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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::managedidentities_v1::ManagedIdentitiesServiceClient( google::cloud::managedidentities_v1:: MakeManagedIdentitiesServiceConnection(options)); }
[[["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 overriding default authentication credentials when using Google Cloud client libraries, specifically focusing on C++."],["The latest release candidate version available is 2.37.0-rc, and the current version of the documentation is for version 2.36.0, alongside links to historical versions down to version 2.11.0."],["Client libraries default to using Application Default Credentials for authentication, but you can override this with the UnifiedCredentialsOption."],["The documentation demonstrates loading a service account key file to override authentication as an example of modifying the default credentials."],["For further information, users can explore the Authentication Components section, which explains how to create `google::cloud::Credentials` objects."]]],[]]