SmokeAPI/src/koalageddon/steamclient/client_app_manager.cpp

#include <steam_impl/steam_apps.hpp>

VIRTUAL(bool) IClientAppManager_IsAppDlcInstalled(PARAMS(AppId_t app_id, AppId_t dlc_id)) {
    return steam_apps::IsDlcUnlocked(
        __func__, app_id, dlc_id, [&]() {
            GET_ORIGINAL_HOOKED_FUNCTION(IClientAppManager_IsAppDlcInstalled)

            return IClientAppManager_IsAppDlcInstalled_o(ARGS(app_id, dlc_id));
        }
    );
}