From fcb104594b0bb4b8ac306cb2f55ecdad40974683 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Tue, 4 Dec 2018 11:01:12 -0800 Subject: Creation of LTS branch "lts_2018_12_18" - 44b0fafc62d9b8f192e8180cbe9c4b806b339d57 Export of internal Abseil changes. by Abseil Team - 926bfeb9fff223429c12224b7514243886323e8d Export of internal Abseil changes. by Abseil Team - 13327debebc5c2d1d4991b69fe50450e340e50e4 Export of internal Abseil changes. by Abseil Team - 3088e76c597e068479e82508b1770a7ad0c806b6 Export of internal Abseil changes. by Abseil Team - f6ae816808cd913e0e2b3e2af14f328fa1071af0 Export of internal Abseil changes. by Abseil Team - a06c4a1d9093137b7217a5aaba8920d62e835dc0 Export of internal Abseil changes. by Abseil Team - 7b46e1d31a6b08b1c6da2a13e7b151a20446fa07 Export of internal Abseil changes. by Abseil Team - 070f6e47b33a2909d039e620c873204f78809492 Export of internal Abseil changes. by Abseil Team - 7990fd459e9339467814ddb95000c87cb1e4d945 Export of internal Abseil changes. by Abseil Team - 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87a4c07856e7dc69958019d47b2f02ae47746ec0 Export of internal Abseil changes. by Abseil Team - 4491d606df34c44efda47b6d17b605262f17e182 Export of internal Abseil changes. by Abseil Team GitOrigin-RevId: 44b0fafc62d9b8f192e8180cbe9c4b806b339d57 Change-Id: I2c427b5b41b2d34101922048b00f3d9dafcb498d --- absl/types/internal/variant.h | 88 +++++++++++++++++++++---------------------- 1 file changed, 43 insertions(+), 45 deletions(-) (limited to 'absl/types/internal/variant.h') diff --git a/absl/types/internal/variant.h b/absl/types/internal/variant.h index 3b884647..875f88e0 100644 --- a/absl/types/internal/variant.h +++ b/absl/types/internal/variant.h @@ -1,4 +1,4 @@ -// Copyright 2017 The Abseil Authors. +// Copyright 2018 The Abseil Authors. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. @@ -15,6 +15,7 @@ // 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_ @@ -37,8 +38,10 @@ #include "absl/types/bad_variant_access.h" #include "absl/utility/utility.h" +#if !defined(ABSL_HAVE_STD_VARIANT) + namespace absl { -inline namespace lts_2018_06_20 { +inline namespace lts_2018_12_18 { template class variant; @@ -580,12 +583,9 @@ struct VariantCoreAccess { self.index_ = other.index(); } + // Access a variant alternative, assuming the index is correct. template static VariantAccessResult Access(Variant&& self) { - if (ABSL_PREDICT_FALSE(self.index_ != I)) { - TypedThrowBadVariantAccess>(); - } - // This cast instead of invocation of AccessUnion with an rvalue is a // workaround for msvc. Without this there is a runtime failure when dealing // with rvalues. @@ -594,6 +594,16 @@ struct VariantCoreAccess { variant_internal::AccessUnion(self.state_, SizeT())); } + // Access a variant alternative, throwing if the index is incorrect. + template + static VariantAccessResult CheckedAccess(Variant&& self) { + if (ABSL_PREDICT_FALSE(self.index_ != I)) { + TypedThrowBadVariantAccess>(); + } + + return Access(absl::forward(self)); + } + // The implementation of the move-assignment operation for a variant. template struct MoveAssignVisitor { @@ -902,6 +912,11 @@ struct PerformVisitation { template constexpr ReturnType Run(std::false_type /*has_valueless*/, index_sequence, SizeT...) const { + static_assert( + std::is_same...)>>::value, + "All visitation overloads must have the same return type."); return absl::base_internal::Invoke( absl::forward(op), VariantCoreAccess::Access( @@ -1056,32 +1071,6 @@ struct OverloadSet<> { static void Overload(...); }; -//////////////////////////////// -// Library Fundamentals V2 TS // -//////////////////////////////// - -// TODO(calabrese): Consider moving this to absl/meta/type_traits.h - -// The following is a rough implementation of parts of the detection idiom. -// It is used for the comparison operator checks. - -template class Op, class... Args> -struct is_detected_convertible_impl { - using type = std::false_type; -}; - -template class Op, class... Args> -struct is_detected_convertible_impl< - absl::enable_if_t, To>::value>, To, Op, - Args...> { - using type = std::true_type; -}; - -// NOTE: This differs from library fundamentals by being lazy. -template class Op, class... Args> -struct is_detected_convertible - : is_detected_convertible_impl::type {}; - template using LessThanResult = decltype(std::declval() < std::declval()); @@ -1101,6 +1090,8 @@ using EqualResult = decltype(std::declval() == std::declval()); template using NotEqualResult = decltype(std::declval() != std::declval()); +using type_traits_internal::is_detected_convertible; + template using RequireAllHaveEqualT = absl::enable_if_t< absl::conjunction...>::value, @@ -1245,23 +1236,29 @@ using VariantCopyBase = absl::conditional_t< // Base that is dependent on whether or not the move-assign can be trivial. template using VariantMoveAssignBase = absl::conditional_t< - absl::disjunction>, - std::is_move_constructible>, - std::is_destructible>>, - absl::negation..., - std::is_move_assignable...>>>::value, + absl::disjunction< + absl::conjunction>, + std::is_move_constructible>, + std::is_destructible>>, + absl::negation..., + // Note: We're not qualifying this with + // absl:: because it doesn't compile + // under MSVC. + is_move_assignable...>>>::value, VariantCopyBase, VariantMoveAssignBaseNontrivial>; // Base that is dependent on whether or not the copy-assign can be trivial. template using VariantCopyAssignBase = absl::conditional_t< - absl::disjunction>, - std::is_copy_constructible>, - std::is_destructible>>, - absl::negation..., - std::is_copy_assignable...>>>::value, + absl::disjunction< + absl::conjunction>, + std::is_copy_constructible>, + std::is_destructible>>, + absl::negation..., + // Note: We're not qualifying this with + // absl:: because it doesn't compile + // under MSVC. + is_copy_assignable...>>>::value, VariantMoveAssignBase, VariantCopyAssignBaseNontrivial>; template @@ -1628,7 +1625,8 @@ struct VariantHashBase