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Export of internal Abseil changes.

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ed3a3431eee9e48e6553b0320e0308d2dde6725c by Derek Mauro <dmauro@google.com>:

Project import generated by Copybara.

PiperOrigin-RevId: 258631680
GitOrigin-RevId: ed3a3431eee9e48e6553b0320e0308d2dde6725c
Change-Id: I1d7ae86a79783842092d29504605ba039c369603
This commit is contained in:
Abseil Team 2019-07-17 16:35:47 -04:00 • committed by Derek Mauro
parent 44efe96dfc
commit c6c3c1b498
32 changed files with 1168 additions and 657 deletions
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49
absl/container/internal/compressed_tuple.h
View file

@ -102,7 +102,9 @@ template <typename T, size_t I,
struct Storage {
T value;
constexpr Storage() = default;
explicit constexpr Storage(T&& v) : value(absl::forward<T>(v)) {}
template <typename V>
explicit constexpr Storage(absl::in_place_t, V&& v)
: value(absl::forward<V>(v)) {}
constexpr const T& get() const& { return value; }
T& get() & { return value; }
constexpr const T&& get() const&& { return absl::move(*this).value; }
@ -112,7 +114,11 @@ struct Storage {
template <typename T, size_t I>
struct ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC Storage<T, I, true> : T {
constexpr Storage() = default;
explicit constexpr Storage(T&& v) : T(absl::forward<T>(v)) {}
template <typename V>
explicit constexpr Storage(absl::in_place_t, V&& v)
: T(absl::forward<V>(v)) {}
constexpr const T& get() const& { return *this; }
T& get() & { return *this; }
constexpr const T&& get() const&& { return absl::move(*this); }
@ -132,8 +138,9 @@ struct ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTupleImpl<
: uses_inheritance,
Storage<Ts, std::integral_constant<size_t, I>::value>... {
constexpr CompressedTupleImpl() = default;
explicit constexpr CompressedTupleImpl(Ts&&... args)
: Storage<Ts, I>(absl::forward<Ts>(args))... {}
template <typename... Vs>
explicit constexpr CompressedTupleImpl(absl::in_place_t, Vs&&... args)
: Storage<Ts, I>(absl::in_place, absl::forward<Vs>(args))... {}
friend CompressedTuple<Ts...>;
};
@ -143,8 +150,9 @@ struct ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTupleImpl<
// We use the dummy identity function as above...
: Storage<Ts, std::integral_constant<size_t, I>::value, false>... {
constexpr CompressedTupleImpl() = default;
explicit constexpr CompressedTupleImpl(Ts&&... args)
: Storage<Ts, I, false>(absl::forward<Ts>(args))... {}
template <typename... Vs>
explicit constexpr CompressedTupleImpl(absl::in_place_t, Vs&&... args)
: Storage<Ts, I, false>(absl::in_place, absl::forward<Vs>(args))... {}
friend CompressedTuple<Ts...>;
};
@ -159,6 +167,11 @@ constexpr bool ShouldAnyUseBase() {
Or({std::integral_constant<bool, ShouldUseBase<Ts>()>()...})){};
}
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;
} // namespace internal_compressed_tuple
// Helper class to perform the Empty Base Class Optimization.
@ -192,9 +205,29 @@ class ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTuple
using StorageT = internal_compressed_tuple::Storage<ElemT<I>, I>;
public:
// There seems to be a bug in MSVC dealing in which using '=default' here will
// cause the compiler to ignore the body of other constructors. The work-
// around is to explicitly implement the default constructor.
#if defined(_MSC_VER)
constexpr CompressedTuple() : CompressedTuple::CompressedTupleImpl() {}
#else
constexpr CompressedTuple() = default;
explicit constexpr CompressedTuple(Ts... base)
: CompressedTuple::CompressedTupleImpl(absl::forward<Ts>(base)...) {}
#endif
explicit constexpr CompressedTuple(const Ts&... base)
: CompressedTuple::CompressedTupleImpl(absl::in_place, base...) {}
template <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,
bool> = true>
explicit constexpr CompressedTuple(Vs&&... base)
: CompressedTuple::CompressedTupleImpl(absl::in_place,
absl::forward<Vs>(base)...) {}
template <int I>
ElemT<I>& get() & {