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-rw-r--r--abseil-cpp/absl/types/optional.h59
1 files changed, 32 insertions, 27 deletions
diff --git a/abseil-cpp/absl/types/optional.h b/abseil-cpp/absl/types/optional.h
index 61540cf..0a8080d 100644
--- a/abseil-cpp/absl/types/optional.h
+++ b/abseil-cpp/absl/types/optional.h
@@ -130,7 +130,7 @@ class optional : private optional_internal::optional_data<T>,
// Constructs an `optional` holding an empty value, NOT a default constructed
// `T`.
- constexpr optional() noexcept {}
+ constexpr optional() noexcept = default;
// Constructs an `optional` initialized with `nullopt` to hold an empty value.
constexpr optional(nullopt_t) noexcept {} // NOLINT(runtime/explicit)
@@ -282,15 +282,16 @@ class optional : private optional_internal::optional_data<T>,
optional& operator=(optional&& src) = default;
// Value assignment operators
- template <
- typename U = T,
- typename = typename std::enable_if<absl::conjunction<
- absl::negation<
- std::is_same<optional<T>, typename std::decay<U>::type>>,
- absl::negation<
- absl::conjunction<std::is_scalar<T>,
- std::is_same<T, typename std::decay<U>::type>>>,
- std::is_constructible<T, U>, std::is_assignable<T&, U>>::value>::type>
+ template <typename U = T,
+ int&..., // Workaround an internal compiler error in GCC 5 to 10.
+ typename = typename std::enable_if<absl::conjunction<
+ absl::negation<
+ std::is_same<optional<T>, typename std::decay<U>::type> >,
+ absl::negation<absl::conjunction<
+ std::is_scalar<T>,
+ std::is_same<T, typename std::decay<U>::type> > >,
+ std::is_constructible<T, U>,
+ std::is_assignable<T&, U> >::value>::type>
optional& operator=(U&& v) {
this->assign(std::forward<U>(v));
return *this;
@@ -298,13 +299,14 @@ class optional : private optional_internal::optional_data<T>,
template <
typename U,
+ int&..., // Workaround an internal compiler error in GCC 5 to 10.
typename = typename std::enable_if<absl::conjunction<
- absl::negation<std::is_same<T, U>>,
+ absl::negation<std::is_same<T, U> >,
std::is_constructible<T, const U&>, std::is_assignable<T&, const U&>,
absl::negation<
optional_internal::
is_constructible_convertible_assignable_from_optional<
- T, U>>>::value>::type>
+ T, U> > >::value>::type>
optional& operator=(const optional<U>& rhs) {
if (rhs) {
this->assign(*rhs);
@@ -315,13 +317,14 @@ class optional : private optional_internal::optional_data<T>,
}
template <typename U,
+ int&..., // Workaround an internal compiler error in GCC 5 to 10.
typename = typename std::enable_if<absl::conjunction<
- absl::negation<std::is_same<T, U>>, std::is_constructible<T, U>,
- std::is_assignable<T&, U>,
+ absl::negation<std::is_same<T, U> >,
+ std::is_constructible<T, U>, std::is_assignable<T&, U>,
absl::negation<
optional_internal::
is_constructible_convertible_assignable_from_optional<
- T, U>>>::value>::type>
+ T, U> > >::value>::type>
optional& operator=(optional<U>&& rhs) {
if (rhs) {
this->assign(std::move(*rhs));
@@ -354,7 +357,7 @@ class optional : private optional_internal::optional_data<T>,
template <typename... Args,
typename = typename std::enable_if<
std::is_constructible<T, Args&&...>::value>::type>
- T& emplace(Args&&... args) {
+ T& emplace(Args&&... args) ABSL_ATTRIBUTE_LIFETIME_BOUND {
this->destruct();
this->construct(std::forward<Args>(args)...);
return reference();
@@ -374,7 +377,8 @@ class optional : private optional_internal::optional_data<T>,
template <typename U, typename... Args,
typename = typename std::enable_if<std::is_constructible<
T, std::initializer_list<U>&, Args&&...>::value>::type>
- T& emplace(std::initializer_list<U> il, Args&&... args) {
+ T& emplace(std::initializer_list<U> il,
+ Args&&... args) ABSL_ATTRIBUTE_LIFETIME_BOUND {
this->destruct();
this->construct(il, std::forward<Args>(args)...);
return reference();
@@ -411,11 +415,11 @@ class optional : private optional_internal::optional_data<T>,
// `optional` is empty, behavior is undefined.
//
// If you need myOpt->foo in constexpr, use (*myOpt).foo instead.
- const T* operator->() const {
+ const T* operator->() const ABSL_ATTRIBUTE_LIFETIME_BOUND {
ABSL_HARDENING_ASSERT(this->engaged_);
return std::addressof(this->data_);
}
- T* operator->() {
+ T* operator->() ABSL_ATTRIBUTE_LIFETIME_BOUND {
ABSL_HARDENING_ASSERT(this->engaged_);
return std::addressof(this->data_);
}
@@ -424,17 +428,17 @@ class optional : private optional_internal::optional_data<T>,
//
// Accesses the underlying `T` value of an `optional`. If the `optional` is
// empty, behavior is undefined.
- constexpr const T& operator*() const& {
+ constexpr const T& operator*() const& ABSL_ATTRIBUTE_LIFETIME_BOUND {
return ABSL_HARDENING_ASSERT(this->engaged_), reference();
}
- T& operator*() & {
+ T& operator*() & ABSL_ATTRIBUTE_LIFETIME_BOUND {
ABSL_HARDENING_ASSERT(this->engaged_);
return reference();
}
- constexpr const T&& operator*() const && {
+ constexpr const T&& operator*() const&& ABSL_ATTRIBUTE_LIFETIME_BOUND {
return ABSL_HARDENING_ASSERT(this->engaged_), absl::move(reference());
}
- T&& operator*() && {
+ T&& operator*() && ABSL_ATTRIBUTE_LIFETIME_BOUND {
ABSL_HARDENING_ASSERT(this->engaged_);
return std::move(reference());
}
@@ -469,23 +473,24 @@ class optional : private optional_internal::optional_data<T>,
// and lvalue/rvalue-ness of the `optional` is preserved to the view of
// the `T` sub-object. Throws `absl::bad_optional_access` when the `optional`
// is empty.
- constexpr const T& value() const & {
+ constexpr const T& value() const& ABSL_ATTRIBUTE_LIFETIME_BOUND {
return static_cast<bool>(*this)
? reference()
: (optional_internal::throw_bad_optional_access(), reference());
}
- T& value() & {
+ T& value() & ABSL_ATTRIBUTE_LIFETIME_BOUND {
return static_cast<bool>(*this)
? reference()
: (optional_internal::throw_bad_optional_access(), reference());
}
- T&& value() && { // NOLINT(build/c++11)
+ T&& value() && ABSL_ATTRIBUTE_LIFETIME_BOUND { // NOLINT(build/c++11)
return std::move(
static_cast<bool>(*this)
? reference()
: (optional_internal::throw_bad_optional_access(), reference()));
}
- constexpr const T&& value() const && { // NOLINT(build/c++11)
+ constexpr const T&& value()
+ const&& ABSL_ATTRIBUTE_LIFETIME_BOUND { // NOLINT(build/c++11)
return absl::move(
static_cast<bool>(*this)
? reference()
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-29 21:46:08 +0000