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Showing content from https://cloud.google.com/cpp/docs/reference/essentialcontacts/2.29.0 below:

C++ Client Libraries | Google Cloud

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Many Google Cloud services, such as Cloud Billing, send out notifications to share important information with Google Cloud users. By default, these notifications are sent to members with certain Identity and Access Management (IAM) roles. With the Essential Contacts API, you can customize who receives notifications by providing your own list of contacts.

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/essentialcontacts/quickstart/ directory, which should give you a taste of the Essential Contacts API C++ client library API.

#include "google/cloud/essentialcontacts/v1/essential_contacts_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;
  }

  namespace essentialcontacts = ::google::cloud::essentialcontacts_v1;
  auto client = essentialcontacts::EssentialContactsServiceClient(
      essentialcontacts::MakeEssentialContactsServiceConnection());

  auto const project = google::cloud::Project(argv[1]);
  for (auto r : client.ListContacts(project.FullName())) {
    if (!r) throw std::move(r).status();
    std::cout << r->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 essentialcontacts_v1::EssentialContactsServiceClient. All RPCs are exposed as member functions of this class. Other classes provide helpers, configuration parameters, and infrastructure to mock essentialcontacts_v1::EssentialContactsServiceClient 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 Essential Contacts API C++ Client Library allows customization of who receives Google Cloud notifications beyond default IAM role recipients."],["The library is generally available (GA), but it does not follow Semantic Versioning, with version 2.37.0-rc being the latest release candidate."],["The primary class for interacting with the API is `essentialcontacts_v1::EssentialContactsServiceClient`, which exposes all Remote Procedure Calls (RPCs)."],["The library provides tools for error handling, overriding default endpoints, authentication credentials, and retry policies, all configurable via environment variables."],["A quickstart example is available, showcasing how to list contacts using the library with the essential code to get you started with this library."]]],[]]

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