diff options
Diffstat (limited to 'absl/status/statusor.h')
| -rw-r--r-- | absl/status/statusor.h | 250 |
1 files changed, 108 insertions, 142 deletions
diff --git a/absl/status/statusor.h b/absl/status/statusor.h index cd35e5b4..b1da45e6 100644 --- a/absl/status/statusor.h +++ b/absl/status/statusor.h @@ -236,57 +236,55 @@ class StatusOr : private internal_statusor::StatusOrData<T>, // is explicit if and only if the corresponding construction of `T` from `U` // is explicit. (This constructor inherits its explicitness from the // underlying constructor.) - template < - typename U, - absl::enable_if_t< - absl::conjunction< - absl::negation<std::is_same<T, U>>, - std::is_constructible<T, const U&>, - std::is_convertible<const U&, T>, - absl::negation< - internal_statusor::IsConstructibleOrConvertibleFromStatusOr< - T, U>>>::value, - int> = 0> + template <typename U, absl::enable_if_t< + internal_statusor::IsConstructionFromStatusOrValid< + false, T, U, false, const U&>::value, + int> = 0> StatusOr(const StatusOr<U>& other) // NOLINT : Base(static_cast<const typename StatusOr<U>::Base&>(other)) {} - template < - typename U, - absl::enable_if_t< - absl::conjunction< - absl::negation<std::is_same<T, U>>, - std::is_constructible<T, const U&>, - absl::negation<std::is_convertible<const U&, T>>, - absl::negation< - internal_statusor::IsConstructibleOrConvertibleFromStatusOr< - T, U>>>::value, - int> = 0> + template <typename U, absl::enable_if_t< + internal_statusor::IsConstructionFromStatusOrValid< + false, T, U, true, const U&>::value, + int> = 0> + StatusOr(const StatusOr<U>& other ABSL_ATTRIBUTE_LIFETIME_BOUND) // NOLINT + : Base(static_cast<const typename StatusOr<U>::Base&>(other)) {} + template <typename U, absl::enable_if_t< + internal_statusor::IsConstructionFromStatusOrValid< + true, T, U, false, const U&>::value, + int> = 0> explicit StatusOr(const StatusOr<U>& other) : Base(static_cast<const typename StatusOr<U>::Base&>(other)) {} + template <typename U, absl::enable_if_t< + internal_statusor::IsConstructionFromStatusOrValid< + true, T, U, true, const U&>::value, + int> = 0> + explicit StatusOr(const StatusOr<U>& other ABSL_ATTRIBUTE_LIFETIME_BOUND) + : Base(static_cast<const typename StatusOr<U>::Base&>(other)) {} - template < - typename U, - absl::enable_if_t< - absl::conjunction< - absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>, - std::is_convertible<U&&, T>, - absl::negation< - internal_statusor::IsConstructibleOrConvertibleFromStatusOr< - T, U>>>::value, - int> = 0> + template <typename U, absl::enable_if_t< + internal_statusor::IsConstructionFromStatusOrValid< + false, T, U, false, U&&>::value, + int> = 0> StatusOr(StatusOr<U>&& other) // NOLINT : Base(static_cast<typename StatusOr<U>::Base&&>(other)) {} - template < - typename U, - absl::enable_if_t< - absl::conjunction< - absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>, - absl::negation<std::is_convertible<U&&, T>>, - absl::negation< - internal_statusor::IsConstructibleOrConvertibleFromStatusOr< - T, U>>>::value, - int> = 0> + template <typename U, absl::enable_if_t< + internal_statusor::IsConstructionFromStatusOrValid< + false, T, U, true, U&&>::value, + int> = 0> + StatusOr(StatusOr<U>&& other ABSL_ATTRIBUTE_LIFETIME_BOUND) // NOLINT + : Base(static_cast<typename StatusOr<U>::Base&&>(other)) {} + template <typename U, absl::enable_if_t< + internal_statusor::IsConstructionFromStatusOrValid< + true, T, U, false, U&&>::value, + int> = 0> explicit StatusOr(StatusOr<U>&& other) : Base(static_cast<typename StatusOr<U>::Base&&>(other)) {} + template <typename U, absl::enable_if_t< + internal_statusor::IsConstructionFromStatusOrValid< + true, T, U, true, U&&>::value, + int> = 0> + explicit StatusOr(StatusOr<U>&& other ABSL_ATTRIBUTE_LIFETIME_BOUND) + : Base(static_cast<typename