diff options
Diffstat (limited to 'absl/container')
| -rw-r--r-- | absl/container/internal/compressed_tuple.h | 41 |
1 files changed, 33 insertions, 8 deletions
diff --git a/absl/container/internal/compressed_tuple.h b/absl/container/internal/compressed_tuple.h index 4bfe92fd991f..02bfd03f6ce5 100644 --- a/absl/container/internal/compressed_tuple.h +++ b/absl/container/internal/compressed_tuple.h @@ -169,9 +169,33 @@ constexpr bool ShouldAnyUseBase() { } template <typename T, typename V> -using TupleMoveConstructible = typename std::conditional< - std::is_reference<T>::value, std::is_convertible<V, T>, - std::is_constructible<T, V&&>>::type; +using TupleElementMoveConstructible = + typename std::conditional<std::is_reference<T>::value, + std::is_convertible<V, T>, + std::is_constructible<T, V&&>>::type; + +template <bool SizeMatches, class T, class... Vs> +struct TupleMoveConstructible : std::false_type {}; + +template <class... Ts, class... Vs> +struct TupleMoveConstructible<true, CompressedTuple<Ts...>, Vs...> + : std::integral_constant< + bool, absl::conjunction< + TupleElementMoveConstructible<Ts, Vs&&>...>::value> {}; + +template <typename T> +struct compressed_tuple_size; + +template <typename... Es> +struct compressed_tuple_size<CompressedTuple<Es...>> + : public std::integral_constant<std::size_t, sizeof...(Es)> {}; + +template <class T, class... Vs> +struct TupleItemsMoveConstructible + : std::integral_constant< + bool, TupleMoveConstructible<compressed_tuple_size<T>::value == + sizeof...(Vs), + T, Vs...>::value> {}; } // namespace internal_compressed_tuple @@ -217,17 +241,18 @@ class ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTuple explicit constexpr CompressedTuple(const Ts&... base) : CompressedTuple::CompressedTupleImpl(absl::in_place, base...) {} - template <typename... Vs, + template <typename First, typename... Vs, absl::enable_if_t< absl::conjunction< // Ensure we are not hiding default copy/move constructors. absl::negation<std::is_same<void(CompressedTuple), - void(absl::decay_t<Vs>...)>>, - internal_compressed_tuple::TupleMoveConstructible< - Ts, Vs&&>...>::value, + void(absl::decay_t<First>)>>, + internal_compressed_tuple::TupleItemsMoveConstructible< + CompressedTuple<Ts...>, First, Vs...>>::value, bool> = true> - explicit constexpr CompressedTuple(Vs&&... base) + explicit constexpr CompressedTuple(First&& first, Vs&&... base) : CompressedTuple::CompressedTupleImpl(absl::in_place, + absl::forward<First>(first), absl::forward<Vs>(base)...) {} template <int I> |