An idiomatic C++ client library for theService Directory, a platform for discovering, publishing, and connecting services, regardless of the environment.
While this library isGA, please note Google Cloud C++ client libraries donotfollowSemantic Versioning.
Quickstart
The following shows the code that you'll run in thegoogle/cloud/servicedirectory/quickstart/directory, which should give you a taste of the Service Directory API C++ client library API.
This library offers multiple*Clientclasses, which are listed below. Each one of these classes exposes all the RPCs for a gRPCserviceas member functions of the class. This library groups multiple gRPC 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*Clientclasses when testing your application.
The library automatically retries requests that fail with transient errors, and usesexponential backoffto backoff between retries. Application developers can override the default policies.
More Information
Error Handling- describes how the library reports errors.
[[["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 2025-09-04 UTC."],[[["\u003cp\u003eThis webpage provides documentation for the Service Directory API C++ client library, which facilitates service discovery, publishing, and connection across various environments.\u003c/p\u003e\n"],["\u003cp\u003eThe library's latest release candidate version is 2.37.0-rc, with numerous previous versions available, such as 2.12.0 being the lowest listed, and it offers \u003ccode\u003eLookupServiceClient\u003c/code\u003e and \u003ccode\u003eRegistrationServiceClient\u003c/code\u003e classes for interacting with the API.\u003c/p\u003e\n"],["\u003cp\u003eThe provided code demonstrates a basic quickstart example using the \u003ccode\u003eRegistrationServiceClient\u003c/code\u003e to list namespaces, requiring a project ID and location ID as command-line arguments.\u003c/p\u003e\n"],["\u003cp\u003eThe library includes automatic request retries with exponential backoff for transient errors, and allows developers to override default retry and backoff policies.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation also offers information about error handling, overriding endpoints and authentication credentials, and configuring the library's behavior using environment variables.\u003c/p\u003e\n"]]],[],null,["Version 2.12.0keyboard_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/project.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 namespace servicedirectory = ::google::cloud::servicedirectory_v1;\n auto client = servicedirectory::RegistrationServiceClient(\n servicedirectory::MakeRegistrationServiceConnection());\n\n auto const project = google::cloud::Project(argv[1]);\n auto const parent = project.FullName() + \"/locations/\" + argv[2];\n for (auto ns : client.ListNamespaces(parent)) {\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 gRPC `service` as member functions of the class. This library groups multiple gRPC 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/2.12.0/classgoogle_1_1cloud_1_1servicedirectory__v1_1_1LookupServiceClient)\n- [`servicedirectory_v1::RegistrationServiceClient`](/cpp/docs/reference/servicedirectory/2.12.0/classgoogle_1_1cloud_1_1servicedirectory__v1_1_1RegistrationServiceClient)\n\n### Retry, Backoff, and Idempotency Policies.\n\nThe library automatically retries requests that fail with transient errors, and uses [exponential backoff](https://en.wikipedia.org/wiki/Exponential_backoff) to backoff between retries. Application developers can override the default policies.\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/2.12.0/servicedirectory-override-endpoint) - describes how to override the default endpoint.\n- [How to Override the Authentication Credentials](/cpp/docs/reference/servicedirectory/2.12.0/servicedirectory-override-authentication) - describes how to change the authentication credentials used by the library.\n- [Environment Variables](/cpp/docs/reference/servicedirectory/2.12.0/servicedirectory-env) - describes environment variables that can configure the behavior of the library."]]