StatusOr returns a value on success and a Status on error.
future and promise futures (a holder that will receive a value asynchronously) and promises (the counterpart of a future, where values are stored asynchronously). They satisfy the API for std::future and std::promise, and add support for callbacks and cancellation.
More information
Error Handling for more details about how the libraries report run-time errors and how you can handle them.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page details common components shared across Google Cloud C++ Client Libraries, including credentials, options, status, StatusOr, future, and promise.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release candidate version available is 2.37.0-rc, and the page lists versions from 2.10.1 up to 2.36.0 for reference.\u003c/p\u003e\n"],["\u003cp\u003eIt is strongly recommended not to use any symbols from namespaces containing "internal" or "testing," such as \u003ccode\u003egoogle::cloud::internal\u003c/code\u003e and \u003ccode\u003egoogle::cloud::testing_util\u003c/code\u003e, as they are subject to change without notice.\u003c/p\u003e\n"],["\u003cp\u003eThe page provides additional information on error handling, client library configuration, authentication, and logging within the context of these C++ libraries.\u003c/p\u003e\n"]]],[],null,["Version 2.12.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/common/latest)\n- [2.41.0](/cpp/docs/reference/common/2.41.0)\n- [2.40.0](/cpp/docs/reference/common/2.40.0)\n- [2.39.0](/cpp/docs/reference/common/2.39.0)\n- [2.38.0](/cpp/docs/reference/common/2.38.0)\n- [2.37.0](/cpp/docs/reference/common/2.37.0)\n- [2.36.0](/cpp/docs/reference/common/2.36.0)\n- [2.35.0](/cpp/docs/reference/common/2.35.0)\n- [2.34.0](/cpp/docs/reference/common/2.34.0)\n- [2.33.0](/cpp/docs/reference/common/2.33.0)\n- [2.32.0](/cpp/docs/reference/common/2.32.0)\n- [2.31.0](/cpp/docs/reference/common/2.31.0)\n- [2.30.0](/cpp/docs/reference/common/2.30.0)\n- [2.29.0](/cpp/docs/reference/common/2.29.0)\n- [2.28.0](/cpp/docs/reference/common/2.28.0)\n- [2.27.0](/cpp/docs/reference/common/2.27.0)\n- [2.26.0](/cpp/docs/reference/common/2.26.0)\n- [2.25.1](/cpp/docs/reference/common/2.25.1)\n- [2.24.0](/cpp/docs/reference/common/2.24.0)\n- [2.23.0](/cpp/docs/reference/common/2.23.0)\n- [2.22.1](/cpp/docs/reference/common/2.22.1)\n- [2.21.0](/cpp/docs/reference/common/2.21.0)\n- [2.20.0](/cpp/docs/reference/common/2.20.0)\n- [2.19.0](/cpp/docs/reference/common/2.19.0)\n- [2.18.0](/cpp/docs/reference/common/2.18.0)\n- [2.17.0](/cpp/docs/reference/common/2.17.0)\n- [2.16.0](/cpp/docs/reference/common/2.16.0)\n- [2.15.1](/cpp/docs/reference/common/2.15.1)\n- [2.14.0](/cpp/docs/reference/common/2.14.0)\n- [2.13.0](/cpp/docs/reference/common/2.13.0)\n- [2.12.0](/cpp/docs/reference/common/2.12.0)\n- [2.11.0](/cpp/docs/reference/common/2.11.0)\n- [2.10.1](/cpp/docs/reference/common/2.10.1) \n\nCommon Components for the Google Cloud C++ Client Libraries\n===========================================================\n\nOverview\n--------\n\nThis library contains common components shared by all the Google Cloud C++ Client Libraries. Including:\n\n- [Credentials](/cpp/docs/reference/common/2.12.0/classgoogle_1_1cloud_1_1Credentials) are used to configure authentication in the client libraries. See [Authentication Components](/cpp/docs/reference/common/2.12.0/group__guac) for more details on authentication.\n- [Options](/cpp/docs/reference/common/2.12.0/classgoogle_1_1cloud_1_1Options) are used to override the client library default configuration. See [Client Library Configuration](/cpp/docs/reference/common/2.12.0/group__options) for more details on library configuration.\n- [Status](/cpp/docs/reference/common/2.12.0/classgoogle_1_1cloud_1_1Status) error codes and details from an operation.\n- [StatusOr](/cpp/docs/reference/common/2.12.0/classgoogle_1_1cloud_1_1StatusOr) returns a value on success and a `Status` on error.\n- [future](/cpp/docs/reference/common/2.12.0/classgoogle_1_1cloud_1_1future) and [promise](/cpp/docs/reference/common/2.12.0/classgoogle_1_1cloud_1_1promise) futures (a holder that will receive a value asynchronously) and promises (the counterpart of a future, where values are stored asynchronously). They satisfy the API for `std::future` and `std::promise`, and add support for callbacks and cancellation.\n\n| **Warning:** Some namespaces are reserved for implementation details and are subject to change without notice. Do not use any symbols in these namespaces as your application may break when trying to use future versions of the library. These namespaces include: - Any namespace with `internal` in its name, including `google::cloud::internal` and `google::cloud::rest_internal`. - Any namespace with `testing` in its name, including `google::cloud::testing_util`.\n\n### More information\n\n- [Error Handling](/cpp/docs/reference/common/2.12.0/common-error-handling) for more details about how the libraries report run-time errors and how you can handle them.\n- [Client Library Configuration](/cpp/docs/reference/common/2.12.0/group__options) for information about configuring the client libraries at runtime.\n- [Authentication Components](/cpp/docs/reference/common/2.12.0/group__guac) for more details about how to configure authentication in the client libraries.\n- [Logging Components](/cpp/docs/reference/common/2.12.0/logging) for information about enabling logging to the console in the client libraries."]]
