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Showing content from https://cloud.google.com/cpp/docs/reference/oauth2/2.32.0 below:

C++ Client Libraries | Google Cloud

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This library contains helpers to create OAuth2 access tokens. This may be useful when trying to access customer services deployed to Cloud Run, or when using Google APIs that lack a client library in google-cloud-cpp.

The following shows the code that you'll run in the google/cloud/oauth2/quickstart/ directory. This is the typical usage of the library in applications.

#include "google/cloud/oauth2/access_token_generator.h"
#include <iostream>

int main(int argc, char* argv[]) try {
  if (argc != 1) {
    std::cerr << "Usage: " << argv[0] << "\n";
    return 1;
  }

  // Use Application Default Credentials to initialize an AccessTokenGenerator
  // retrieve the access token.
  auto credentials = google::cloud::MakeGoogleDefaultCredentials();
  auto generator =
      google::cloud::oauth2::MakeAccessTokenGenerator(*credentials);
  auto token = generator->GetToken();
  if (!token) throw std::move(token).status();
  // Only print the first few characters to avoid leaking tokens in test logs.
  std::cout << "The access token starts with " << token->token.substr(0, 16)
            << "\n";

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

• oauth2::AccessTokenGenerator
• oauth2::MakeAccessTokenGenerator()

• Error Handling - describes how the library reports errors.
• Authentication methods at Google - has more information about authentication and the Application Default credentials

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 provides documentation for the OAuth2 Access Token Generation Library, useful for accessing Cloud Run services or Google APIs without a dedicated client library in `google-cloud-cpp`."],["The library's primary function is creating OAuth2 access tokens, and it utilizes Application Default Credentials for initialization and token retrieval."],["The most current version of the library is 2.37.0-rc, with several previous versions available, dating back to version 2.16.0."],["The main interfaces for the library are `oauth2::AccessTokenGenerator` and `oauth2::MakeAccessTokenGenerator()`."],["The webpage also provides links for more information on error handling and Google authentication methods, helping users to get a better understanding of the library and any necessary context."]]],[]]

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