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Diffstat (limited to 'third_party/abseil_cpp/absl/status/statusor.h')
| -rw-r--r-- | third_party/abseil_cpp/absl/status/statusor.h | 760 |
1 files changed, 0 insertions, 760 deletions
diff --git a/third_party/abseil_cpp/absl/status/statusor.h b/third_party/abseil_cpp/absl/status/statusor.h deleted file mode 100644 index 469d486fdd2e..000000000000 --- a/third_party/abseil_cpp/absl/status/statusor.h +++ /dev/null @@ -1,760 +0,0 @@ -// Copyright 2020 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// ----------------------------------------------------------------------------- -// File: statusor.h -// ----------------------------------------------------------------------------- -// -// An `absl::StatusOr<T>` represents a union of an `absl::Status` object -// and an object of type `T`. The `absl::StatusOr<T>` will either contain an -// object of type `T` (indicating a successful operation), or an error (of type -// `absl::Status`) explaining why such a value is not present. -// -// In general, check the success of an operation returning an -// `absl::StatusOr<T>` like you would an `absl::Status` by using the `ok()` -// member function. -// -// Example: -// -// StatusOr<Foo> result = Calculation(); -// if (result.ok()) { -// result->DoSomethingCool(); -// } else { -// LOG(ERROR) << result.status(); -// } -#ifndef ABSL_STATUS_STATUSOR_H_ -#define ABSL_STATUS_STATUSOR_H_ - -#include <exception> -#include <initializer_list> -#include <new> -#include <string> -#include <type_traits> -#include <utility> - -#include "absl/base/attributes.h" -#include "absl/meta/type_traits.h" -#include "absl/status/internal/statusor_internal.h" -#include "absl/status/status.h" -#include "absl/types/variant.h" -#include "absl/utility/utility.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// BadStatusOrAccess -// -// This class defines the type of object to throw (if exceptions are enabled), -// when accessing the value of an `absl::StatusOr<T>` object that does not -// contain a value. This behavior is analogous to that of -// `std::bad_optional_access` in the case of accessing an invalid -// `std::optional` value. -// -// Example: -// -// try { -// absl::StatusOr<int> v = FetchInt(); -// DoWork(v.value()); // Accessing value() when not "OK" may throw -// } catch (absl::BadStatusOrAccess& ex) { -// LOG(ERROR) << ex.status(); -// } -class BadStatusOrAccess : public std::exception { - public: - explicit BadStatusOrAccess(absl::Status status); - ~BadStatusOrAccess() override; - - // BadStatusOrAccess::what() - // - // Returns the associated explanatory string of the `absl::StatusOr<T>` - // object's error code. This function only returns the string literal "Bad - // StatusOr Access" for cases when evaluating general exceptions. - // - // The pointer of this string is guaranteed to be valid until any non-const - // function is invoked on the exception object. - const char* what() const noexcept override; - - // BadStatusOrAccess::status() - // - // Returns the associated `absl::Status` of the `absl::StatusOr<T>` object's - // error. - const absl::Status& status() const; - - private: - absl::Status status_; -}; - -// Returned StatusOr objects may not be ignored. -template <typename T> -class ABSL_MUST_USE_RESULT StatusOr; - -// absl::StatusOr<T> -// -// The `absl::StatusOr<T>` class template is a union of an `absl::Status` object -// and an object of type `T`. The `absl::StatusOr<T>` models an object that is -// either a usable object, or an error (of type `absl::Status`) explaining why -// such an object is not present. An `absl::StatusOr<T>` is typically the return -// value of a function which may fail. -// -// An `absl::StatusOr<T>` can never hold an "OK" status (an -// `absl::StatusCode::kOk` value); instead, the presence of an object of type -// `T` indicates success. Instead of checking for a `kOk` value, use the -// `absl::StatusOr<T>::ok()` member function. (It is for this reason, and code -// readability, that using the `ok()` function is preferred for `absl::Status` -// as well.) -// -// Example: -// -// StatusOr<Foo> result = DoBigCalculationThatCouldFail(); -// if (result.ok()) { -// result->DoSomethingCool(); -// } else { -// LOG(ERROR) << result.status(); -// } -// -// Accessing the object held by an `absl::StatusOr<T>` should be performed via -// `operator*` or `operator->`, after a call to `ok()` confirms that the -// `absl::StatusOr<T>` holds an object of type `T`: -// -// Example: -// -// absl::StatusOr<int> i = GetCount(); -// if (i.ok()) { -// updated_total += *i -// } -// -// NOTE: using `absl::StatusOr<T>::value()` when no valid value is present will -// throw an exception if exceptions are enabled or terminate the process when -// execeptions are not enabled. -// -// Example: -// -// StatusOr<Foo> result = DoBigCalculationThatCouldFail(); -// const Foo& foo = result.value(); // Crash/exception if no value present -// foo.DoSomethingCool(); -// -// A `absl::StatusOr<T*>` can be constructed from a null pointer like any other -// pointer value, and the result will be that `ok()` returns `true` and -// `value()` returns `nullptr`. Checking the value of pointer in an -// `absl::StatusOr<T>` generally requires a bit more care, to ensure both that a -// value is present and that value is not null: -// -// StatusOr<std::unique_ptr<Foo>> result = FooFactory::MakeNewFoo(arg); -// if (!result.ok()) { -// LOG(ERROR) << result.status(); -// } else if (*result == nullptr) { -// LOG(ERROR) << "Unexpected null pointer"; -// } else { -// (*result)->DoSomethingCool(); -// } -// -// Example factory implementation returning StatusOr<T>: -// -// StatusOr<Foo> FooFactory::MakeFoo(int arg) { -// if (arg <= 0) { -// return absl::Status(absl::StatusCode::kInvalidArgument, -// "Arg must be positive"); -// } -// return Foo(arg); -// } -template <typename T> -class StatusOr : private internal_statusor::StatusOrData<T>, - private internal_statusor::CopyCtorBase<T>, - private internal_statusor::MoveCtorBase<T>, - private internal_statusor::CopyAssignBase<T>, - private internal_statusor::MoveAssignBase<T> { - template <typename U> - friend class StatusOr; - - typedef internal_statusor::StatusOrData<T> Base; - - public: - // StatusOr<T>::value_type - // - // This instance data provides a generic `value_type` member for use within - // generic programming. This usage is analogous to that of - // `optional::value_type` in the case of `std::optional`. - typedef T value_type; - - // Constructors - - // Constructs a new `absl::StatusOr` with an `absl::StatusCode::kUnknown` - // status. This constructor is marked 'explicit' to prevent usages in return - // values such as 'return {};', under the misconception that - // `absl::StatusOr<std::vector<int>>` will be initialized with an empty - // vector, instead of an `absl::StatusCode::kUnknown` error code. - explicit StatusOr(); - - // `StatusOr<T>` is copy constructible if `T` is copy constructible. - StatusOr(const StatusOr&) = default; - // `StatusOr<T>` is copy assignable if `T` is copy constructible and copy - // assignable. - StatusOr& operator=(const StatusOr&) = default; - - // `StatusOr<T>` is move constructible if `T` is move constructible. - StatusOr(StatusOr&&) = default; - // `StatusOr<T>` is moveAssignable if `T` is move constructible and move - // assignable. - StatusOr& operator=(StatusOr&&) = default; - - // Converting Constructors - - // Constructs a new `absl::StatusOr<T>` from an `absl::StatusOr<U>`, when `T` - // is constructible from `U`. To avoid ambiguity, these constructors are - // disabled if `T` is also constructible from `StatusOr<U>.