# StatusCode.msg

## Overview

`StatusCode.msg` defines status code constants equivalent to the gRPC API status codes. These constants are used with `StatusResponse.msg` to report the outcome of service calls in a way that is compatible with the Cartographer gRPC interface.

## Constants

| Constant | Value | Meaning |
| --- | --- | --- |
| `OK` | `0` | The call succeeded. |
| `CANCELLED` | `1` | The call was cancelled. |
| `UNKNOWN` | `2` | An unknown error occurred. |
| `INVALID_ARGUMENT` | `3` | A client-supplied argument was invalid. |
| `DEADLINE_EXCEEDED` | `4` | The call exceeded its deadline. |
| `NOT_FOUND` | `5` | The requested entity was not found. |
| `ALREADY_EXISTS` | `6` | An entity that should not exist was found. |
| `PERMISSION_DENIED` | `7` | The caller lacks permission. |
| `RESOURCE_EXHAUSTED` | `8` | A resource quota was exceeded. |
| `FAILED_PRECONDITION` | `9` | The system was not in the required state. |
| `ABORTED` | `10` | The operation was aborted. |
| `OUT_OF_RANGE` | `11` | An argument was out of range. |
| `UNIMPLEMENTED` | `12` | The operation is not implemented. |
| `INTERNAL` | `13` | An internal error occurred. |
| `UNAVAILABLE` | `14` | The service is currently unavailable. |
| `DATA_LOSS` | `15` | Unrecoverable data loss occurred. |

## Usage

- The constants mirror the gRPC API status codes documented at the Google Maps Booking gRPC reference.
- `StatusResponse.code` holds one of these values to indicate the outcome of a service call.