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Showing content from https://cloud.google.com/cpp/docs/reference/oauth2/2.25.1/namespacegoogle_1_1cloud_1_1oauth2 below:

C++ Client Libraries | Google Cloud

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• 2.42.0-rc (latest)
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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."],[[["The latest version of the OAuth2 reference documentation is 2.37.0-rc, with multiple previous versions available, ranging from 2.36.0 down to 2.16.0."],["This library provides tools for creating OAuth2 access tokens, useful for accessing Cloud Run services or Google APIs lacking a client library in `google-cloud-cpp`."],["The `oauth2::AccessTokenGenerator` and `oauth2::MakeAccessTokenGenerator()` are the primary interfaces for generating tokens."],["The library utilizes Application Default Credentials for initializing an `AccessTokenGenerator` and retrieving access tokens."],["Error handling and authentication methods at Google are also documented, providing additional context on the library's use and security."]]],[]]

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