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::advisorynotifications_v1::
AdvisoryNotificationsServiceClient(
google::cloud::advisorynotifications_v1::
MakeAdvisoryNotificationsServiceConnection(options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page lists the available versions of the C++ Advisory Notifications client library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation explains how to override the default Application Default Credentials (ADC) for authentication with Google Cloud Services.\u003c/p\u003e\n"],["\u003cp\u003eUsers can override authentication by utilizing the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e to explicitly load a service account key file, as demonstrated in the provided example.\u003c/p\u003e\n"],["\u003cp\u003eThe example code provided shows how to use \u003ccode\u003eMakeServiceAccountCredentials\u003c/code\u003e to create a \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e using the contents of a service account key file, and a link to best practices is provided for this.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation references additional resources such as the Authentication Components page, which details factory functions for generating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects.\u003c/p\u003e\n"]]],[],null,[]]
