[Freeciv-Dev] Re: (PR#2464) patch: restrict techs by nation

["aas02101@xxxxxxxxxxxxxxxxxx via RT" <rt@xxxxxxxxxxxxxx>]

Quoting Raimar Falke via RT <rt@xxxxxxxxxxxxxx>:

> On Thu, Dec 12, 2002 at 07:44:22AM -0800, Gregory Berkolaiko via RT wrote:
> > 
> > Sorry if I gatecrush the discussion without really understandiing who 
> > proposes what, but I thought that it'd be simpler to have, instead of 
> > nation_req, a root_req.
> > 
> > This root_req would be the tech (like Fire of Morgoth) which sits in the 
> > origin of one of the separate trees.  Knowledge of this root_tech would be
> 
> > required not only for the research but also for the transfer by theft or 
> > gift or conquest.  Effectively Per's function is_tech_available (which I 
> > would rename into is_tech_accessible) will check not for the name or ID of
> 
> > the player, but whether player has the root_req of this tech.
> > 
> > Then, for example, Uruk-Hai tech would have
> > req1 = Genetical Engineering
> > req2 = Stem Cells
> > root_req = Fire of Morgoth
> > 
> > The advantage is that if you want to add another nation which has access 
> > to a tech tree, you don't have to add the nation name to each tech.  Just
> 
> > give the nation Fire of Morgoth, that's all.
> > 
> > Obviously the root tech has to have itself as a root_req, so it is not 
> > transferable in the first place.  So Fire of Morgoth will be
> > req1 = Fire of Morgoth  /* Non-researchable */
> > req2 = 
> > root_req = Fire of Morgoth  /* Non-transferable */
> 
> Also nice. But do you plan to stick this root_req to every tech which
> needs it? IMHO Fire of Morgoth should be required by Genetical
> Engineering or Stem Cells directly or directly as a normal
> requirement. If this is so it is IMHO superfluous to specify Fire of
> Morgoth as a root_req for Uruk-Hai. If this isn't the case Fire of
> Morgoth is not more than a flag. A nice flag which can be set by
> initial_tech but a flag nonetheless.

It can either be explicitly put into each tech or can be marked once as a root
tech and then the tech file parsing function would have to do the work.

G.