How to Override the Default Universe Domain
In some cases, you may need to override the default universe domain used by the client library. Use AddUniverseDomainOption when initializing the client library to change this default.
For example, this will override the default universe domain for securesourcemanager_v1::SecureSourceManagerClient:
google::cloud::Options options;
// AddUniverseDomainOption interrogates the UnifiedCredentialsOption, if set,
// in the provided Options for the Universe Domain associated with the
// credentials and adds it to the set of Options.
// If no UnifiedCredentialsOption is set, GoogleDefaultCredentials are used.
auto ud_options = google::cloud::AddUniverseDomainOption(std::move(options));
if (!ud_options.ok()) throw std::move(ud_options).status();
auto ud_client =
google::cloud::securesourcemanager_v1::SecureSourceManagerClient(
google::cloud::securesourcemanager_v1::
MakeSecureSourceManagerConnection(*ud_options));