Source code
Revision control
Copy as Markdown
Other Tools
// Copyright 2019 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
//
//
// 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.
#ifndef ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_
#define ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_
#include <atomic>
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/container/inlined_vector.h"
#include "absl/strings/cord.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#ifndef SWIG
// Disabled for SWIG as it doesn't parse attributes correctly.
namespace absl {
ABSL_NAMESPACE_BEGIN
// Returned Status objects may not be ignored. Codesearch doesn't handle ifdefs
// as part of a class definitions (b/6995610), so we use a forward declaration.
//
// TODO(b/176172494): ABSL_MUST_USE_RESULT should expand to the more strict
// [[nodiscard]]. For now, just use [[nodiscard]] directly when it is available.
#if ABSL_HAVE_CPP_ATTRIBUTE(nodiscard)
class [[nodiscard]] Status;
#else
class ABSL_MUST_USE_RESULT Status;
#endif
ABSL_NAMESPACE_END
} // namespace absl
#endif // !SWIG
namespace absl {
ABSL_NAMESPACE_BEGIN
enum class StatusCode : int;
enum class StatusToStringMode : int;
namespace status_internal {
// Container for status payloads.
struct Payload {
std::string type_url;
absl::Cord payload;
};
using Payloads = absl::InlinedVector<Payload, 1>;
// Reference-counted representation of Status data.
class StatusRep {
public:
StatusRep(absl::StatusCode code_arg, absl::string_view message_arg,
std::unique_ptr<status_internal::Payloads> payloads_arg)
: ref_(int32_t{1}),
code_(code_arg),
message_(message_arg),
payloads_(std::move(payloads_arg)) {}
absl::StatusCode code() const { return code_; }
const std::string& message() const { return message_; }
// Ref and unref are const to allow access through a const pointer, and are
// used during copying operations.
void Ref() const { ref_.fetch_add(1, std::memory_order_relaxed); }
void Unref() const;
// Payload methods correspond to the same methods in absl::Status.
absl::optional<absl::Cord> GetPayload(absl::string_view type_url) const;
void SetPayload(absl::string_view type_url, absl::Cord payload);
struct EraseResult {
bool erased;
uintptr_t new_rep;
};
EraseResult ErasePayload(absl::string_view type_url);
void ForEachPayload(
absl::FunctionRef<void(absl::string_view, const absl::Cord&)> visitor)
const;
std::string ToString(StatusToStringMode mode) const;
bool operator==(const StatusRep& other) const;
bool operator!=(const StatusRep& other) const { return !(*this == other); }
// Returns an equivalent heap allocated StatusRep with refcount 1.
//
// `this` is not safe to be used after calling as it may have been deleted.
StatusRep* CloneAndUnref() const;
private:
mutable std::atomic<int32_t> ref_;
absl::StatusCode code_;
// As an internal implementation detail, we guarantee that if status.message()
// is non-empty, then the resulting string_view is null terminated.
// This is required to implement 'StatusMessageAsCStr(...)'
std::string message_;
std::unique_ptr<status_internal::Payloads> payloads_;
};
absl::StatusCode MapToLocalCode(int value);
// Returns a pointer to a newly-allocated string with the given `prefix`,
// suitable for output as an error message in assertion/`CHECK()` failures.
//
// This is an internal implementation detail for Abseil logging.
std::string* MakeCheckFailString(const absl::Status* status,
const char* prefix);
} // namespace status_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_