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Showing content from https://cloud.google.com/cpp/docs/reference/essentialcontacts/2.18.0 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."],[[["This webpage details the Essential Contacts API C++ client library, which allows users to customize who receives notifications from various Google Cloud services."],["The latest version of the Essential Contacts API C++ client library is 2.37.0-rc, with a list of previous versions going back to 2.12.0 also available."],["The library is Generally Available (GA), but it does not adhere to Semantic Versioning."],["`essentialcontacts_v1::EssentialContactsServiceClient` is the primary class in this library, offering member functions for all Remote Procedure Calls (RPCs)."],["The page also provides information on error handling, endpoint overrides, authentication credential changes, retry policy customization and relevant environment variables."]]],[]]

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