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C++ Client Libraries | Google Cloud

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An idiomatic C++ client library for the Policy Simulator API

Policy Simulator is a collection of endpoints for creating, running, and viewing a Replay. A Replay is a type of simulation that lets you see how your members' access to resources might change if you changed your IAM policy.

During a Replay, Policy Simulator re-evaluates, or replays, past access attempts under both the current policy and your proposed policy, and compares those results to determine how your members' access might change under the proposed policy.

While this library is GA, please note that the Google Cloud C++ client libraries do not follow Semantic Versioning.

The following shows the code that you'll run in the google/cloud/policysimulator/quickstart/ directory, which should give you a taste of the Policy Simulator API C++ client library API.

#include "google/cloud/policysimulator/v1/simulator_client.h"
#include "google/cloud/location.h"
#include <iostream>
#include <string>

int main(int argc, char* argv[]) try {
  if (argc != 3) {
    std::cerr
        << "Usage: " << argv[0] << " project-id resource-name\n"
        << "See https://cloud.google.com/iam/docs/full-resource-names for "
           "examples of fully qualified resource names.\n";
    return 1;
  }

  auto const location = google::cloud::Location(argv[1], "global");
  auto const resource_name = std::string{argv[2]};

  namespace policysimulator = ::google::cloud::policysimulator_v1;
  auto client = policysimulator::SimulatorClient(
      policysimulator::MakeSimulatorConnection());

  google::cloud::policysimulator::v1::Replay r;
  auto& overlay = *r.mutable_config()->mutable_policy_overlay();
  overlay[resource_name] = [] {
    google::iam::v1::Policy p;
    auto& binding = *p.add_bindings();
    binding.set_role("storage.buckets.get");
    binding.add_members("user@example.com");
    return p;
  }();

  auto replay = client.CreateReplay(location.FullName(), r).get();
  if (!replay) throw std::move(replay).status();
  std::cout << replay->DebugString() << "\n";

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

The main class in this library is policysimulator_v1::SimulatorClient. All RPCs are exposed as member functions of this class. Other classes provide helpers, configuration parameters, and infrastructure to mock policysimulator_v1::SimulatorClient when testing your application.

• Error Handling - describes how the library reports errors.
• How to Override the Default Endpoint - describes how to override the default endpoint.
• How to Override the Authentication Credentials - describes how to change the authentication credentials used by the library.
• Override Retry, Backoff, and Idempotency Policies - describes how to change the default retry policies.
• Environment Variables - describes environment variables that can configure the behavior of the library.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["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 2025-08-14 UTC."],[[["The Policy Simulator API C++ Client Library allows users to simulate how changes to IAM policies impact member access to resources."],["The library's latest release candidate is version 2.37.0-rc, while it also supports versions down to 2.15.1, which are all listed with their links on this page."],["The `SimulatorClient` class within the `policysimulator_v1` namespace is the main interface for interacting with the Policy Simulator API's remote procedure calls."],["The provided quickstart code example demonstrates how to create a `Replay` and modify the policy overlay using the `SimulatorClient` class."],["This library provides comprehensive documentation on error handling, endpoint overrides, authentication credentials, retry policies, and configurable environment variables for advanced customization."]]],[]]

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