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The operation was cancelled (typically by the caller).

Unknown error. An example of where this error may be returned is if a Status value received from another address space belongs to an error space that is not recognized in this address space. Also errors raised by APIs that do not return enough error information may be converted to this error.

Client specified an invalid argument. Note that this differs from FAILED_PRECONDITION. INVALID_ARGUMENT indicates arguments that are problematic regardless of the state of the system (e.g., a malformed file name).

Deadline expired before operation could complete. For operations that change the state of the system, this error may be returned even if the operation has completed successfully. For example, a successful response from a server could have been delayed long enough for the deadline to expire.

Some requested entity (e.g., file or directory) was not found.

The entity that a client attempted to create (e.g., file or directory) already exists.

The caller does not have permission to execute the specified operation. PERMISSION_DENIED must not be used for rejections caused by exhausting some resource (use RESOURCE_EXHAUSTED instead for those errors). PERMISSION_DENIED must not be used if the caller can not be identified (use UNAUTHENTICATED instead for those errors).

Some resource has been exhausted, perhaps a per-user quota, or perhaps the entire file system is out of space.

Operation was rejected because the system is not in a state required for the operation’s execution. For example, directory to be deleted may be non-empty, an rmdir operation is applied to a non-directory, etc.

A litmus test that may help a service implementor in deciding between FAILED_PRECONDITION and UNAVAILABLE: (a) If the client can retry just the failing call, it should be UNAVAILABLE. (b) If the client should retry at a higher-level (e.g., restarting a read-only session or transaction), FAILED_PRECONDITION should be returned.

The operation was aborted, typically due to a concurrency issue such as a sequencer check failure or transaction abort.

See the guidelines above for deciding between FAILED_PRECONDITION and ABORTED.

The operation was attempted past the valid range. E.g., seeking or reading past end of file.

Unlike INVALID_ARGUMENT, this error indicates a problem that may be fixed if the system state changes. For example, a 32-bit file system will generate OUT_OF_RANGE if an attempt is made to write a file that is larger than the system is capable of supporting.

OUT_OF_RANGE must not be used for errors arising from attempting to read from an empty file, or to seek past EOF.

The operation is not implemented or is not supported/enabled in this service.

Internal errors. This means that some invariants expected by the underlying system have been broken. This error code is reserved for serious errors.

The service is currently unavailable. This is most likely a transient condition, which can be corrected by retrying with a backoff.

See the guidelines above for deciding between FAILED_PRECONDITION and UNAVAILABLE.

Unrecoverable data loss or corruption.

The user is not authenticated.

Creates a new instance with the specified raw value.

If there is no value of the type that corresponds with the specified raw value, this initializer returns nil. For example:

enum PaperSize: String {
    case A4, A5, Letter, Legal
}

print(PaperSize(rawValue: "Legal"))
// Prints "Optional("PaperSize.Legal")"

print(PaperSize(rawValue: "Tabloid"))
// Prints "nil"