An idiomatic C++ client library for the Service Directory, a platform for discovering, publishing, and connecting services, regardless of the environment.
While this library is GA, please note Google Cloud C++ client libraries do not follow Semantic Versioning.
Quickstart
The following shows the code that you'll run in the google/cloud/servicedirectory/quickstart/ directory, which should give you a taste of the Service Directory API C++ client library API.
This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a service as member functions of the class. This library groups multiple services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.
The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-28 UTC."],[[["\u003cp\u003eThis webpage provides documentation for the Service Directory API C++ client library, which is used for discovering, publishing, and connecting services.\u003c/p\u003e\n"],["\u003cp\u003eThe library offers \u003ccode\u003eLookupServiceClient\u003c/code\u003e and \u003ccode\u003eRegistrationServiceClient\u003c/code\u003e classes, each with member functions for service RPCs, and it currently supports version 2.30.0.\u003c/p\u003e\n"],["\u003cp\u003eWhile the library is generally available (GA), it does not follow Semantic Versioning, and the latest release is version 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation includes a quickstart guide with example code and instructions on error handling, endpoint overrides, authentication credential changes, and environment variables.\u003c/p\u003e\n"],["\u003cp\u003eThe library can be used regardless of the service environment.\u003c/p\u003e\n"]]],[],null,["Version 2.30.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/servicedirectory/latest)\n- [2.41.0](/cpp/docs/reference/servicedirectory/2.41.0)\n- [2.40.0](/cpp/docs/reference/servicedirectory/2.40.0)\n- [2.39.0](/cpp/docs/reference/servicedirectory/2.39.0)\n- [2.38.0](/cpp/docs/reference/servicedirectory/2.38.0)\n- [2.37.0](/cpp/docs/reference/servicedirectory/2.37.0)\n- [2.36.0](/cpp/docs/reference/servicedirectory/2.36.0)\n- [2.35.0](/cpp/docs/reference/servicedirectory/2.35.0)\n- [2.34.0](/cpp/docs/reference/servicedirectory/2.34.0)\n- [2.33.0](/cpp/docs/reference/servicedirectory/2.33.0)\n- [2.32.0](/cpp/docs/reference/servicedirectory/2.32.0)\n- [2.31.0](/cpp/docs/reference/servicedirectory/2.31.0)\n- [2.30.0](/cpp/docs/reference/servicedirectory/2.30.0)\n- [2.29.0](/cpp/docs/reference/servicedirectory/2.29.0)\n- [2.28.0](/cpp/docs/reference/servicedirectory/2.28.0)\n- [2.27.0](/cpp/docs/reference/servicedirectory/2.27.0)\n- [2.26.0](/cpp/docs/reference/servicedirectory/2.26.0)\n- [2.25.1](/cpp/docs/reference/servicedirectory/2.25.1)\n- [2.24.0](/cpp/docs/reference/servicedirectory/2.24.0)\n- [2.23.0](/cpp/docs/reference/servicedirectory/2.23.0)\n- [2.22.1](/cpp/docs/reference/servicedirectory/2.22.1)\n- [2.21.0](/cpp/docs/reference/servicedirectory/2.21.0)\n- [2.20.0](/cpp/docs/reference/servicedirectory/2.20.0)\n- [2.19.0](/cpp/docs/reference/servicedirectory/2.19.0)\n- [2.18.0](/cpp/docs/reference/servicedirectory/2.18.0)\n- [2.17.0](/cpp/docs/reference/servicedirectory/2.17.0)\n- [2.16.0](/cpp/docs/reference/servicedirectory/2.16.0)\n- [2.15.1](/cpp/docs/reference/servicedirectory/2.15.1)\n- [2.14.0](/cpp/docs/reference/servicedirectory/2.14.0)\n- [2.13.0](/cpp/docs/reference/servicedirectory/2.13.0)\n- [2.12.0](/cpp/docs/reference/servicedirectory/2.12.0)\n- [2.11.0](/cpp/docs/reference/servicedirectory/2.11.0) \n\nService Directory API C++ Client Library\n========================================\n\nAn idiomatic C++ client library for the [Service Directory](https://cloud.google.com/service-directory), a platform for discovering, publishing, and connecting services, regardless of the environment.\n\nWhile this library is **GA** , please note Google Cloud C++ client libraries do **not** follow [Semantic Versioning](https://semver.org/).\n\n### Quickstart\n\nThe following shows the code that you'll run in the `google/cloud/servicedirectory/quickstart/` directory, which should give you a taste of the Service Directory API C++ client library API. \n\n #include \"google/cloud/servicedirectory/v1/registration_client.h\"\n #include \"google/cloud/location.h\"\n #include \u003ciostream\u003e\n\n int main(int argc, char* argv[]) try {\n if (argc != 3) {\n std::cerr \u003c\u003c \"Usage: \" \u003c\u003c argv[0] \u003c\u003c \" project-id location-id\\n\";\n return 1;\n }\n\n auto const location = google::cloud::Location(argv[1], argv[2]);\n\n namespace servicedirectory = ::google::cloud::servicedirectory_v1;\n auto client = servicedirectory::RegistrationServiceClient(\n servicedirectory::MakeRegistrationServiceConnection());\n\n for (auto ns : client.ListNamespaces(location.FullName())) {\n if (!ns) throw std::move(ns).status();\n std::cout \u003c\u003c ns-\u003eDebugString() \u003c\u003c \"\\n\";\n }\n\n return 0;\n } catch (google::cloud::Status const& status) {\n std::cerr \u003c\u003c \"google::cloud::Status thrown: \" \u003c\u003c status \u003c\u003c \"\\n\";\n return 1;\n }\n\n### Main classes\n\nThis library offers multiple `*Client` classes, which are listed below. Each one of these classes exposes all the RPCs for a service as member functions of the class. This library groups multiple services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.\n\nThe library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the `*Client` classes when testing your application.\n\n- [`servicedirectory_v1::LookupServiceClient`](/cpp/docs/reference/servicedirectory/2.30.0/classgoogle_1_1cloud_1_1servicedirectory__v1_1_1LookupServiceClient)\n- [`servicedirectory_v1::RegistrationServiceClient`](/cpp/docs/reference/servicedirectory/2.30.0/classgoogle_1_1cloud_1_1servicedirectory__v1_1_1RegistrationServiceClient)\n\n### More Information\n\n- [Error Handling](https://cloud.google.com/cpp/docs/reference/common/latest/common-error-handling.html) - describes how the library reports errors.\n- [How to Override the Default Endpoint](/cpp/docs/reference/servicedirectory/2.30.0/servicedirectory-override-endpoint) - describes how to override the default endpoint.\n- [How to Override the Authentication Credentials](/cpp/docs/reference/servicedirectory/2.30.0/servicedirectory-override-authentication) - describes how to change the authentication credentials used by the library.\n- [Override Retry, Backoff, and Idempotency Policies](/cpp/docs/reference/servicedirectory/2.30.0/servicedirectory-override-retry) - describes how to change the default retry policies.\n- [Environment Variables](/cpp/docs/reference/servicedirectory/2.30.0/servicedirectory-env) - describes environment variables that can configure the behavior of the library."]]