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Showing content from https://cloud.google.com/cpp/docs/reference/cloudquotas/2.31.0/cloudquotas-override-authentication below:

C++ Client Libraries | Google Cloud

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Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:

  [](std::string const& keyfile) {
    auto is = std::ifstream(keyfile);
    is.exceptions(std::ios::badbit);  // Minimal error handling in examples
    auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto options =
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            google::cloud::MakeServiceAccountCredentials(contents));
    return google::cloud::cloudquotas_v1::CloudQuotasClient(
        google::cloud::cloudquotas_v1::MakeCloudQuotasConnection(options));
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

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 page provides documentation for various versions of the Cloud Quotas C++ client library, ranging from version 2.20.0 up to the latest release candidate, 2.37.0-rc."],["The primary focus of the content is on how to override the default authentication credentials used by the client libraries, which typically rely on Application Default Credentials."],["To override default credentials, users can leverage the `UnifiedCredentialsOption` by supplying service account key file contents."],["The provided code example demonstrates loading a service account key file to create a `CloudQuotasClient` with custom credentials."],["The documentation also points to additional resources for managing service account keys, and further information on the `Credentials` factory functions."]]],[]]

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