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Showing content from https://cloud.google.com/cpp/docs/reference/bigtable/2.26.0/bigtable-auth-example below:

C++ Client Libraries | Google Cloud

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Override the authentication configuration

Some applications cannot use the default authentication mechanism (known as Application Default Credentials). You can override this default using google::cloud::UnifiedCredentialsOption. The following example shows how to explicitly load a service account key file.

  namespace bigtable = ::google::cloud::bigtable;
  [](std::string const& project_id, std::string const& instance_id,
     std::string const& table_id, std::string const& keyfile) {
    auto is = std::ifstream(keyfile);
    is.exceptions(std::ios::badbit);
    auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto options =
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            google::cloud::MakeServiceAccountCredentials(contents));
    auto resource = bigtable::TableResource(project_id, instance_id, table_id);
    return bigtable::Table(bigtable::MakeDataConnection(options), resource);
  }

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.

Changing the default authentication configuration for other *Client classes is very similar, as shown in these examples:

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.

See Also

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 access to documentation for various versions of the C++ Bigtable client library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["The content details how to override the default authentication mechanism using `google::cloud::UnifiedCredentialsOption`, which allows applications to use custom authentication methods instead of relying solely on Application Default Credentials."],["An example is given that specifically demonstrates loading a service account key file to override the default credentials, which can be done using the `MakeServiceAccountCredentials` function."],["The ability to change the default configuration is not limited to `bigtable::Table` as similar configurations are available for other clients, including `BigtableTableAdminClient` and `InstanceTableAdminClient`."],["For additional information, the page references the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" documentation, detailing the factory functions to create `google::cloud::Credentials` objects."]]],[]]

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