`. This constructor - // 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> - 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> - explicit StatusOr(const StatusOr<U>& other) - : 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> - 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> - explicit StatusOr(StatusOr<U>&& other) - : Base(static_cast<typename StatusOr<U>::Base&&>(other)) {} - - // Converting Assignment Operators - - // Creates an `absl::StatusOr<T>` through assignment from an - // `absl::StatusOr<U>` when: - // - // * Both `absl::StatusOr<T>` and `absl::StatusOr<U>` are OK by assigning - // `U` to `T` directly. - // * `absl::StatusOr<T>` is OK and `absl::StatusOr<U>` contains an error - // code by destroying `absl::StatusOr<T>`'s value and assigning from - // `absl::StatusOr<U>' - // * `absl::StatusOr<T>` contains an error code and `absl::StatusOr<U>` is - // OK by directly initializing `T` from `U`. - // * Both `absl::StatusOr<T>` and `absl::StatusOr<U>` contain an error - // code by assigning the `Status` in `absl::StatusOr<U>` to - // `absl::StatusOr<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> - 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> - StatusOr& operator=(StatusOr<U>&& other) { - 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 - // crash, or produce an exception if exceptions are enabled. - // - // The constructor also takes any type `U` that is convertible to - // `absl::Status`. This constructor is explicit if an only if `U` is not of - // type `absl::Status` and the conversion from `U` to `Status` is explicit. - // - // 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> - 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> - 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> - StatusOr& operator=(U&& v) { - this->AssignStatus(std::forward<U>(v)); - return *this; - } - - // Perfect-forwarding value assignment operator. - - // If `*this` contains a `T` value before the call, the contained value is - // assigned from `std::forward<U>(v)`; Otherwise, it is directly-initialized - // from `std::forward<U>(v)`. - // This function does not participate in overload unless: - // 1. `std::is_constructible_v<T, U>` is true, - // 2. `std::is_assignable_v<T&, U>` is true. - // 3. `std::is_same_v<StatusOr<T>, std::remove_cvref_t<U>>` is false. - // 4. Assigning `U` to `T` is not ambiguous: - // If `U` is `StatusOr<V>` and `T` is constructible and assignable from - // both `StatusOr<V>` and `V`, the assignment is considered bug-prone and - // ambiguous thus will fail to compile. For example: - // 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_cv_t<absl::remove_reference_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> - StatusOr& operator=(U&& v) { - this->Assign(std::forward<U>(v)); - return *this; - } - - // Constructs the inner value `T` in-place using the provided args, using the - // `T(args...)` constructor. - template <typename... Args> - explicit StatusOr(absl::in_place_t, Args&&... args); - template <typename U, typename... Args> - explicit StatusOr(absl::in_place_t, std::initializer_list<U> ilist, - Args&&... args); - - // Constructs the inner value `T` in-place using the provided args, using the - // `T(U)` (direct-initialization) constructor. This constructor is only valid - // if `T` can be constructed from a `U`. Can accept move or copy constructors. - // - // This constructor is explicit if `U` is not convertible to `T`. To avoid - // ambiguity, this constuctor 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_cv_t<absl::remove_reference_t<U>>, - T>, - absl::conjunction< - absl::negation<std::is_convertible<U&&, absl::Status>>, - absl::negation< - internal_statusor::HasConversionOperatorToStatusOr< - T, U&&>>>>>::value, - int> = 0> - StatusOr(U&& u) // 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_cv_t<absl::remove_reference_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> - explicit StatusOr(U&& u) // NOLINT - : StatusOr(absl::in_place, std::forward<U>(u)) { - } - - // StatusOr<T>::ok() - // - // Returns whether or not this `absl::StatusOr<T>` holds a `T` value. This - // member function is analagous to `absl::Status::ok()` and should be used - // similarly to check the status of return values. - // - // Example: - // - // StatusOr<Foo> result = DoBigCalculationThatCouldFail(); - // if (result.ok()) { - // // Handle result - // else { - // // Handle