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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::memcache_v1::CloudMemcacheClient( google::cloud::memcache_v1::MakeCloudMemcacheConnection(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 2025-03-21 UTC."],[[["The latest version available is 2.37.0-rc, with numerous prior versions available down to 2.11.0."],["Client libraries typically use Application Default Credentials for authentication with Google Cloud Services, but these defaults can be overridden."],["Authentication can be overridden by providing the UnifiedCredentialsOption, as demonstrated by explicitly loading a service account key file."],["The provided example illustrates overriding authentication by loading a service account key file, but users should refer to the best practices guide for more details on service account key management."],["For further information on creating `google::cloud::Credentials` objects, refer to the Authentication Components documentation."]]],[]]
