Google Cloud IAM C++ Client 2.11.0
A C++ Client Library for Google Cloud IAM
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Cloud IAM C++ Client Library

The Cloud IAM C++ Client library offers types and functions to use Cloud IAM from C++ applications.

This library requires a C++14 compiler. It is supported (and tested) on multiple Linux distributions, macOS, and Windows.


The following instructions show you how to perform basic tasks in Cloud IAM using the C++ client library.

Before you begin

  1. Select or create a Google Cloud Platform (GCP) project using the manage resource page. Make a note of the project id as you will need to use it later.
  2. Make sure that billing is enabled for your project.
  3. Learn about key terms and concepts for Cloud IAM.
  4. Setup the authentication for the examples:
    • [Configure a service account][gcloud-authorizing],
    • or [login with your personal account][gcloud-authorizing]

Setting up your repo

In order to use the Cloud IAM C++ client library from your own code, you'll need to configure your build system to fetch and compile the Cloud C++ client library. The Cloud IAM C++ client library natively supports the Bazel and CMake build systems. We've created a minimal, "Hello world", quickstart repo that includes detailed instructions on how to compile the library for use in your application. You can fetch the source from GitHub as normal:

git clone
cd google-cloud-cpp/google/cloud/iam/quickstart
Example: Hello World

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";
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 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.

The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.

Next Steps