diff options
Diffstat (limited to 'absl/types')
| -rw-r--r-- | absl/types/internal/variant.h | 48 |
1 files changed, 30 insertions, 18 deletions
diff --git a/absl/types/internal/variant.h b/absl/types/internal/variant.h index 85201b4ae1f9..19de2e137593 100644 --- a/absl/types/internal/variant.h +++ b/absl/types/internal/variant.h @@ -204,7 +204,7 @@ 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> @@ -218,7 +218,7 @@ 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, @@ -226,24 +226,34 @@ 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()...}}; } }; @@ -251,10 +261,11 @@ 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> @@ -423,7 +434,8 @@ 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)); } }; |