error - // } - ABSL_MUST_USE_RESULT bool ok() const { return this->status_.ok(); } - - // StatusOr<T>::status() - // - // Returns a reference to the current `absl::Status` contained within the - // `absl::StatusOr<T>`. If `absl::StatusOr<T>` contains a `T`, then this - // function returns `absl::OkStatus()`. - const Status& status() const &; - Status status() &&; - - // StatusOr<T>::value() - // - // Returns a reference to the held value if `this->ok()`. Otherwise, throws - // `absl::BadStatusOrAccess` if exceptions are enabled, or is guaranteed to - // terminate the process if exceptions are disabled. - // - // If you have already checked the status using `this->ok()`, you probably - // want to use `operator*()` or `operator->()` to access the value instead of - // `value`. - // - // Note: for value types that are cheap to copy, prefer simple code: - // - // T value = statusor.value(); - // - // Otherwise, if the value type is expensive to copy, but can be left - // in the StatusOr, simply assign to a reference: - // - // T& value = statusor.value(); // or `const T&` - // - // Otherwise, if the value type supports an efficient move, it can be - // used as follows: - // - // T value = std::move(statusor).value(); - // - // The `std::move` on statusor instead of on the whole expression enables - // warnings about possible uses of the statusor object after the move. - const T& value() const&; - T& value() &; - const T&& value() const&&; - T&& value() &&; - - // StatusOr<T>:: operator*() - // - // Returns a reference to the current value. - // - // REQUIRES: `this->ok() == true`, otherwise the behavior is undefined. - // - // Use `this->ok()` to verify that there is a current value within the - // `absl::StatusOr<T>`. Alternatively, see the `value()` member function for a - // similar API that guarantees crashing or throwing an exception if there is - // no current value. - const T& operator*() const&; - T& operator*() &; - const T&& operator*() const&&; - T&& operator*() &&; - - // StatusOr<T>::operator->() - // - // Returns a pointer to the current value. - // - // REQUIRES: `this->ok() == true`, otherwise the behavior is undefined. - // - // Use `this->ok()` to verify that there is a current value. - const T* operator->() const; - T* operator->(); - - // StatusOr<T>::value_or() - // - // Returns the current value if `this->ok() == true`. Otherwise constructs a - // value using the provided `default_value`. - // - // Unlike `value`, this function returns by value, copying the current value - // if necessary. If the value type supports an efficient move, it can be used - // as follows: - // - // T value = std::move(statusor).value_or(def); - // - // Unlike with `value`, calling `std::move()` on the result of `value_or` will - // still trigger a copy. - template <typename U> - T value_or(U&& default_value) const&; - template <typename U> - T value_or(U&& default_value) &&; - - // StatusOr<T>::IgnoreError() - // - // Ignores any errors. This method does nothing except potentially suppress - // complaints from any tools that are checking that errors are not dropped on - // the floor. - void IgnoreError() const; - - // StatusOr<T>::emplace() - // - // Reconstructs the inner value T in-place using the provided args, using the - // T(args...) constructor. Returns reference to the reconstructed `T`. - template <typename... Args> - T& emplace(Args&&... args) { - if (ok()) { - this->Clear(); - this->MakeValue(std::forward<Args>(args)...); - } else { - this->MakeValue(std::forward<Args>(args)...); - this->status_ = absl::OkStatus(); - } - return this->data_; - } - - template < - typename U, typename... Args, - absl::enable_if_t< - std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value, - int> = 0> - T& emplace(std::initializer_list<U> ilist, Args&&... args) { - if (ok()) { - this->Clear(); - this->MakeValue(ilist, std::forward<Args>(args)...); - } else { - this->MakeValue(ilist, std::forward<Args>(args)...); - this->status_ = absl::OkStatus(); - } - return this->data_; - } - - private: - using internal_statusor::StatusOrData<T>::Assign; - template <typename U> - void Assign(const absl::StatusOr<U>& other); - template <typename U> - void Assign(absl::StatusOr<U>&& other); -}; - -// operator==() -// -// This operator checks the equality of two `absl::StatusOr<T>` objects. -template <typename T> -bool operator==(const StatusOr<T>& lhs, const StatusOr<T>& rhs) { - if (lhs.ok() && rhs.ok()) return *lhs == *rhs; - return lhs.status() == rhs.status(); -} - -// operator!