rem: void ECA_ENGINE::command(Engine_command_t cmd, double arg) { impl_repp->command_queue_rep.push_back(static_cast<int>(cmd),arg);
add: void ECA_ENGINE::command(Engine_command_t cmd, double arg) { command_queue_rep.push_back(static_cast<int>(cmd),arg);
context: void ECA_ENGINE::command(Engine_command_t cmd, double arg){  impl_repp->command_queue_rep.push_back(static_cast<int>(cmd),arg);}