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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThe Cloud IAM C++ Client Library provides tools and functions for managing Cloud IAM from C++ applications, offering a range of classes for different service interactions.\u003c/p\u003e\n"],["\u003cp\u003eThis library is generally available (GA), but it's important to note that the Google Cloud C++ client libraries do not adhere to Semantic Versioning.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release candidate for this library is version 2.37.0-rc, while the current version displayed on the page is version 2.28.0.\u003c/p\u003e\n"],["\u003cp\u003eThe library offers \u003ccode\u003e*Client\u003c/code\u003e classes like \u003ccode\u003eIAMClient\u003c/code\u003e, \u003ccode\u003eIAMCredentialsClient\u003c/code\u003e, \u003ccode\u003eIAMPolicyClient\u003c/code\u003e, and \u003ccode\u003ePoliciesClient\u003c/code\u003e, each exposing Remote Procedure Calls (RPCs) as member functions for various services.\u003c/p\u003e\n"],["\u003cp\u003eThe page provides resources on error handling, endpoint overrides, authentication credentials, retry policies, environment variables, and testing using googlemock.\u003c/p\u003e\n"]]],[],null,["Version 2.28.0keyboard_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/2.28.0/classgoogle_1_1cloud_1_1iam__admin__v1_1_1IAMClient)\n- [`iam_credentials_v1::IAMCredentialsClient`](/cpp/docs/reference/iam/2.28.0/classgoogle_1_1cloud_1_1iam__credentials__v1_1_1IAMCredentialsClient)\n- [`iam_v1::IAMPolicyClient`](/cpp/docs/reference/iam/2.28.0/classgoogle_1_1cloud_1_1iam__v1_1_1IAMPolicyClient)\n- [`iam_v2::PoliciesClient`](/cpp/docs/reference/iam/2.28.0/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/2.28.0/iam-override-endpoint) - describes how to override the default endpoint.\n- [How to Override the Authentication Credentials](/cpp/docs/reference/iam/2.28.0/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/2.28.0/iam-override-retry) - describes how to change the default retry policies.\n- [Environment Variables](/cpp/docs/reference/iam/2.28.0/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/2.28.0/iam-mock)\n- [Testing your Cloud IAM Credentials application with googlemock](/cpp/docs/reference/iam/2.28.0/iam-credentials-mock)"]]