Conditional behavior based upon auth

Question

Imagine a contract that does not require_auth() but instead has conditional behavior depending upon which auth is present.

if (<conditional that checks auth>) {
  // do stuff given auth from account A
} else {
  // do stuff given any other auth
}

What is an example of the conditional that checks auth?

Answer 1

An example: has_auth(accountname)

See: https://eosio.github.io/eosio.cdt/1.5.0/group__action.html#function-hasauth