import ( "github.com/cloudfoundry/cli/cf/requirements" ) func someCommand() { reqFactory := requirements.NewFactory() loginReq := reqFactory.NewLoginRequirement() err := loginReq.Execute() if err != nil { // handle error } // continue with command execution }In this example, we create a new requirements factory and use it to create a new instance of the LoginRequirement struct. We then execute the requirement using the Execute() method, which returns an error if the user is not logged in. This package library is used by the Cloud Foundry CLI to enforce certain preconditions before executing a command. Other examples of requirements in this package include OrgRequirement (checks if the user has an active org), SpaceRequirement (checks if the user has an active space), and TargetedSpaceRequirement (checks if the user has a targeted space).