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66 lines
2.9 KiB
Diff
66 lines
2.9 KiB
Diff
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diff --git a/absl/container/internal/compressed_tuple.h b/absl/container/internal/compressed_tuple.h
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index 4bfe92f..02bfd03 100644
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--- a/absl/container/internal/compressed_tuple.h
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+++ b/absl/container/internal/compressed_tuple.h
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@@ -169,9 +169,33 @@ constexpr bool ShouldAnyUseBase() {
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}
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template <typename T, typename V>
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-using TupleMoveConstructible = typename std::conditional<
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- std::is_reference<T>::value, std::is_convertible<V, T>,
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- std::is_constructible<T, V&&>>::type;
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+using TupleElementMoveConstructible =
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+ typename std::conditional<std::is_reference<T>::value,
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+ std::is_convertible<V, T>,
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+ std::is_constructible<T, V&&>>::type;
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+
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+template <bool SizeMatches, class T, class... Vs>
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+struct TupleMoveConstructible : std::false_type {};
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+
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+template <class... Ts, class... Vs>
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+struct TupleMoveConstructible<true, CompressedTuple<Ts...>, Vs...>
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+ : std::integral_constant<
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+ bool, absl::conjunction<
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+ TupleElementMoveConstructible<Ts, Vs&&>...>::value> {};
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+
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+template <typename T>
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+struct compressed_tuple_size;
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+
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+template <typename... Es>
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+struct compressed_tuple_size<CompressedTuple<Es...>>
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+ : public std::integral_constant<std::size_t, sizeof...(Es)> {};
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+
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+template <class T, class... Vs>
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+struct TupleItemsMoveConstructible
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+ : std::integral_constant<
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+ bool, TupleMoveConstructible<compressed_tuple_size<T>::value ==
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+ sizeof...(Vs),
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+ T, Vs...>::value> {};
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} // namespace internal_compressed_tuple
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@@ -217,17 +241,18 @@ class ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTuple
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explicit constexpr CompressedTuple(const Ts&... base)
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: CompressedTuple::CompressedTupleImpl(absl::in_place, base...) {}
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- template <typename... Vs,
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+ template <typename First, typename... Vs,
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absl::enable_if_t<
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absl::conjunction<
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// Ensure we are not hiding default copy/move constructors.
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absl::negation<std::is_same<void(CompressedTuple),
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- void(absl::decay_t<Vs>...)>>,
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- internal_compressed_tuple::TupleMoveConstructible<
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- Ts, Vs&&>...>::value,
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+ void(absl::decay_t<First>)>>,
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+ internal_compressed_tuple::TupleItemsMoveConstructible<
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+ CompressedTuple<Ts...>, First, Vs...>>::value,
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bool> = true>
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- explicit constexpr CompressedTuple(Vs&&... base)
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+ explicit constexpr CompressedTuple(First&& first, Vs&&... base)
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: CompressedTuple::CompressedTupleImpl(absl::in_place,
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+ absl::forward<First>(first),
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absl::forward<Vs>(base)...) {}
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template <int I>
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