=() -// -// This operator checks the inequality of two `absl::StatusOr<T>` objects. -template <typename T> -bool operator!=(const StatusOr<T>& lhs, const StatusOr<T>& rhs) { - return !(lhs == rhs); -} - -//------------------------------------------------------------------------------ -// Implementation details for StatusOr<T> -//------------------------------------------------------------------------------ - -// TODO(sbenza): avoid the string here completely. -template <typename T> -StatusOr<T>::StatusOr() : Base(Status(absl::StatusCode::kUnknown, "")) {} - -template <typename T> -template <typename U> -inline void StatusOr<T>::Assign(const StatusOr<U>& other) { - if (other.ok()) { - this->Assign(*other); - } else { - this->AssignStatus(other.status()); - } -} - -template <typename T> -template <typename U> -inline void StatusOr<T>::Assign(StatusOr<U>&& other) { - if (other.ok()) { - this->Assign(*std::move(other)); - } else { - this->AssignStatus(std::move(other).status()); - } -} -template <typename T> -template <typename... Args> -StatusOr<T>::StatusOr(absl::in_place_t, Args&&... args) - : Base(absl::in_place, std::forward<Args>(args)...) {} - -template <typename T> -template <typename U, typename... Args> -StatusOr<T>::StatusOr(absl::in_place_t, std::initializer_list<U> ilist, - Args&&... args) - : Base(absl::in_place, ilist, std::forward<Args>(args)...) {} - -template <typename T> -const Status& StatusOr<T>::status() const & { return this->status_; } -template <typename T> -Status StatusOr<T>::status() && { - return ok() ? OkStatus() : std::move(this->status_); -} - -template <typename T> -const T& StatusOr<T>::value() const& { - if (!this->ok()) internal_statusor::ThrowBadStatusOrAccess(this->status_); - return this->data_; -} - -template <typename T> -T& StatusOr<T>::value() & { - if (!this->ok()) internal_statusor::ThrowBadStatusOrAccess(this->status_); - return this->data_; -} - -template <typename T> -const T&& StatusOr<T>::value() const&& { - if (!this->ok()) { - internal_statusor::ThrowBadStatusOrAccess(std::move(this->status_)); - } - return std::move(this->data_); -} - -template <typename T> -T&& StatusOr<T>::value() && { - if (!this->ok()) { - internal_statusor::ThrowBadStatusOrAccess(std::move(this->status_)); - } - return std::move(this->data_); -} - -template <typename T> -const T& StatusOr<T>::operator*() const& { - this->EnsureOk(); - return this->data_; -} - -template <typename T> -T& StatusOr<T>::operator*() & { - this->EnsureOk(); - return this->data_; -} - -template <typename T> -const T&& StatusOr<T>::operator*() const&& { - this->EnsureOk(); - return std::move(this->data_); -} - -template <typename T> -T&& StatusOr<T>::operator*() && { - this->EnsureOk(); - return std::move(this->data_); -} - -template <typename T> -const T* StatusOr<T>::operator->() const { - this->EnsureOk(); - return &this->data_; -} - -template <typename T> -T* StatusOr<T>::operator->() { - this->EnsureOk(); - return &this->data_; -} - -template <typename T> -template <typename U> -T StatusOr<T>::value_or(U&& default_value) const& { - if (ok()) { - return this->data_; - } - return std::forward<U>(default_value); -} - -template <typename T> -template <typename U> -T StatusOr<T>::value_or(U&& default_value) && { - if (ok()) { - return std::move(this->data_); - } - return std::forward<U>(default_value); -} - -template <typename T> -void StatusOr<T>::IgnoreError() const { - // no-op -} - -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_STATUS_STATUSOR_H_ |