Result of a Read operation.

Types¶

enum class State;

Specifies the interpretation of value.

Methods¶

static ReadResult Unspecified(TimestampedStorageGeneration stamp);

Constructs a read result with unspecified value and generation.

static ReadResult Missing(TimestampedStorageGeneration stamp);

static ReadResult Missing(absl::Time time);

Constructs a read result for a missing value.

static ReadResult
Value(absl::Cord value, TimestampedStorageGeneration stamp);

Constructs a read result for a value.

bool aborted() const;

Returns true if the read was aborted because the conditions were not satisfied.

bool not_found() const;

Returns true if the key was not found.

bool has_value() const;

Returns true if a value is available.

std::optional<absl::Cord> optional_value() const&;

std::optional<absl::Cord> optional_value() &&;

Returns the value, or std::nullopt if not available.

Data members¶

State state = kUnspecified;

Indicates the interpretation of value.

absl::Cord value;

Specifies the value if state == kValue. Otherwise must be empty.

TimestampedStorageGeneration stamp;

Generation and timestamp associated with value and state.

Friend functions¶

friend bool operator==(const ReadResult& a, const ReadResult& b);

friend bool operator!=(const ReadResult& a, const ReadResult& b);

Compares two read results for equality.

friend std::ostream&
operator<<(std::ostream& os, const ReadResult& x);

Prints a debugging string representation to an std::ostream.