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 2025-04-09 UTC."],[[["This document provides versioned documentation for overriding authentication credentials in the C++ Memcache client library, spanning versions from 2.11.0 up to the latest release candidate 2.37.0-rc."],["The client libraries typically use Application Default Credentials for Google Cloud Services, but this can be overridden as shown by the example code."],["To override default credentials, the `UnifiedCredentialsOption` can be utilized by the user, by explicitly loading a service account key file."],["For more information on creating `google::cloud::Credentials` objects, see the Authentication Components section."],["The example code provided demonstrates loading a service account key file using `google::cloud::MakeServiceAccountCredentials`."]]],[]]
