Re: recursive map specification

[Egil H H <ehh.public@gmail.com>]

On Tuesday, June 25, 2019 at 11:09:20 AM UTC+2, mario.b...@gmail.com wrote:
> On Tuesday, June 25, 2019 at 10:44:11 AM UTC+2, Egil H H wrote:
> > On Tuesday, June 25, 2019 at 10:21:03 AM UTC+2, mario.b...@gmail.com wrote:
> > > Hello,
> > > 
> > > I want to specify a recursive map. To simplify the problem I use the example of a person and its ancestors and ancestors ... The problem does not seem special but I haven't found a solution. The approach below does not compile:
> > > 
> > > type person is record
> > >  name : unbounded_string;
> > > end record;
> > > 
> > > package tree is new ordered_maps 
> > >  (
> > >  key_type => person,
> > >  element_type => tree.map -- compiler error. "tree" undefined
> > >  );
> > > 
> > > Any ideas ? Thanks a lot !
> > 
> > 
> > Is there a reason you don't use Ada.Containers.Multiway_Trees instead?
> > 
> > 
> > -- 
> > ~egilhh
> 
> It is the first time I read about multiway_trees. Do you have a simple example ready ? Otherwise I would dig into the package docs which lack practical examples... Thanks


Sorry, I haven't used that package myself, but there's some additional explanation and example in the Rationale, http://www.ada-auth.org/standards/12rat/html/Rat12-8-4.html


-- 
~egilhh