StatusOr<U>::Base&&>(other)) {} // Converting Assignment Operators @@ -307,37 +305,38 @@ class StatusOr : private internal_statusor::StatusOrData<T>, // These overloads only apply if `absl::StatusOr<T>` is constructible and // assignable from `absl::StatusOr<U>` and `StatusOr<T>` cannot be directly // assigned from `StatusOr<U>`. - template < - typename U, - absl::enable_if_t< - absl::conjunction< - absl::negation<std::is_same<T, U>>, - std::is_constructible<T, const U&>, - std::is_assignable<T, const U&>, - absl::negation< - internal_statusor:: - IsConstructibleOrConvertibleOrAssignableFromStatusOr< - T, U>>>::value, - int> = 0> + template <typename U, + absl::enable_if_t<internal_statusor::IsStatusOrAssignmentValid< + T, const U&, false>::value, + int> = 0> StatusOr& operator=(const StatusOr<U>& other) { this->Assign(other); return *this; } - template < - typename U, - absl::enable_if_t< - absl::conjunction< - absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>, - std::is_assignable<T, U&&>, - absl::negation< - internal_statusor:: - IsConstructibleOrConvertibleOrAssignableFromStatusOr< - T, U>>>::value, - int> = 0> + template <typename U, + absl::enable_if_t<internal_statusor::IsStatusOrAssignmentValid< + T, const U&, true>::value, + int> = 0> + StatusOr& operator=(const StatusOr<U>& other ABSL_ATTRIBUTE_LIFETIME_BOUND) { + this->Assign(other); + return *this; + } + template <typename U, + absl::enable_if_t<internal_statusor::IsStatusOrAssignmentValid< + T, U&&, false>::value, + int> = 0> StatusOr& operator=(StatusOr<U>&& other) { this->Assign(std::move(other)); return *this; } + template <typename U, + absl::enable_if_t<internal_statusor::IsStatusOrAssignmentValid< + T, U&&, true>::value, + int> = 0> + StatusOr& operator=(StatusOr<U>&& other ABSL_ATTRIBUTE_LIFETIME_BOUND) { + this->Assign(std::move(other)); + return *this; + } // Constructs a new `absl::StatusOr<T>` with a non-ok status. After calling // this constructor, `this->ok()` will be `false` and calls to `value()` will @@ -350,46 +349,21 @@ class StatusOr : private internal_statusor::StatusOrData<T>, // REQUIRES: !Status(std::forward<U>(v)).ok(). This requirement is DCHECKed. // In optimized builds, passing absl::OkStatus() here will have the effect // of passing absl::StatusCode::kInternal as a fallback. - template < - typename U = absl::Status, - absl::enable_if_t< - absl::conjunction< - std::is_convertible<U&&, absl::Status>, - std::is_constructible<absl::Status, U&&>, - absl::negation<std::is_same<absl::decay_t<U>, absl::StatusOr<T>>>, - absl::negation<std::is_same<absl::decay_t<U>, T>>, - absl::negation<std::is_same<absl::decay_t<U>, absl::in_place_t>>, - absl::negation<internal_statusor::HasConversionOperatorToStatusOr< - T, U&&>>>::value, - int> = 0> + template <typename U = absl::Status, + absl::enable_if_t<internal_statusor::IsConstructionFromStatusValid< + false, T, U>::value, + int> = 0> StatusOr(U&& v) : Base(std::forward<U>(v)) {} - template < - typename U = absl::Status, - absl::enable_if_t< - absl::conjunction< - absl::negation<std::is_convertible<U&&, absl::Status>>, - std::is_constructible<absl::Status, U&&>, - absl::negation<std::is_same<absl::decay_t<U>, absl::StatusOr<T>>>, - absl::negation<std::is_same<absl::decay_t<U>, T>>, - absl::negation<std::is_same<absl::decay_t<U>, absl::in_place_t>>, - absl::negation<internal_statusor::HasConversionOperatorToStatusOr< - T, U&&>>>::value, - int> = 0> + template <typename U = absl::Status, + absl::enable_if_t<internal_statusor::IsConstructionFromStatusValid< + true, T, U>::value, + int> = 0> explicit StatusOr(U&& v) : Base(std::forward<U>(v)) {} - - template < - typename U = absl::Status, - absl::enable_if_t< - absl::conjunction< - std::is_convertible<U&&, absl::Status>, - std::is_constructible<absl::Status, U&&>, - absl::negation<std::is_same<absl::decay_t<U>, absl::StatusOr<T>>>, - absl::negation<std::is_same<absl::decay_t<U>, T>>, - absl::negation<std::is_same<absl::decay_t<U>, absl::in_place_t>>, - absl::negation<internal_statusor::HasConversionOperatorToStatusOr< - T, U&&>>>::value, - int> = 0> + template <typename U = absl::Status, + absl::enable_if_t<internal_statusor::IsConstructionFromStatusValid< + false, T, U>::value, + int> = 0> StatusOr& operator=(U&& v) { this->AssignStatus(std::forward<U>(v)); return *this; @@ -411,21 +385,22 @@ class StatusOr : private internal_statusor::StatusOrData<T>, // StatusOr<bool> s1 = true; // s1.ok() && *s1 == true // StatusOr<bool> s2 = false; // s2.ok() && *s2 == false // s1 = s2; // ambiguous, `s1 = *s2` or `s1 = bool(s2)`? - template < - typename U = T, - typename = typename std::enable_if<absl::conjunction< - std::is_constructible<T, U&&>, std::is_assignable<T&, U&&>, - absl::disjunction< - std::is_same<absl::remove_cvref_t<U>, T>, - absl::conjunction< - absl::negation<std::is_convertible<U&&, absl::Status>>, - absl::negation<internal_statusor:: - HasConversionOperatorToStatusOr<T, U&&>>>>, - internal_statusor::IsForwardingAssignmentValid<T, U&&>>::value>::type> + template <typename U = T, + typename std::enable_if< + internal_statusor::IsAssignmentValid<T, U, false>::value, + int>::type = 0> StatusOr& operator=(U&& v) { this->Assign(std::forward<U>(v)); return *this; } + template <typename U = T, + typename std::enable_if< + internal_statusor::IsAssignmentValid<T, U, true>::value, + int>::type = 0> + StatusOr& operator=(U&& v ABSL_ATTRIBUTE_LIFETIME_BOUND) { + this->Assign(std::forward<U>(v)); + return *this; + } // Constructs the inner value `T` in-place using the provided args, using the // `T(args...)` constructor. @@ -442,40 +417,31 @@ class StatusOr : private internal_statusor::StatusOrData<T>, // This constructor is explicit if `U` is not convertible to `T`. To avoid // ambiguity, this constructor is disabled if `U` is a `StatusOr<J>`, where // `J` is convertible to `T`. - template < - typename U = T, - absl::enable_if_t< - absl::conjunction< - internal_statusor::IsDirectInitializationValid<T, U&&>, - std::is_constructible<T, U&&>, std::is_convertible<U&&, T>, - absl::disjunction< - std::is_same<absl::remove_cvref_t<U>, T>, - absl::conjunction< - absl::negation<std::is_convertible<U&&, absl::Status>>, - absl::negation< - internal_statusor::HasConversionOperatorToStatusOr< - T, U&&>>>>>::value, - int> = 0> + template <typename U = T, + absl::enable_if_t<internal_statusor::IsConstructionValid< + false, T, U, false>::value, + int> = 0> StatusOr(U&& u) // NOLINT : StatusOr(absl::in_place, std::forward<U>(u)) {} + template <typename U = T, + absl::enable_if_t<internal_statusor::IsConstructionValid< + false, T, U, true>::value, + int> = 0> + StatusOr(U&& u ABSL_ATTRIBUTE_LIFETIME_BOUND) // NOLINT + : StatusOr(absl::in_place, std::forward<U>(u)) {} - template < - typename U = T, - absl::enable_if_t< - absl::conjunction< - internal_statusor::IsDirectInitializationValid<T, U&&>, - absl::disjunction< - std::is_same<absl::remove_cvref_t<U>, T>, - absl::conjunction< - absl::negation<std::is_constructible<absl::Status, U&&>>, - absl::negation< - internal_statusor::HasConversionOperatorToStatusOr< - T, U&&>>>>, - std::is_constructible<T, U&&>, - absl::negation<std::is_convertible<U&&, T>>>::value, - int> = 0> + template <typename U = T, + absl::enable_if_t<internal_statusor::IsConstructionValid< + true, T, U, false>::value, + int> = 0> explicit StatusOr(U&& u) // NOLINT : StatusOr(absl::in_place, std::forward<U>(u)) {} + template <typename U = T, + absl::enable_if_t< + internal_statusor::IsConstructionValid<true, T, U, true>::value, + int> = 0> + explicit StatusOr(U&& u ABSL_ATTRIBUTE_LIFETIME_BOUND) // NOLINT + : StatusOr(absl::in_place, std::forward<U>(u)) {} // StatusOr<T>::ok() // |