SLIC-Reference : : GetNextAdvance  

// INT GetNextAdvance(player);
// returns the advanceDB index of the first advance from the player's AdvanceList_XXX
// that the player has not yet researched
SFN_ERROR Slic_GetNextAdvance::Call(SlicArgList *args)
{
	if (args->Count() != 1)
		return SFN_ERROR_NUM_ARGS;

	PLAYER_INDEX player;
	if(!args->GetPlayer(0, player))
		return SFN_ERROR_TYPE_ARGS;

	m_result.m_int = Diplomat::GetDiplomat(player).GetNextAdvance();
	return SFN_ERROR_OK;
}