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::policytroubleshooter_iam_v3::
PolicyTroubleshooterClient(
google::cloud::policytroubleshooter_iam_v3::
MakePolicyTroubleshooterConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["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 2025-03-14 UTC."],[[["This page provides documentation for the Policy Troubleshooter C++ client library, with versions ranging from 2.11.0 to the latest release candidate 2.37.0-rc."],["The C++ client libraries default to using Application Default Credentials for Google Cloud Service authentication, but this can be overridden."],["You can override the default authentication by utilizing the UnifiedCredentialsOption and providing credentials, such as loading a service account key file, as shown in the example code."],["Examples for other client classes like `policytroubleshooter_iam_v3::PolicyTroubleshooterClient` and `policytroubleshooter_v1::IamCheckerClient` are also available for reference."],["The \"Best practices for managing service account keys\" guide offers further information on managing credentials and the authentication components section provides more information on the available factory functions."]]],[]]
