The Cloud IAM C++ Client library offers types and functions to use Cloud IAM from C++ applications.
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/iam/quickstart/ directory, which should give you a taste of the Cloud IAM C++ client library API.
#include "google/cloud/iam/admin/v1/iam_client.h"
#include "google/cloud/project.h"
#include <iostream>
int main(int argc, char* argv[]) try {
if (argc != 2) {
std::cerr << "Usage: " << argv[0] << " <project-id>\n";
return 1;
}
// Create a namespace alias to make the code easier to read.
namespace iam = ::google::cloud::iam_admin_v1;
iam::IAMClient client(iam::MakeIAMConnection());
auto const project = google::cloud::Project(argv[1]);
std::cout << "Service Accounts for project: " << project.project_id() << "\n";
int count = 0;
for (auto sa : client.ListServiceAccounts(project.FullName())) {
if (!sa) throw std::move(sa).status();
std::cout << sa->name() << "\n";
++count;
}
if (count == 0) std::cout << "No Service Accounts found.\n";
return 0;
} catch (google::cloud::Status const& status) {
std::cerr << "google::cloud::Status thrown: " << status << "\n";
return 1;
}
Main classes
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"]],[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 webpage provides documentation for the Cloud IAM C++ Client Library, which enables C++ applications to interact with Cloud IAM.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release candidate is version 2.37.0-rc, with several other versions available, ranging down to version 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eThe library is in GA status, although it does not follow Semantic Versioning and includes \u003ccode\u003e*Client\u003c/code\u003e classes for the different IAM services provided.\u003c/p\u003e\n"],["\u003cp\u003eThe library offers multiple methods for the user to override default behaviors, such as endpoints, authentication credentials, and retry policies, plus there are environment variables available to configure the behavior of the library.\u003c/p\u003e\n"],["\u003cp\u003eThe webpage includes a quickstart guide and code sample demonstrating how to use the Cloud IAM C++ client library to list service accounts for a given project.\u003c/p\u003e\n"]]],[],null,["Version 2.17.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/iam/latest)\n- [2.41.0](/cpp/docs/reference/iam/2.41.0)\n- [2.40.0](/cpp/docs/reference/iam/2.40.0)\n- [2.39.0](/cpp/docs/reference/iam/2.39.0)\n- [2.38.0](/cpp/docs/reference/iam/2.38.0)\n- [2.37.0](/cpp/docs/reference/iam/2.37.0)\n- [2.36.0](/cpp/docs/reference/iam/2.36.0)\n- [2.35.0](/cpp/docs/reference/iam/2.35.0)\n- [2.34.0](/cpp/docs/reference/iam/2.34.0)\n- [2.33.0](/cpp/docs/reference/iam/2.33.0)\n- [2.32.0](/cpp/docs/reference/iam/2.32.0)\n- [2.31.0](/cpp/docs/reference/iam/2.31.0)\n- [2.30.0](/cpp/docs/reference/iam/2.30.0)\n- [2.29.0](/cpp/docs/reference/iam/2.29.0)\n- [2.28.0](/cpp/docs/reference/iam/2.28.0)\n- [2.27.0](/cpp/docs/reference/iam/2.27.0)\n- [2.26.0](/cpp/docs/reference/iam/2.26.0)\n- [2.25.1](/cpp/docs/reference/iam/2.25.1)\n- [2.24.0](/cpp/docs/reference/iam/2.24.0)\n- [2.23.0](/cpp/docs/reference/iam/2.23.0)\n- [2.22.1](/cpp/docs/reference/iam/2.22.1)\n- [2.21.0](/cpp/docs/reference/iam/2.21.0)\n- [2.20.0](/cpp/docs/reference/iam/2.20.0)\n- [2.19.0](/cpp/docs/reference/iam/2.19.0)\n- [2.18.0](/cpp/docs/reference/iam/2.18.0)\n- [2.17.0](/cpp/docs/reference/iam/2.17.0)\n- [2.16.0](/cpp/docs/reference/iam/2.16.0)\n- [2.15.1](/cpp/docs/reference/iam/2.15.1)\n- [2.14.0](/cpp/docs/reference/iam/2.14.0)\n- [2.13.0](/cpp/docs/reference/iam/2.13.0)\n- [2.12.0](/cpp/docs/reference/iam/2.12.0)\n- [2.11.0](/cpp/docs/reference/iam/2.11.0) \n\nCloud IAM C++ Client Library\n============================\n\nThe Cloud IAM C++ Client library offers types and functions to use Cloud IAM from C++ applications.\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/iam/quickstart/` directory, which should give you a taste of the Cloud IAM C++ client library API. \n\n #include \"google/cloud/iam/admin/v1/iam_client.h\"\n #include \"google/cloud/project.h\"\n #include \u003ciostream\u003e\n\n int main(int argc, char* argv[]) try {\n if (argc != 2) {\n std::cerr \u003c\u003c \"Usage: \" \u003c\u003c argv[0] \u003c\u003c \" \u003cproject-id\u003e\\n\";\n return 1;\n }\n\n // Create a namespace alias to make the code easier to read.\n namespace iam = ::google::cloud::iam_admin_v1;\n iam::IAMClient client(iam::MakeIAMConnection());\n auto const project = google::cloud::Project(argv[1]);\n std::cout \u003c\u003c \"Service Accounts for project: \" \u003c\u003c project.project_id() \u003c\u003c \"\\n\";\n int count = 0;\n for (auto sa : client.ListServiceAccounts(project.FullName())) {\n if (!sa) throw std::move(sa).status();\n std::cout \u003c\u003c sa-\u003ename() \u003c\u003c \"\\n\";\n ++count;\n }\n if (count == 0) std::cout \u003c\u003c \"No Service Accounts found.\\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- [`iam_admin_v1::IAMClient`](/cpp/docs/reference/iam/2.17.0/classgoogle_1_1cloud_1_1iam__admin__v1_1_1IAMClient)\n- [`iam_credentials_v1::IAMCredentialsClient`](/cpp/docs/reference/iam/2.17.0/classgoogle_1_1cloud_1_1iam__credentials__v1_1_1IAMCredentialsClient)\n- [`iam_v1::IAMPolicyClient`](/cpp/docs/reference/iam/2.17.0/classgoogle_1_1cloud_1_1iam__v1_1_1IAMPolicyClient)\n- [`iam_v2::PoliciesClient`](/cpp/docs/reference/iam/2.17.0/classgoogle_1_1cloud_1_1iam__v2_1_1PoliciesClient)\n\n### Next Steps\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/iam/2.17.0/iam-override-endpoint) - describes how to override the default endpoint.\n- [How to Override the Authentication Credentials](/cpp/docs/reference/iam/2.17.0/iam-override-authentication) - describes how to change the authentication credentials used by the library.\n- [Override Retry, Backoff, and Idempotency Policies](/cpp/docs/reference/iam/2.17.0/iam-override-retry) - describes how to change the default retry policies.\n- [Environment Variables](/cpp/docs/reference/iam/2.17.0/iam-env) - describes environment variables that can configure the behavior of the library.\n- [Testing your Cloud IAM application with googlemock](/cpp/docs/reference/iam/2.17.0/iam-mock)\n- [Testing your Cloud IAM Credentials application with googlemock](/cpp/docs/reference/iam/2.17.0/iam-credentials-mock)"]]