunctionObject, EndIndices, + index_sequence<>>::ResultType, sizeof...(CurrIndices)>; static constexpr ResultType Run() { - return {{MakeVisitationMatrix<ReturnType, FunctionObject, - index_sequence<EndIndices...>, - BoundIndices..., CurrIndices>::Run()...}}; + return {{MakeVisitationMatrix< + ReturnType, FunctionObject, EndIndices, + AppendToIndexSequenceT<BoundIndices, CurrIndices>>::Run()...}}; } }; @@ -253,10 +262,11 @@ template <class ReturnType, class FunctionObject, std::size_t HeadEndIndex, std::size_t... TailEndIndices, std::size_t... BoundIndices> struct MakeVisitationMatrix<ReturnType, FunctionObject, index_sequence<HeadEndIndex, TailEndIndices...>, - BoundIndices...> - : MakeVisitationMatrixImpl< - ReturnType, FunctionObject, index_sequence<TailEndIndices...>, - absl::make_index_sequence<HeadEndIndex>, BoundIndices...> {}; + index_sequence<BoundIndices...>> + : MakeVisitationMatrixImpl<ReturnType, FunctionObject, + index_sequence<TailEndIndices...>, + absl::make_index_sequence<HeadEndIndex>, + index_sequence<BoundIndices...>> {}; struct UnreachableSwitchCase { template <class Op> @@ -425,7 +435,8 @@ struct VisitIndicesFallback { static VisitIndicesResultT<Op, SizeT...> Run(Op&& op, SizeT... indices) { return AccessSimpleArray( MakeVisitationMatrix<VisitIndicesResultT<Op, SizeT...>, Op, - index_sequence<(EndIndices + 1)...>>::Run(), + index_sequence<(EndIndices + 1)...>, + index_sequence<>>::Run(), (indices + 1)...)(absl::forward<Op>(op)); } }; @@ -839,8 +850,8 @@ struct ImaginaryFun<variant<H, T...>, I> : ImaginaryFun<variant<T...>, I + 1> { // NOTE: const& and && are used instead of by-value due to lack of guaranteed // move elision of C++17. This may have other minor differences, but tests // pass. - static SizeT<I> Run(const H&); - static SizeT<I> Run(H&&); + static SizeT<I> Run(const H&, SizeT<I>); + static SizeT<I> Run(H&&, SizeT<I>); }; // The following metafunctions are used in constructor and assignment @@ -862,7 +873,8 @@ struct ConversionIsPossibleImpl : std::false_type {}; template <class Variant, class T> struct ConversionIsPossibleImpl< - Variant, T, void_t<decltype(ImaginaryFun<Variant>::Run(std::declval<T>()))>> + Variant, T, + void_t<decltype(ImaginaryFun<Variant>::Run(std::declval<T>(), {}))>> : std::true_type {}; template <class Variant, class T> @@ -870,8 +882,9 @@ struct ConversionIsPossible : ConversionIsPossibleImpl<Variant, T>::type {}; template <class Variant, class T> struct IndexOfConstructedType< - Variant, T, void_t<decltype(ImaginaryFun<Variant>::Run(std::declval<T>()))>> - : decltype(ImaginaryFun<Variant>::Run(std::declval<T>())) {}; + Variant, T, + void_t<decltype(ImaginaryFun<Variant>::Run(std::declval<T>(), {}))>> + : decltype(ImaginaryFun<Variant>::Run(std::declval<T>(), {})) {}; template <std::size_t... Is> struct ContainsVariantNPos @@ -1550,8 +1563,8 @@ struct SwapSameIndex { variant<Types...>* w; template <std::size_t I> void operator()(SizeT<I>) const { - using std::swap; - swap(VariantCoreAccess::Access<I>(*v), VariantCoreAccess::Access<I>(*w)); + type_traits_internal::Swap(VariantCoreAccess::Access<I>(*v), + VariantCoreAccess::Access<I>(*w)); } void operator()(SizeT<variant_npos>) const {} @@ -1606,11 +1619,12 @@ struct VariantHashVisitor { template <typename Variant, typename... Ts> struct VariantHashBase<Variant, absl::enable_if_t<absl::conjunction< - type_traits_internal::IsHashEnabled<Ts>...>::value>, + type_traits_internal::IsHashable<Ts>...>::value>, Ts...> { using argument_type = Variant; using result_type = size_t; size_t operator()(const Variant& var) const { + type_traits_internal::AssertHashEnabled<Ts...>(); if (var.valueless_by_exception()) { return 239799884; } @@ -1625,7 +1639,7 @@ struct VariantHashBase<Variant, }; } // namespace variant_internal -} // inline namespace lts_2018_12_18 +} // inline namespace lts_2019_08_08 } // namespace absl #endif // !defined(ABSL_HAVE_STD_VARIANT) |